How worried ahoukd I be about running meth or not? I'm around 14lbs now. Waiting to get a 2bar tune. If I can ever make it to houston for wheatley to tune it in person.

 

Meth is great! Apparently E85 is more better.

 

Lol, not necessarily. Richard only pointed out the benefits of E85 from an energy use standpoint. I wouldn't take that as 'E85 is better' because that's literally only the tip of the iceberg, as I mentioned in that thread. I don't blame him for not writing more about it though lol...there are countless books written on the subject, so it is far from simple. But as his last paragraph explained, there are many other things to account for when comparing methanol injection to E85. One of them is the methanol:gasoline ratio. The location of the fuel injection is also huge because it plays a part in heat absorption and how much occurs inside and/or before the cylinder. It can actually change the volumetric efficiency of an engine because the air charge can become denser. Again, still lingering on the tip of the iceberg

Anyway, to the OP...I would generally consider 12psi to be the point where you need to start looking at higher octane options. 12psi isn't always the rule, though.

 

Side point. At what amount of meth is to much meth? Need cylinder lube additives? If you go meth. Call Julio at Alky-control. One of the few real customer service folk still around. After getting meth , I wish I would have done it sooner! Good stuff for sure!

 

The more the merrier, really. With a given fuel, there is a point where the knock threshold crosses the MBT timing value as manifold pressure increases. Higher octane fuels like methanol move this point to higher manifold pressures so you can run more timing without the engine knocking. The only way you could run too much methanol is if you inject enough to move that intersection point to a manifold pressure higher than your desired boost level. Then you could actually add enough timing that torque decreases, so the additional octane would be a waste and only contribute to higher EGT. With the compression and boost levels we run though, I doubt it is possible to move that intersection point much past atmospheric pressure. As for cylinder lube...there would be no cause for concern unless you were cold starting the engine on straight methanol Injecting it while in boost and already making substantial heat vaporizes the meth too quickly to wash cylinders.

 

Good deal then. Translation... add another nozzle Rodney!
Yipeee !!! more meth FTW

 

One downside of meth is the cost. At least around here it's about $9/gallon and only comes in 5 gal jugs. I mix it 50/50 with distilled water.

 

Damn. Its the same price as 91 here.

 

If your going 50/50 look at some below zero windshield washer fluid.
The cheap stuff, no added rainX etc.
it should be coming to parts shelves with winter coming.

 

Last I bought it I payed $3 a gallon. Local shop has it.