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Originally Posted by Tom Vaught

Agree, Water Injection takes up "Air Molecule Space".

You basically reduce the chamber volume for air (which is needed to make the power when the right amount of fuel is added) so you possibly reduce the knock tendency but give up power doing it. Crappy fuel or the cost of fuel causes people to do lots of weird band-aids.

Tom Vaught

Water/Meth injection isn't a band-aid. It DOES raise effective octane rating. This is a proven fact. These systems are very popular with supercharged/turbo setups. The knock on them (pun intended) is that if the delivery vehicle (pump or nozzle or controller) fails, you can have a motor meltdown. In other words, when they work, they work as advertised- You can run more boost, more compression and more timing and make huge power with them. Several of the systems have fail-safe systems like sensors, low fluid interlocks, etc. But some guys opt for C16 for the peace of mind.

You can wire a retard system where, if the system fail-safes are triggered (for example if the fluid level in the tank runs low) then timing is pulled way back to prevent meltdown. These can be incorporated into a non-boosted app as well.

There's pros and cons for sure guys, but it's not really correct to refer to meth injection as a band air or to say it does not raise octane rating of the fuel it's mixed with in the intake system, because it most certainly does.