octane rating
#11
Join Date: Jul 2007
Location: South Georgia/East Florida
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Most of the newer engines are "factory tuned" to perform with specific octane gasolines. Although it's perfectly fine to use a higher octane fuel than is called for, in many instances you will not get any benefit from it. You'll have to experiment with it. If you run smoother or have a clear mpg benefit with the higher octane, stay with it. On the other hand, NEVER use a gasoline with a lower octane rating than is called for. As the 'dog said, detonation (knocking & pinging) is very bad for the engine...
#12
Most of the newer engines are "factory tuned" to perform with specific octane gasolines. Although it's perfectly fine to use a higher octane fuel than is called for, in many instances you will not get any benefit from it. You'll have to experiment with it. If you run smoother or have a clear mpg benefit with the higher octane, stay with it. On the other hand, NEVER use a gasoline with a lower octane rating than is called for. As the 'dog said, detonation (knocking & pinging) is very bad for the engine...
#14
ive done the real world test on the RAM by running 3 gals of 87 and then 3 gals of 93. i got the gas in 2 separate fuel containers and ran the RAM til the fuel light came on and then filled it first with the 87 then ran it till the light came on and then filled the 3 gals of 93. the fuel was from a shell station.
like Hammer said, running lower octane than recommended used to kill engines. many modern engines (including the ones on the ram) have knock sensors. running lower octane causes the engine to knock/detonate/ping and the ocmputer retards the timing to stop it. you won't damage the engine, but you do end up losing power/economy. .
running a higher octane tahn recommended does not benefit you unless you are deliberately advancing timing (powerwire, superchips, diablo...) past what the engine would normally do.
also, the only time you will really get detonation is startup, high load low speed (bogging), or when you're flooring it. avoid thsoe situations, and 87 will work just as well for you as 89.
#15
so any sugestions
so when I have to use 95 oct. (that is the lovest oct I can get here.)
I am not getting all the benefits I can out off this gas?
I should be able to adjust the timing on my 2002 5.9 ram!
Is there any way to do that?
I have the superchis and run at the time the miage XS program cause this seems to give me more mileage than the 91 oct program.
I am not getting all the benefits I can out off this gas?
I should be able to adjust the timing on my 2002 5.9 ram!
Is there any way to do that?
I have the superchis and run at the time the miage XS program cause this seems to give me more mileage than the 91 oct program.
#16
so when I have to use 95 oct. (that is the lovest oct I can get here.)
I am not getting all the benefits I can out off this gas?
I should be able to adjust the timing on my 2002 5.9 ram!
Is there any way to do that?
I have the superchis and run at the time the miage XS program cause this seems to give me more mileage than the 91 oct program.
I am not getting all the benefits I can out off this gas?
I should be able to adjust the timing on my 2002 5.9 ram!
Is there any way to do that?
I have the superchis and run at the time the miage XS program cause this seems to give me more mileage than the 91 oct program.
DO NOT run 85 octane with performance tune. your engine will hate you for telling it to advance timing and then giving it fuel that knocks when you advance.
#17