Boost issues!!!!

J

jsmith3391

New member
Joined
May 28, 2012
Messages
65
Hello fellow cummins owners. I'm having issues with boost. I have a d-tech 64mm turbo...stupid purchase in my opinion. But have always had issue building boost and when I say that, I mean I only max out at 34psi. I've adjusted the gate and can't get anymore. I just put a stainless diesel spring gate on the turbo and have it cranked all the way down. Still only see around that 34psi. And I don't know if I have any boost leaks cuz I don't any decent tool to check. I bought this stupid thing from a diesel site that goes on your turbo input to check but that makes no sense cuz u have intake and exhaust open so u can't pressurize the system. Any decent boost leak testers out there? Any input on anything is appreciated. I've had little luck with this on cumminsforum



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Take the rocker arms off or back the lash off till they aren't touching the valves
 
where is your intake open? how is it not going to seal?
 
Well I have a hunch that I have a boost leak somewhere. I bought a boost tester from pdp to go on the turbo input. I put psi to it and it escaped as fast as I could put it in. I have a 64mm d tech and I figure I should be seeing lot more than 34 with the fuel I got. 5x.014 sticks. 024 valves. 4k spring kit. Cut plate slid forward. 20* timing. Air dog system.

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With the stock turbo I could hit 40+ but its been a year or so since if got rid of that

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Check, boots, clamps, manifold gaskets and charge air cooler with soapy water.
 
So with this boost tester I have which just goes on the turbo intake...I have to back off the rockers so all the valves are closed?

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Could be possible that your intercooler is leaking somewhere as well. It definitely sounds like a boost leak to me. Do everything Brad^^^ said and report back to us.
 
jsmith3391 said:
So with this boost tester I have which just goes on the turbo intake...I have to back off the rockers so all the valves are closed?

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Yes that ensures a proper seal.
 
Found my problem everyone. The gasket for the intake plate was blown out were the filter head used to bolt to. I have an air dog and removed that filter head and put the bolts back in. Well the problem is that those 2 bolts are longer and bottomed out in the hole and didn't tighten down on the plate so I had a steady stream out when I pressurized the system. Plates off and gotta order a gasket tomorrow

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It wasn't noisy when I psi tested it. I could hear an air howl like the air was travelling then I soaped it down and then I could feel all the air passing through where the gasket was. It was blown out so bad I couldnt build any psi with the tester. When I would drive the truck I could hear a hissing so I kinda figured I had a leak. Would run hot and smoke bad at high rpms

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jsmith3391 said:
Found my problem everyone. The gasket for the intake plate was blown out were the filter head used to bolt to. I have an air dog and removed that filter head and put the bolts back in. Well the problem is that those 2 bolts are longer and bottomed out in the hole and didn't tighten down on the plate so I had a steady stream out when I pressurized the system. Plates off and gotta order a gasket tomorrow

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Well... that was easy enough.
 
Yeah so ill get this all fixed and psi test it again for any other leaks. It was such a big leak that no psi was built. Steady stream of air out

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I just did this to my truck tonight. I didn't back off rockers or block exhaust yet. I found 3 leaks at 10 psi. 2 boots and a pin hole in the intercooler.
 
I just did this last weekend, I put shop air in the turbo inlet, never loosened the valves or anything, regulated it up to 50 psi. found a couple very small leaks. I would also suggest a ratchet strap or something to hold the test fitting/plug in the turbo. I have seen them come out, and at 50 psi, you could get seriously hurt.....just sayin'.....
 
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