87 octane + meth? Need advice
01-20-2015, 07:44 PM
#1
87 octane + meth? Need advice [B][B]Well I am building a 95% street prochargedo trans am. Build thread is here:https://ls1tech.com/forums/forced-in...ld-thread.html
The only pump gas that is available in the town I live in is 87. I really don't want to have to drive 30 miles every time to fuel up or stock my own 91 octane fuel. 91 is the highest available within 60+ miles. My questions is with 10:11 CR and 15-18psi boost will 87 & methanol be ok to tune Up to 800-900rwhp?
The only pump gas that is available in the town I live in is 87. I really don't want to have to drive 30 miles every time to fuel up or stock my own 91 octane fuel. 91 is the highest available within 60+ miles. My questions is with 10:11 CR and 15-18psi boost will 87 & methanol be ok to tune Up to 800-900rwhp?
Last edited by josh4ku; 09-07-2016 at 06:37 AM.
01-20-2015, 10:04 PM
#2
Well I am building a 95% street turbo trans am. Build thread is here:https://ls1tech.com/forums/forced-in...ld-thread.html
The only pump gas that is available in the town I live in is 87. I really don't want to have to drive 30 miles every time to fuel up or stock my own 91 octane fuel. 91 is the highest available within 60+ miles. My questions is with 9.6:1 CR will 87 & methanol be ok to tune on up to so much boost after that just tune on 110 race fuel for race days?? Or will 87 not even be enough for cruising and mid throttle ?? If its absolutely stupid than i will just deal with it. I have a lot of money in this engine so I definitely don't want to be melting pistons because of fuel. My t4 turbo will probably max out at 800 rwhp I'm guessing. I would still like to run the car 600-700hp on the street.
The only pump gas that is available in the town I live in is 87. I really don't want to have to drive 30 miles every time to fuel up or stock my own 91 octane fuel. 91 is the highest available within 60+ miles. My questions is with 9.6:1 CR will 87 & methanol be ok to tune on up to so much boost after that just tune on 110 race fuel for race days?? Or will 87 not even be enough for cruising and mid throttle ?? If its absolutely stupid than i will just deal with it. I have a lot of money in this engine so I definitely don't want to be melting pistons because of fuel. My t4 turbo will probably max out at 800 rwhp I'm guessing. I would still like to run the car 600-700hp on the street.
Don't forget that you can also add Toulene or Xylene to 87 to boost the Octane. Be sure to post this in the "Forced Induction" section. They'll know if 87 is enough w/ meth.
Would assume that with low enough timing 87 is tunable.
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09-07-2016, 06:53 AM
#10
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your going to have to try it. Its all you can get , so you may need a 2.5 gallon meth tank in the trunk bc i bet you will be spraying any time your in boost so you will use a ton . But have to keep timing low and build it up .
Going to be a learning curve .
Going to be a learning curve .
09-07-2016, 07:24 AM
#11
Restricted User
Not only that, but it was for a ~2 second pull. Tires spun hard, I let off. Water/meth is the only reason it stayed together. I never said it ran well enough at 29 PSI to do it again.
If you run 87 with meth and try to stay in it for any amount of time, its going to start knocking hard. Sure, you could get away with a few pulls, but at some point its likely going to blow.
I just noticed you have a forged shortblock, which will definitely help. But if you're building a completely custom setup, why not get one that has a more 87 friendly compression ratio?
09-07-2016, 07:32 AM
#12
93 and water/meth, not 91.
Not only that, but it was for a ~2 second pull. Tires spun hard, I let off. Water/meth is the only reason it stayed together. I never said it ran well enough at 29 PSI to do it again.
If you run 87 with meth and try to stay in it for any amount of time, its going to start knocking hard. Sure, you could get away with a few pulls, but at some point its likely going to blow.
I just noticed you have a forged shortblock, which will definitely help. But if you're building a completely custom setup, why not get one that has a more 87 friendly compression ratio?
Not only that, but it was for a ~2 second pull. Tires spun hard, I let off. Water/meth is the only reason it stayed together. I never said it ran well enough at 29 PSI to do it again.
If you run 87 with meth and try to stay in it for any amount of time, its going to start knocking hard. Sure, you could get away with a few pulls, but at some point its likely going to blow.
I just noticed you have a forged shortblock, which will definitely help. But if you're building a completely custom setup, why not get one that has a more 87 friendly compression ratio?
09-07-2016, 07:59 AM
#15
Restricted User
Octane boosters really don't work as well as advertised, so be careful which one you pick. Some claim to be made of 110 octane race fuel, but adding a 12 oz bottle of 110 to 15 gallons of 87 MIGHT give you 88 octane based on test method.
Make sure you get a decent one. I've used the VP Racing Octanium a few times with good results. Its usually available at the local parts store but its not cheap. $25 or so for a 32 oz bottle. That added to half a tank of 87 should give you just over 94 octane (or so their octane report shows).
Make sure you get a decent one. I've used the VP Racing Octanium a few times with good results. Its usually available at the local parts store but its not cheap. $25 or so for a 32 oz bottle. That added to half a tank of 87 should give you just over 94 octane (or so their octane report shows).
09-07-2016, 03:39 PM
#16
Pretty sure you can just find some toluene locally (try paint supply stores) someone is bound to have it in cheap big barrels. I found some at a local tile place, they didn't even know it could be used as "gas" looked at me real funny when I asked how much I could buy at once to "burn" because it is also used to make TNT (i.e. Tri Nitro Toluene) and who knows what else