hemidup

Which is best for cooling?

nightrunner

iTrader: (4)

3rd times a charm right

btw to my knowledge water is for cooling, methanol is for the octane boost and the mix is for a compromise of the two

KySilverado

iTrader: (7)

Water from what I have read.

hemidup

Yeah, but now I forgot my original question. lol I know water is best for cooling , but with the 6.8 stoich of methenol, would that cause me to get inaccurate readings with my wide band 02 sensor?

KySilverado

iTrader: (7)

I run 100% meth and tune to 11.5 - 11.8 at WOT. No problems. Is it the correct AFR reading? I can't say.

hemidup

That's what I'm getting at. Your 11.5 to 11.8 a/f is fine, but are you actually running richer than what your a/f's show without meth? The 02 sensors don't realize what we're inducting into the a/f mixture.

KySilverado

iTrader: (7)

Yeah I understood the question, and asked the same questions as you when I first dove into meth. Also did a lot of research here and there. Could not come up with the exact answer. Got good advise from guys that have used lots of it and the advise was to run an AFR that you would normally use with straight gasoline. Thats what I did and works fine. Probably is a tad richer than indicated but some details just aren't worth pondering. MHO anyway.

hemidup

Well isn't that the purpose of running w/m, so you can run a leaner a/f with more timing to make more power? I'm just trying to find out what a/f is safe to run with w/m. I'm injecting w/m through my water/air intercooler and at a 13.2 a/f, It's not showing any signs of knock or detonation and I'm at 18* of timing at WOT. I'm also running 55lb injectors which are at it's limits. At 20*, the knock sensors picked it up and pulled 9* out. I run a Snowperformance 2 stage with the 625 and a 225 nozzle. It is set to come on at 4lbs and the max is set at 10. I use an Innovative LM3 along with a Snap On scanner to moniter and record each run. EGT's have never been over 800* at WOT. I use -20 washer fluid and take 18 oz out of a gallon and replace it with 18 oz of the yellow Heet. Anything wrong with this picture? It's still my A/f's that have me baffled.

hemifever

Tune on fuel first. Get the a/f where you want it to be. Then introduce meth. It's a tricky formula and everybody's combo will be a little different. Maybe shoot for more timing and meth vs. more timing, leaner a/f, and meth.

I run what would probably convert to a 600ml jet and I pulse it 8ms per firing rotation. I run 23 degree's timing at 8 and 9 psi and have 0 KR. And I run 11.5 a/f on gas.

FlaBouy

I too shoot for 11.5 to 11.8 AFR while tuning and I use a 50/50 mix and 625ml nozzle on my meth kit.... with the 50/50 mix you add about .5 AFR to the fueling and I have logged this through HP Tuners for months.... It is also the figures the moderators over on the Snow Performance forums quote whenever this is brought up. To the original question.... water for cooling..but....

The water is turned into steam in the manifold which assists the cooling process allowing a cooler denser charge to enter the cylinder.... so, on my non-intercooled centrifugal pulleyed to 12 psi@ 5800, I run the 50/50 mix with good success...BTW at 24* up top and no KR and I have not pushed to see how much more I can run... I start spray at 1 psi and go full at 10 psi...My mix is 1 gallon -20*/ 2-3 bottles yellow heet. My alcohol meter shows the yellow heet adds 7% per gallon. The -20 starts with 32% meth...

Hope this helps....