100 octane offroading
CF Veteran
Joined: Jun 2010
Posts: 2,501
Likes: 4
From: Flint/Asheville
Year: 1995
Model: Cherokee
Engine: 4.0 HO
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
You run the risk of ruining the catalytic converter by running too high of an octane rating. The higher octane fuel burns slower and you will actually dump unburned fuel into the exhaust. Waste of money and it could be damaging too.
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CF Veteran
Joined: Jun 2009
Posts: 2,173
Likes: 0
From: Columbus, Ohio
Year: 1997
Model: Cherokee
Engine: 4.0, comp cam, 99 intake, apn header, neon injectors, Thunderbolt 2.5" High Flow Cat
It's not about new... Higher octane fuel burns cooler and makes less fire than lower octane. Racing fuel is for engines with absurdly high compression numbers. It's purpose is to burn cooler for less fuel ping. The compression ratio may increase the horsepower of a motor... but the race fuel actually lowers it.
CF Veteran
Joined: Jun 2010
Posts: 2,501
Likes: 4
From: Flint/Asheville
Year: 1995
Model: Cherokee
Engine: 4.0 HO
High octane is only for high compression motors to reduce pre-ignition. So anything lower than ~9.4:1 ratio is fine with regular 87. Some do run alittle higher octane if they have issues with engine knock
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