^

That article was written about Cartech project when Cartech was owned by Corky Bell.

This is not the case anymore.

 

I think he was referring to the stock turbo thermal efficiency section.

 

yes. notice please it says "is that the stock turbo has a measured efficiency
of only 49% at the peak flow rate of the motor" they do not mention what rpm that is. they also do not say what it is at other load/flow points.

for the intercooler they say "In measuring the intercooler efficiency the stock car showed a heat rejection of 68% of the incoming temperature from the turbo above ambient, and a pressure restriction of 1 psi at 5.5 psi of boost." again they do not say when the 68% is produced.

so what do we know?

we know that the stock turbo is too small in the higher rpms. we know the intercooler has a large pressure drop.

we can also read the rest of the article and see what they did and what results they got. to go from 150rwhp to 240rwhp is better than most here, now.