1.8mike

Ive noticed when people do runs to check for air/fuel with the vag its always full throttle.

If a rich condition occurs how does that affect the part throttle and normal driving? Will a rich condition still occur or will the computer correct for this somehow?

I guess an example is pc16 with 3bar fpr. Everyone knows this will run rich but is that only full throttle or all the time?

Reason I ask is I am using a boost controller but it only activates at full throttle and uses the N75 the rest of the time. I would like to up the boost and fuel a little but dont know how that will affect "normal" driving. Would I still run rich at say highway crusing and part throttle or will the computer be able to correct for this?

4Rings::G2 boosted::

to self-adjust the a/f mixture to 14.7:1. Any changes to the a/f map, fuel pressure, air temp, etc. will be compensated for by the LTFT (long term fuel trim). The LTFT levels adjust the injector timing and there is +-20% compensation before a CEL is thrown.

Once you apply more throttle the ECU will switch to open loop (based on the load calculation, not necessarily WOT) during which it bases the a/f mixture purely of the build-in maps and trim levels. The O2 sensor readings are ignored. Any change to the a/f map at that point will result in direct change of the a/f mixture.

As a result open throttle is the only area that can be tuned, close loop can only be adjusted so that the LTFTs stay close to 0.

1.8mike

Thanks