100 octane offroading
04-10-2012, 11:00 PM
#6
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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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04-11-2012, 08:55 AM
#8
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Year: 1998
Model: Cherokee
Engine: 4.0
it would have 2 have highcomp pistons and a decked block atleast id think a big cam and some head work also 2 make it worth while
04-11-2012, 09:12 AM
#9
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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.
04-11-2012, 10:32 AM
#11
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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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