when does 2.5" intercooler piping start to become a restriction

[TheShodan]

Originally Posted by TopEndTuner Okay I was thinking that the CFM I calculated was the Max output and I figured that would vary by the amount of boost. Glad to know I'm good. Does anybody know an equation to calculate the cfm of say any charger at only a percentage of its max? There is a way to do that, but it is not easy and you have to put in at least 10-15rpm points in order to find out the CFM of the engine to match with the turbocharger. Going by the amount of boost is not as accurate as using CFM. remember, the turbo is an air pump, so volume per cubic meter is best to use.

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[HiProfile]

The fact of the matter is converting still leaves you in the same boat - you'll never know the limit to a given setup w/o some massive amount of formulas & calculations. The esiest way is to look at other setups & how they've done.

As far as the small/large piping, there's virtually no benifit. No body has made any compairisons, they just expect it to work like an NA header with stepped primaries. The problem is the pressure drop the fmic introduces - you don't need stepped charge pipe sizes.