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oztracktuning
February 2nd, 2006, 11:03 PM
I just got a tank of 10% Ethanol Fuel and did a few logs. Using a PLX wideband the AFRs which i display in AFR seem to have leaned out by about 2% . What do i do - do i tune for the same number again in AFR i.e. add more fuel in the VE table.

Steve
oztracktuning
February 3rd, 2006, 12:01 AM
What i have done so far is add 3% across the whole map. At the moment the fuel is about a 75% mix of Boost 98 (10% ethanol) and 25% Normal Caltex Vortex 98. ....So i guess its Stoich is around 14.25 so it should be about 2.6% leaner...but once i fill again with the Ethanol Fuel this will change to 14.13 and 3.4% leaner overall.
GMPX
February 3rd, 2006, 09:41 AM
You could run one of the 2002 US O.S's with the Ethanol correction tables......get the special sensor they use......ahh, no, just drive past Shell to BP and buy Ultimate instead.

Cheers,
Ross
oztracktuning
February 3rd, 2006, 10:02 AM
I have done the research and it is my bet that Boost 98 is better than Shell Extreme.

The tunes dont look like they need to be that different - first run yesterday with my latest best Caltex Vortex 98 tune :banana:
the car logged at WOT did as lean as 13.2 between 4400 and 6100 but recorded no knock retard. So it seems like a good thing.
emarkay
February 4th, 2006, 05:16 AM
Interesting - I wonder if it would be possible to use E85 (85% ethanol, 15% gasoline) in these cars, with the proper tuning.

Naw, never mind....
http://www.e85fuel.com/e85101/faqs/conversion.php
more info...
http://www.eere.energy.gov/afdc/e85toolkit/e85_fuel.html
http://www.iowacorn.org/ethanol/ethanol_5a.html
Extinct
February 4th, 2006, 01:30 PM
You could run one of the 2002 US O.S's with the Ethanol correction tables......get the special sensor they use......ahh, no, just drive past Shell to BP and buy Ultimate instead.

Cheers,
Ross

Ross, can you please elaborate on the special sensor a little more ? Is it a special 02 ? How does the OS know when you are on Ethanol vs. Petrol ?
Tydriver
April 28th, 2006, 03:24 AM
Ross, can you please elaborate on the special sensor a little more ? Is it a special 02 ? How does the OS know when you are on Ethanol vs. Petrol ?

FWIW, theres an active thread over here:

http://efiforum.iqd.co.nz/showthread.php?t=2432&highlight=ethanol