WOT numbers, bad MAF?

[neilb]

Hello everyone, I am still trying to figure out this lean condition under boost. I'm thinking I may have a bad MAF (I'm using a reman...) I can't seem to get a reading higher than 109.00 on the MAF using TunerProRT.

I had thought that possibly because it was going so lean, it wasn't allowing the engine to breath and therefore the MAF was reading low. So, using the TT chip I added 15% WOT fuel, which resulted in no change.

Why don't my INT or BLM numbers change when the O2 is reading so low?

What confuses me is that, from how I understand it, the TT chip should automatically lock onto a 255.00 MAF reading under WOT conditions, and above 10psi, so why is mine not? Or am I not understanding this feature right?

Here are my WOT, and some other accelerating numbers:

TPS: 4.21v
MPH: 44
RPM: 2375
ECT: 174.65
INT: 128
BLM: 118
O2: 994.56mv
MAF: 105.00
Boost: 12psi

TPS: 2.74
MPH: 48
RPM: 3800
ECT: 174.85
INT: 128
BLM: 118
O2: 004.44mv
MAF: 107.00

TPS: 2.86
MPH: 59
RPM: 3025
ECT: 178.70
INT: 128
BLM: 118
O2: 17.76mv
MAF: 107.00

 

[forcefed3.8's]

It has to hit 255 to lock. The stock ecm does not know boost, only mass air flow reading. Get a translator and an LS1 sensor.

 

[neilb]

So you agree that the MAF readings are way too low for WOT? I have had plans to get a LS1 MAF and translator, and now I have a reason to get them.

 

[neilb]

I also thought the TT chip locked onto the 255.00 reading when it saw a WOT signal from the TPS, I didn't realize the MAF needed to reach 255.00 first. Learning something new everyday! thanks