87 vs 91 Octane tune - Chevy Impala SS Forum
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Old 06-28-2010, 09:21 AM
dogma dogma is offline
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Default 87 vs 91 Octane tune

What's the difference between 87 and 91 Octane tunes?
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Old 06-28-2010, 10:19 AM
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I do not know for certain, but I would presume the timing is more aggressive for the 91 octane tune. I base this on the antiknock qualities of the higher octane fuel.
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For a parts list, check http://www.impalassforum.com/vBullet...1#post11609553
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Old 06-28-2010, 11:44 AM
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I've always been curious about the hp or quarter mile time differences between the two on a similarly set up car
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Old 06-28-2010, 01:19 PM
sdotlog sdotlog is offline
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I'm interested to know as well.
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Old 06-28-2010, 07:23 PM
kiddpitt kiddpitt is offline
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I had my tune done in person by pcm4less, I asked and was told the premium fuel tune was worth about 10hp
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Old 07-07-2010, 02:08 PM
dogma dogma is offline
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Do you get better MPG with it?
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Old 07-07-2010, 06:25 PM
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You get better gas mileage with the 87 octane, because it has less additive, and more actual gas.
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1991 OCC upgraded LO5, LT1 cam, 46mm TBI, bored intake manifold, wrapped headers, true duals w/Flowmasters, 3.23 posi, flash to pass, drop spindles & springs, custom fender skirts, stainless full moons, Recaros, Blazer console, Nardi/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, SS wheels. DEH P77DH
For a parts list, check http://www.impalassforum.com/vBullet...1#post11609553
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Old 07-08-2010, 03:44 PM
dogma dogma is offline
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I think I will go with 87.
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Old 07-09-2010, 12:19 AM
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Quote:
Originally Posted by dogma View Post
I think I will go with 87.
I am running the 87 octane tune from PCMPerformance.com and noticed a significant increase over stock.
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Old 07-09-2010, 08:59 AM
dogma dogma is offline
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Interesting... But doesn't high compression LT1 demand at least 90 Octane?
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Last edited by dogma; 07-09-2010 at 11:21 AM.
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