Nick is right..... - Saab Performance Bulletin Board - Saabnet.com
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Nick is right.....
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Posted by DrewP [Email] (more from DrewP) on Mon, 23 Aug 2010 09:09:38 Share Post by Email
In Reply to: Re: There are many ways to achieve performance, that's, Landjet [Profile/Gallery] , Sat, 21 Aug 2010 19:20:26
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Higher octane fuel will absolutely make a difference, IF you dial the car in to take advantage of it, either with adding more timing, or adding more boost. If you don't change anything in the setup or the state of tune it'll run exactly the same.

The energy content is almost exactly the same, it's the fuel's ability to resist detonation and different flame speed that gives you the potential increase in output.


Most of the boosters you can get at the store are misleading by how much they claim to raise octane - usually they reference a certain 'point increase' in the octane rating, but if you read it carefully the rating system they use is equivalent to 1/10th of a point of octane at the pump, so a bottle of '12-point-increase' booster in a tank of 91 octane could yield you something like 92.2 octane - not much of an increase.

You'd get about the same increase from putting in a gallon of 100 octane for every 9 gallons of 91 octane:

((9 * 91) + (1 * 100)) / 100 = 91.9

....and it'd probably be cheaper, those little bottles of booster are usually $7-$10 if I remember correctly.


Remember that leaded racing fuel can damage the oxygen sensors and the catalytic converter, but the highest grade unleaded race fuel is usually something like 104 octane.

Best,
Drew

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