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Old 07-30-2017   #1
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Join Date: Jul 2015
Posts: 16


What gas should I be using in my 88 GTA 5.7?
What octain?
With or without ethanol?
What manufacturer?
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Old 07-31-2017   #2
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Join Date: May 2017
Location: Ottawa, ONT - cool town!!!
Posts: 33

Re: Fuel

I think it starts to come down to availability to a point, what gas stations are near you or the most convenient for you. Unfortunately ethanol is becoming almost standard across the board it seems, so it gets hard to avoid it. I just always try to use the highest octane I can get from a pump, here thats ultra 94. I figure cause I don't drive it too often, as octane decreases as it sits, when I do drive the car the octane won't have fallen to 50. LOL
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Old 07-31-2017   #3
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Join Date: Mar 2015
Posts: 280

Re: Fuel

While my lowly T/A has an even more lowly L03, it is 9.3:1 C/R. And I think that's pretty on par, if not even a touch higher, than the L98. I use 87. Runs fine. If I know I'm going to be stuck in some really hot conditions, I might go 89 or 92, but most of the time regular gets the job done.
1988 Pontiac Trans Am
POCI #72200
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Old 08-02-2017   #4
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Join Date: Jun 2004
Location: Ravenna, OH
Posts: 1,948

GTA Year: 1987
GTA Engine: Custom
Re: Fuel

87-94 octane would be fine.
87 GTA: Forged 408 LSX short block, TEA stage 2 cnc ported 243 heads, BTR Stage 3 stroker cam, Fast 102 intake, NW 102 TB, Longtube headers, custom 411 ECM, custom harness, custom tuned, Performabuilt stage 2 4l60E with PTC 2800 stall, 9 bolt rear with 3.70 gears and TAP girdle.

11.16 at 123 mph.
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