Alternative Fuel Settings

Zoto

28 June 2026 00:52

I've got a M130 successfully running on a 2 litre 4 cylinder turbo engine - running both pump gas (street) and E85 (track) with Flex sensor and fuel pressure sensor.
I would appreciate some help in 2 areas to further fine tune.

Alternative Fuel Flex Fuel Flow Correction Trim - what typical settings would I expect for this table? Currently all set to 0. Injectors are 0 280 158 040. Fuel Film Film Scale Flex Primary - This table currently set to 0, albeit starting recommendation is 100%. I have no hesitation etc on acceleration with either fuel, so I'm assuming fuel film calc's etc are in order. I have changed values away from 0% but cannot feel/see any impact, which seems strange??

Appreciate any guidance.

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  Stephen Dean

  16 July 2026 08:15

  Hi,

  The flow correction is only needed if you see a drift in the lambda when going to the alternative fuel, this ismainly to accomodate the varying viscosity of Ethanol based fuels compared to Gasoline based fuels.

  If you have no hesitation or stumbling in transient conditions, I would leave this as it is.

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  Peter

  24 July 2026 06:39

  Thanks for the response Stephen.

  Since my post I have been investigating how this parameter impacts the vehicle. As I said in my post when engine at temp or close, or if ambient temp greater than 15C or so, seems to have little impact.

  What I have found, and with this parameter set to 75%, it overcomes hesitation on tip-in with E85 for the first minutes or so after first start when ambient is cold (ie 6C here in Perth). Please note I have used the “crank enrichment” table for various ethanol/98 blends to allow good start without needing any pedal.  But this initial cold hesitation on throttle blipping  could only be fixed using this parameter.

  Out of interest is the impact of this setting, in the background tied somehow into actual engine or fuel temp (which I have) - ie low temp, means higher viscosity, means this parameter has more impact but at warmer temps less impact? 

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