dual cutouts vs. single
dual cutouts vs. single does it matter if I put a single cutout after the y pipe comes together or should I do duals after the headers. I will be doing a cam sometime in the next few months so i dont know which would be better or even if it makes a difference.
Also, I assume duals would be louder right? Either way, it would be before the cats and muffler so would one be that much louder than the other?
Also, I assume duals would be louder right? Either way, it would be before the cats and muffler so would one be that much louder than the other?
Last edited by z28convert; Dec 21, 2005 at 02:49 PM. Reason: adding
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Backpressure not an issue.
Lack of back pressure does not have any adverse effect on the LS1 engine. Lack of "backpressure" simply moves your peak torque up higher in the rev range. You actually gain tq., it's just higher in the rev range, thus, car feels "slower" when you punch it low in the rev range, but indeed will be faster through the 1/4 mile.
Lack of back pressure does not have any adverse effect on the LS1 engine. Lack of "backpressure" simply moves your peak torque up higher in the rev range. You actually gain tq., it's just higher in the rev range, thus, car feels "slower" when you punch it low in the rev range, but indeed will be faster through the 1/4 mile.
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Originally Posted by SouthFL.02.SS
Backpressure not an issue.
Lack of back pressure does not have any adverse effect on the LS1 engine. Lack of "backpressure" simply moves your peak torque up higher in the rev range. You actually gain tq., it's just higher in the rev range, thus, car feels "slower" when you punch it low in the rev range, but indeed will be faster through the 1/4 mile.
Lack of back pressure does not have any adverse effect on the LS1 engine. Lack of "backpressure" simply moves your peak torque up higher in the rev range. You actually gain tq., it's just higher in the rev range, thus, car feels "slower" when you punch it low in the rev range, but indeed will be faster through the 1/4 mile.
i know know of a dyno verified 5hp and 5tq loss with dual cutouts about 15" behind headers opposed to tsp duals
this was on a 245/259 cam car with afr heads and all bolt ons with killer tune
tuning could not recoup the power loss after opening cutouts
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Verdad Gallardo !LS1 11 Second Club
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Originally Posted by Lithium
People are loosing hp with dual cutouts.
Stick with the single.
Stick with the single.
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Originally Posted by TNMuscle
I heard that there is not enough backpressure and you could end up losing hp and tq
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From: Miami
Backpressure. Hehehe.
Over a restrictive exhaust (i.e. stock muffler/ slowmaster catback), a cutout will open up your exhaust flow.
You will gain hp.
You will gain tq.
Your peak tq. will shift higher in the rev range, thus feeling sluggish down low. You will be faster when keeping engine speeds up.
Over a restrictive exhaust (i.e. stock muffler/ slowmaster catback), a cutout will open up your exhaust flow.
You will gain hp.
You will gain tq.
Your peak tq. will shift higher in the rev range, thus feeling sluggish down low. You will be faster when keeping engine speeds up.
Last edited by SouthFL.02.SS; Dec 28, 2005 at 07:37 PM.
i didnt lose any with mine. i have dual cutouts right behind the headers and on a superflow dyno, when i had a hotcam in my car, i picked up 15rwhp with the cutouts open, versus having them closed and goin through an SLP loudmouth catback.
