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Old 01-11-2005, 12:41 PM   #1
erggy
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Default tune settings with higher octane

Just wondering if i need to watch out for anything. I'm about to go for track day with my car tune for octane 95. but at track day I'm going to put some octane booster in. Would this cause any harmful (adverse) affects to my tune settings (fuel and ig. timing)? So I can monitor on my a/f

If so, please recommend me on what I should do before going to track day. Thank you
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Old 01-11-2005, 01:04 PM   #2
hippy
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You might not want to add octane booster unless your car needs it because of a more agressive tune(like more agressive timing, boost, less fuel or whatever). Raising the octane level might just make your car go slower(without tuning for the higher octane), and the additives in the octane booster probably aren't that great for your car(so why use them if the car might just go slower). As always, this is just my opinion.......

peace
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Old 01-11-2005, 01:14 PM   #3
erggy
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thanks for the reply!! Assuming the tuning remains the same.. only thing that changes is the octane level? How/why does it make the car go slower? Something to do with the ignition timing?

Just wondering if increasing octane level (additives) can cause harm to a lower ocatane tune settings


thank you
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Old 01-11-2005, 01:21 PM   #4
hippy
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Imagine adding a half a gallon of coolade to the gas you have(with lets say 14.5 gallons of gas just as an example). Not thinking to far into it(with what kinda damage would happen by puting coolade/water in the gas), we'd be diluting the fuel(by about 3.3%). Without taking advantage of the extra knock protection of the super coolade blend(by upping the boost, advancing the timing, or using less fuel), we'd end up losing a little power. That's the way I see it anyways.

A lot of the time when ya raise the octane level of a fuel(or just using higher octain fuel), it ends up making the fuel burn slower which also makes the combustion cooler(because of less cylinder pressure). Since the timing and everything else is set for a fuel which burns quicker/hotter, the slowing and cooling of the burn usually ends up hurting the power output if nothing is done to take advantage of the extra octane. Disclaimer time... As always, this is just my opinion from what I've seen/heard and I'm no expert.

peace

Last edited by hippy; 01-11-2005 at 01:26 PM.
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