Ford Performance Tune for 2018+ GT

[2018OFPP1?2]

Thats the whole point of E85, I use it as a cheap race fuel alternative. I run 3 gallons of E85 (true E85) and 12 gallons of 91.

No e85 near me, and I'm not really interested in voiding my warranty by running more than e15 anyway.

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[Dfeeds]

No e85 near me, and I'm not really interested in voiding my warranty by running more than e15 anyway.

The point wasn't to use a full tank of e85. It's to mix in with your regular fill up because you can't get e15 without mixing, at least to my knowledge. It's not voiding anything. I recall reading that e30 is the max you'd want to go, on the stock tune, without risking running too lean. Although you'd need genuine e85 for that.

Thats the whole point of E85, I use it as a cheap race fuel alternative. I run 3 gallons of E85 (true E85) and 12 gallons of 91.

E85 doesn't really give you a big octane bump, though. I don't even think your mix puts you at 93 octane. You'd need a lot of e85 than the tune may be compatible with. Not that it's a bad idea, though. 93 e15 will be more knock resistant than 93 e0.

Sorry to hear about your cat, that's a tough one.

I agree on the race gas. Definitely a difference, but man that stuff is crazy expensive now.

Thank you. I had her for 19 years so it's felt a bit empty around the house. And right!? I knew it was expensive but had no idea it was that bad. The leaded 112 octane was about $4 less a gallon. It's too bad we can't use it. I'm curious if one tank or two of 3 galons leaded fuel would actually cause any harm.

 

[Dave2013M3]

E85 doesn't really give you a big octane bump, though. I don't even think your mix puts you at 93 octane. You'd need a lot of e85 than the tune may be compatible with. Not that it's a bad idea, though. 93 e15 will be more knock resistant than 93 e0.



Thank you. I had her for 19 years so it's felt a bit empty around the house. And right!? I knew it was expensive but had no idea it was that bad. The leaded 112 octane was about $4 less a gallon. It's too bad we can't use it. I'm curious if one tank or two of 3 galons leaded fuel would actually cause any harm.

Not according to the calculator I use

 

[OF5.0]

The leaded 112 octane was about $4 less a gallon. It's too bad we can't use it. I'm curious if one tank or two of 3 galons leaded fuel would actually cause any harm.

The answer is yes. It does not take much of any catalyst poison to deactivate the precious metals in the catalytic converters. I highly advise against it.

 

[Dans18GT]

I'm on my second tank of running 3 gallons of e85 to a tank of 91. It definitely performs better.

 

[Dfeeds]

The answer is yes. It does not take much of any catalyst poison to deactivate the precious metals in the catalytic converters. I highly advise against it.

More so curious than wanting to try it. I've heard of people mixing leaded fuel on "race day" and have been okay so it had me wondering if it's a per gram thing or concentration level or something.

 

[Rpinaiii]

So I've been following the thread about gas. I never tried mixing. Since I already get 93 octane does it make any sense to try a couple of fill ups with 3 gallons of e85 added to 93? I will say I like the performance as is but willing to try the mix.

 

[2018OFPP1?2]

More so curious than wanting to try it. I've heard of people mixing leaded fuel on "race day" and have been okay so it had me wondering if it's a per gram thing or concentration level or something.

It's a cumulative thing. Run enough lead through a converter and it will die.

Also, per the owners manual, fuels containing more than 15% alcohol should not be used. Last time I checked, to get 95 octane by mixing e85 with 91 octane it resulted in ~e43.

 

[Dfeeds]

It's a cumulative thing. Run enough lead through a converter and it will die.

Also, per the owners manual, fuels containing more than 15% alcohol should not be used. Last time I checked, to get 95 octane by mixing e85 with 91 octane it resulted in ~e43.

That's the point I was making to Dave. E85 itself won't cause harm (as we see with all the e85 tunes cars) but the stock/FP tune may not have the right air/fuel ratio when running it. Although I have read about the stock tune adjusting for higher than e15. The unknown factor is what the FP tune will adjust for.

 

[Dave2013M3]

That's the point I was making to Dave. E85 itself won't cause harm (as we see with all the e85 tunes cars) but the stock/FP tune may not have the right air/fuel ratio when running it. Although I have read about the stock tune adjusting for higher than e15. The unknown factor is what the FP tune will adjust for.

I truly appreciate your advice and don't ever think I am discarding it. From what I have been told its really the E30 mark I have to be concerned with. What I may do is go back to my original blend which was 2 gallons of VP MS109 and 1 gallon of E85, or 2.5 gallons of VP101 (available at a pump near by) and 1.5 gallon of E85 every tank full.

 

[2018OFPP1?2]

That's the point I was making to Dave. E85 itself won't cause harm (as we see with all the e85 tunes cars) but the stock/FP tune may not have the right air/fuel ratio when running it. Although I have read about the stock tune adjusting for higher than e15. The unknown factor is what the FP tune will adjust for.

Although many do it with a tune, alcohol affects things other than A/F ratio. It's very corrosive to seals that aren't designed to handle it, and there are issues with water created by alcohol. For me personally, it's not worth the risk. I plan to have my car for a long time, and I'm not doing something that has potential long term to do damage. Ford says don't do it, that's good enough for me

 

[Rpinaiii]

Seems a little more complicated than just mixing fuels lol..

 

[Dave2013M3]

The key is to run straight gas in the fuel system every few tank fulls. Thats why I won't run straight E85...there is nothing wrong in running a few gallons of E85 in modern fuel systems. Don't let the car sit for long and flush it out with regular fuel every few tankfulls. Thats why I limit it max to 3 gallons as it gets me only to E24.

Dave

 

[Rpinaiii]

Does the car have to relearn the fuel mix each time it is changed back and forth? And does that take long?

 

[Davefzr]

Hey guys, got another dyno done after the initial install and dyno (https://www.mustang6g.com/forums/th...-tune-for-2018-gt.122943/page-39#post-2902710) to put this to rest on two fronts. One, the car has to learn and get accustomed to the new tune and Two, California fuel sucks. After running 93/94 octane fuel for several weeks, here are the results.

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