AutoVE not working - SOS!

[Tordne]

Hey TA, what do you think about the IFR table not being flat on the truck? He says he has disabled the boost reference but I don't know enough about it. I just know that the stock trucks IFR tables are flat, and that if this is the problem he will be over fueling by huge amounts...

[joecar]

Thinking about it...

map-referenced: IFR = R0 * sqrt((FP + BARO) / P0) = constant (e.g. truck)

non-referenced: IFR = R0 * sqrt((FP + BARO - MAP) / P0) = reverse sloped with MAP (e.g. car)

so the map-referenced IFR would be higher than any non-referenced IFR (since MAP never goes to zero);

the higher IFR means the injectors open for a shorter period to deliver the same fuelmass;
so this and the flat IFR means he will be underfueled, especially at high MAP;

Have I gotten it right, or have I mess it up...?

[jamesbond2509]

I tried using a flatlined IFR at 43 (as previous) and no luck! Any other suggestions. Still desparate!

[jamesbond2509]

I went over the tune with Jesse at Wait4me and concluded that either the IFR's need to be adjusted or my VE is way off. so I will try some things over the weekend. If you have any more recommendations please advise.

Thanks!

[Tordne]

So basically what I said then Good luck...

[joecar]

Yep, what Andrew said; IFR is required to be correct otherwise everything else is skewed.

[jamesbond2509]

Andrew and Jocar

Changing the IFR worked!

Thanks for your quick replies!

[Tordne]

Happy to help mate!