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Clap135, do you not agree with my post 222?
And another thing is that as far as efficiency goes, the turbo that makes more boost will always make more power. A .5 psi pressure drop is most definitely not going to cause the turbo to operate out of their efficiency range anyway.
The variables are ait boost pressure and the time it takes to reach boost target.
In our case, boost pressure is a constant set by the boost target. So either way, efficient or not, all cars with all intercoolers will hit their boost target. That basically makes turbo efficiency irrelevant.
The only way efficiency comes in to play at all is the possibility of a cooler pre-intercooler charge air temp, but since this is not the temp. That is going into the engine all that really matters is the temperature of the air being combusted and the helix has so far shown to consistently produce the coolest ait.
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