UPDATED!! OFT E85 EL map, high LT fuel trim

[DarkMatter]

Originally Posted by swarb

There is a thanks button on the bottom right of each post.

The tune is made for the stock intake.
If replacing the intake doesn't work, then it isn't the intake that is causing the problem. At that point I would say there is an exhaust leak at the header somewhere, or you have much bigger problems and I'm out of ideas. I'm pretty sure it's the intake.

I only have a Quote and " option. Don't see a thank button...

So I added the OEM intake back, capped off the sound pipe, and didn't install the part that goes under the bumper..

Reflashed the e85 tune and drove around for about 20 miles. LT trim after the drive is at 20%. I'll try to drive a bit more tomorrow and figure out whats wrong. The part of the intake that goes under the bumper shouldn't skew the trim this much right? If so, I can try installing that part too.
So AFR is at 14.6:1 and LT trim goes to 0 on acceleration. When I first started the drive, LT trim was 3%. Gradually rose as the drive went on.

I can't reflash to 93 right now bec i have more than 3/4 of e85 left in the tank.

[swarb]

Originally Posted by DarkMatter

I only have a Quote and " option. Don't see a thank button...

So I added the OEM intake back, capped off the sound pipe, and didn't install the part that goes under the bumper..

Reflashed the e85 tune and drove around for about 20 miles. LT trim after the drive is at 20%. I'll try to drive a bit more tomorrow and figure out whats wrong. The part of the intake that goes under the bumper shouldn't skew the trim this much right? If so, I can try installing that part too.
So AFR is at 14.6:1 and LT trim goes to 0 on acceleration. When I first started the drive, LT trim was 3%. Gradually rose as the drive went on.

I can't reflash to 93 right now bec i have more than 3/4 of e85 left in the tank.

I think you get the thanks button after 10 posts.
You can add a gallon or two of 93 to lower the ltft as the oft tune is a slightly safe tune and good for e60-e70 or so.
I suggest checking for exhaust leaks, and double check which e85 tune you are running. There is a open flash header e85 tune and non ofh e85 tune which is a little more conservative.
After all that, I'm all out of ideas and suggest you to post on the e85/oft thread or make a new one.

[zmz0305]

Originally Posted by DarkMatter

I only have a Quote and " option. Don't see a thank button...

So I added the OEM intake back, capped off the sound pipe, and didn't install the part that goes under the bumper..

Reflashed the e85 tune and drove around for about 20 miles. LT trim after the drive is at 20%. I'll try to drive a bit more tomorrow and figure out whats wrong. The part of the intake that goes under the bumper shouldn't skew the trim this much right? If so, I can try installing that part too.
So AFR is at 14.6:1 and LT trim goes to 0 on acceleration. When I first started the drive, LT trim was 3%. Gradually rose as the drive went on.

I can't reflash to 93 right now bec i have more than 3/4 of e85 left in the tank.

Yeah, try add some 93 to your E85. Before I added 1 gallon to my half tank it was 17%, so almost as much as your 20%.

Another thing worth mentioning is that before I add that gallon of gas I can hardly start my car on the first try in the morning around 60 degrees but now I have no problem starting my car. So I assume the ethanol percentage is really high before adding petrol, because ethanol does not evaporate as much as petrol in low temperature and causing the ignition problem.

[DarkMatter]

Originally Posted by zmz0305

Yeah, try add some 93 to your E85. Before I added 1 gallon to my half tank it was 17%, so almost as much as your 20%.

Another thing worth mentioning is that before I add that gallon of gas I can hardly start my car on the first try in the morning around 60 degrees but now I have no problem starting my car. So I assume the ethanol percentage is really high before adding petrol, because ethanol does not evaporate as much as petrol in low temperature and causing the ignition problem.

That's exactly what happened to me! After my fill up, the next day I tried to start my car and it struggled for a second. Never had that happened before. After reflashing today, the car turned on and stalled out. Started fine the second time. So i'll try that. Thank you

[Kodename47]

Originally Posted by DarkMatter

The part of the intake that goes under the bumper shouldn't skew the trim this much right? If so, I can try installing that part too.

If you're on about the intake tube (AKA snorkel) then not having this in place will leave you more susceptible to high IATs after being stationary which will have a knock on effect to fuel trims.

[guybo]

Do you have a catch can? If so, check the vacuum lines and make sure they are tight. You could have a vacuum or header leak with high pos. fuel trims.

At idle and at 2500 RPM, how is your LTFT compared to your STFT? Does your STFT shoot up as you rev it?

[zmz0305]

Originally Posted by guybo

Do you have a catch can? If so, check the vacuum lines and make sure they are tight. You could have a vacuum or header leak with high pos. fuel trims.

At idle and at 2500 RPM, how is your LTFT compared to your STFT? Does your STFT shoot up as you rev it?

I just tried, STFT does shoot up to around 5% when rev up to 2500RPM. Does that mean I have a leak?

[steve99]

Originally Posted by zmz0305

I just tried, STFT does shoot up to around 5% when rev up to 2500RPM. Does that mean I have a leak?

stft will move rapidly with load and throttle application this is normal.

just look at your ltft

oft tunes will have low ltft with arround 70% ethanol

above 75% or high ethanol will see ltft trend positive

lower than 70% ethanol will see ltft trend positive

once you see over 10% at anything above idle then it indicates large variance in e% or you have other problem like intake or exhaust leak or maf scaling issue to aftermarket intake

[guybo]

Nah, 5% is nothing. It doesn't look like you have a leak.

[Nah]

Bro e85 varies every time you put a new tank in. I'll scale my MAF for one full tank get it perfect than I'll fill up again it'll be off by a couple percent. Your intake is definitely causing the high fuel trims. Scale your MAF... If you don't wanna do it in sure me or Steve or KN47 will do it... Perhaps for a fee... I don't know depends how generous they are because time is money... but I promise either one of us will promise you some results lol... Oh to really achieve even better drive ability there's a few tricks I'm sure we know as well (;

[zmz0305]

Originally Posted by Nah

Bro e85 varies every time you put a new tank in. I'll scale my MAF for one full tank get it perfect than I'll fill up again it'll be off by a couple percent. Your intake is definitely causing the high fuel trims. Scale your MAF... If you don't wanna do it in sure me or Steve or KN47 will do it... Perhaps for a fee... I don't know depends how generous they are because time is money... but I promise either one of us will promise you some results lol... Oh to really achieve even better drive ability there's a few tricks I'm sure we know as well (;

Yeah I have tested and I am pretty sure it is the ethanol content.
I added some 93 and it all goes well.
Very unfortunately I cracked my OFT screen this morning and I am screwed now