Quote:
Originally Posted by phattyduck
I have no way of knowing 100% for sure, but it looks like the pulley test was with the same restrictor for each test (note the max power is similar, but peaks at different times). The restrictor is then the other version - same pulley, but different restrictors giving different max power.
And technically, the restrictor doesn't limit boost - it limits max horsepower. When the engine can start to 'suck' more air at higher RPM compared to what the compressor is putting out, then boost pressure goes back down.
In any forced induction application, boost is the air that didn't make it into the engine - really, boost doesn't give you horsepower, airflow does.
-Charlie
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All of this is true, but the restrictor does effectively limit boost by limiting the source of air to the compressor.
The restrictor limits the compressor's source of intake air to compress. The airflow capabilities of everything after the compressor (IC piping, TB, intake manifold, head, extractors and exhaust) remain the same.
Imagine the compressor as a separate system. With a restrictor, the compressor effectively has an "airflow cap."
But theory and calculations are only so accurate anyway. The best way to figure out the ideal system is to try different options on the dyno while data-logging boost pressure, air temps, knock sensor feedback, HP, TQ, AFR, etc.
I am sure HKS is doing this (or has already done so) with their kit.
With a Rotrex at the core, and many tuning options, I know this kit will be awesome.
