exhaust changing tune
01-11-2007, 10:53 AM
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exhaust changing tune are there any potential tune problems running a stock catback most of the time and then running a cutout open when i'm gonna really do some dragging. don't have a wideband yet so i haven't been able to check how much afr changes. does the computer compensate enough for this drastic of a back pressure change? and could the stock catback's back pressure hurt motor in any way, or just kill power?
01-11-2007, 12:11 PM
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Anytime the engine breaths better, it will lean out some. Whether you take the air filter out or relieve a restriction in the exhaust, it has the same effect. I took the filter out after a dyno pass and noticed a 0.2~0.4 difference in my recorded AFR on the next run. If your car is tuned to run 12.8-13.0 on the stock exhaust setup, you might want to have it richened up a bit for when you open the cutout.