Your intake temperature on Cobb is before the turbo compress the air. I have the same question as you as nobody show any data. One way to find out is install intercooler temperature gauge showing before and after ic temp. This way you can tell efficiency of the ic. I plan on install that gauge one of these days, but I am pretty sure your cfm surpass factory rating for the ic.
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Anyone that has tuned their GTR properly with SD mapping should be able to answer this question - as part of 'doing the job right' is to install a calibrated IAT sensor in the charge pipe. Once done, and the data logged, many would be - very surprised - how well the stock coolers actually cool. From what I have seen there are some aftermarket intercooler downgrades around that may have a fraction less pressure drop but also dont cool the intake charge worth a dime. The only thing we can make out wrong with the stock intercoolers at sane power levels is the word 'stock' in their name. Its not cool like having a Motec Systems exhaust
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Your answer is to measure the pressure drop across the core at the boost level you want to run, then measure the temperature drop and come up with an overall efficiency number - then do the same test with the aftermarket cooler of your choice.The one with the better math is the better intercooler.
Note - If I remember right 800hp Cobb Time Attack GTR ran stocker intercoolers....
Your answer is to measure the pressure drop across the core at the boost level you want to run, then measure the temperature drop and come up with an overall efficiency number - then do the same test with the aftermarket cooler of your choice.The one with the better math is the better intercooler.
Note - If I remember right 800hp Cobb Time Attack GTR ran stocker intercoolers....
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