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e85 and 89 octane mix

ARC

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#1
Hello,

Well versed advice needed.
Looking for lower cost option to get 93 octane.
I have a 93 octane tune and recently I have tried a mix of e85 and 89 octane.
I used equal amounts of 10 gallons each, so far no issues to report.
Will this affect the car long term?
I am in Illinois and we have e85 all over and at savings of .85 to 1.00 per gallon.
By using this blend I am saving quite a bit of money, just want to make sure it's safe.

Thanks
 

UNBROKEN

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#2
That’s not how it works. You need to pick an ethanol content you want and mix for that. You’re not turning 89 into 93. You’re turning 89 into E30 or whatever you decide. Your mix is closer to E50.
Get the E85 Mix app and figure your mix with that.
 

TMac

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#3
To expand upon what @UNBROKEN wrote, ethanol and gasoline have different timing and air/fuel ratios. While the ECU can compensate for some of this while you're just tooling down the road, with a tune should you go out and beat on it you're asking for trouble. It's not just an octane number.
 

OP
ARC

ARC

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Thread Starter #4
So looks like back to 93 octane only.
 

OP
ARC

ARC

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Thread Starter #5
That’s not how it works. You need to pick an ethanol content you want and mix for that. You’re not turning 89 into 93. You’re turning 89 into E30 or whatever you decide. Your mix is closer to E50.
Get the E85 Mix app and figure your mix with that.
I used the app and It was telling me that it was making e50.
So e50 is different than 93 octane?
 

UNBROKEN

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#6
I used the app and It was telling me that it was making e50.
So e50 is different than 93 octane?
Substantially different and you should have an E50 specific tune to run that blend. You can run as high as E30 on a 93 tune…you’re pushing your luck.
 

Stinger

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#7
I used the app and It was telling me that it was making e50.
So e50 is different than 93 octane?
E50 makes about 96 octane depending on the 91 or 93 you're using. E50 tunes are rowdy compared to stock.
 

Stinger

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#9
IF you’re tuned for it.
Yes. Thanks for clarifying to eliminate any confusion for those new to mixed fuels.


Sent from my iPhone using Tapatalk
 

OP
ARC

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Thread Starter #10
Just added the E50 tune to the tuner.
I will Install this week and will see if there is much difference.
I was told it will add about 15 to 20 horse over the 93 octane tune.
Went with the E50 due to the fact that in Illinois E85 is plentiful and would cost less than straight 93.
 

UNBROKEN

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#11
Not sure who’s tune you’re using but it’s way more than 15-20hp. My car went from 12.0’s on 93 to 11.7’s on E50.
 

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#12
Just added the E50 tune to the tuner.
I will Install this week and will see if there is much difference.
I was told it will add about 15 to 20 horse over the 93 octane tune.
Went with the E50 due to the fact that in Illinois E85 is plentiful and would cost less than straight 93.
I'm also from the Midwest in MN, plenty of E85's around but the problem is finding quality E85. I've been all over FB joining ST groups in MN to find out which gas station carries the best E85 and so far there's only one that's always around 80% to 85% based on their testing.

Not sure how big of a difference it'll make? I guess the guys that have been running E50 can chime in.
 

OP
ARC

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Thread Starter #13
Not sure who’s tune you’re using but it’s way more than 15-20hp. My car went from 12.0’s on 93 to 11.7’s on E50.
I'm sorry, I should have clarified. It is 15 to 20 over the 93 tune, or so I'm told.
 

UNBROKEN

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#14
I'm sorry, I should have clarified. It is 15 to 20 over the 93 tune, or so I'm told.
That’s what I’m saying…it’s more than that. You don’t pick up 3/10 with 20hp
 



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