Generation III External Engine - BackPressure Question Help
11-08-2003, 02:31 AM
the car seems sluggish could this be from having no cats on? i was told that the LS1 motors run better with cats then without. Also my torque curve on my dyno sheet seems really low it starts out low and kinda gradually goes up then starts to take a shit at like 5100. I was expecting a steeper curve. could having no cats effect that also? Thanks
cats shouldnt affect your backpressure to the point of loosing any power. most people gain some hp by romoving cats and there are plenty of people who run ORY's. have you autotaped the car to check your afr or anything, you might be running rich.
post your dyno as well
12-03-2003, 06:07 PM
My car has 1 7/8 headers and a 2 7/8's offroad y pipe into a 3" I pipe. Basically no back pressure ;) It runs alright ;)
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