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06-12-2009, 02:49 PM
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#1
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LSwhatever
Join Date: Nov 2007
Location: Belcamp, MD
Posts: 278
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Took my TD's X pipe off
and got me the GMMG. It sounds great but now I have an exhaust backfire when I'm decelerating or at idle during a stop. I know the backfire is due to the unspent gas in the exhaust burning off. But is the backfire occurring because the GMMG system is more restrictive?
__________________
-Felipe
2001 WS6: SDPC LS7 Shortblock, L92 heads upgraded for .600 lift,
L76 intake, Nick Williams TB, Comp Cams 224/228 .581/.588 114+2LSA,
1 7/8 LT's, GMMG
waiting for some boost
2003 Silverado 1500HD
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06-12-2009, 03:33 PM
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#2
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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Y pipe now right?
If so, thats prob why.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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06-12-2009, 08:19 PM
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#3
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11 Second Club
Join Date: Aug 2008
Location: Hagerstown, MD
Posts: 1,566
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the y-pipe is not as free flowing as the x-pipe obviously, and the direction of the exhaust running into each other and in a sense "slamming" into each other and not being able to flow out fast enough.
__________________
J E R S E Y S H O R E O W N S Y O U
12 Sonic Turbo
07 Malibu SS
04 Silverado SS - Sold 
00 Trans Am WS6 - Sold
-.:: United States Marine Corps ::.-
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06-12-2009, 08:41 PM
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#4
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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Your X pipe does not play well with others.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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06-13-2009, 06:03 AM
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#5
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11 Second Club / I <3 LT1s
Join Date: May 2008
Location: Troy, Mi
Posts: 2,642
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Quote:
Originally Posted by 7pointoh
and got me the GMMG. It sounds great but now I have an exhaust backfire when I'm decelerating or at idle during a stop. I know the backfire is due to the unspent gas in the exhaust burning off. But is the backfire occurring because the GMMG system is more restrictive?
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make sure u go over every exhaust connection. I had an exhuast backfire forever until last week when I fixed an exhaust leak I had. Every since then, the backfiring went away.
__________________
Vinnie -
00 SS A4- LQ9/LS3/Stalled/3.42s 1.48/11.10/121 mph<-6spd swap in progress.
13 Silverado Z71- Sold 11/16
99 Z28 M6- -H/C/9in - sold 1/13
99 Silverado Z71- The DD - Sold 7/13
03 CBR 600RR - Sold 8/13
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06-13-2009, 09:57 AM
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#6
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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hahaha true john.
yo vin does your cut out leak at the valve at all?
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06-13-2009, 12:02 PM
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#7
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11 Second Club / I <3 LT1s
Join Date: May 2008
Location: Troy, Mi
Posts: 2,642
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Quote:
Originally Posted by sweetbmxrider
hahaha true john.
yo vin does your cut out leak at the valve at all?
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I don't think it does..I've actually never put my hand in front of it with it closed. You can hear the motor close the valve pretty tightly so I really don't think it leaks any.
__________________
Vinnie -
00 SS A4- LQ9/LS3/Stalled/3.42s 1.48/11.10/121 mph<-6spd swap in progress.
13 Silverado Z71- Sold 11/16
99 Z28 M6- -H/C/9in - sold 1/13
99 Silverado Z71- The DD - Sold 7/13
03 CBR 600RR - Sold 8/13
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06-13-2009, 02:07 PM
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#8
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11 Second Club
Join Date: Aug 2008
Location: Hagerstown, MD
Posts: 1,566
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mine does not leak.
__________________
J E R S E Y S H O R E O W N S Y O U
12 Sonic Turbo
07 Malibu SS
04 Silverado SS - Sold
00 Trans Am WS6 - Sold
-.:: United States Marine Corps ::.-
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06-13-2009, 02:52 PM
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#9
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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hmmm i gotta check mine out then
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06-15-2009, 07:37 AM
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#10
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LSwhatever
Join Date: Nov 2007
Location: Belcamp, MD
Posts: 278
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Here's the thing. I use to run the stock Y with cats and no problem. The weirder thing is, I drove the car today and it hasn't backfired yet.
__________________
-Felipe
2001 WS6: SDPC LS7 Shortblock, L92 heads upgraded for .600 lift,
L76 intake, Nick Williams TB, Comp Cams 224/228 .581/.588 114+2LSA,
1 7/8 LT's, GMMG
waiting for some boost
2003 Silverado 1500HD
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06-15-2009, 08:02 AM
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#11
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,212
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My car with the stock tune had a little bit of pop to it once in a while decelerating. GMMG is definitely not one of the better flowing cat-backs(chambered pipes do not flow very well) but it sounds good and is stainless which is nice. Maybe your computer is making adjustments after you've driven it around a bit. A more restrictive exhaust would not pull raw fuel into the exhaust stream like a freer flowing exhaust will so that wouldn't cause the popping.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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