tuning pe tables on 0bd1 lt1.

[criticalx]

i was tuning in more fuel on my car using the afr vs rpm vs wot tables using o2 reading as guide. it was doing good. number was going up then tired one tune they went down.. then went back to old tune.. they still reading low. any reason this happen? i know o2 not most reliable.. got save money for wide band

[steveo]

there is no hope for tuning power enrichment directly with a narrowband.

but what does work well in absense of a wideband, is disable power enrichment for a bit and properly tune your VE or MAF tables using blms (dont hammer on it at high rpms, and i always set high rpm and load areas a bit rich at first).

once your ve or maf table is pretty close for normal driving, whatever you put in that afr vs rpm vs wot table is probably "fairly accurate".

[criticalx]

there is no hope for tuning power enrichment directly with a narrowband.

but what does work well in absense of a wideband, is disable power enrichment for a bit and properly tune your VE or MAF tables using blms (dont hammer on it at high rpms, and i always set high rpm and load areas a bit rich at first).

once your ve or maf table is pretty close for normal driving, whatever you put in that afr vs rpm vs wot table is probably "fairly accurate".

it's speed density tune and ve tables are close after having car tuned before. They didn't change much after heads.. but wot it's going lean.

[steveo]

you'll at least be able to define the point(s) of 'lean' with a narrowband. it'll be pegged above 500mv until the 'lean' spot when it'll drop below. then just add about 10% fuel in that area and see how she goes.

[brian617]

Might be running out of fuel, check your injector duty cycle. You can add all the fuel you want, but if your injectors are static nothing will change.