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Turbo issues.

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Old 12-22-2016, 07:50 AM
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Turbo issues.

Ok so I have a 2002 24v with 275k miles on it. For upgrades I have 120 hp injectors, edge chip, fass 150 ghp fuel pump, head studs and now a bd super b special. My problem is my truck won't build more the 30 psi of boost. I was under the impression that I should be somewhere in the 40 psi department. Any tips or advice would be greatly appreciated.
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Old 12-25-2016, 05:08 AM
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They're are a lot of factors that go into determining appropriate boost for a specific turbo. 30 psi isn't a bad number, and obviously 30 psi with your new turbo, is much greater amount of air than your factory turbo could ever produce at 30 psi. I had the same issue with my turbo when I 1st installed it, I was running 32 psi regardless how hard I pushed it. What I learned to be by problem, was a boost leak. It's amazing how such a small leak can cause such a dramatic difference. I didn't have a new turbo to manifold gasket when the new turbo arrived so I reused my previous existing gaskets.

I discovered my leaks but spraying some water on the mating surface between the turbo and manifold. It's a good idea to check between you Intake and heater grid also. Check for bubbles. I replaced my gaskets, and on my next lap with the truck, boost levels wereally as high as 50psi :-o

If it is a waste gated model, it might be worth checking the waste gate. I believe most are set for 40 psi, but if it was purchased pre owned, someone may have adjusted it and could be messing with your numbers
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Old 12-26-2016, 08:53 PM
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Thank you for your response. I took your advice and sure enough I have a leak where the turbo meets the manifold. I'll let ya know how it runs when I get it fixed, thanks again for your help.
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Old 11-22-2017, 07:22 AM
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Originally Posted by YZ3500F View Post
Thank you for your response. I took your advice and sure enough I have a leak where the turbo meets the manifold. I'll let ya know how it runs when I get it fixed, thanks again for your help.
Bad Karma not to post results of fix.
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Old 06-13-2018, 09:01 AM
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Sorry about the late response. According to the guy I spoke to at edge, the sensor they tap into the read boost pressure can only read up to 30psi. I think it he said it was the mass airflow sensor but I could be wrong. He said if I put a mechanical gauge on that I would be seeing higher boost numbers.
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