Turbo+cutout=?????
#1
Turbo+cutout=?????
Ok I figured I'd ask I am running a turbo setup on my truck with a 4" down pipe and am thinking of doing a 4" cutout now how would that effect me? I do not have the talent to log any data would I need to make adjustments to the tune or what? That is all
#2
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Depends on how restrictive your exhaust is.
On mine with the stock catback it gets silly with just the small 38mm wastegate. I let out in third at 25psi.
With the cutout closed, i see 5psi no matter what.
On mine with the stock catback it gets silly with just the small 38mm wastegate. I let out in third at 25psi.
With the cutout closed, i see 5psi no matter what.
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#9
What's ur WG doing then? Isn't it supposed to control boost to 12-13psi or what ever you set it to?
I am asking because my truck is tuned for 15psi through 3" DP and 3" straight through (when open) Varex remote controlled muffler. When the muffler is closed I can hardly build 4-5 psi but I did not push it too much because I don't drive hard with muffler closed as it's restrictive and very very quite as it's supposed to be when closed.
I am thinking to install 3" cutout before the muffler for track. Guess I will have to tune it for open cutout if my boost is going to increase to 18-20.
I noticed one time that my boost jumped to 20psi in third gear with current setup, muffler open and no cutout!!
I did not have time to test it again in 3rd gear because of transmission issues.
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That's weird that all of you have noted increased pressure with the cutout open versus closed. On my setup I never saw a psi gain by opening or closing my exhaust valve,however it made much more power with the cutout open at the same boost level versus having it closed.