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08-22-2017, 01:34 AM | #1 |
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Help with OFT just switched E85 - LTFT help needed
Hi, I just switched to e85 through OFT a few days ago, been logging. I noticed my LTFT on 91 was fine under +5 usually. Now since I switched to e85 the LTFT varies a lot more from -3 to -5 idle and usually -10 under regular throttle. I have 2 logs 1 with 91 and 1 with e85 hope someone that knows more then me can take a look.
all 3rd gear pulls in 85-90F ambient, low humidity I have UEL headers, test pipe catback w/ resonator right now. Drop in K&N filter w/ silicone sleeve. 91 - stage2 brz UEL headers http://www.datazap.me/u/hyped23/2013...=2&data=1-2-11 e85 - stage2 brz UEL headers http://www.datazap.me/u/hyped23/e850...=0&data=1-2-11 Let me know what you think, I'm not sure if just bad e85 or maybe a exhaust leak? If you have time look at the rest of the log paramaters as well. but I went from around +2 LTFT on 91 to -10 on e85...? Thanks - Alex edit* I just installed headers a few days ago, all new gaskets torqued all. Then ran 91 seemed great and switched to e85 once I ran low did everything properly but it all happened in only a few day time span. I added roughly a gal of 91 just to see, and LTFT seemed to drop to -8(very low throttle), but now going back up over -10 to -13 (mid throttle) with more driving. Last edited by Hypd.Lv; 08-22-2017 at 04:26 PM. |
08-22-2017, 02:59 AM | #2 |
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You have that backwards.
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08-22-2017, 03:22 AM | #3 |
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08-22-2017, 09:57 AM | #4 |
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Most likely low ethanol content. I switched over to e85 with just under 1/4 tank of 93 in there (Not recommended). Have the same LTFT -5 to -12 when cruising. It's slowly fixing itself as the 93 is replaced with more e85. As long as there isn't knock it shouldn't be much of an issue. It can compensate up to 40% so you're not even close to the fuel trim limit.
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08-22-2017, 10:15 AM | #5 |
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You should see your LTFT even out over your next couple fill-ups. Residual petrol lowers E%.
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2013 Whiteout 6AT FR-S | Perrin Inlet Tube + 2.75" CAI | OpenFlash Header | P&L Catback | 4.88 Final Drive | Dialed in OFT 2.0x Stage 2 E85 | 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport | 17x7 Stock + 215/45 Michelin X-Ice Xi-2
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08-22-2017, 04:22 PM | #6 |
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Thanks for the info, I think its probably just really low e% then, I can try to source some other places but there is not a lot of e85 in my area.
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08-22-2017, 04:25 PM | #7 | |
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Quote:
I think I messed up by adding a gal of 91, now LTFT seems even higher -13 to -14 but havnt logged to confirm. I just wanted to see what happens, but I think I will siphon this out and start over. |
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08-22-2017, 04:38 PM | #8 |
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When the fuel light comes on you've got ~3 gallons left in the tank. Run Torque to get a more accurate fuel level reading, and you can run it down even further.
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2013 Whiteout 6AT FR-S | Perrin Inlet Tube + 2.75" CAI | OpenFlash Header | P&L Catback | 4.88 Final Drive | Dialed in OFT 2.0x Stage 2 E85 | 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport | 17x7 Stock + 215/45 Michelin X-Ice Xi-2
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08-22-2017, 05:09 PM | #9 | |
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I'm not familiar with torque? I'm still new to OFT and e85, I have minor experience with other tuning systems and 91/100 oct fuel mostly ***Now that the LTFT is getting as high as -15% under minor load what should I do?? would switching to 91 map do anything. What would happen if I added 100 octane gas, would this be bad? Last edited by Hypd.Lv; 08-22-2017 at 07:13 PM. |
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08-22-2017, 09:57 PM | #10 |
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I'm running on -7 LTFT for the longest time, and as long as it doesn't get TOO low, apparently you should be ok. It's just the ethanol content from the pump that's too low. Definitely not e85 as they advertise here in AZ. More like what? E60 maybe
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08-22-2017, 11:17 PM | #11 |
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When you are on E85 the LTFT are less of a concern than on 91 or 93. OFT allows the LTFT to make up for variances in ethanol concentrations rather than a flexfuel setup. By the time you run another 2 tanks of your local E85 through the car things will have stabilised.
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08-24-2017, 02:39 AM | #12 |
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yeah las vegas sucks so far. I seen one pump that advertises anywhere from 50-80% ethanol that's huge variance. The one I bought from says 85%E but no fukn way the fuel trims seem way off. It got worse by adding in gal/91 so I wouldn't recommend anyone do that.
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08-24-2017, 02:42 AM | #13 | |
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08-24-2017, 02:45 AM | #14 |
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Somewhere on the forums Shiv has mentioned there is no power difference from E65 and up.
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data logg help, e85 data logg, e85 tune help, oft help |
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