Re: sizing a pre comp boost pressurised system
in order to take full advantage of water methanol injection, you need a fully mappable ECU. with the litte you can add without, you won't gain much.
Then as a second measure, I would propose a T04 size turbo.
These two will get you to 260 to 300HP without any water methanol on your VAG engine.
Regarding the air assisted systems I suggest you read riceracing's thread in the sticky section.
the reservoir is pressurized through a check valve, so no back flow into the plenum.
The fluid flow is controlled by a solenoid close to the nozzle.
This way the system stays pressurized and ensures minimum delay for spray onset.
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