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Originally Posted by Brian Carlton
I assume that you did this with the vehicle stationary. As such, the turbo cannot produce much boost, if any, because the engine is not sufficiently loaded. Therefore, this would be a poor test to determine if the turbo is performing satisfactorily. Your previous result of 6 psi does show that something is amiss, provided that you got that result with the engine under full load (vehicle moving) with the rpm above 2500.
In this case, I concur with the previous posts whereby the wastegate is likely to be the primary culprit. There is no need to spend a lot of money rebuilding the turbo unless it is absolutely required.
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I took the crossover off and ran it staionary to see if the turbo was turning at all since I wasn't sure it was.
I ran my vac/pressure guage from manifold and alda (with a tee) connecting a 2 ft. section of vac hose with guage up and back through some hols in the firewall and up and under the wiper blade so I could see it while driving. Floored it from second on a long straightaway and watched the guage and tach until the engine would not put out any more rpm and the tach read 4000 rpm, pressure guage read 6 psi.
Is my wastegate not closing all the way?
What is limiting the boost?
What causes a supposed worn out turbo to limit boost?