Is there any way to run the car in OL just while WOT

[wesam]

Is there any way to run the car in OL just while WOT so the trims will not affect the AFR ?

[ScarabEpic22]

Um, isnt WOT always OL? Yes the PCM/ECM applies LTFTs, but it wont trim based off the O2s.

Look at Swingtan's VVE adjustment tutorial, it outlines what tables need to be adjusted to disabled LTFTs and STFTs.

[wesam]

I know how to disable the trims but i don't want to disable them all the time just at WOT if this possible

[wesam]

Yes the PCM/ECM applies LTFTs, but it wont trim based off the O2s.

.

Will it trim based on averaged LTFTs ?

[turbo]

when you go WOT it will go into OL and if you have LTFT enabled it will add the % of LTFT to the end result. E38 will add and take LTFT from total WOT.

[wesam]

Ok thats what i'm asking about
is there any way to disable LTFTs in E38 just at WOT ?

[turbo]

not sure on that one i always disable LTFTs and leave it disabled, but if you get your VVE or maf spot on LTFTs should be within +or-1% so it wont make bugger all difference at WOT

[wesam]

In FI cars with bigger injectors and aftermarket cams some time the LTFTs will be around -+2% or 3% and that will make a big difference and could risk the car so i want to disable it at WOT

[swingtan]

The E38 WILL NOT go OL at WOT, there is no "semi-OL" like we get in the LS1 COS3/5.

What the E38 will do is go into PE mode, if the correct conditions are met, or it will stay in normal CL mode.

To prove this, look at the OL fueling tables. The settings here are not used any time the engine is in CL or PE mode.

If you are concerned about WOT mixtures, get your fueling correct and run CL STFT only. The E38 will generally correct +/-25% with just STFTs , but you should get them within +/- 5%. If you get the fueling right to start with, LTFT can be safely turned off, but you need to ensure you get the rest right. This includes IAT, charge temp and barometric corrections.

Simon.

[wesam]

How to run CL STFT only?