Okay ... this is going to hurt ... [grabbing ankles]

According to Hondata, LTFT is NOT applied during open loop. It seems crazy to me that it wouldn't be applied, but I figure there's nobody outside of Honda that knows more about the factory Honda ECU's than him.

EDIT: I apologize to Spectacle for arguing so insistently.

 

good read.

side note, does flashpro let you turn on 02 feedback at wot? is it selectable?

 

FlashPro allows you to set the parameters that determine when open loop is triggered. You can have open loop triggered by throttle position (%) or by manifold pressure. If you want to run in closed loop all the time, then you can just set the determination point very high.

You can also set the limit of min / max STFT. I have my min / max STFT set to +/- 5%, which seems to give better throttle response.

 

Got a link?

I stand corrected. I'll defer to anything Hondata says about the matter.

 

What is then considered in open loop? just the pre-recorded maps in the ECU/Piggyback? maybe MAP?

Would that mean that there's no risk on going WOT directly after a ECU reset since no trim adjustements are considered?

Would that also mean that the ECU considers safe to ignore trims in open loop even thought it knows that in closed loop it needs a constant correction of (for example) +10? sounds kind of risky...

 

Here is the post on Hondata's forum.

I guess someone should kill the myth about VAFC's being tuned out over time. I guess we should also NEVEr go WOT in a higher mileage car unless we periodically install a wideband O2 sensor to make sure it won't detonate to death at full throttle.

The ECU considers NOTHING but butterflies and candy canes once you go full throttle.

 

Forgot to give the Cliff's note:

The danger of applying LTFT during open loop is that a bad O2 sensor could cause extreme / incorrect LTFT's that will do a lot more damage at full throttle than at part throttle.

 

Except the ECU throws a trouble code "System Too Lean" or "System Too Rich" when the LTFT exceeds 20% (IIRC) and your car goes into limp mode.

 

Are you sure about that 20%? If my O2 sensor was reading 10% too high or low, I would REALLY want to know.

 

wow wow wait.. it should consider at least things like MAP, ECT, IAT, barometric pressure etc... if not, I will never again go WOT