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Old 06-12-2019, 04:52 PM   #1219
Qwimby1
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Flip-flopping between E85 and 93

Ironically I have an E85 station a stone's throw from my house, but the next closest one is more than 50 miles away. Instructions that came with the OF T say not to leave it in a hot car. My car is black and lives in Florida. It would be easy enough to flash it back to 93 if I can't find any E85, but if the tablet won't survive those conditions, that takes away an option.


Question two, and tell me if this is silly, how do you handle the transition if you drive up with a nearly empty tank of 93 and fill with E85. Do you just flash it there at the station and be on your way? Vice versa with alcohol to 93?
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Old 06-12-2019, 10:55 PM   #1220
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Originally Posted by Qwimby1 View Post
Ironically I have an E85 station a stone's throw from my house, but the next closest one is more than 50 miles away. Instructions that came with the OF T say not to leave it in a hot car. My car is black and lives in Florida. It would be easy enough to flash it back to 93 if I can't find any E85, but if the tablet won't survive those conditions, that takes away an option.


Question two, and tell me if this is silly, how do you handle the transition if you drive up with a nearly empty tank of 93 and fill with E85. Do you just flash it there at the station and be on your way? Vice versa with alcohol to 93?



In regards to question 1, some people keep a jerry can of E85 at home just in case.



In regards to question 2 @steve99 has some very useful posts in his sig detailing everything you need to know and more but the answer from his post is;


http://www.ft86club.com/forums/showthread.php?t=67310


Precautions

As you have no flex fuel sensor you need take a couple of precautions when changing from petrol to E85 or the other way around.



  • Run tank down till low fuel light comes on
  • Fill with E85
  • Plug in OFT to monitor fuel trims (leave petrol tune in at present)
  • Drive slowly below 3500 rpm no WOT or hard acceleration until you see STFT rise rapidly followed by LTFT and stay high, this indicates that the petrol is now out of lines and the E85 has made it through the lines and pumps, this generally takes 2 or 3 km
  • Pull over and turn off car Flash E85 tune with OFT (Stage 2 EL E85) for stock car or car with EL headers or Stage 2 UEL E85 if you have UEL headers.
  • Start car and drive slowly again below 3500 no hard acceleration for next 10 to 20 km until your fuel trims LTFT/STFT stabilise below about 10% while cruising and idle, this allows ECU to learn the E% of your E85 mix.
  • Then do two or three light steady throttle (about 10-20%) runs in second or third gear 2000 rpm to 6000rpm (just let the rpm's build slowly), none of this is 100% necessary it just helps ECU learn quicker
  • If you do flash the E85 map at the pump on switchover the learning process will take longer as the E85 tune will try to learn petrol then when the E85 gets into the system it will need to learn E85.
Reverse procedure to go back to Petrol.




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Old 06-13-2019, 10:00 AM   #1221
Qwimby1
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Originally Posted by Boomerang View Post
In regards to question 1, some people keep a jerry can of E85 at home just in case.



In regards to question 2 @steve99 has some very useful posts in his sig detailing everything you need to know and more but the answer from his post is;


http://www.ft86club.com/forums/showthread.php?t=67310


Precautions

As you have no flex fuel sensor you need take a couple of precautions when changing from petrol to E85 or the other way around.



  • Run tank down till low fuel light comes on
  • Fill with E85
  • Plug in OFT to monitor fuel trims (leave petrol tune in at present)
  • Drive slowly below 3500 rpm no WOT or hard acceleration until you see STFT rise rapidly followed by LTFT and stay high, this indicates that the petrol is now out of lines and the E85 has made it through the lines and pumps, this generally takes 2 or 3 km
  • Pull over and turn off car Flash E85 tune with OFT (Stage 2 EL E85) for stock car or car with EL headers or Stage 2 UEL E85 if you have UEL headers.
  • Start car and drive slowly again below 3500 no hard acceleration for next 10 to 20 km until your fuel trims LTFT/STFT stabilise below about 10% while cruising and idle, this allows ECU to learn the E% of your E85 mix.
  • Then do two or three light steady throttle (about 10-20%) runs in second or third gear 2000 rpm to 6000rpm (just let the rpm's build slowly), none of this is 100% necessary it just helps ECU learn quicker
  • If you do flash the E85 map at the pump on switchover the learning process will take longer as the E85 tune will try to learn petrol then when the E85 gets into the system it will need to learn E85.
Reverse procedure to go back to Petrol.




Wow! Great help. Thanks.
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Old 06-13-2019, 05:41 PM   #1222
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Was this ever resolved? My brand new OFTv2 is having the same behavior with my 2016 Subaru BRZ. Was stock, got nearly new from CarMax, and the first time I plugged in the tablet it claimed it "read" everything okay.

However now it behaves exactly as described. You click "tuning" and it gives the mismatch error, you plug it into OpenFlash Manager and it claims it's not married to anything. Properly communicates with the ECU, pulls the version and whatnot just fine, but refuses to either be updated or to give access to the Tuning menu.

I've opened a ticket with openflashtuning but it sounds like that may not be the right way to get ahold of the company?
Just wanted to give an update in case this comes up for anyone else. I opened a ticket with the company, Anthony got back to me in about a day, and after collecting a little information from me said it was caused by a a bad software update.

He set an appointment up with me, and over about an hour got my tablet restored, the new tunes loaded, and verified with me that it was all correctly flashing.

Tablet works great now, exactly as intended! Thank you so much, OpenFlash, this is great stuff I feel confident recommending.
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