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VP M-5 use

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alkyal:
Does anyone here have real experience with the change-over from straight Methanol to M-5. Jet changes[ with a carb] and timing changes. Do you need a gear change to keep the engine loaded, like on real Nitro.

George:
I tried it for several runs with an injected SBC. I didn't see much of a change. The stuff won't pass fuel check. I would buy the least expensive alky and add nitro to taste. A 10% blend will show real results.

FEDNV:
I have tried it quite a bit in my injected BBC.  We were trying to pick up a little time and decided to try it and it worked pretty good in my car.  What we found, at least with my car, is that the tuning changes really made a difference compared to straight methanol.  We did need to fatten it up a little.
Drawback of course is the cost.

Curly1:
I have not tried the M5 but I have had good success with adding a few percent of Nitro. On my motor on the dyno we tried a 20% mixture with 1 quart of Toluene added. If you are under say 12.5 compression you may not need Toluene or if you are running light load like 5% or so. My motor is 14.5 and it needs the toluene to prevent detonation.
Now with that said up to 20% nitro on my motor (your mileage may vary) I did not need to add any timing or fuel and when we tried fattening it up or adding timing it made it worse. Just adding 3% nitro will pick it up about .06. I usually run 2-5% to get it right on the 5.00 index I run. Does not take much. Hope this helps.

Spud Miller:

 From a known good, working methanol tuneup, M-5 requires about 7% richer in a supercharged application and about 5% for naturally aspirated. Make your carb jet area that much BIGGER and things should be pretty close. Injected guys would make their bypass area that much SMALLER.

No need for gears or anything drastic.

 Spud

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