I agree with that last line. IMO it is due to the heat induced expansion and velocity increase that happen in the compressor. The best no-fan, WOT efficiencies I am seeing (steady state) are around 60-65% with stock plumbing, that is at 70 mph. Also found that the best think I could do for the CAC, was fix everything else that is making it more difficult to perform its job. Namely lower the temp of the charge hitting it. That also slows air flow speed as well. A lower temp charge, is slower.
This data also supports the concept of pre-turbo water injection. That will slow charge velocity also, much like larger CAC tubes do.
With the stocker, I have found ambient airflow is insufficient, for the charge mass throughput that needs cooling. That is why I searched for sources of excess heat, then eliminating it. Resistance prior to the compressor was where I found most of the improvement potential. Like having a free super double duty CAC. The turbo spins slower also.
All in all, a new CAC is a lot of money for very little performance return. IMO
This data also supports the concept of pre-turbo water injection. That will slow charge velocity also, much like larger CAC tubes do.
With the stocker, I have found ambient airflow is insufficient, for the charge mass throughput that needs cooling. That is why I searched for sources of excess heat, then eliminating it. Resistance prior to the compressor was where I found most of the improvement potential. Like having a free super double duty CAC. The turbo spins slower also.
All in all, a new CAC is a lot of money for very little performance return. IMO
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