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Install425's Avatar
 
Join Date: Jan 2004
Location: Fort Lauderdale
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Exhaust Mod E-cutout

When I first got my exhaust it only had a single out pipe.



But my bumper had dual cut outs ( 965 style) so I had a fake pipe welded on.



Then after a while I thought it be nice to open up the fake side. Well I did and it was nice but to loud sometimes. Like driving through the neighborhood at night. So I found this valve called a E-CUTOUT ( http://www.dmhperformance.com/ecutout.htm ). This is the coolest thing ever.















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Rob,
88 911 Turbo
Old 11-05-2006, 05:41 AM
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wow thats funny...

a month or two ago i posted on the 911 tech forum about fabricating something like that for my twin exhaust. So at the flick of a switch i could have it noisy or quiet.

People however said that it'd mess with the mixture... how do u find it?
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Old 11-05-2006, 03:06 PM
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Seems to run about the same open or shut. Pops more with it open on decelerating. I think it just that I can hear it more. Sounds and works really good.
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88 911 Turbo

Last edited by Install425; 11-05-2006 at 04:28 PM..
Old 11-05-2006, 04:25 PM
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Crotchety Old Bastard
 
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Can you wire it so that it opens automatically on boost?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-05-2006, 06:48 PM
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Quote:
Originally posted by Install425
Seems to run about the same open or shut. Pops more with it open on decelerating. I think it just that I can hear it more. Sounds and works really good.
Well, by adding the second pipe on the right, you have in effect shortened the muffler. This results in a leaner mixture, which could be causing the popping on decel.

Well... just wait for someone who know's what they're talking about to reply. Maybe should've posted in the 911 Technical Forum.

Adam
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Last edited by StayGold808; 11-05-2006 at 07:06 PM..
Old 11-05-2006, 06:58 PM
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One thing that is strange, with the valve open exhaust coming out of the right side seems to be cold and left side is always hot. I'm a little confused with this. Anyone have a explanation.
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88 911 Turbo

Last edited by Install425; 11-06-2006 at 04:00 AM..
Old 11-06-2006, 03:54 AM
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wow very cool maybe we should offer that as an option on our mufflers
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Old 11-06-2006, 06:15 AM
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Very nicely done. Clean install!
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Old 11-07-2006, 04:29 PM
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Quote:
Originally posted by RarlyL8
Can you wire it so that it opens automatically on boost?

There is a company called ATP (www.vwturbo.com) that sells a similar exhaust bypass valve that is controlled via boost. They call it their VES valve Works very well for what it is. Hook up a simple vacuum shutoff valve if you want to disable it at anytime....or just retrofit the above model with a wastegate actuator...or just adapt an adjustable hobbs boost switch to the above model. Lots of boost-controlled options
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Old 11-07-2006, 06:23 PM
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Quote:
Originally posted by Install425
One thing that is strange, with the valve open exhaust coming out of the right side seems to be cold and left side is always hot. I'm a little confused with this. Anyone have a explanation.
I would guess it's the pressure drop across the valve that makes it cooler.

Pretty neat valve though.

When you go EFI, maybe you can add some fuel when the valve is open.
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Old 11-08-2006, 04:38 AM
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The electric controlled valve is WAY Cool! I can see spending the $ for that item on my muffler!
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Old 11-12-2006, 04:37 PM
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