Racing Fuel

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Apr 3, 2009 | 07:56 AM

GTA BANDIT

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Junior Member

Joined: Feb 2009

Posts: 28

Likes: 0

From: Chesterfield, Va

Car: 1991 Trans Am Gta

Engine: 350 Tpi

Transmission: 700r4

Racing Fuel

i have a 1991 trans am gta 350 tpi. i am going to the drag strip today and was wondering if i should run racing fuel in it or just run 93 octane with octane booster? also for just regular driving should i be using 87,89, or 93?

Apr 3, 2009 | 08:29 AM

calebzman

Senior Member

iTrader: (3)

Joined: Oct 2004

Posts: 805

Likes: 3

From: Charleston, SC

Car: '85 TA

Engine: 350 turbo

Transmission: T56

Axle/Gears: 3.70 posi 9bolt

Re: Racing Fuel

You do not need the extra octane of racing fuel or octane boosters since you don't have super high compression or power adders. With your engine, to stay away from knock & pinging, I would fill up with 93 for the track and daily driving.

Apr 4, 2009 | 01:33 PM

TKOPerformance

Supreme Member

Joined: Dec 2003

Posts: 2,391

Likes: 1

From: Newark, DE

Car: '86 Camaro, '02 WRX, '87 K5, '67

Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder

Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed

Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00

Re: Racing Fuel

Higher octane fuel than the engine needs to stay out of knock will actually hurt power and milage. Higher octane fuel is harder to ignite and burns slower, that's how it resists autoignition. You shouldn't need more than 93 octane, and even 91 is probably fine. New high performance cars are running over 11:1 compression and making 500HP on 91 octane pump gas.