2.5 or 3" exhaust piping for 600HP
Thread Starter
|
Registered User
Joined: Oct 2006
Posts: 2,040
From: Seattle
Rep Power: 130
2.5 or 3" exhaust piping for 600HP
I am planning to do a custom exhaust like Craigs (no cats, w/resonators). My goal in a few months is to have the K24/18G Protomotive package and be pushing a little over 600hp. My thoughts are that 2.5" piping will be fine at this point? Am I correct or will going to 3" be beneficial? The outlets of the stock turbo are 3".
Will there be a big sound difference between 2.5" and 3"? I noticed most all aftermarket systems are 2.5"
Will there be a big sound difference between 2.5" and 3"? I noticed most all aftermarket systems are 2.5"
Registered User
Joined: Feb 2004
Posts: 4,880
From: In a Canyon - Really :)
Rep Power: 290
The bigger the better on a Turbo car. Yo may lose a bit of pre-turbo torque, but will breather much better under boost.
My Remus Exhaust comes with 3.15" piping (80mm) in Euro Spec.
My Remus Exhaust comes with 3.15" piping (80mm) in Euro Spec.
I have 3 inch piping......
this will not make a whole lot of difference.... make sure ur neighbors are cool with loud exhaust.... mine almost shot me...
what will make a difference is porting ur stock exhaust....
Also, get a clutch....
markski
this will not make a whole lot of difference.... make sure ur neighbors are cool with loud exhaust.... mine almost shot me...
what will make a difference is porting ur stock exhaust....
Also, get a clutch....
markski
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
Registered User
Joined: Jul 2006
Posts: 356
From: Southern California
Rep Power: 35
A 3.6 litre engine @ 1bar is breathing roughly 440 cubic inches of air per cycle. There is not a hot rodder around that would suggest putting 2.5" exhaust on a 440ci engine spinning 6500-700rpm.
On a turbo motor, post turbo exhaust flow is even more critical than on an NA motor. In the lower rpm range the 2.5" pipes will be enough, but once you start spinning it up the 3" pipes will be a payoff.
If you're going to be a bear... be a GRIZZLY!!!
On a turbo motor, post turbo exhaust flow is even more critical than on an NA motor. In the lower rpm range the 2.5" pipes will be enough, but once you start spinning it up the 3" pipes will be a payoff.
If you're going to be a bear... be a GRIZZLY!!!
Registered User
Joined: Jun 2006
Posts: 706
From: Sweden
Rep Power: 51
Originally Posted by Bodybag
A 3.6 litre engine @ 1bar is breathing roughly 440 cubic inches of air per cycle. There is not a hot rodder around that would suggest putting 2.5" exhaust on a 440ci engine spinning 6500-700rpm.
On a turbo motor, post turbo exhaust flow is even more critical than on an NA motor. In the lower rpm range the 2.5" pipes will be enough, but once you start spinning it up the 3" pipes will be a payoff.
If you're going to be a bear... be a GRIZZLY!!!
On a turbo motor, post turbo exhaust flow is even more critical than on an NA motor. In the lower rpm range the 2.5" pipes will be enough, but once you start spinning it up the 3" pipes will be a payoff.
If you're going to be a bear... be a GRIZZLY!!!
Trending Topics
Registered User
Joined: Jul 2003
Posts: 2,803
From: Missing in action
Rep Power: 214
Why not go straight to 3 in. Yes, it is a bit more work to construct the exhaust, but then you will have ample flow to grow into.
Beware, the sound your exhaust will produce is not for the faint of heart.
Craig
Beware, the sound your exhaust will produce is not for the faint of heart.
Craig
Thread Starter
|
Registered User
Joined: Oct 2006
Posts: 2,040
From: Seattle
Rep Power: 130
Thats the problem is that I dont think my neighbors will like me anymore if I do go the 3" route. I would think the 2.5" would be a little quieter? I am also going to make some 3" straight pipes for track days. When I get everything completed I will dyno the differences.
Originally Posted by dgreen78
Thats the problem is that I dont think my neighbors will like me anymore if I do go the 3" route. I would think the 2.5" would be a little quieter? I am also going to make some 3" straight pipes for track days. When I get everything completed I will dyno the differences.
Registered User
Joined: Sep 2005
Posts: 1,491
From: So Cal
Rep Power: 94
Originally Posted by dgreen78
I am planning to do a custom exhaust like Craigs (no cats, w/resonators). My goal in a few months is to have the K24/18G Protomotive package and be pushing a little over 600hp. My thoughts are that 2.5" piping will be fine at this point? Am I correct or will going to 3" be beneficial? The outlets of the stock turbo are 3".
Will there be a big sound difference between 2.5" and 3"? I noticed most all aftermarket systems are 2.5"
Will there be a big sound difference between 2.5" and 3"? I noticed most all aftermarket systems are 2.5"
https://www.6speedonline.com/forums/...ighlight=burns
Last edited by grussell; Dec 25, 2006 at 11:15 AM.
Registered User
Joined: Dec 2003
Posts: 80
From: SoCal
Rep Power: 26
Originally Posted by grussell
I have one for sale just like Craig's and built in the same shop. Why don't you just buy mine?
https://www.6speedonline.com/forums/...ighlight=burns
https://www.6speedonline.com/forums/...ighlight=burns
