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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Thierry,

That confirms my thoughts.

With this then, a larger compressor wheel will slow down the hot side and allow more air to be pushed through the cold side.

With this approach the WG circuit must be part of the equation we can count on.

I had a 7006 K29 and a 7006 based HF. They both hit full boost at about 3600rpm. The HF was an early version but in my case, even with the larger hot side I could not keep from getting exhaust creep with my B&B WG design. It took a Tial .7 bar WG w a EBC set at 1 bar to keep it from going over 1 bar. On just the .7 bar spring I would hit 1.1 bar.

One contributor on this board that seemed very knowledgeable noted that the K27/T3 based turbos are mostly going to be a restriction for big HP on a 930 and that a T4 was the way to go.

The K27/T3 is about 5.5 sq inc and the T4 is about 5.5 sq in if I measured right.

However, the GT 35 seems evidence that a small turbine w a larger compressor wheel can work very well. Either its small hot side can pass more or our wast-gate circuit just needs to be there to take up the slack.

Last edited by 911st; 02-16-2010 at 12:21 PM..
Old 02-16-2010, 12:09 PM
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