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Old 06-20-2011, 09:45 PM   #1
urdnotWRX
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Default High Altitude and ideal AP Octane Map

I've done some research on this and have found differing results. I live at about 6000' and normally run a Cobb base 93 Octane map on my AP, while running 91 octane premium with those small octane boost bottles (for 15 gal) from the gas station to boost my octane to I'm assuming > 93. First, what's an estimated octane boost that I should expect from those bottles (they don't give any indication on the bottle)? Second, am I okay to run 91 from the pump on a 93 map at this altitude? Is there a rule of thumb conversion?

Thanks!
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Old 06-21-2011, 04:46 AM   #2
project_skyline
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Do some logs and check to see if you have any knock.

What brand of octane boost is it? You should get a map made for your car specifically rather then trying to eek more power by running a 93 octane map on a 91 octane car.
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Old 06-21-2011, 07:33 AM   #3
fastblueufo
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Quote:
Originally Posted by urdnotWRX View Post
I've done some research on this and have found differing results. I live at about 6000' and normally run a Cobb base 93 Octane map on my AP, while running 91 octane premium with those small octane boost bottles (for 15 gal) from the gas station to boost my octane to I'm assuming > 93. First, what's an estimated octane boost that I should expect from those bottles (they don't give any indication on the bottle)? Second, am I okay to run 91 from the pump on a 93 map at this altitude? Is there a rule of thumb conversion?

Thanks!
Hell, at your altitude you could run 89 octane and probably not notice it lol. In all seriousness though, I'm not sure all 91 octane is actually 91 octane. I think cali 91 is really 87 with a 91 sticker on the pump
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Old 06-22-2011, 02:02 PM   #4
Cobb Tuning
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I would recommend running the 91 octane mapping if you only have 91 octane fuel available. We haven't done any testing with off the shelf octane boosters, but typically they will not add any significant octane points to your tank of gas.

- Ian
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Old 06-24-2011, 12:17 PM   #5
sc00ter
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Don't waste your time on those octane boosters. Since 91 octane is readily available here in CO while 93 is not, just be safe and run the 91 octane tune.

If you really want your car to run well with good power numbers, save the money you are spending on octane booster and use it to get a protune from Harvey (TheBoostCreep) instead.
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Old 06-25-2011, 09:09 PM   #6
urdnotWRX
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Thanks everyone,
I'm setting up something with them now.. I'm thinking of doing full exhaust + tune once I find a low and quiet setup I like, instead of spending the money on a stock tune and a few months down the road doing mods. That's mainly why i've been using the octane boost and holding off on the tune.
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