octane question
RE: octane question
ORIGINAL: blackz87
And you are full of Bull Sh-t about the differences. In a v-6 it is awaste of money and in LT1 it will depend on the state of tune and if the ECM adjust to the lower octane.
ORIGINAL: evilkal
I disagree... I can tell a difference even in my 3.8L motor... The engine runs and idles much smoother and responds much quicker. It's untelling what the difference would be in a high compression engine like the LT1
ORIGINAL: blackz87
NO.....
ORIGINAL: red star
If i ran 91 would i even feel it?
If i ran 91 would i even feel it?
Newbie
Joined: Apr 2009
Posts: 15
octane and headgasket
i got a lt1 94 got it about 3 weeks now a low rpms it miss a bit exspecally when i use the cruise control i been useing the cheap gas should i use a higher octane and is there a way to tell what side of a headgasket has gone the car just bubbles over out the rad cap only when it get warmed up,i been useing 87 octane
Ninja Administrator
Joined: Jun 2007
Posts: 6,172
From: Potato
a stock engine set up for lower grades of fuel will not benefit from higher grades than it needs. and really... only highly modified or high compression applications will have any noticable difference from changin fuels. 90% of all cars and trucks made will not produce a single hp w/ 92 over 87, because the tunes of most cars and trucks do not have enough timing to reach the limits of 87 octane
the way fuel octane works is your engine requires a minimum octane rating in order to operate at its peak. using the other logic, if u feel a difference between 87 and 92, then there is a difference between 92 and 99. But there isnt. some cars require premium, and if you go lower than that the engine will begin knocking and pulling timing. but it shouldnt pull much if you are running a regular production gasoline, so were talking only a couple degrees and on a stock car that is too little hp to feel.
its placebo effect. thats why i say if he is getting a noticable difference then he should get other things checked out. his car is potentially knocking way more than it should. maybe carbon deposits turning into hot spots.... i dont know.... but the issue isnt just higher octane giving a kick in the pants. that doesnt happen
the OP has an lt1 which is higher compression and has a little more radical tune, so high grade is preferred. I still dont know that you would actually feel it... with the ammount of tuning ive done with my car, i can flip between all sorts of tunes and the only way to really know if it made a difference is to strap it to the dyno. ur butt-dyno can really mislead you
the way fuel octane works is your engine requires a minimum octane rating in order to operate at its peak. using the other logic, if u feel a difference between 87 and 92, then there is a difference between 92 and 99. But there isnt. some cars require premium, and if you go lower than that the engine will begin knocking and pulling timing. but it shouldnt pull much if you are running a regular production gasoline, so were talking only a couple degrees and on a stock car that is too little hp to feel.
its placebo effect. thats why i say if he is getting a noticable difference then he should get other things checked out. his car is potentially knocking way more than it should. maybe carbon deposits turning into hot spots.... i dont know.... but the issue isnt just higher octane giving a kick in the pants. that doesnt happen
the OP has an lt1 which is higher compression and has a little more radical tune, so high grade is preferred. I still dont know that you would actually feel it... with the ammount of tuning ive done with my car, i can flip between all sorts of tunes and the only way to really know if it made a difference is to strap it to the dyno. ur butt-dyno can really mislead you
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