Low boost
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Junior User
Joined: Apr 2005
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Low boost
put on a brand new ats wastegated turbo and I'm only getting 4 pounds of boost. I talked to a tech at ats and went through some checks and he said my injection pump might be weak? How can I check this out? He also said that the wastegate is set-up to open at 13 pounds, but when I disconnected it boost went to 6 pounds. What else can I check.Timing is a 8 degrees, pump turned up about 1 flat, 3.5 inch exhaust, Dave S. custom 4 inch intake.
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Junior User
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the truck blows black smoke at take off and under load like going up hill or heavy acceleration. I pulled 12,000 pounds this weekend and and drove it empty and boost did not change. Uphill at 2500 rpm is 4 pounds. thanks
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
did you put the o ring seal on the intake plennum? did you check the hose to the guage to make sure it is not leaking or kinked? did you turn up the injection pump when you installed the system? Did you over tune it? do you have a pyrometer and check the egt?
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I put in the o ring seal, checked the hose and didnt notice any leaks, I turned the pump up two flats and ran it, the egts climbed to 1,100 really fast, so I turned it back down one flat and it seems to be good for egts there. The boost read the same at all settings. Crusing down flat highway at about 60 mph 1850 rpms it shows no boost until I get to a slight incline the boost shows 2 lbs, egts are at 475. The thing that baffels me is that if the wastegate doesnt open until 13 lbs. how did I gain 2 lbs of boost with the wastegate line plugged?
Last edited by Pigeon; May 10, 2006 at 06:56 PM. Reason: forgot something
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
No smoke and low boost is a lack of fuel. Barring an indication problem black smoke and low boost is a lack of air. Possible sources are an intake restriction, boost leak, or exhaust leak.
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
boost is a product of fuel burn. when you installed the crossover pipe did you change the mounting bolts from the kit? this change allows a tighter seal in the crossover pipe. With the ats system, you should be able to make 7psi of boost without a problem. 1100 degrees is the max you want to make in the egt's for any length of time. Also make sure the fuel filter is clean and the throttle is moving to full open position ... have someone work the pedal from inside with the engine off and see if you can manually move the throttle on injection pump any further after the pedal is on the floor.
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Bilder12: I took the manifold studs out on passenger side and used the suppplied bolts to connect the cast y to the manifold and reinstalled the studs in the y where the crossover pipe connects. is that what yopu are talking about?
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Posting Guru
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From: Northeastern Pa - USA
yep. i'm trying to eliminate the possibility of any leaks for you. If you have all the right parts in the right places, you should be making 7 psi of boost under load with about 3-4 psi of boost at cruise.
Posting Guru
Joined: Jul 2004
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From: West Valley Utah
How does the truck run compared to how it ran before installing the turbo? Is it possible that the boost is fine but the gauge is not accurate?
If the engine is running good and pulling good, there may be a restriction, leak, kink, in the line to the boost gauge.
If the engine is running good and pulling good, there may be a restriction, leak, kink, in the line to the boost gauge.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Where is your thermocouple installed at?
What are you running for a muffler?
I also wonder if you have a bad wastegate that is leaking air.
Did you happen to note the boost when the EGT was on it's way to 1100 degrees?
What are you running for a muffler?
I also wonder if you have a bad wastegate that is leaking air.
Did you happen to note the boost when the EGT was on it's way to 1100 degrees?
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First off I have autometer c2 mechanical boost guage tapped into the intake plenum that I ran nylon tubing to, then I verified that the guage was reading right with another boost guage, then I ran a copper line to replace the nylon one and got the same reading. The thermocouple is in the driverside manifold and the boost was maxed out a 4 psi at 1100 degrees. When I disconnected the wastegate the boost went to 6 psi. I had the auto jet exhaust kit on the truck already so that is what the muffler is 3 inch in 3.5 out. I unhooked the exhaust at the muffler and took it for a drive and got the same readings. I am at a loss here, any ideas or comments are greatly appreciated. thank you
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From: Northeastern Pa - USA
to adjust the waste gate pressure ... remove the c clip holding the arm to the lever. DONT loose the clip !! remove the actuator and the rod from the unit. Count the threads on the actuator arm. Remove the arm from the clevis. Run a 5/16 tap into the clevis to relieve the stake mark in the clevis. Reinstall the rod to the clevis to the point of origin ... every 3 complete turns into the clevis will gain about 1 lb of boost. DONT go for more than 3 extra lbs of boost!!!!!!!! Reinstall to the system and hook up the actuator lever to the waste gate arm and install the c clip. DONT LOOSE THE CLIP ! and DONT SHOOT FOR MORE THAN 3 LBS MORE BOOST !!!
OH, did mention ... DONT LOOSE THE CLIP !
OH, did mention ... DONT LOOSE THE CLIP !