Quote:
Originally Posted by Former_Boosted_IS
John, the efficiency of the stock intercooler is what this all about regardless of anything else. The stock intercooler has an efficiency of about 50% and the upgraded ICs are at about 90%. That means they will cool much more effectively regardless of the temperature.
Second, the pressure drop across the stock IC is about 2 psi and around 0.5 psi on the upgraded ICs. This means, you turbos have to spin at lower RPMS to produce the same boost with the upgraded ICs.
The bottom line is the stock intercooler is a hunk of metal that absolutely needs to be replaced.
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So for intercooler, is "efficiency" different from size? In my previous turbo car, upgrading to a bigger intercooler increased the turbo lag. Then people on the forums said that the theory was, you needed more air to fill up the bigger spaces in the intercooler/tubes to boost the turbo. I don't know.