Boost aim off flex fuel levels

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Boost aim off flex fuel levels

Postby DaveTS on Mon Sep 13, 2021 2:28 pm

Hi there,

I'm using an M142 with package: GM LLT 3.6 Hi Lo & firmware: GPR-DI(M142).
I want to adjust the aim boost levels based off the flexfuel sensor %ethanol. How do I achieve this?

Thanks for your time.
Cheers,
Dave
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Re: Boost aim off flex fuel levels

Postby NathanB on Mon Sep 13, 2021 3:05 pm

Hi Dave,

You need to have the alternate fuel mode set to flex fuel, and have a boost output resource assigned to add all the boost control systems.

You are then looking for the 'fuel composition boost limit (%)" table.

This applies a scaling between the boost activate and boost aim main.

As this table has a maximum value of 100%, you set you boost aim table to suit your higher boost fuel (high ethanol content) and use the table to scale down for your lower octane fuel settings.
Attachments
GPR - Flex boost limit help.PNG
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GPR - Flex fuel boost limit.PNG
GPR - Flex fuel boost limit.PNG (11.05 KiB) Viewed 488 times
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Re: Boost aim off flex fuel levels

Postby DaveTS on Mon Sep 13, 2021 4:21 pm

Hi Nathan,

Excellent, thanks for this information, all sorted.

Cheers,
Dave
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Re: Boost aim off flex fuel levels

Postby SDean on Mon Sep 13, 2021 5:09 pm

More information on the Flex Fuel system operation in the M1 here
Stephen Dean
MoTeC Research Centre Melbourne, Australia
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