Help Needed. OFT v2 with E85. At race track - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

fminicooper · 02-23-2020, 12:08 PM

I am at Eagle Cannyon race truck. My buddy broke his car so I am sharing mine with him.
Problem I am running E85 and low in fuel.
Can I mix E85 with 110 race gas, and run E85 tune? The blend will be 70% E85 and 30% 110. Seems make sense for me but any comment is welcome.

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DarkSunrise · 02-23-2020, 02:14 PM

Should be fine. All that should happen is you will run a little rich until the ECU compensates by dialing back the fuel trims. Ignition timing should be fine since 110 has a higher effective octane than e85.

That said, I've never actually tried it so take that with a huge grain of salt. If you've got your OFT with you, I would datalog and keep an eye on fuel trims and knock.

EndlessAzure · 02-23-2020, 10:19 PM

The octane gives you the power benefit, but the Equivalence ratio won't be right.

It will help keep knock away, but you still need to burn more ethanol per unit air than gasoline. Mixing to a lower ethanol percentage will make the car run richer

fminicooper · 02-24-2020, 04:16 PM

If the car runs richer, Will ECU compensate the mix?

EndlessAzure · 02-24-2020, 05:53 PM

Quote:

Originally Posted by fminicooper

If the car runs richer, Will ECU compensate the mix?

I can't say how good the compensation will be, or how much it can trim based on Measured AFR only. Don't have a lot of experience there.

jflogerzi · 03-04-2020, 01:05 AM

After giving this thought its not a good idea. The tune is looking for e85 and even though the octane is very high, the tune is setup to to burn more fuel. This if you add race gas you got the octane number but you will need way less fuel to do so and the car will run like shit and super rich. So I hope in hind sight you did not push the car in that state. Yes the ECU can adjust but your fuel trims would be super out of wack

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CSG Mike · 03-04-2020, 02:13 PM

110 leaded? No; you will destroy your O2 sensor.

Clutch Dog · 03-04-2020, 02:36 PM

should reflash to a 91/93 tune and run that with your 110. or better yet get actual 91/93

i would never fuck with E with mixtures and Off the shelf tunes. unless it has the mighty flex fuel.

Tristor · 03-05-2020, 12:17 AM

Wish I’d seen this thread, I was at ECR at the same event in the white BRZ #93. If you’d come asked I had my car laptop with me and we could have loaded a 93 tune. There was 93 available at the track as well.

fminicooper · 03-05-2020, 02:42 PM

Hope I see you around next time. Normally I do HDPE in Houston. I couldn't run 93 tune since my gas tank was 3/4
I was sharing the car with a mate that broke his Mini, I was worry to run out of gas, or having fuel starvation (it happened to me at MSR CCW with half tank).
My idea was trying to add a cuple of gallon to be sure we have enought for both. Not brillant good idea as I see.
Finally the rain in the afternoon changed plans.
I was with the Hot Lava #735

02-23-2020, 12:08 PM	#1
fminicooper Senior Member Join Date: Dec 2017 Drives: FRS Hot Lava Location: Houston Posts: 114 Thanks: 82 Thanked 51 Times in 34 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Help Needed. OFT v2 with E85. At race track I am at Eagle Cannyon race truck. My buddy broke his car so I am sharing mine with him. Problem I am running E85 and low in fuel. Can I mix E85 with 110 race gas, and run E85 tune? The blend will be 70% E85 and 30% 110. Seems make sense for me but any comment is welcome. Sent from my SM-G892A using Tapatalk

02-23-2020, 02:14 PM	#2
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,794 Thanks: 2,164 Thanked 4,242 Times in 2,220 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	Should be fine. All that should happen is you will run a little rich until the ECU compensates by dialing back the fuel trims. Ignition timing should be fine since 110 has a higher effective octane than e85. That said, I've never actually tried it so take that with a huge grain of salt. If you've got your OFT with you, I would datalog and keep an eye on fuel trims and knock. __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

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02-24-2020, 04:16 PM	#4
fminicooper Senior Member Join Date: Dec 2017 Drives: FRS Hot Lava Location: Houston Posts: 114 Thanks: 82 Thanked 51 Times in 34 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	If the car runs richer, Will ECU compensate the mix?

03-04-2020, 02:13 PM	#7
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,530 Thanks: 8,920 Thanked 14,177 Times in 6,835 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	110 leaded? No; you will destroy your O2 sensor.

03-04-2020, 02:36 PM	#8
Clutch Dog Senior Member Join Date: Jan 2019 Drives: 2017 BRZ PP , 2005 Saab 97X Location: CA Posts: 1,052 Thanks: 754 Thanked 721 Times in 405 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	should reflash to a 91/93 tune and run that with your 110. or better yet get actual 91/93 i would never fuck with E with mixtures and Off the shelf tunes. unless it has the mighty flex fuel.

03-05-2020, 02:42 PM	#10
fminicooper Senior Member Join Date: Dec 2017 Drives: FRS Hot Lava Location: Houston Posts: 114 Thanks: 82 Thanked 51 Times in 34 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Hope I see you around next time. Normally I do HDPE in Houston. I couldn't run 93 tune since my gas tank was 3/4 I was sharing the car with a mate that broke his Mini, I was worry to run out of gas, or having fuel starvation (it happened to me at MSR CCW with half tank). My idea was trying to add a cuple of gallon to be sure we have enought for both. Not brillant good idea as I see. Finally the rain in the afternoon changed plans. I was with the Hot Lava #735

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