pump gas limit without methnol
TECH Enthusiast
Joined: Jan 2004
Posts: 608
Likes: 0
From: New Zealand
you could probably run #15 boost, but you wouldn't get much timing in it at the top end and would need to run reasonably aggresive IAT spark retard at higher intake temps.
Don't know why people are scared of meth,
A well setup system is reliable and and can have failsafes built in, and will allow you to safely run a decent amount of boost/timing without detonation.
Don't know why people are scared of meth,
A well setup system is reliable and and can have failsafes built in, and will allow you to safely run a decent amount of boost/timing without detonation.
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600-650rwhp I think would be safe, I think 700rwhp would be a push.
I was 8:1, 347 cid, turbo, and went 10.00@139 mph on 16 psi without really trying to run a big number.... I'd say that was 650 rwhp @ 3400 raceweight.
I was 8:1, 347 cid, turbo, and went 10.00@139 mph on 16 psi without really trying to run a big number.... I'd say that was 650 rwhp @ 3400 raceweight.
My turbo 404 trapped 156mph on 14psi with 93. Your head, cam, IAT, and tune and so much to do with how much power you can make on pump gas. I would 110% suggets running meth with crappy 91.
U sly.. 
On The Tree
Joined: Aug 2005
Posts: 152
Likes: 0
From: St. Petersburg, Florida
Being around the detonation thingy long enough.. Easy way is to spray meth on top of a good tune.. let it drop some afr.. and then add in a bunch of timing.. locate the IAT after the meth nozzle.. and if temp goes up.. cause there is no meth spraying.. yank timing like crazy.
This is a win win scenario.. you drop afr from 11.5:1 to 10.5:1.. and increase timing from lets say 12-14 degree's to 18-20. You pickup power and if the spray doesnt work.. your back to where you started at with the crappy low timing.
But I know this is off subject.. trying to make power on low octane fuel and keep doing it is not for everyone. Typically to build a motor to accomplish this costs 4x the cost of any meth kit. If you have the dough.. buy the heads, big cam, build the motor, etc.. once oil starts creeping into the combustion chamber cause your driving it around.. that motor will not be as friendly with the low octane fuel. Let alone the CA 90 octane with up to 10% ethanol
Big difference when dealing with pistons with crud on top of them vs a brand new motor making 3 second dyno pulls with a fan blowing in front of it.
This is a win win scenario.. you drop afr from 11.5:1 to 10.5:1.. and increase timing from lets say 12-14 degree's to 18-20. You pickup power and if the spray doesnt work.. your back to where you started at with the crappy low timing.
But I know this is off subject.. trying to make power on low octane fuel and keep doing it is not for everyone. Typically to build a motor to accomplish this costs 4x the cost of any meth kit. If you have the dough.. buy the heads, big cam, build the motor, etc.. once oil starts creeping into the combustion chamber cause your driving it around.. that motor will not be as friendly with the low octane fuel. Let alone the CA 90 octane with up to 10% ethanol
Big difference when dealing with pistons with crud on top of them vs a brand new motor making 3 second dyno pulls with a fan blowing in front of it.
The ability to make good power on pumpgas is what separates the stock 5.3 builds from the built, forged, aftermarket head engines. Yes you can make good numbers with the stock parts, but you have to push the combination harder which in turn requires more detonation resistance (octane). Like Julio said...
