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GM S3 100oct tune: meth instead of race gas?

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Old Feb 11, 2008 | 08:55 PM
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GM S3 100oct tune: meth instead of race gas?

for those of you runnng gm stage 3 i will attempt to run the 100 oct tune on meth inj instead of race gas... as you all know to much timing equals detination or knock and the gm ecm switches back to 93 oct once essesive knock is detected... has anyone tried this??? the meth being inj will be approx 120 octane...
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Old Feb 11, 2008 | 10:25 PM
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you spraying straight meth?
Im not too keen when it comes to the stage 3 computer.
But a member here named Roel SS tried it with little to no sucess. If hes still around maybe hell chime in, or you can pm him.
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Old Feb 11, 2008 | 11:38 PM
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From what i've read a 30/70 mix of meth with 91 octane puts you at 105 not 120 and just higher on 93oct.
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Old Feb 11, 2008 | 11:41 PM
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What kit are you going with?
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Old Feb 12, 2008 | 11:11 AM
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Originally Posted by lsjwannabe
What kit are you going with?
ais trunk mount

Originally Posted by Sw4y1313
From what i've read a 30/70 mix of meth with 91 octane puts you at 105 not 120 and just higher on 93oct.
ok. well that sounds like its plenty high enough to reduce knock so that the ecu stays in the more aggressive tune?

Last edited by hungryhip-ccp; Feb 12, 2008 at 11:11 AM. Reason: Automerged Doublepost
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Old Feb 12, 2008 | 11:11 AM
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no reason why it shouldnt.
as long as the computer detects no knock it will stay in high octane mode.



PS. dont use 100% meth.
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Old Feb 12, 2008 | 11:14 AM
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Originally Posted by shaunmcdee
you spraying straight meth?
Im not too keen when it comes to the stage 3 computer.
But a member here named Roel SS tried it with little to no sucess. If hes still around maybe hell chime in, or you can pm him.
no a 70/30 mix more water than meth works better, according to ais, honestly i dont see how it wont work! but who knows i'll find out v-day and i will post my results

Originally Posted by an0malous
no reason why it shouldnt.
as long as the computer detects no knock it will stay in high octane mode.



PS. dont use 100% meth.
i wont but do you know why that is bad?

Last edited by hungryhip-ccp; Feb 12, 2008 at 11:14 AM. Reason: Automerged Doublepost
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Old Feb 12, 2008 | 11:21 AM
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It has a boiling point of 64.7*C or about 147* F

heres an example of a problem...
I run a 50/50 H20 and Meth mix, and for the second summer I'm having occasional issues with boiling line fluid causing the pressure pump to cavitate. It happens when it is is ubber hot outside (105+) and the underhood temps skyrocket.

The only reason I'm posting this is as a heads-up to anyone running straight meth, which has an even lower boiling point than my mix. If you don't have a failsafe and/or a primer pump to keep the feeder line under pressure, be careful when it is really hot outside - your pump may not be able to get any juice to the injector.

Note - this problem increases with altitude. Beware
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Old Feb 23, 2008 | 02:08 PM
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Did you ever find out a good mix, what did you end up running? Did it stay in 100 octane mode or kick it out?
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Old Feb 23, 2008 | 09:14 PM
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There was another thread made where it was successful. Search button FTW =P
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