For comparison, what is the flow of the stock 996TTs?

 

Same as 997.1's

 

Thanks Earl! What's the hold up on that other write up???

 

celsius?

this is what I did a week ago at 1.3 bar boost with very small turbos.
may be flow is a tiny worse but the IAT is best bang for the buck.

(speed in kph, temps in celsius)

 

What type of turbos do you have in your setup? VTGs get pretty hot.

 

double post

 

K24 2472 GGC (1mm more than X50 stock)
I run them at the very outer limit of the compressor, so getting hot air.

 

would you please explain how a bigger ic(997.2)can flow less than 997.1 ic which is smaller and has more restrictive tanks ,more resistance....all guys using 997.2 ic realised a drop in boost,so automaticaly flow shoud increase since flow and pressure are inversely proportional
Thanks

 

Keep in mind that the graph only represents flow, not efficiency of cooling. The denser core of the .2 intercoolers definitely provides better cooling, but is more restrictive by nature. The redesigned end-tanks certainly help, but obviously the core is still restrictive, or we wouldn't be seeing the bottom tanks blowing off. Also, the intercooler itself is physically the same size as the .1.

Why is this? Well...that's a question for Porsche engineers. We simply took all 4 intercoolers to an independent shop called Wilson Manifolds for testing. There are the results.

 

i know that the graph represents flow and not the efficiency of cooling...you are saying that .1 and .2 ic have same core!!!!!please check the 1st page in this thread ....997.2 core is bigger .

 

Yes, the .2 core is slightly bigger, has more rows of cooling, and a much denser core. But you'll also notice in this picture that the .1 cooler has an empty passage on one side to help flow...which the .2 cooler does not. Thus the restriction.

I'm not here trying to sell intercoolers or say why one is better then the other. I'm just offering the results of testing that was done independently outside of our shop, in order to maybe help explain why suddenly people are having issues using the .2 coolers in higher HP setups.

 

it does not mean to be thermodynamical inefficient to have less flow but denser and cooler air, but a slightly higher boost before the ICs.

the principle is similar to the
The expansion intake system introduced in the 997 GT2 and explained here:
http://www.google.de/url?sa=t&rct=j&...qDfUz_FSLkEEgQ

 

This might be more applicable to 5-6" ICs.

 

it depends on the pressure drop not on the size.

 

Larger size = Larger volume => Larger pressure drop