inject in vacuum AND boost?
 

Have a few possibly stupid questions pertaining to water/meth injection.

The setup I was thinking about trying is pre-turbo mechanical water injection - no intercooler - with post turbo 100% meth injection or (something less dangerous). my power goal would be 450 horse and the car would see a lot of the street.

I have been pondering on this idea about injecting methanol progressively from vacuum through ambient into boost. A typical setup is obviously boost only injection. Not sure what all of the benefits are for a rotary seeing as we don't need high octane in vacuum due to not having high compression ratios, but the added cooling in intake temps I thought might make it something to look into. I would think out of boost, a mist of meth would drop intake temps below what the intercooler could giving you more daily drivability torqueier and more responsive. Possibly better mileage at cruise.

2. my other question. with high gas prices if avoidable i would like to avoid filling my 16 gallon gas tank with premium. has anyone here experimented with 87 octane and water/meth injection? what kind of octane numbers are feasible and would it be enough to consider going such a route.

What are your thought other than just keep the intercooler : )

Since methanol is a fuel, you "can" run 87 and use the methanol as an octane supplement. You would want to make sure that you are failsafed and tuned for the low octane plus methanol.