sunrise_mj

higher octane in a motor not designed for it will kill your gas milage... so yea... save your money...

also, once you go to high octane, then go back to 87, you're gonna love the "custom" knocks and pings the motor will make

b-spot

Hahah I can't believe you guys. This forum makes me feel so smart.

You are all right though, science doesn't apply to your cars, 93 makes them FAZTERZ!!!! LOL!!111!!!1!!one!!11!!!!

CJ Thunder

Yeah that's what I thought, octane can't give you power your engine can't already make. I was just asking about the 105 for FI applications...

I read a couple of articles that all say it only matters in FI cars.

korax123

a stock or bolt-on 2.2 does not need 93 octane you are wasting money. 87 octane is what you need for the best performance. Get a g-tech run 1 tank of 87 octane do 6 runs take the average. When your tank is almost empty put in 91-93 octane do some 0-60 runs with the same amount of gas left in the tank when you did it with 87 you won't see much of a improvement or go slower. Times will very depending on weather and how good you launch the car.

Mike's SS

Use gas with just enough octane to quell spark knock, no more, no less, that is how to get the best power out of gasoline.

Brian MP5T

Any Situation where High Compression and Detonation are issues.

FI increases the total compression of the motor as the charge varies. Too Much and you get detoantion with too low of an octaine rating.

It's supposed to be a safeguard to allow high compression engines to run properly with less risk of detonation.

dnbguy86

Actually, a higher octane doesnt kill your gas mileage, its a slower burning fuel, it might not per say give you extra mileage, but because its slower burning you might drive the same miles per tank, but might take an additional day to go through the rest of the fuel. End of discussion, it DOES NOT give you any additional performance, end of story !

Blk05Cobalt

x2 smart man

b-spot

Higher octane gas has less energy per volume than lower octane gas (because octane takes up volume), so therefor it gives worse fuel economy.

redlineblueline

Gasoline is a myriad of organic compounds octane is only one of them. Octane is 8 saturated single carbon-carbon bonds in a chain. Othe rchemicals in it are solvent-100 (Which gives it its smell), butane, propane, ethane, ethlyene, and some organic alcohols and acids. So from tank to tank these chemicals' concentratons vary. One tank of 93 octane may have more than another. Different brands also put different detergents and carbon removers in them. The carbon removers make sure that the combustion reaction carries all the way to completion so that the Kd is higher for the reaction. Since combustion is Hydrocarbon (Carbon Hydrogen Oxygen) + O2 -> CO2 + H20 these additives make sure that all of the CHO burns and doesn't produce solid carbon as a by-product. Octane boosters are supposed to be "pure" octane but octane evaporates far to quickly to be pure in the bottles.

dnbguy86

Ok, that maybe true, but still 93 octane is still slower burning than 87 octane, therefore it'll take longer to burn 10gal. of 93octane than 87 octane. Plz try to validate your reply a lil' more if your gonna try and insult my intelligence. k thanks.

cobss187

your an idiot i hope ur cat gets plugged up

Skottish

ok.....let me try to get this point across......it burns slower.....ok...try to wrap ur brain around this....it doesnt burn in the tank, in which case yes, 93 would last longer than 87, but it doesnt....your fuel pump pumps it into your engine....the fuel pump, regardless of octane, is going to put the same amount of fuel into the engine....it all depends on the air flow in order to have the proper air/fuel mixture.....now....that given...you are still going through the same amount of fuel, only now not all of it is getting burnt.....so that excess fuel is going out the exhaust manifold and going to waste.....

dnbguy86

Ive already said what i needed to get my point across, if you dont understand the concept of anything were talking about maybe you should research it first, not trying to talk ****, but before you jump on the bandwagon and think you know what your talking about, try to at least have a intelligent point to convay.