Feature request: multi fuel blend ratio > 100%

[ac123]

We should be able to set the multi fuel blend ratio above 100% and the software should extrapolate the fuel table values accordingly.

The scenario is you tune the car on E70 in the fall/winter, and then later fill it up with E85 in the summer. Right now you have to manually extrapolate the fuel table 2 in excel and it's a huge pain. This could easily be done by the software with a multi fuel blend % > 100%.

In this example you'd set the table up like this:

Multi Fuel Blend Ratio Table
% Ethanol (%)
 11          70
0.0       100.0       

Then if you filled up E85, it would automatically extrapolate the blend value over 100% and scale the relevant fuel properties accordingly. You'd then be able to add points in the table above 100 to adjust the tune accordingly at various points between 70% and 85%. Ideally it would be a toggle setting because this might be unexpected behavior unless you intended to extrapolate.

[Adamw]

Your "fuel table" should be very little different for any fuel if your fuel properties are correct.  There is only a small change to VE from the change in exhaust gas temp and mass flow.  

The strategy you describe would give the same result as entering E100 (or E85 if that's the highest you will ever see) fuel properties in the multifuel settings with a blend ratio table ending in 100%(or 85%)eth = 100%blend.  Then tuning at some lower content.  The multifuel injector flow rate needs to be tested at the same content as whatever multifuel properties you have chosen.

 

 

[koracing]

My guess is the injector flow rates vary more with differing fuels than the limited supplied data would suggest.