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 Old 03-29-2012, 02:40 PM   #1
 
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Default benefit of running higher octane on a 91 map

Someone at my local auto parts store told me yesterday that running higher octane gas will give a notable improvement in power, even without tuning for it. I was under the impression that, unless you're getting knock, running higher octane doesn't make any difference. In order to get the benefits of, say, 101 fuel at the track, you have to tune for it (i.e. adjust timing).

Will running 101 (unleaded of course) on my 91 octane map give me improved performance. I've got very little knock even at WOT with my tune.
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 Old 03-29-2012, 02:50 PM   #2
 
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Unless you tune for it there's no point in going over 91 octane (on a stock or 91 octane map). Only reason for going higher octane is for using a more aggressive tune without getting knock. If you're not getting knock on 91 octane you're not going to get it on 101. Your ECU will adjust to combat knock, but it isn't going to go "oh man...higher octane...better up the powa on this bish" without you telling it to.
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 Old 03-29-2012, 04:26 PM   #3
 
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That's what I thought, and what I told the guy. He was so adamant I 2nd guessed.
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 Old 03-29-2012, 04:28 PM   #4
 
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Yeah unless you are planning on running a spiceytune by Cobb then running any higher octane then needed is unnecessary, and is a waste of money.
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 Old 03-29-2012, 04:33 PM   #5
 
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Higher octane fuels are actually harder to ignite. You can see a decrease in performance by running an octane higher than you're tuned for. Parts store guy doesn't know what he was talking about.
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 Old 03-29-2012, 06:03 PM   #6
 
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thats why you never listen to an auto store employee. you go in for brake lines and they give you heater hose and say itll be fine


also, i was at a dyno day once with a bunch of supras and one kid wanted to be cool and have crazy numbers with race gas. he dynoed on pump and then filled with race gas and his numbers dropped like crazy lol...we laughed at him
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 Old 04-07-2012, 03:47 AM   #7
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putting higher octane without a tune will hurt performance.(unless you are knocking pretty bad)
101 will run richer and that can cause knock as well.
To take advantage of race gas you need leaner afrs and advanced timing.
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 Old 04-08-2012, 10:10 AM   #8
 
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Ok, thanks for all of the input, peoples. The highest octane pump gas I can regularly get is 91. Do any of your reccommend an additive to reliably boost octane so I could reliably dial in one of the Cobb OTS 93 maps? Related; Would it be reasonable to try to tune for 93 with gas+additive that may be 94 to 96 or something? Just as long as it is over 93 and not a lot higher?
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 Old 04-08-2012, 10:14 AM   #9
 
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Originally Posted by SpeedCheese View Post
Ok, thanks for all of the input, peoples. The highest octane pump gas I can regularly get is 91. Do any of your reccommend an additive to reliably boost octane so I could reliably dial in one of the Cobb OTS 93 maps? Related; Would it be reasonable to try to tune for 93 with gas+additive that may be 94 to 96 or something? Just as long as it is over 93 and not a lot higher?
e85. dont bother with additives.
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 Old 04-08-2012, 10:22 AM   #10
 
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In the long run it would be better to get a custom tune for the 91 octane. Performance will be much better than any ots map.
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 Old 04-10-2012, 10:24 PM   #11
 
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Unless of course, your in teh same boat i am, and the only octane available from any pump in your entire STATE is 90.....

I wait until i get a gas light, then i fill. Roughly every 2 weeks, daily driven and all.
I fill my car with 4 gallons of Sunoco Super GT Plus 104 unleaded, and then usually squeeze in about 8 to 9 gallons of pump Shell 90.

That combo right there allows me to run a Stage 1 93 octane map without any KR what-so-ever. Still experimenting on a bit of timing advancement, and so far 2 degree's past OTS and no knock yet.

Reason i run the 93 is mainly because, no one else here bothered to mention , another downfall of running a higher octane than tuned for, you start to get really high EGT's.
So yea, running the 93 map seems to work for me like a champ.
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 Old 04-10-2012, 10:31 PM   #12
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Every car is different and after tuning 60+ speeds 91 octane in one area is the not the same as another. Sooo ... if you have KR you want to either get higher octane or to change the tune if it's not available.
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