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Craig 930 RS Craig 930 RS is offline
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Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,152
"The boost creep issue people are seeing with Tial's on B&B headers has nothing to do with a fault of Tial wastegates. Tial's are about as high quality as wastegates get. I don't know much about the B&B 930 headers, however from a common sense standpoint, there are alot of issues when designing headers that can cause boost creep or other wastegate/boost control related issues. Some of these are too sharp (such as a 90 deg. bend) or too short of a wastegate runner from the manifold, too small of a diameter for the runner, etc. It's more likely there is some sort of flaw with the B&B design that is causing the inconsistant boost levels."
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Important to understand that the issue here is:

B&B + Factory WG = Usually no problems; ie stated srping rate = actual.

B&B + Tial WG = From .1 to .3 higher actual boost than the stated spring rate.

Yes, this can be a big deal.

One can easily derive that the Tial + the WG pipe config. of a B&B equals higher than anticipated boost.
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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

Last edited by Craig 930 RS; 12-24-2006 at 11:13 AM..
Old 12-24-2006, 11:10 AM
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