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Craig 930 RS Craig 930 RS is offline
Me like track days
 
Craig 930 RS's Avatar
 
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,152
I stand corected on the K26 heat!

Kevin explains it fully in his reply:
> When you have a smaller compressor wheel to make higher boost levels you have to speed up the rotating assy. When the wheel is spinning faster more heat is generated when you compress the air. A larger wheel is spinning slower and makes more boost.. The K26 was designed to make .7 bar.. If you spin up the wheel to make 1bar.. More heat is generated than a larger slower wheel.

> Then you have to look at the design and shape of the wheel or ability to generate boost. The efficiency takes into account the heat that is generated. A 80% wheel generated less heat than a 70% wheel. The K26 wheel is a dog compared to the higher efficient HF wheels.
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Regarding intercoolers: As a reference - In the words of Stepehen Kaspar, intercoolers do not add HP, they prevent the loss of HP. IF you are using an IC for street use only, a larger intercooler may very well never be necessary.

The temps normally don't rise enough with any possible street run to justify it. Like I said, I'll run an objective post-IC temp test in a week or so. I just have never seen temps rise much at all - ever - on the street. Hang tight, we'll take a look.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 02-25-2007, 08:10 AM
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