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Author Topic: D+D Exhaust for EFI Enfields  (Read 6929 times)

72westie

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D+D Exhaust for EFI Enfields
« on: August 21, 2012, 09:15:42 PM »
I just received a e-mail from D+D Exhaust about their new system's for Royal Enfield 500 EFI's. They offer Slip-ons and full systems. Slip-ons are either straight or up-swept for $165.00. Full systems are available in either chrome or matte black and are $358.00. 

They list dyno graphs also. Send me a message if you are interested, I am a D+D dealer and can get one coming your way.

Adam

« Last Edit: August 21, 2012, 09:21:38 PM by 72westie »
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rav

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Re: D+D Exhaust for EFI Enfields
« Reply #1 on: August 21, 2012, 10:10:38 PM »
The width seems bigger, is that so? Looks awesome though, a video clip of the exhaust would be really appreciated.

72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #2 on: August 21, 2012, 10:34:51 PM »
I just got home from work, I will check their info in the morning. If their info doesn't state a size, I will give them a call. I will also get the dyno graphs up for you guys.

The full system also comes with a 'Air Filter Power Kit' already figured in with its price. I don't know if I can get a sound clip of video though, but I will see what I can do. I noticed that they are still using the O2 sensor, so no power commander should be needed.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

The_Rigger

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Re: D+D Exhaust for EFI Enfields
« Reply #3 on: August 21, 2012, 10:36:50 PM »
I'd like to see a photo of the upswept model; it doesn't appear on the D+D website yet.
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Re: D+D Exhaust for EFI Enfields
« Reply #4 on: August 21, 2012, 10:58:55 PM »
Is it just a strainght through glasspack?  It looks just like the EMGO reverse cone I have on now but that one is turning yellow and sounds just like stock except for a decel backfire here and there.  More details please :)

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #5 on: August 22, 2012, 03:17:30 AM »
It must be my eyeballs failing me.
The upper part of the exhaust header looks like it is a 1 7/8" or even a 2" diameter pipe?

I'm guessing at the size but it looks a lot bigger than the 1 3/4" pipe on my G5.
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Re: D+D Exhaust for EFI Enfields
« Reply #6 on: August 22, 2012, 05:05:41 AM »
Looks good, I'm very interested in some details. Nice to see a little aftermarket support.
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Re: D+D Exhaust for EFI Enfields
« Reply #7 on: August 22, 2012, 08:01:26 AM »
Very impressive looking. I don't need another exhaust but this one might end up being #4 in my collection after my OEM, Silman short-bottle (excellent but a bit noisy) and Harley (good balance of sound and flow) exhausts!
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72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #8 on: August 22, 2012, 01:48:03 PM »
I will give them a call around lunch time and get more info: pipe size, muffler baffling.

Here are their dyno graphs, the Slip-on muffler graph is shown as having a air-box mod to it, not sure if its a removal or a Uni-filter. The full system graph is shown with the air box removed and a Uni-filter installed.

The first graph is the full system. The BLACK line is the full system and the RED line is a stock machine.

The second graph is the slip-on upswept pipe. The BLACK line is with the pipe, the RED line is a stock machine.

The third picture is the up-swept slip-on.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

BRADEY

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Re: D+D Exhaust for EFI Enfields
« Reply #9 on: August 22, 2012, 03:26:11 PM »
Yup its all very good to show big differences in Graphs, but I am hoping that the exhaust shines in the real world as well !

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Re: D+D Exhaust for EFI Enfields
« Reply #10 on: August 22, 2012, 04:00:04 PM »
Thats about a 10% gain in RWHP. Very impressive.

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Re: D+D Exhaust for EFI Enfields
« Reply #11 on: August 22, 2012, 04:44:48 PM »
I might be the guinea pig on this...I've been itching to do something different w/ my exhaust since i got the bike in May, but haven't pulled the trigger on anything yet.

72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #12 on: August 22, 2012, 05:05:38 PM »
Just got off the phone with D+D. Their engineer who made the pipe is going to call me back hopefully today with the specs. These were just finalized in R+D a day or two ago.

D+D normally makes the pipes as ordered, with none in stock ready to go. The lady said a 2-3 week ship time would be expected from day of order. I will post more info when the engineer calls me.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

motorat

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Re: D+D Exhaust for EFI Enfields
« Reply #13 on: August 22, 2012, 05:07:32 PM »
i want this but don't have the $358 handy.
i'll have to get scheduled for a few extra classes to pay for it.
Joe
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Re: D+D Exhaust for EFI Enfields
« Reply #14 on: August 22, 2012, 05:17:31 PM »
When you speak to him, please ask if the performance of a straight slip on is about the same as the upswept.  I'd like to do a slip on but not a full system.  And we need video!  Gotta hear the beastie!

Scott

72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #15 on: August 22, 2012, 05:35:14 PM »
Just got off the phone with him, I didn't see your post quick enough Scotty, so I wasn't able to ask that question.

The pipe is a stepped head pipe, 1 5/8 out of the head to 1 3/4. They have a 2 1/4 full length heat shield back to the muffler, that is what gives the head pipe that big look. He said they tried a bunch of different sizes and this was the best set-up.

The muffler has a long louvered baffle in it. There is no packing on it, you can put packing on it and it doesn't change the sound very much.

They had a local customer loan them his C5 to do the R+D on it. He was having a hard time hitting 70mph on the freeway, now he is hitting 75mph no problem.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

ace.cafe

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Re: D+D Exhaust for EFI Enfields
« Reply #16 on: August 22, 2012, 07:23:58 PM »
Does this use the O2 sensor, or what?
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72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #17 on: August 22, 2012, 09:06:01 PM »
The pictures show the wire from the O2 sensor hanging there, but I forgot to ask specifically if it does use it.
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2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

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Re: D+D Exhaust for EFI Enfields
« Reply #18 on: August 23, 2012, 02:19:47 PM »
I was curious about the 02 sensor as well.

BRADEY

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Re: D+D Exhaust for EFI Enfields
« Reply #19 on: August 23, 2012, 04:53:51 PM »
Nothing against the D+D exhaust sytems personally, but my C5 can hit 144 KPH /90MPH on the OEM stock torpedo. Take into account 10% error on the clocks, it is still 80MPH. I can easly cruise 70MPH all day long. I cannot comment on how much quicker D+D would hit those speeds though :)
I would be interested in more real world data.

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Re: D+D Exhaust for EFI Enfields
« Reply #20 on: August 23, 2012, 05:38:15 PM »
+1.  I can hit 85mph on the clock on my dead stock C5, 70 is a piece of cake.  That said, I love the look of reverse cone mufflers so this still gets my interest.

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #21 on: August 23, 2012, 06:19:56 PM »
I agree on the C5 top speeds, I think 85 on a stocker isn't a problem. It may be maxed out but it can do it. Bradey hit it on the head though, it may change how quickly you can get to the 85. Reguardless I agree with Scotty, I like the look and am still interested, especially in the blacked out unit. If I can put that slip-on on my pipe from Hitchcock's I'll seriously consider it. The first day I rode after taping my pipe the efi muffler from Hitchcocks started turning colors.
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Re: D+D Exhaust for EFI Enfields
« Reply #22 on: August 23, 2012, 06:29:36 PM »
My EMGO reverse cone is turning yellow in spots.  At first I thought it was just because I didn't clean off my grubby paw prints before I ran the bike but now I can see that the yellow spots are aligned with the internal baffles.  I think any muffler that runs gases next to the outer shell is going to turn color.  These bikes just run lean and spit hot gasses.  This is why I'm thinking of ceramic coating whatever system I end up with black.

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #23 on: August 23, 2012, 10:53:22 PM »
Hey mate... Guessing you are in the US.

Would shipping to Australia be prohibitively expensive?

72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #24 on: August 31, 2012, 03:11:32 PM »
Sorry for the delay. They do use the stock O2 sensor and EFI systems.

 :D
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2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
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Re: D+D Exhaust for EFI Enfields
« Reply #25 on: August 31, 2012, 04:29:24 PM »
80MPH. I can easly cruise 70MPH all day long.

Why am I still messing around with this slow-jam AVL engine?  I coulda sworn I was doing at least 70 on the highway but my chase-car informed me I was only kissing a low 60.

Exhausts looks cool Westie.  That's an impressive gain.  Bet they sound fantastic.
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ace.cafe

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Re: D+D Exhaust for EFI Enfields
« Reply #26 on: August 31, 2012, 04:50:53 PM »
Sorry for the delay. They do use the stock O2 sensor and EFI systems.

 :D

Cool!
Thanks. That's what I was hoping for.
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72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #27 on: August 31, 2012, 05:33:04 PM »
I will go double check today, but I think the rev-limiter kicks in at 5K on a stock 2010 C5 and its only pulling 77 MPH on a dyno with no wind resistance at that RPM. Unless you have a big C/S sprocket, I think you speedometer is very optimistic.  ;)

If you were to by-pass the rev limiter, it still has some speed left I think.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

barenekd

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Re: D+D Exhaust for EFI Enfields
« Reply #28 on: August 31, 2012, 06:36:37 PM »
Quote
I will go double check today, but I think the rev-limiter kicks in at 5K on a stock 2010 C5 and its only pulling 77 MPH on a dyno

My G5 rev limiter kicks in at 5900 on a dyno, about 92 MPH with a 17T sprocket. My bike will quit at about 84 in the real world though, not by rev limiter, more like horsepower limiter.
A C5 at 5000 RPM should still be doing about 82. What tires do you have?
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« Last Edit: August 31, 2012, 06:40:21 PM by barenekd »
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Re: D+D Exhaust for EFI Enfields
« Reply #29 on: August 31, 2012, 06:39:31 PM »
It can't kick in at 77.  My speedo reads 85mph when topped out in fifth gear, I'm not hitting the rev limiter and my speedo can't be that optimistic.

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #30 on: August 31, 2012, 07:38:04 PM »
I'll tell you that the faster I go the further off my (AVL) speedo is and it's definitely off by 10 by the time I hit 60 indicated.  I've seen it hit 80 and there is no way in hell I was doing more than 65.  I'm pretty sure the Enfield speedos only measure how fast it FEELS like you are going.  Nifty tech.
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Ducati Scotty

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Re: D+D Exhaust for EFI Enfields
« Reply #31 on: August 31, 2012, 07:41:30 PM »
Mine's within about 5mph near the top, so 85 was probably more like 80.

I'm pretty sure the Enfield speedos only measure how fast it FEELS like you are going.  Nifty tech.

Indeed, how do they do that?

Scott

72westie

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Re: D+D Exhaust for EFI Enfields
« Reply #32 on: August 31, 2012, 07:46:05 PM »
All stock 2010 C5. Whatever Avon tires they come with. I will go check the graph and see the MPH it topped out at.
2001 Royal Enfield Bullet 500 Race Bike:
2008 Ahrma Classic 60's #1 Plate
2009 AMA Vintage 50's #1 Plate
2010 AMA Vintage 50's #1 Plate
http://www.bgmotorcycle.com

eda1bulletc5

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Re: D+D Exhaust for EFI Enfields
« Reply #33 on: September 01, 2012, 02:16:15 AM »
Any sound clip with this new exhaust system?
Would be good to know...
Thanks!
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motorat

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Re: D+D Exhaust for EFI Enfields
« Reply #34 on: September 01, 2012, 02:37:27 AM »
sound would be great...also when are these available to order.....my time frame is about 3 months..depending on how many classes i get to teach
Joe
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Hobbydad

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Re: D+D Exhaust for EFI Enfields
« Reply #35 on: September 01, 2012, 05:31:03 AM »
I check my speedo against my GPS whenever I have a chance. At lower speeds (under 50), it's off by a solid 5 mph, but at higher speeds (over 60) it's only off by 2-3 mph dependably. I cruise at 80 on the eway all the time and can exceed that speed without coming anywhere near the rev limiter. The highest indicated that I've ever hit was 90 mph, and I believe it was within that 2-3 mph diff. My bikes a slightly modified 2011 C5 (complete Hitchcock exhaust, K&N cone, 19T, and at least a 50# diet of missing steel).



(I have since fabbed up a 750cc+ intake tube between the filter & TB, after reading Ace's comments on intake plenums in another thread.)
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Re: D+D Exhaust for EFI Enfields
« Reply #36 on: September 02, 2012, 12:56:30 PM »
(I have since fabbed up a 750cc+ intake tube between the filter & TB, after reading Ace's comments on intake plenums in another thread.)

Do you have a pic of the TB tube?
Chris

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Re: D+D Exhaust for EFI Enfields
« Reply #37 on: September 02, 2012, 04:45:49 PM »
I check my speedo against my GPS whenever I have a chance. At lower speeds (under 50), it's off by a solid 5 mph, but at higher speeds (over 60) it's only off by 2-3 mph dependably. I cruise at 80 on the eway all the time and can exceed that speed without coming anywhere near the rev limiter. The highest indicated that I've ever hit was 90 mph, and I believe it was within that 2-3 mph diff. My bikes a slightly modified 2011 C5 (complete Hitchcock exhaust, K&N cone, 19T, and at least a 50# diet of missing steel).



(I have since fabbed up a 750cc+ intake tube between the filter & TB, after reading Ace's comments on intake plenums in another thread.)
The bike looks really nice.
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Re: D+D Exhaust for EFI Enfields
« Reply #38 on: September 02, 2012, 05:47:12 PM »
Do you have a pic of the TB tube?




I know what you're thinking, "Holy Clamps!", but this was the initial mock up. All but 2 of the clamps have been removed and the pieces have been gorilla glued together. The only piece I couldn't show you was inside the airfilter itself. It's a belled conduit piece which looks exactly like a velocity stack. It was a PITA getting the belled end inside the filter and I don't think I could physically pull it out again. Everything I bought can be picked up a local hardware store. It's all been cut down, recontoured, ect., but the pieces are basic plumbing/electrical stock. The airfilter now sits on the left side, right behind the battery box. It's a full 2" from reducer to reducer, and I measured the volume it holds with water.
« Last Edit: September 02, 2012, 06:00:25 PM by Hobbydad »
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Re: D+D Exhaust for EFI Enfields
« Reply #39 on: September 02, 2012, 07:42:35 PM »
wow, and I was hoping to be able to replace the toolbox w/ a pancake filter...  hmm back to the drawing board, thanks for the parts list...  Have you noticed improvements w/ this setup?  Thanks... chris
Chris

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Re: D+D Exhaust for EFI Enfields
« Reply #40 on: September 07, 2012, 07:52:38 PM »
I ordered the straight slip-on today from D&D, they said it would be shipped out sometime late next week.
After i get it, i'll post some pictures and get a video so you guys can hear how it sounds.

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Re: D+D Exhaust for EFI Enfields
« Reply #41 on: September 07, 2012, 07:58:50 PM »
Can you please try to get a 'before' video with the stock setup for comparison?

Thanks,
Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #42 on: September 07, 2012, 09:07:00 PM »
Will do.

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Re: D+D Exhaust for EFI Enfields
« Reply #43 on: September 10, 2012, 04:25:10 AM »
Wonderful that will be very helpful!!
Thanks
Sajiv
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Re: D+D Exhaust for EFI Enfields
« Reply #44 on: September 10, 2012, 10:17:08 AM »
I, personally, think the sales success of pod filters totally depends on the perpetuation of urban legend..that they help performance based on some nebulous "figures" supplied by some word of mouth..
I have had a few bikes now that have been retrofitted with pods (not by me) and they all sucked. Not until I returned them to near stock and/or changed the carbs to something a little more modern did actual performance return to some acceptable road worthy condition..
I suppose if a very narrow band of performance is needed, as in racing and the like,  pods MAY be acceptable.. but for everyday commuter type conditions..forget it...even normally forgiving Japanese bikes are nearly impossible to get right, I can't imagine how an RE would act outside of EFI.

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Re: D+D Exhaust for EFI Enfields
« Reply #45 on: September 28, 2012, 03:51:15 AM »
I received the D&D straight slip-on a few days ago. I placed the order 15 days before it arrived at my door, they're located in TX and I'm in Wisconsin. They actually said it would ship out about a week before it did, and when I called to inquire whether it had shipped, they were very apologetic, and then it shipped out that day.  The total cost, with shipping, was $186.  The box i received included the silencer, a heat-shield, and the pod air filter they recommend adding with the new silencer, (which was supposed to be an additional $35, but for some reason they sent it along w/out charge...maybe for the delay in shipping??).
Anyway I put in on tonight, which was a pretty simple process...the biggest pain was getting the heat shield to fit over the wrap i have on my header pipe; the shield is designed to be almost touching the header pipe.
First impressions: it's definitely louder and a much deeper sound. It's actually not a whole lot louder than the stock pipe at idle, but when you get on it, it's much louder.
As far as added performance, judging from the seat of my pants, it definitely added something here too...I probably only went for a 10 mile loop.  The main difference I noticed tonight was the acceleration in 2nd and 3rd gear, (and back to the sound from the pipe, it's loud enough when you grab a handful of throttle that I'd be nervous doing that w/ a police officer around, I doubt the decibels are w/in the legal limit). 
Anyway, I'm sure I'll post again after i get a chance to go for a proper ride and really get a feel for it, and I'm still unsure whether I'm going to install the new filter...but if i do, I'll let you guys know what that does for performance.
Here's a picture of what it looks like on the bike, not a great photo, taken in my dark garage after I got home from the ride.
I also made a before and after video of how the bike sounded w/ the stock silencer and then w/ the D&D...I was alone, so that was all I could really film. Both of the videos were taken with my bike in the same spot, and shot w/ the same device, so it should be a pretty honest comparison, (i think i must have had my hand over the microphone in the first 5 seconds of the "before" video, so after that is the actual volume of the stocker). 
Before: http://www.youtube.com/watch?v=_wJHHdihXCg&feature=plcp
After: http://www.youtube.com/watch?v=UuYzUoMs0Fg&feature=plcp

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Re: D+D Exhaust for EFI Enfields
« Reply #46 on: September 28, 2012, 04:04:43 AM »
Great Job ADB and thanks, it does seem to sound a bit more deeper than the stock. 
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Re: D+D Exhaust for EFI Enfields
« Reply #47 on: September 29, 2012, 12:01:13 AM »
Thanks a lot for taking the time to upload the video, very much appreciated. When you have some time can you attach the pics of the filter setup?

Ravi

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Re: D+D Exhaust for EFI Enfields
« Reply #48 on: September 29, 2012, 09:14:50 PM »
I went out for about a 40 mile ride today, and similar thoughts on the pipe...it's loud.  I don't think it's Harley loud, but when i get on it, it's probably closer to that than the way it sounded with the stocker. It's definitely still the thumper sound..but just amplified and noticeably deeper. 
I took a few more pics today so if anyone's interested, they can get a better look at it.
Rav: I haven't even taken the air filter they sent with the pipe out of it's wrapping yet, but in case you're curious, i also took a picture of that and is attached below. 

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Re: D+D Exhaust for EFI Enfields
« Reply #49 on: September 29, 2012, 09:16:47 PM »
ok, not sure why the other pics didnt show up in the first post..

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Re: D+D Exhaust for EFI Enfields
« Reply #50 on: September 29, 2012, 09:49:22 PM »
Thanks, It really looks proportionate to the bike.

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Re: D+D Exhaust for EFI Enfields
« Reply #51 on: September 30, 2012, 07:41:19 PM »
The UNI pod filters are for an iron barrel. The K&N looks kinda small for a UCE. I can't make out if there is a mounting snout on it or not, but if there is, it's for a carburettor, too.
The pipe sounds pretty good, can't really tell if it's too loud or not.
Bare
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Re: D+D Exhaust for EFI Enfields
« Reply #52 on: September 30, 2012, 09:35:24 PM »
I apologize in advance if this has been covered elsewhere ...

Is the header pipe stainless ? or chromed ? 
If stainless, is it available separately ?
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Re: D+D Exhaust for EFI Enfields
« Reply #53 on: October 01, 2012, 01:40:17 AM »
The K&N filter ( the small one) is for the crankcase breather....
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Re: D+D Exhaust for EFI Enfields
« Reply #54 on: October 06, 2012, 01:15:26 AM »
Hi Folks,

I please need some suggestion;

Can the air filter (uni filter UP-4182) shown in the picture by ADB used by itself directly to the throttle body?

I already have a EFI style silencer/muffler and K&N filter (OEM replacement). There is sometime a backfire that happens - but nothing major.

I am thinking if I can use this Uni filter and the K&N crankcase breather filter (components shows in the picture) then the air filter box could be used as a useful storage area.

Any thoughts how this setup might work for EFI or if anyone tried it?

Thanks.
Sajiv
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Re: D+D Exhaust for EFI Enfields
« Reply #55 on: October 06, 2012, 02:02:43 AM »
If you put a pod type filter right on the throttle body the MPG is going down.  Mine went down about 20% if I recall correctly.  The bike seemed to run fine but it used a lot more fuel.  For best performance you want to add a length of tubing of some sort.  The theory we've come to is that there's too much turbulence for the manifold pressure sensor to register properly when the filter is mounted right on the throttle body. 

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #56 on: October 06, 2012, 06:51:44 AM »
this turbulence idea interests me.

IIRC  the MAP sample port is sandwiched between the throttle plate and the intake valve.  The sensor must be built to survive the acoustic shocks from the intake valve closing.  (this incoming charge that has whistled past the partially open throttle plate and is abruptly stopped by the valve closure will rebound back up the intake).

That amount of "noise" in the system would make it necessary to filter the electrical output of the MAP to smooth those thump echos and obtain a nice average value which, when used with the slowly moving TPS signal can be used in a look-up table to determine the load on the engine.

Electrical filters that can smooth the thump echo would have absorbed the relatively high pitched noise of intake turbulence......

I wonder if the improved (lively) throttle response accounts for the reduction in economy.  After all, acceleration is a huge energy waster - and - anything that will make the RPM's lighter and more responsive will by necessity require more energy.
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1981 XS11 streetfighter
1983 Venture Royale
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Re: D+D Exhaust for EFI Enfields
« Reply #57 on: October 08, 2012, 11:13:41 PM »
Of course I'm just guessing but I think the long intake length just makes for a smooth laminar airflow that moves easily thru the throttle body.

Turbulent air can easily serve to make an invisible dam, effectively blocking off much of the open area to any air that is trying to flow thru it.

There is also the issue of not having enough air in reserve, held in the filter inlet plenum or housing.
If the distance between the throttle plate and the filter doesn't have sufficient volume, the air present is rapidly reduced to a vacuum and only the limited air that can instantly pass thru the filter will be available to supplement the engines needs.

It's rather like trying to take a deep breath from a hose connected to a 50 gallon oil drum vs trying to take the same breath from a similar hose connected to a 2 liter Coke bottle with a small hole in the bottom.
Jim
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Re: D+D Exhaust for EFI Enfields
« Reply #58 on: October 08, 2012, 11:51:13 PM »
I agree, too small of a filter will act just like a "choke"
1996 Trophy 1200
2011 RE B5
1979 XS11 w/vetter terraplane
1981 XS11 streetfighter
1983 Venture Royale
1982 CB750K
1971 Triumph Trident
1969 CB450
1966 Sears (puch) 250


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Re: D+D Exhaust for EFI Enfields
« Reply #59 on: October 09, 2012, 07:05:35 AM »
It's rather like trying to take a deep breath from a hose connected to a 50 gallon oil drum vs trying to take the same breath from a similar hose connected to a 2 liter Coke bottle with a small hole in the bottom.
That's the best description I have heard yet...
Chris

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Re: D+D Exhaust for EFI Enfields
« Reply #60 on: October 11, 2012, 08:58:56 PM »
Is the sound more like a thump thump thump or putt putt putt???

I had changed the stock silencer to silman short bottle silencer; sounded more like thump but after around 5000 miles it is more like putt putt putt...especially when opening the throttle.
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Re: D+D Exhaust for EFI Enfields
« Reply #61 on: October 20, 2012, 08:13:25 AM »
I know its fairly new, but has anyone put the full black system on a black Enfield? I am wondering if that matte finish would look goofy on a (somewhat) shiny G5.

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Re: D+D Exhaust for EFI Enfields
« Reply #62 on: October 20, 2012, 04:36:33 PM »
Look through the gallery. I think there are some black ones in there.
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Re: D+D Exhaust for EFI Enfields
« Reply #63 on: October 21, 2012, 07:00:49 PM »
do you have pics of the airfliter installed.
the instructions say to remove the airbox completely.
Joe
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Re: D+D Exhaust for EFI Enfields
« Reply #64 on: October 22, 2012, 02:55:45 PM »
motorat, I dont have any pics of the airfilter installed...it's still sitting in the box in my garage. I'm assuming I'll get around to putting it on at some point, but haven't found the time in the last month.  When i do get it installed, I'll post some pictures, (i think the note in the instructions having you remove the airbox was just for ease of installation and access to the throttle body).

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Re: D+D Exhaust for EFI Enfields
« Reply #65 on: October 22, 2012, 04:03:19 PM »
Motorat, i just saw the video on the other thread of your new exhaust...looks good, and has me second guessing not getting the black. Have you installed the new airfilter?

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Re: D+D Exhaust for EFI Enfields
« Reply #66 on: October 22, 2012, 04:45:16 PM »
not yet...
i was a little confused o the instructions.
i was not sure if the air box was removed and left off or as ADB said it was removed to get access and then put back on.
Joe
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Re: D+D Exhaust for EFI Enfields
« Reply #67 on: October 22, 2012, 06:51:19 PM »
Anyone with a D&D want to really give it some gas and post a video?  I do a lot of freeway riding, wondering how loud it is at cruising speeds.  I know the EFI is loud as hell on the freeway.  Manufacturers should be required to take a recording while the bike is on the dyno, just so we can all drool :)

Thanks in advance,
Scott
« Last Edit: October 22, 2012, 06:55:22 PM by Ducati Scotty »

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Re: D+D Exhaust for EFI Enfields
« Reply #68 on: October 22, 2012, 08:45:40 PM »
EOM Manufacturers do have to run on the dynos. That's why the new bikes sound so bad. If you get right down to it, all aftermarket mufflers are illegal, at least in Cantafordia. So, it really doesn't matter whether they are quiet or not. My EFI doesn't make that much noise on the freeway, but it is louder than the bazooka. But the Hardley's still get away with ridiculous noise levels, probably 30 decibels louder than my Bullet, so I'm not going to worry about it. Cops don't usually give me a second look.
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Re: D+D Exhaust for EFI Enfields
« Reply #69 on: October 30, 2012, 08:55:14 PM »
I'm not sure if all the EFI silencers are the same!! I find loud pipes on any bike obnoxious but find my EFI perfect to my ear on the freeway or off while others find them very loud. I find the EFI right on sound and appearance wise.

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Re: D+D Exhaust for EFI Enfields
« Reply #70 on: October 30, 2012, 09:17:31 PM »
To be fair, I think the one I heard had blown out most of its packing by the time I was there.  I heard a new one start up and it was nice.  Loud but not ridiculous.

Scott

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Re: D+D Exhaust for EFI Enfields
« Reply #71 on: October 30, 2012, 10:16:32 PM »
Mine is fairly quiet. At speed, I can barely hear it over the wind noise. It's a lot quieter than the stuff Jack has been running, Goldies, Dunstalls, etc.
Mine is an Indain one. he English ones I think are a bit louder. They also have removable baffles in them that mine doesn't have. The upswept mufflers are also louder than my EFI. I like the level of noise mine puts out very well, a log way from obnoxious, but loud enough to be heard a block away at a nice low thump. It doesn't seem to disturb anybody, except maybe when I spit traffic up to a stoplight and nail it to get away when the light turns green. It's maybe a bit loud in that canyon! But still a LONG way from any Hardley. For me, it's perfect. And is a reasonably good performer compared the other pipes I've ridden against. There isn't much difference between any of them, but  this one is middle of the pack or better.  Works for me, nice thump that performs well. the best performing one I've seen is the Dunstall, but unpacked it's pretty loud. Put packing in it and it's about the same as mine.
But there isn't enough difference between them to get in a big battle over. they all do outperform the stock bazooka, though.
Bare
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