E85 longevity/reliability

[sms2022]

I had to flash back to the stock tune to take the car to the dealer this morning and was running 28% ethanol on the stock tune in 30 degree weather. It ran fine at very easy throttle the 10 miles to the dealer but the AFR looked a lot leaner than I would like. I’ll be reflashing my Flex tune in the parking lot before driving home.

to our French friend, get an E85 device and stop playing with fire.

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[engineermike]

@sms2022 why do you say the AFR was lean?

 

[Alizecha]

Merci SDskinner
What kind of device you use to flash your car?
Can you follow your long time fuel trim (LongFT or LTFT) Before and After flashing ?
Your values could help Me
My AFR still stable around 14.5.
I really wonder if there isn't a tune already installed in my baby

 

[sms2022]

@sms2022 why do you say the AFR was lean?

Dash readout showed 15.1-15.7:1 on acceleration. At cruise it seemed to correct and went to 13:1

 

[engineermike]

Dash readout showed 15.1-15.7:1 on acceleration. At cruise it seemed to correct and went to 13:1

I wouldn’t expect that, especially with a flex tune.

 

[sms2022]

I wouldn’t expect that, especially with a flex tune.

You missed when I said I had to flash back to stock tune to go to the dealer and then that happened lol.

On the flex tune it’s perfect 12:1-13:1 at E50

 

[engineermike]

You missed when I said I had to flash back to stock tune to go to the dealer and then that happened lol.

On the flex tune it’s perfect 12:1-13:1 at E50

Ok but I still wouldn’t expect it to go lean on acceleration. The fuel trims should easily handle that. There is some funny logic behind the dash aft gauge. I think it’s showing commanded lambda x stoich, and commanded lambda has fuel trims baked in.

 

[sms2022]

Ok but I still wouldn’t expect it to go lean on acceleration. The fuel trims should easily handle that. There is some funny logic behind the dash aft gauge. I think it’s showing commanded lambda x stoich, and commanded lambda has fuel trims baked in.

makes sense. I didn’t data log it and won’t run it like that again so it is what it is. It did run fine though and started right up no issue.

 

[K4fxd]

There is some funny logic behind the dash aft gauge.

The dash gauge is frustrating. I also believe it is some combination of factors and not really what the AFR is.

After many thousands of logs and testing, I just ignore the dash indicator. The check engine light comes on before any discrepancies in lambda.

 

[Alizecha]

You dont have the same régulation between slow and fast accélération

 

[Unas2k5]

Catch can helps with deposits too

My catch can was almost full. Looked like oil and then white stuff at the very bottom. This is after dumping it

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