How much boost do you lose when you install longtube headers?
01-13-2005, 09:35 PM
#4
Drifting
loosing boost is a good thing in this case, as it means more of the charge is making it's way into the combustion chamber instead of backing up in the intake manifold
01-14-2005, 12:47 PM
#10
Melting Slicks
Member Since: Dec 2003
Location: Near Jacksonville Fl.
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It depends on the other mods you have done and if the exhaust system is really the restriction. 
When I added 1 3/4 kooks last year with 3" high flow cats and 3" X pipe and full 3" pipes back to the mufflers I thought I had lost at least 2lbs of boost.
So I called ATI and they suggested I go to a 3.6" pulley from my 3.85" well to make a long story short the loss of boost turned out to be belt slippage.
I kept the 3.6" pulley but limit the revs to 6000 to keep the boost to 8.2lbs.
The advantage is boost comes on at a lower rpm.
When I added 1 3/4 kooks last year with 3" high flow cats and 3" X pipe and full 3" pipes back to the mufflers I thought I had lost at least 2lbs of boost.
So I called ATI and they suggested I go to a 3.6" pulley from my 3.85" well to make a long story short the loss of boost turned out to be belt slippage.
I kept the 3.6" pulley but limit the revs to 6000 to keep the boost to 8.2lbs.
The advantage is boost comes on at a lower rpm.
