Tuning larger LT-5 cams - ZR-1 Net Registry Forums

rkreigh · 06-27-2011

anyone do any open loop tuning to fiddle around with the calibrations? with the big cams I've heard the 02 sensors can "detect a false lean condition" and add fuel when in fact the car is already running rich

the lack of vacuum signal and high overlap of the cams contribute somehow to this.

I bit the bullet and ordereded some big manaflow universal 3" cats and although it pains me, they were only 75 each and getting them installed although it will violate my nice b&b exhaust, the fresh cats, alchy, fresh oil, and running a tank with seafoam throught the car is the route I will take.

I'm not overly optimistic but I gotta try something and before the end of july!!

06-27-2011	#24
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,080	Re: Tuning larger LT-5 cams anyone do any open loop tuning to fiddle around with the calibrations? with the big cams I've heard the 02 sensors can "detect a false lean condition" and add fuel when in fact the car is already running rich the lack of vacuum signal and high overlap of the cams contribute somehow to this. I bit the bullet and ordereded some big manaflow universal 3" cats and although it pains me, they were only 75 each and getting them installed although it will violate my nice b&b exhaust, the fresh cats, alchy, fresh oil, and running a tank with seafoam throught the car is the route I will take. I'm not overly optimistic but I gotta try something and before the end of july!!