IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: dyermullet on July 09 2016, 12:32:19 PM
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Has any experienced this issue. I have been experimenting with a new setup and using a grainger valve (manual boost controller) I built. I have the factory waste gate with the typical cut and threaded rod. When I installed the manual boost controller I also loosened the tension on the waste gate rod. I set it to where i only need to tension the spring the diameter of the hole to hook the rod onto the flapper arm. I can't get higher than ~20 psi even when I bottom out my manual boost controller. I was able to make adjustments and get a response until I got up near 20 psi then no more.
I am thinking the exhaust pressure may be forcing the waste gate flapper open. I had never ran this loose on the waste gate adjustment before. I am going to try to increase the tension on the actuator and see what the result is. Also I will pull the grainger valve off the car and test my last adjustment with air compressor. It is going to rain today so I don't know how much road testing I will be able to do.
Any one experienced this before? Any other ideas or something I am missing that is not letting me exceed 20 psi?
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typcially, you need an 1/8" tension on the wastegate rod.
Then, your maximum boost will depend upon the strength of the spring in the grainger valve...you may have to shim it or install a stiffer spring
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If you've ported the exhaust housing...you may have gone too far...and you're boost pressure will only hit a certain point. Never fear...as RJC sells a shim.
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Thanks I will test the opening pressure on the the grainger valve first and go from there. I have more than 1/8" of tension on the waste gate rod.
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20 psi is about all I could get out of the grainger valve I used until I modded it