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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
I really like totle's vid and it makes me wonder.

I think what we see in the vid is first boost at about 2k rpm and full boost by about 2500k with a 4th gear pull.

In most shorter gears I think we typically see first boost with a K27-7200 near the same 2k rpm on a 'tuned' 930 but full boost is more typically closer to 3k.

With this 4th gear pull the 7200 turbo has lots of time to spool.

Thus, I am thinking the difference between a 2500 and 3000rpm full boost is a 4th gear pull reduces the turbo's mass and friction's effect on spool time.

This makes me wonder, if we ran a BB turbo close in dimensions to a K27-7200 (and maybe with more modern wheels and less rotating mass) could we see full boost before 2500rpm in the earlier gears to.

If you read some of the adds for BB turbos, they quote around 300 to 600rpm faster boost.

I wonder.
Old 09-24-2010, 09:37 AM
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