The six cylinder cars, 3.4 or 3.8, were optimized to run on regular fuel. The higher octane fuel won't make them run any better, unless the heads are heavily carbonized and causing preignition. If the PCM tune is changed to allow more spark advance, the the higher octane fuel may give a little more power. However, there is point where additional spark advance will not provide additional power regardless of the fuel grade. Too much spark advance will actually decrease power, even if detonation is not present, because firing the plugs too early will, in extreme cases,try to spin the engine backwards. The octane needs of an engine are mainly determined, by compression, head design, and valve timing.

 

Hahahahahahahaha. 3.4 , 3.8
Take it the track
Reg ( 87 ) watch your time
Mid ( ? ) Watch your time on that run
Pre ( 93- 94 ) Look now
Racing gas (110 ) Tell me please
I know no one here put cheap parts or whatever & expect to run with big boys ???????????????????????????

 

yea switching from 87 to 110 is the same as gutting your cat. like 200 hp or more increase.

 

come on man the only way to make real hp is by using 5w-30 instead of 10w-30 good 100+ right there

 

can you imagin if you swiched oil and gas at the same time? omg. if gutting your cat means you can kill vipers just imagin what you can do.

 

this guy deff. uses 10 w 40.