Mark_ZZ3

Just curious if the ECM is able to compensate for rich/lean condition in WOT. I recall reading it did not use the O2. Thus if your running lean, you are risking some engine damage.

Is this a better question for the PROM board?
Mark.

8Mike9

O2 readings are reported, but not used.

Mark 89Formula

No compensation. The stock narrow band O2 sensor is of the switching type and does not have sufficient resolution away from stoichiometric (rich or lean) to be used for closed loop mixture control at WOT.

Mark_ZZ3

That's what I thought.

So the only way to know for sure if you running rich or lean is to put it on a dyno with a wide band O2? Or else spend hours at the track burning chips and checking your times.

This also explains why TPIS saw more HP when then simply adjusted the fuel pressure on a stock PROM setup. The early TPI's were setup to run rather lean in WOT.

I've always planned to go down to the chasis dyno. At least this is another reason to spend the money.

Mark.

8Mike9

Mark,

You could do it the "old fashioned" way...run WOT, shutdown, then read the plugs.

Mark_ZZ3

I've done that for year ... and have the scars to prove it! I've always had a hard time reading the plugs. It seems like such a faint line on the plugs. Granted if they are black, then that is easy.

I figured I might try this technology thing for a change.

Seriously though. I have always had plans to go to the chasis dyno, more for fun than anything else. But if I can get a A/F reading at WOT, that should tell me what I need to do with the fuel curve. I suspect today that I am running lean at WOT, but in everyday driving, the BLMs are fine, mileage is great. Then again, maybe everything is OK. I'd just like to know for sure.

Mark.

Ragtop89

My G@D!

Is that for real?

Our O2 sensors are totally worthless for WOT tuning?!