Exhaust Piping Size?

JonnyH · 01-09-2009, 12:48 AM

Hey Guys,

Does anyone know what piping size should be used for a aftermarket exhaust? I plan on going custom straight pipes. I'm not to familiar with NA/RWD exhaust piping coming from Turbo/AWD.

Thank!

-Jonny

RCZ · 01-09-2009, 12:39 PM

Haha, great question. If I were doing this I'd go with 3" all the way back....

JonnyH · 01-09-2009, 03:55 PM

Yeah I was thinking 3" all the way too. Thanks!

shumby · 01-09-2009, 05:13 PM

#" will be good but we need cobb or some one to get a tune out for this as we will gain HP but we are going to loose TQ this way.

Skaterbasist · 01-12-2009, 09:31 PM

Why would you do a 3" exhaust on a naturally aspirated VQ engine? I can guarantee you that gains will be non-existent. The only time I have ever seen any G/Z use such a large diameter piping is when they are going turbo'd.

Stick to 2.5".

Crash · 01-13-2009, 01:14 AM

^^^ +1 Exactly!

The car doesn't have enough torque as it is... The motor is likely already flowing exhaust as best it can as is... The same amount of air is going to flow out 3" as it would flow out a 2.5". And with 3" you lose torque because you're losing back-pressure. The only time you need to open up the exhaust is when you have MORE air coming in than can flow out at equal volume.

JonnyH · 01-13-2009, 08:19 PM

Quote:

Originally Posted by Crash

^^^ +1 Exactly!

The car doesn't have enough torque as it is... The motor is likely already flowing exhaust as best it can as is... The same amount of air is going to flow out 3" as it would flow out a 2.5". And with 3" you lose torque because you're losing back-pressure. The only time you need to open up the exhaust is when you have MORE air coming in than can flow out at equal volume.

Thanks for the advice. As I stated I'm coming from a turbo awd car and don't really know much about exhaust size for N/A haha.

Crash · 01-14-2009, 01:57 PM

NP. You may WANT to turbo the Z later. The VQ37 is going to LOVE boost.

01-09-2009, 12:48 AM	#1 (permalink)
JonnyH Base Member Join Date: Jan 2009 Location: Orange County Posts: 10 Drives: 2006 WW Evo 9 MR Rep Power: 16	Exhaust Piping Size? Hey Guys, Does anyone know what piping size should be used for a aftermarket exhaust? I plan on going custom straight pipes. I'm not to familiar with NA/RWD exhaust piping coming from Turbo/AWD. Thank! -Jonny

01-09-2009, 05:13 PM	#4 (permalink)
shumby Captin Canuck Join Date: Dec 2008 Location: with your mom Age: 44 Posts: 6,288 Drives: your sister Rep Power: 236	#" will be good but we need cobb or some one to get a tune out for this as we will gain HP but we are going to loose TQ this way. __________________ Originally Posted by SAM@GTM Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living . Sam

01-13-2009, 01:14 AM	#6 (permalink)
Crash A True Z Fanatic Join Date: Dec 2008 Location: Los Angeles Posts: 1,853 Drives: 02 Corvette Z06 Rep Power: 589	^^^ +1 Exactly! The car doesn't have enough torque as it is... The motor is likely already flowing exhaust as best it can as is... The same amount of air is going to flow out 3" as it would flow out a 2.5". And with 3" you lose torque because you're losing back-pressure. The only time you need to open up the exhaust is when you have MORE air coming in than can flow out at equal volume. __________________ 2002 Corvette Z06 - Totaled 2003 Corvette Z06 50th Anniversary

01-14-2009, 01:57 PM	#8 (permalink)
Crash A True Z Fanatic Join Date: Dec 2008 Location: Los Angeles Posts: 1,853 Drives: 02 Corvette Z06 Rep Power: 589	NP. You may WANT to turbo the Z later. The VQ37 is going to LOVE boost. __________________ 2002 Corvette Z06 - Totaled 2003 Corvette Z06 50th Anniversary

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01-09-2009, 12:39 PM	#2 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	Haha, great question. If I were doing this I'd go with 3" all the way back....

01-09-2009, 03:55 PM	#3 (permalink)
JonnyH Base Member Join Date: Jan 2009 Location: Orange County Posts: 10 Drives: 2006 WW Evo 9 MR Rep Power: 16	Yeah I was thinking 3" all the way too. Thanks!

01-12-2009, 09:31 PM	#5 (permalink)
Skaterbasist Base Member Join Date: Dec 2008 Location: SoCal Posts: 99 Drives: 06 G35 Coupe 6MT Rep Power: 267	Why would you do a 3" exhaust on a naturally aspirated VQ engine? I can guarantee you that gains will be non-existent. The only time I have ever seen any G/Z use such a large diameter piping is when they are going turbo'd. Stick to 2.5".