My misadventures with E85

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Sep 7, 2010 | 06:36 PM

#41

Gernby

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Quote:

Originally Posted by INTJ,Sep 7 2010, 09:08 PM

There are sensors for e85, could you wire that and relay the tables for an timing kludge? Say run it main tables for e85, sensor trigger for normal gas cuts the timing back and leans a bit as a failsafe?

I don't know if it's you or I that had too much to drink, but this doesn't make any sense at all.

It seems that the OEM wideband sensor should work fine with E85, so I don't think I need to change anything other than the injectors and the tuning.

Jan 1, 2011 | 09:30 AM

#42

INTJ

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Sorry, I wasn't very clear: E85 is all over the map in terms of blends and relative concentrations from store to store from load to load. This makes it difficult to tune properly: http://forums.evolutionm.net/alternative-f...viewed-ttp.html

Jan 2, 2011 | 01:36 AM

#43

bpaspi

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Quote:

Originally Posted by deathsled,May 22 2008, 07:36 PM

I spent an entire tank of e85 driving around town aggressively. I was able to get the LTFT up to 20% in addition to the corrections being made by the STFT. Only then did the car start to run almost acceptably at increase throttle angles. I could still tell that the car was much weaker than when running on 93 octane however. The next problem was that 1 12 mile trip down the interstate to work was enough for the ECU to lower the LTFT back down to 0, which now meant that I can't go full throttle again, and would need to spend a whole tank of e85 again getting the ECU to relearn.

Interesting. So you noticed that LTFT is also applied during higher loads? In open Loop mode?
Can you confirm this?

Jan 2, 2011 | 07:57 AM

#44

Gernby

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^ That story from deathsled doesn't even make sense. It sounds like he's saying that LTFT would drop down to 0 in closed loop, and would only go up to 20% after lots of OPEN loop. That's just crazy talk.