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Old 10-10-2017, 08:46 AM
TXFlyGuy TXFlyGuy is offline
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 332
Default ECU fuel question?

Can ECU's be programmed to burn more than one fuel type? How about SDS?

We will burn 3 different octane ratings, 91, 93, and 100. Can a single program cover all three?

Or, does the ECU need to be reprogrammed with each fuel type?
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Old 10-10-2017, 09:06 AM
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Bluelabel Bluelabel is offline
Join Date: Aug 2013
Location: San Diego, Ca
Posts: 418
Default Call Robert

The New EFII system 32 can have multiple fuel curves. The system obviously canít know what type of fuel you are running. You can access the curves through the new controller.
Give Robert @ EFII a call and he can explain in better detail.
John Walker
RV-10 N265WD
"Miss Whiskey Delta"
KMYF, San Diego, Ca.
KEOS, Neosho, MO

Crew Lead on the
Grove Aero Super Legacy Reno Racer,
twin turbo, IO-540,
full EFII management system

"so I got that going for me... which is nice."
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Old 10-10-2017, 09:41 AM
simpkinsona simpkinsona is offline
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 129
Default ECU programming

If you tune your ECU for 91 octane, it will work fine for the other 2 fuels. The main difference is how much ignition advance you can use. Fuel curves should be essentially the same. The higher octane fuels will just give you more detonation margin.

Andy Simpkinson
RV-9a Subaru engine.
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Old 10-10-2017, 04:21 PM
TXFlyGuy TXFlyGuy is offline
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 332

Thanks. The folks at Link say that a "dual mapping" procedure can be done. With a switch to tell the ECU what octane fuel is being burned, 100, 93, or 91.
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