Lawnboy

iTrader: (54)

NO Rear 02 sims = high LTFT ???

I have 20-25% LTFT ata cruse,
My car is Procharged and has been dyno tuned

My rear O2's are deleted , i am running FLP test pipes (no cates)

OK my tuner shut of the rear O2's , my rear O2's bank read around 450 through my intersepter scan gauge.

Is my car adding up to 25% more fuel because of maybe the rear O2's being deleted

Please let me know

dynocar

Rear O2s have no affect on fuel, whether active or not.

04BlackGmc

iTrader: (19)

yea mine kinda the same 440 or so and Lt is +6 and +5.. but i also heard they should not affect any thing.

2000c-5

The only purpose of the rear O2 sensors is to monitor the quality of the catalytic converters. The motor gets its readings solely off of the front O2s.

Lawnboy

iTrader: (54)

ok,
This answeres a lot of ?
thank you

edcmat-l1

iTrader: (10)

IFR most likely is off. If the trims are off bad at idle, thats the most likely cause. Or the VE table is WAY off, if its just at cruise, or in a specific spot.

Lawnboy

iTrader: (54)

What are IFR?
no i think its not to bad at idle, My LTFT are at 25% at a cruse, part throttle etc.

edcmat-l1

iTrader: (10)

Injector flow rate.....

2000c-5

Your IFR should have been set when the injectors for the supercharger were put in. Don't mess with them. The only time that you change your IFR is if you install bigger injectors. Just set 'em and forget 'em. It is not used to adjust fueling.