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87 Octane?

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Old 09-09-2014, 10:15 PM
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Car: 1991 Trans Am GTA
Engine: L98(5.7 L TPI)
Transmission: 700r4(A4)
Axle/Gears: G80 RPO, 3:23s, Auburn Racer's Diff
87 Octane?

So I accidentally put 13ish gallons of 87 octane into my 1991 L98. It's supposed to take premium fuel only. Should I just burn it off, or will I foul the engine and/or cause knocking?

I purchased some octane booster, but I should have added it to the tank BEFORE filling it up (so it mixes well, I guess). The other thing is that the octane booster doesn't give me a formula of how much I should add to the tank to achieve my desired octane rating. It just says "treats up to XX gallons."
Old 09-10-2014, 12:29 AM
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You may get a little ping if your setup is made to run premium only. Your knock sensor should take away most of it. I would personally just burn it off
Old 09-10-2014, 06:55 AM
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Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: 87 Octane?

I agree, just burn it off. Car's made to run on premium will run on the cheaper stuff, they just aren't as happy about doing it. A bottle of 104 octane boost would help.
Old 09-10-2014, 07:01 AM
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Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: 87 Octane?


Really...Did I just read that? Just drive the car and don't worry about it. If you would of put Diesel in it, you'd have a problem.
Old 09-10-2014, 10:50 AM
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Car: 1992 Z28 25th Anniversary
Engine: 350
Transmission: Automatic
Axle/Gears: Stock
Re: 87 Octane?

Drive it like you stole it. The ECM willl adjust to the octane.
Old 09-10-2014, 11:13 AM
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Car: 1984 Trans Am L69
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Re: 87 Octane?

Burn it off, if it really bothers you toss a bottle of octane booster in it
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