Kilgore Trout said:Your "study" was hardly scientific and your "results" are anecdotal at best.
Anyway, for the stock tune best to use 87.
In any case, use the lowest octane your can use without getting detonation.
Sorry, but you are wrong. There is enough difference that it will affect your 1/4 mile times and dyno numbers. You should run the lowest octane called for by the manufacture unless you are getting detonation or have upped your timing.40oz said:That might sound good, but it makes no sense. Once the spark fires, it all burns. Octane rating only means it takes a higher pressure to ignite without a spark. It doesn't mean they added dirt and water to make it burn poorly :/ Higher octane gas might indeed have less energy per liter than say, 87, but the difference is so minimal you could make it up by cleaning out your glove compartment. A bigger issue concerning energy density would be oxygenated fuels used in the winter in most cities. Oxygenated fuel has less energy than non-oxygenated fuels, per liter, and you will get noticeably worse mileage.
AFAIK, the flash point of a fuel is unrelated to the amount of energy it stores. And octane has nothing to do with the speed at which the flame front propogates.
All gasonline isn't the same once you include additives, so one brand's 87 might knock, while another brand's doesn't. Every station in an area might get their gas from the same refinery, but use different additives to get the octane numbers they sell.
jimfitzgerald said:Sorry, but you are wrong. There is enough difference that it will affect your 1/4 mile times and dyno numbers. You should run the lowest octane called for by the manufacture unless you are getting detonation or have upped your timing.
jimfitzgerald said:Sorry, but you are wrong. There is enough difference that it will affect your 1/4 mile times and dyno numbers. You should run the lowest octane called for by the manufacture unless you are getting detonation or have upped your timing.
With my tunes, I run 93 on the street and 116 at the track.mrvax said:This is correct.Unfortunatly for me, I do have to use 93. I have advanced my timing and headswaped into ~ 10.5:1 C/r.
Premature explosion of fuel in the cylinder. It sounds like marbles rattling around in a can. It can cause severe damage to your engine.AmBo said:Excuse the RETARDED question, but what exactly IS detonating?
AmBo said:Excuse the RETARDED question, but what exactly IS detonating?
dustang50 said:BP gas is crap. I've been told by my Ford dealership to steer clear of the big green...
After tuning my car I've had to use 91+ octane. It "seems" that my car runs better on Shell & Sunoco, but I think it's all in my head...
reddrgn01gt said:Bp uses amoco fuels. I use the 93 all the time with my predator and have never had an issue. In fact diablosport recommends that you use amoco fuels or another quality brand on their web site. So i would have to disagree with them saying it sucks.
dustang50 said:BP gas is crap. I've been told by my Ford dealership to steer clear of the big green...
After tuning my car I've had to use 91+ octane. It "seems" that my car runs better on Shell & Sunoco, but I think it's all in my head...
jimfitzgerald said:Sorry, but you are wrong. There is enough difference that it will affect your 1/4 mile times and dyno numbers. You should run the lowest octane called for by the manufacture unless you are getting detonation or have upped your timing.
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