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Old 05-19-2004, 02:21 PM   #1
boxer02
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Join Date: Apr 2002
Location: illinois
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2002 WRX
Platinum Silver

Default 100 octane.... bad?

i plan on taking my car to the drag strip one week from sunday, and was considering my theory on higher octane is better. i typically fill up with 93 octane, no ethanol....
so, will running 100 octane in my car (2002 wrx) hurt it?

our ecu's takes a while to learn, so i was thinking of filling up with this a week before going to the strip up at cordova.

i'm not asking if its worth it, although with the recent spike in gas prices it might be....

i stopped by the local station and they had it listed at 3.60.....

i figure i'd run it for the week, then run it at the strip, then slowly start to mix 93 octane back into the mix
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Old 05-19-2004, 03:10 PM   #2
HoRo1
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100 octane won't hurt. I don't think that you'll see more than +1% extra power though.

$3.60 for 100 octane!
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Old 05-19-2004, 03:11 PM   #3
Skibum4444
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I run 100 when i go road racing. My Ecu is tunned so it will eat up anything i throw at it. But yeah your drag racing so make sure you dont have that much gas in your tank anyway. I dont get 93 octane anyway in my state so your running a little better anyway.

$3.60 for 100 octane Ha, in Washington last i paid was $5.30, and that was last summer.
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Old 05-19-2004, 04:20 PM   #4
boxer02
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yea, i figured w/ 93 being 2.27, the jump to 3.60 wasnt that bad.

there's only one station around that sells the 93 w/o the 10% ethanol in it, so thats were i always go to fill it up... luckily its right on the way from home to work....

so, no ill effects, means i'm gonna fill her up w/ it tonight....
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Old 05-20-2004, 12:25 AM   #5
WRXedUSA
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It'll be just fine. Remember in Japan and most parts of Europe, 98 is almost standard.
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Old 05-20-2004, 02:25 AM   #6
makofoto
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Japanese/Euro octane is lower then our rating ...

WRX ECU can probably only take advantage of up to 96 octane ... anything more is a waste.

Toluene is 114 octane ... cost about $6.50/gallon ... you need less of it ... so it's quite a bit cheaper.

To speed up ECU resetting, see Shiv's advice in this thread:

http://forums.nasioc.com/forums/show...hreadid=302047

If you are using 93 and 100 octane fuels ... you need to mix about half and half to end up with 96+ octane.

If you are using 114 octane toluene ... and 93 octane gasoline .... mix 1.5 gallon toluene and 4.5 gallons of 93 gas ... to get 6 gallons of 96+ octane.
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Old 05-20-2004, 04:24 AM   #7
PsychoSoldier
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Quote:
Originally posted by WRXedUSA
It'll be just fine. Remember in Japan and most parts of Europe, 98 is almost standard.
They use a different standard then the US.

European 98 is ~93 in the US.
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Old 05-20-2004, 02:18 PM   #8
deuce.five
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Tolulene? Yeahright!! Go for it, dude! See you at the warranty office! Go buy decent race-fuel and don't try and be a chemist with your $25K car. I use ERC race-unleaded with chevron super, about half and half, 110 octane, mixed with 92, yields somewhere around 100, pulls noticably harder on top-end. Probably only worth a tenth or two at the drags though....
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Old 05-20-2004, 03:48 PM   #9
makofoto
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24,000 miles and going strong ... I also have a Vishnu/Shiv dual EcuTek dyno tune ... to take advantage of the extra octane.

Here is a BP FAQ Sheet suggesting Toluene to increase octane. "Regular" gasoline has toluene in it ... we are just increasing the amount.

See No. 2 "How Can I Increase My Octane"

http://www.bp.com.au/products/fuelnews/faq.asp

Commercial Octane Booster is mainly Toluene ... just marked up a huge amount. And when they say it increase ones octane by say 5 points ... they mean .5 points! :-(

I add a bit of Marvel Oil for cleaning and lubing ... or some ATF and Kerosene.

Do a Search here for a lot more info.

Last edited by makofoto; 05-20-2004 at 04:55 PM.
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Old 05-20-2004, 04:52 PM   #10
dwx
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Quote:
Originally posted by deuce.five
Tolulene? Yeahright!! Go for it, dude! See you at the warranty office! Go buy decent race-fuel and don't try and be a chemist with your $25K car. I use ERC race-unleaded with chevron super, about half and half, 110 octane, mixed with 92, yields somewhere around 100, pulls noticably harder on top-end. Probably only worth a tenth or two at the drags though....
ERC doesn't make 110 octane unleaded gas, they make 110 RON unleaded which is 104 octane R+M/2. But still 104 octane mixed with 92 half and half is about 98 octane. There was a place in Chicago selling 100 octane for $2.71/gal which is like .30 more than 93... Around this area I can get 110 leaded for about $3.70/gal but nobody sells 100 unleaded except one place at about $4.00/gal.
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