FlexFuel and Facts

[ft86tr]

I have a question regarding minimum ethanol content with e85 tune. Can we run e85 tune with any amount of ethanol as long as we are in the desired octane and driven until learning process is completed? If yes, would it be optimal such a case that can I run e30 with octane booster and e85 tune.

Since it is very hard to source both e85 and ethanol in my area, I appreciate any helpful answers

[Project_1796]

Originally Posted by ft86tr

I have a question regarding minimum ethanol content with e85 tune. Can we run e85 tune with any amount of ethanol as long as we are in the desired octane and driven until learning process is completed? If yes, would it be optimal such a case that can I run e30 with octane booster and e85 tune.

Since it is very hard to source both e85 and ethanol in my area, I appreciate any helpful answers

I run a flex fuel tune, I would not run a pure e85 tune with e30 due to the excessively aggressive timing maps in base timing b & advanced max a tables, you are better off with a stage 1 or 2 91 - 93 oct tune as a base map and tuning your car off of that instead.

[tomm.brz]

Originally Posted by ft86tr

I have a question regarding minimum ethanol content with e85 tune. Can we run e85 tune with any amount of ethanol as long as we are in the desired octane and driven until learning process is completed? If yes, would it be optimal such a case that can I run e30 with octane booster and e85 tune.

Since it is very hard to source both e85 and ethanol in my area, I appreciate any helpful answers

no. you need a flex tune and an ethanol sensor to do something like that
or have your tuner set up a slider into the Custom Inputs of ecutek and you could set realtime the ethanol percentage in tune based on fuel trims.. but you need to know what you are doing
but do not run e30 with e85 tune it is just not a smart thing, you ll run rich with huge timings

[ft86tr]

Originally Posted by tomm.brz

no. you need a flex tune and an ethanol sensor to do something like that
or have your tuner set up a slider into the Custom Inputs of ecutek and you could set realtime the ethanol percentage in tune based on fuel trims.. but you need to know what you are doing
but do not run e30 with e85 tune it is just not a smart thing, you ll run rich with huge timings

Thank you. Do you know the reason why e85 tune adapts to e50-e90 fuel but not something below e50 (other than octane)?

[tomm.brz]

Originally Posted by ft86tr

Thank you. Do you know the reason why e85 tune adapts to e50-e90 fuel but not something below e50 (other than octane)?

You think it will adapt but it adapts very poorly
Fuel trims can potentially adapt to those eth differences but in practice fuel trims are stupid and don t act smart

You want a tune that has no adaptations and smallest trims possible otherwise you risk your engine