87 vs 91 Octane tune - Chevy Impala SS Forum
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  #1  
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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1996 Buick Roadmaster Grand Sport wagon
LT1, Comp Cam, Comp Cams Pro Mag Full Rockers 1.6, custom headers, Bee Hive valve springs, LT4 valve covers, 3.73 Motive gears, Eaton Posi, 2400 stall, Front F-Body sway bar, Rear Hotchkis sway bar, Moog 5552 springs, Monroe HD shocks, 9C1 gear box, Z28 cluster, high-output alternator, 160F Thermostat, Bonnies, PCMForLess 93 Octane tune.
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Old 06-28-2010, 10:19 AM
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Fred Kiehl Fred Kiehl is offline
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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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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 Plenty of good parts
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Old 06-28-2010, 11:44 AM
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Scuba Steve Scuba Steve is offline
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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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black '96 Impala, 187K on the clock
ghetto rigged and hockey pucked intake, brake bolt, s-10 converter, shift kit, pcmforless tune, 3.73s, rust
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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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96 DCM - 355 LE2 - SS3600 - Bolt Ons - Hotchkis - 3.73 - Trifecta Tune
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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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1995 Roadmaster Wagon
1972 Ford LGT 100
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  #6  
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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1996 Buick Roadmaster Grand Sport wagon
LT1, Comp Cam, Comp Cams Pro Mag Full Rockers 1.6, custom headers, Bee Hive valve springs, LT4 valve covers, 3.73 Motive gears, Eaton Posi, 2400 stall, Front F-Body sway bar, Rear Hotchkis sway bar, Moog 5552 springs, Monroe HD shocks, 9C1 gear box, Z28 cluster, high-output alternator, 160F Thermostat, Bonnies, PCMForLess 93 Octane tune.
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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 Plenty of good parts
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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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1996 Buick Roadmaster Grand Sport wagon
LT1, Comp Cam, Comp Cams Pro Mag Full Rockers 1.6, custom headers, Bee Hive valve springs, LT4 valve covers, 3.73 Motive gears, Eaton Posi, 2400 stall, Front F-Body sway bar, Rear Hotchkis sway bar, Moog 5552 springs, Monroe HD shocks, 9C1 gear box, Z28 cluster, high-output alternator, 160F Thermostat, Bonnies, PCMForLess 93 Octane tune.
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Old 07-09-2010, 12:19 AM
RMC RMC is offline
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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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Rodger, Lorain, Ohio, 96 RMW, elect. fan conv. in work, Summit Turbos, OBD-I conv., 9C1 oil cooler, sewer-pipe/dryer-hose/Grant-horn-button intake, Monroe SS shocks, Air Lifts, Caddy rear bar, Pioneer DEH-P77DH & rear speakers, OEM Concert II front speakers, rear power adapters, hi-power back-up lights, removable 15 rear subwoofer plate... more to come
http://www.cardomain.com/ride/677551
My tuner: http://www.pcmperformance.com, forum member name AkNovaMan
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  #10  
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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1996 Buick Roadmaster Grand Sport wagon
LT1, Comp Cam, Comp Cams Pro Mag Full Rockers 1.6, custom headers, Bee Hive valve springs, LT4 valve covers, 3.73 Motive gears, Eaton Posi, 2400 stall, Front F-Body sway bar, Rear Hotchkis sway bar, Moog 5552 springs, Monroe HD shocks, 9C1 gear box, Z28 cluster, high-output alternator, 160F Thermostat, Bonnies, PCMForLess 93 Octane tune.

Last edited by dogma; 07-09-2010 at 11:21 AM.
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