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Old 04-24-2007, 12:02 PM   #4 (permalink)
Tracy
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Join Date: Jan 2006
Location: Okanagan BC. Canada
Posts: 771

How is the spring rate you are talking about arrived at. It is not similar to how valve springs are tested. I was not able to get this type of spring rate info when I was looking for springs at the auto parts store, maybe a more specialized shop could get those figures?

I was able to test the cracking/opening pressure of the wastegate with the spring at its operateing hieght for the GM-3 by using a simple fish scale. Through trial and error I found that a larger dia. spring with more coils per inche gives gives a much more consistant wastegate operation, no spikes or droping of boost after wastegate opens. The wastegate spring I have now is consistant to within 1 psi no matter how the truck is operated.
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