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So I put some E85 and did some logging and the car work well. I did 3 pulls on 93oct back to back, on the first pull I forgot to turn off the AC. Then I went and got some E85 and did 3 pulls back to back. The interest thing is that the car makes peak torque later in the rpm than on just 93oct. For some reason on the last 93oct the car applied about 1.5° less of timing; maybe it was because of heat soak but the intake temp and coolant temp were the same as the other passes. Another interesting thing is that with the extra E85 the car leans out through most of the rpm range but at redline it goes to the same AFR as on 93oct.
Yes sir. I just did it because I knew that my car runs rich on 93oct and I was curious what would happen if I could make it lean out to the optimal 13.5 AFR for NA cars. Also this combo has an octane rating of about 96 oct.
Originally Posted by MRxSLAYx
I'm very surprised that your car didn't knock. My car knocked hard at 15-18% e85
How lean did your car get? Every car is different, mine likes to target mid 12 to low 12 AFR on 93 Oct. As far as my experience with turbo cars; E85 is knock deterrent you can run crazy timing if your AFR's are on target.
Very cool.. Do you think the ecu will learn to trim the Afr to the 93 octane levels? I suspect it will after some time, not sure if that will help or hurt performance?
How lean did your car get? Every car is different, mine likes to target mid 12 to low 12 AFR on 93 Oct. As far as my experience with turbo cars; E85 is knock deterrent you can run crazy timing if your AFR's are on target.
My car ran somewhere in the 15afr range if I remember correctly. Makes sense that your trying to get your afr's a little leaner, but you should keep in mind that e85 makes peak power at a different lambda that regular gas.
Its such a pity we cant tune our cars. Ive tuned both of my FRS' on e85 and the difference is amazing. I haven't hit the dyno yet, but ive probably picked up about 50hp with just the tune and e85 on the horrible subi motor. I could only imagine what a 2ur would perform like with just a tune and good batch of e85.
Very cool.. Do you think the ecu will learn to trim the Afr to the 93 octane levels? I suspect it will after some time, not sure if that will help or hurt performance?
Probably but I am not planing on this all the time; maybe only when I go to the track.
Originally Posted by MRxSLAYx
My car ran somewhere in the 15afr range if I remember correctly. Makes sense that your trying to get your afr's a little leaner, but you should keep in mind that e85 makes peak power at a different lambda that regular gas.
Its such a pity we cant tune our cars. Ive tuned both of my FRS' on e85 and the difference is amazing. I haven't hit the dyno yet, but ive probably picked up about 50hp with just the tune and e85 on the horrible subi motor. I could only imagine what a 2ur would perform like with just a tune and good batch of e85.
Good point! I have no idea what is the optimal gasoline equivalent AFR for E85 for NA cars. For my WRX it was high 11's to low 12's.
I'm using 93 octane that contains 10% ethanol. I don't say it gain power but my F running smoother than ethanol-free 93 octane gas that I used to have. So far loving it.
I'm using 93 octane that contains 10% ethanol. I don't say it gain power but my F running smoother than ethanol-free 93 octane gas that I used to have. So far loving it.
Surprising as I see no difference between E free 90 and E free 93 other than the latter cost much more.
Is it safe to run this mix in our engines? I know a few stations with e85 and I have always wanted to squeeze a little in my car but I have always been hesitant I don't want to throw a rod. Won't our engines just tune it out anyways?
Last edited by Dupshaw123; May 11, 2015 at 10:30 PM.
Is it safe to run this mix in our engines? I know a few stations with e85 and I have always wanted to squeeze a little in my car but I have always been hesitant I don't want to throw a rod. Won't our engines just tune it out anyways?
Most of the time you throw a rod because of too much torque or running the engine to a really high rpm.
Lexus does not recommend more than 10% ethanol but the same can be say for GTR's, EVO's, STi's, BMW's, Audi's, Mazda's etc etc which most of them run 100% E85 on the stock fuel lines.
E85 vs 93oct
