Super High LTFT +36.77% at idle? (E85 with OFT tune)

[D4FD]

So what I've read on the forum is that E85 in regards to LTFT should be around -10% to +10% at idle but I'm not able to find any info on the extremes such as my case where I'm getting a LTFT +36.77% at idle? Is this really bad? Good maybe? The E85 pumped in my tank was minimum 70% ethanol and up to 85% which my understanding is good?(higher ethanol % the better?)

Mainly trying to figure out if my engine will be harmed. I'm still researching the LTFT thing in relation to KNOCK and all that. Should be helpful if anyone can give me a nut-shell explanation for that but not necessary as my primary concern is high positive LTFT danger to my engine?

[steve99]

It look like your still on a petrol tune with e85 in tank, double check you flashed the e85 tune and not a petrol tune
E85 tunes increase fueling by about 30%, lft of +36 indicates ecu is compensating by 36% , indicaring petrol tune

[D4FD]

Originally Posted by steve99

It look like your still on a petrol tune with e85 in tank, double check you flashed the e85 tune and not a petrol tune
E85 tunes increase fueling by about 30%, lft of +36 indicates ecu is compensating by 36% , indicaring petrol tune

I'm 100% on the Stage 2+ E85 for catless tune

[D4FD]

Originally Posted by D4FD

I'm 100% on the Stage 2+ E85 for catless tune

Shiv, what the heck did you give me? Is this why 2017 tunes are not available on the OpenFlash website...am I just another test subjects for your beta tunes?

JK by the way...

All thought I'm surprised no other 2017 owner seem to have this issue or have not replied to my post which coincides with 2017 OFT tunes info lacking? Maybe just comes with the territory of being late to the OFT/E85 game...

Will it hit +40? Idle LTFT is now +38.26% at idle...so is this dangerous?

[D4FD]

Test sig LoL

[Somerandom18]

Wow that's high. I too recently switched my 2017 to e85 using OFT. It will at times idle at + or - 12% depending on the mood.

Sent from my Pixel XL using Tapatalk

[D4FD]

Originally Posted by Somerandom18

Wow that's high. I too recently switched my 2017 to e85 using OFT. It will at times idle at + or - 12% depending on the mood.

Sent from my Pixel XL using Tapatalk

What rom are you using?

[Somerandom18]

Originally Posted by D4FD

What rom are you using?

Stage 2+ K00C v3 not v3.01

Sent from my Pixel XL using Tapatalk

[D4FD]

Originally Posted by Somerandom18

Stage 2+ K00C v3 not v3.01

Sent from my Pixel XL using Tapatalk

I got 4 roms from Shiv via email and there was 2 stage 2+ roms. One with E85 in the title name but on my other post it's been determined that the E85 rom is set up for gasoline

Any chance you can share your rom with me please?

[D4FD]

Originally Posted by Somerandom18

Stage 2+ K00C v3 not v3.01

Sent from my Pixel XL using Tapatalk

Do not try this rom, another person on my other post already confirmed that it is a gasoline tune even though the file name has E85 in it

[Ebush]

I just switched back to 93 on my 2017 due to the car having a hard time starting in the mornings (70 degrees outside). The car would sometimes have a rough idle and the LTFT would hover around the +15 area. I only ran e85 for about a week but did about 8 fill ups during that week, nearly 2000 miles. WOT pulls seemed to be ok, AFR would stay around 11.8.

UEL header, catless front pipe and no mufflers, injen intake, throttle body spacer, and Crawford intake spacers. Car ran great other than cold starts.

[Somerandom18]

Originally Posted by Ebush

I just switched back to 93 on my 2017 due to the car having a hard time starting in the mornings (70 degrees outside). The car would sometimes have a rough idle and the LTFT would hover around the +15 area. I only ran e85 for about a week but did about 8 fill ups during that week, nearly 2000 miles. WOT pulls seemed to be ok, AFR would stay around 11.8.

UEL header, catless front pipe and no mufflers, injen intake, throttle body spacer, and Crawford intake spacers. Car ran great other than cold starts.

Those IM spacers are not meant to be used on tuned cars. Let alone canned tunes that have no idea the spacers are there. The injen intake uses MAF tom foolery too to change readings. That could also be causing an issue.