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87 oct. when tuned on 93

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Old Jul 4, 2017, 04:40 PM
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87 oct. when tuned on 93

Hey guys and gals,

I'm a bit pissed off right now.. So, in NJ, it is illegal to fill your own gas tanks, so they have people there that do it for you. My evo is tuned on 93 and I specifically asked for 93, but the guy put in 87. What should I do? Do you think its fine just for this one tank?

Thanks for any help.
Old Jul 4, 2017, 04:50 PM
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Yikes! Definitely stay off boost.

I would add in a half to whole gallon of E85 to bump the octane up. Or find an octane booster to add (like turbo 104). Definitely wait for tuners to chime in before you do this. Even after adding, I would drive until empty and refuel with premium and add octane booster one more time.
Old Jul 4, 2017, 04:54 PM
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You should be ok as long as you don't boost, which I know is very hard to fight the urge in a evo. Stick a block of wood under the gas pedal so it can't go down very far
Old Jul 4, 2017, 04:57 PM
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Originally Posted by ctfpevoVIII
Stick a block of wood under the gas pedal so it can't go down very far
Old Jul 4, 2017, 05:08 PM
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Octane booster might help, boostane/torco etc and stay out of boost.
Old Jul 4, 2017, 05:58 PM
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don't go full throttle and you will be fine. But don't be scared to drive it. When tank is empty fill it with 93 and then go full throttle. I have done that many times. The same applies if you leave the fuel in your tank for a long period of time.
Old Jul 4, 2017, 06:17 PM
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Why would you not bring a gas can to the station and have them put the gas in there instead. If it were me, I wouldn't want anyone else that close to my car.

This way you can pour it into your own tank.
Old Jul 4, 2017, 09:35 PM
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Originally Posted by Jp7
Why would you not bring a gas can to the station and have them put the gas in there instead. If it were me, I wouldn't want anyone else that close to my car.

This way you can pour it into your own tank.
I would... But ain't nobody got time for that..
Old Jul 4, 2017, 09:37 PM
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Originally Posted by ctfpevoVIII
Stick a block of wood under the gas pedal so it can't go down very far
Like it!
Old Jul 5, 2017, 01:58 PM
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Originally Posted by 2006EvoIXer
I would add in a half to whole gallon of E85 to bump the octane up.
Do not do this
Old Jul 5, 2017, 02:04 PM
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Originally Posted by 2006EvoIXer
Yikes! Definitely stay off boost.

I would add in a half to whole gallon of E85 to bump the octane up. Or find an octane booster to add (like turbo 104). Definitely wait for tuners to chime in before you do this. Even after adding, I would drive until empty and refuel with premium and add octane booster one more time.
Can actually add 1-2 gallons and it'll be fine, AFR's lean out to around 12 if the car is tuned for low 11's on gas. But the chemical properties of the E85 will make it safe.


Or dump a bottle of Torco in it.


Or stay out of boost for a whole tank of fuel.
Old Jul 5, 2017, 02:11 PM
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Isn't that just going to bump his effective octane to ~89? While also briefly affecting drivability as the computer has to relearn fuel trims?
Old Jul 5, 2017, 02:27 PM
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Originally Posted by butte
Isn't that just going to bump his effective octane to ~89? While also briefly affecting drivability as the computer has to relearn fuel trims?
2 gallons would get it to around 90, and then the fact that it's alcohol would help further. Still wouldn't bang on it, but the car would run better.
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Old Jul 5, 2017, 02:49 PM
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Good info
Old Jul 6, 2017, 01:50 PM
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Years ago I was in a dusty little village in Eastern Colorado and the only gas available was 85 octane. It was that or walk. It ran until I was able to obtain real gas. This would be about the same as 87 at lower altitude.


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