Dewey said:
I can liberate 99% isopropanol from work. Will it work just as well as meth?
I too can and have done this
You'll have to decide for yourself if it will work just as well
isopropyl has a slightly higher octane than methanol (i think its 1 or 2 points)
but it has much lower latency of heat, I dont remember actual numbers.. iirc about half as much
it also has a much leaner stoichiometric AF ratio.
So youll have to remove more fuel from your chip if you wish to use the same volume as you do with methanol. Im talking about a pretty substantial difference... when I switched to meth I had to add a ton of fuel back into the chip just to get back to where I was before with the alky maxxed out.
Isopropyl has a higher BTU content
You would have to sit down and do some math to determine which would make you faster considering equal amounts of consumption and that would get pretty complex...
for example, if you inject an equal amount, you get more energy from the iso but with the meth you must run more gas and you get more energy from more gas
and then you have to consider just the volume of space taken up by the alcohol that isnt oxygen which would be more space taken up by the meth setup
then consider the latency of heat which the meth has a definite advantage maybe allowing you to run more boost
in any event I think they are pretty close, running both ive run 7.5's in the 8th mile, I dont have a very good back to back comparison because between them I swapped trannies to a lockup setup with a tighter stall and no slippage between shifts. I ran 92 mph with the iso and the old tranny and 94 mph with the meth and the new tranny.
So I think they are pretty close