how does water/meth injection work?

Jordo!

Ha ha ha -- a lot of views but no additional questions or comments?

Okay, some more info for anyone who might be curious:

You can actually just run straight distilled water as an anti-detonanat (water has a theoretical octane of infinity as it cannot auto ignite -- or ignite at all) and works better than anything else in terms of latent heat absorption capability.

The addition of alcohol (methanol being one of the best, others like to use toulene, but isoprohyl, thouugh less ideal, would work too) prevents freezing (water alone will freeze if it gets cold enough) and adds some addtional octane as well as potentially provides more torque -- you have to burn a LOT of methanol for this benefit... stoich for meth is around 6.5:1, so you need to burn more than twice as much for each unit of air.

This is also why if you have the motor set up to run on straight methanol you can make quite a bit more torque and power -- expensive and needs alcohol friendly components... tho'. That's a whole different project...

Anyway, if you search on line you can find out tons of info on the latent heat absorption capabilites, stoicihometrics, and typical octane levels of all of these various fuels.

Labor depends on how complex their kit is, but basically it should include lines, nozzles/injectors, a tank that has to be mounted somwhere, a (hopefully progressive) controller, a pump (aquamist has really trick ones, but a standard pump works just fine!) and ideally a few warning lights. Probably another 4-6 hours to get it all installed and buttoned up?

As to tuning time -- if it's already on, then it will take about as long to tune with as without it.

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