"X" Pipe - What's the Purpose??
11-14-2010, 12:21 PM
#1
Safety Car
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"X" Pipe - What's the Purpose??
I read somewhere that the 2009 and latter LS3s have an "X" pipe in their dual exhaust where earlier model C6s didn't. Is this true, and if so why the change? Just curious.
11-14-2010, 12:44 PM
#3
Le Mans Master
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St. Jude Donor '12
X pipe was on ZR1 first. It did NOT appear on a 2010 except ZR1.....2011 it became standard on Z06 and ZR1. It is NOT on anything else to my knowledge. H pipe are on Z06's previous ''11....(2010 and before). My '10 Z06 is H pipe....flow is different and produces slightly different tones vs X pipe.
11-14-2010, 01:07 PM
#5
Le Mans Master
A) The cross plane crank in the LS3 (all american V8s and most V8s from the rest of the world) have an uneven cylinder firinig order at the banks. This is what gives the burble at idle. A cross plane crank emits exhaust gasses into the header in a LRLLRLRR pattern. Thus, the left and right sides of the tail pipe see two small exhaust pulses and one large exhaust pulse at somewhat uneven timing intervals. {A racing V8 has an LRLRLRLR exhaust pattern.}
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
11-14-2010, 01:55 PM
#6
Safety Car
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A) The cross plane crank in the LS3 (all american V8s and most V8s from the rest of the world) have an uneven cylinder firinig order at the banks. This is what gives the burble at idle. A cross plane crank emits exhaust gasses into the header in a LRLLRLRR pattern. Thus, the left and right sides of the tail pipe see two small exhaust pulses and one large exhaust pulse at somewhat uneven timing intervals. {A racing V8 has an LRLRLRLR exhaust pattern.}
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
11-14-2010, 02:06 PM
#7
Racer
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The X pipe started on the 08 Corvette. Suposed to create better balance of exhaust flow from side to side over H pipe. When I did my NPP on my 05 I also used the X pipe from the system. Could be in my head but car seems to run a little better than with the H pipe. 
11-14-2010, 02:37 PM
#8
Burning Brakes
Well while we are on the topic, I have boiled down my exhaust to either a Borla Stinger or Corsa Sport. I think I like the exhaust a little better from the Borla. Would it be better to go with an X pipe as well with whichever I finally choose? And in you guys experience,which performs better and which looks better? Is ease of installation better on one than the other. Prices seem to be about comparable . Any and all comments would be appreciated. Thanks to all on this forum. You guys have alredy solved some of my concerns and saved me money recommending certain vendors and sponsors.
11-14-2010, 03:18 PM
#9
A) The cross plane crank in the LS3 (all american V8s and most V8s from the rest of the world) have an uneven cylinder firinig order at the banks. This is what gives the burble at idle. A cross plane crank emits exhaust gasses into the header in a LRLLRLRR pattern. Thus, the left and right sides of the tail pipe see two small exhaust pulses and one large exhaust pulse at somewhat uneven timing intervals. {A racing V8 has an LRLRLRLR exhaust pattern.}
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
B) The H-pipe and X-pipe are there to allow the double LL or RR to use both sides of the exhaust and this smooths out the power curve. Everything after the X-pipe sees the same pulse pattern (i.e. smooth).
C) an H-pipe is merely an inefficient X-pipe.
D) The reason for the cross plane crank is freedom from vibrations. The detriment to the cross plane crank is uneven breathing intervals per bank on the intake and exhaust.
E) The reason for the flat plane crank is the ability to tap into even intake and exhaust breathing cycles per bank to utilize the resonances for higher power levels.
11-14-2010, 04:49 PM
#10
Tech Contributor
eddie
11-14-2010, 05:20 PM
#12
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Are you sure about that? Staring in 08 the LS3's got an X-pipe. I would be quite shocked if yours actually had an H-pipe.
11-14-2010, 05:28 PM
#13
Burning Brakes
Regards,
GSRANDY
11-14-2010, 05:50 PM
#14
Tech Contributor
It's hard to see but I think there may be an X-pipe there. I will get a better look the next time I get it up in the air.
OK, here is a photo. Is this the X-pipe?
Last edited by ncvette_1FUNRIDE; 11-14-2010 at 06:57 PM.
11-14-2010, 06:02 PM
#15
Drifting
If you are thinking of headers and get a hood pair that addresses this upstream, no x needed on the exhaust...right?
11-14-2010, 07:05 PM
#16
Team Owner
