what is the highest octane you can run safely?

 

110 bishes!

 

ive heard of 103 at the pump. but id say 110 you could run and would be like running jet fuel.

ryan.

 

93. I mix a bit of 104 in at the track if my low fuel light comes on. But thats all i would do unless you are tuned for a higher octane.

 

You know if your pcm/computer is tuned for a certain octane, anything more is just a waste of $cash$. If your lucky you may see a very small gain.

 

octane is totally overrated.

 

What is up with these posts about octane always seeming to come in groups?

Running higher octane does not give you more power. The only way running higher octane gives you more power is if your car is tuned for the higher octane by running more timing. If you run 87 and get knock - run some 89. If you run 89 and get knock run 91. If you run 91 and get knock run 93. So on and so forth. If you have no way to measure knock then you have no reason to run higher octane then what the car is rated for. You MAY get slightly higher MPG using higher octane - but is that 1 MPG increase worth the $.10 more you pay. I would guess not. Also by running higher octane then what the car is designed to run on you are actually causing MORE polution. Yes MORE! This is because octane makes the gas harder to ignite. If it doesn't all ignite it goes out the exhaust, then *VIOLA* greenhouse gases out the ass.

If you have a 2.2 run 87.
If you have a 2.4 run 91 if you like to run hard and 89 or 87 if you don't.
If you have a 2.0 I would never run lower then 91 although stock you *could* run 87.

 

The only time running a higher octane would be good is if your running something like SHELL V-POWER because its like an injector cleaner.

 

Try it out a couple of tanks of higher octane. You'll change your viewpoint.
I sure as **** know that my car runs better on 93 octane than that crap juice the dealer put in there.

 

The highest octane from tier1 stations available to normal consumers in california is 91, however even with 91 im running 4-6 degrees more timing in most areas of my spark tables then the stock calibration.

AGAIN, octane is over-rated. if your not using it right, your just burning money... or call it insurance for a testy high CR... who cares... its your car..

 

octane is relative to efficiency, the more efficient, and therefore hotter burn, the more horsepower you WILL get. there is a point where it becomes over kill, and this would be the 103 and above point, unless its required for timing.

running 93 bor 94 octane on a stock ss will make it much smoother, and you will see response and some hp gains... you'd have to be blind and deaf to not notice.

 

hell I had some VP C11 in my car 106motor octane = about 110 @ the pump.
Its leaded and wow was it smoothe and smelled good and worth somthing on the butt dyno too.

 

octane isnt relative to efficiency! Octane is used to keep the fuel from preiginiting from being injected into a hot cycender and being compressed to 10.4:1. yes there is a point where it becomes overkill without tuing more timing.. and thats 91

here, go read: http://auto.howstuffworks.com/question90.htm

 

more timing or boost actually.

and it does have efficiency in it. Go to the dealer, have them remove the injector housing and throttle bodies of 2 cobalts, one running only 87 and one running only 91 , the 91 will be in alot better shape, have less ware on th engine overall, less build up, and you will see an advance in horse power. Our cars have a high and low octane map built in.