not so much boost
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Joined: Jul 2006
Posts: 12
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not so much boost
I need some help. My problem is when I run over 28lbs of boost for more than about 20 seconds my check engine light comes on and it acts like it just shuts the turbo off I can only get it up to 16lbs with the check engine light on after about 10 minutes of easy driving the check engine light goes out and everything is fine again. Here's what the truck is. 2001 7.3 6 speed. uprgraded garrett turbo with the banks big head waste gate a banks intercooler, ts performance chip k&n cold air intake and traight through 6" stacks. What can I do to stop the check engine light from coming on and killing my boost? One more question before I go, Why can't I get any boost before 1700 rpm?
Posting Guru
Joined: Jan 2008
Posts: 1,661
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From: Bridgewater, VA
itp overboost annihalator. Your overboosting, the pcm reads too much boost, and defuels to prevent damage to your turbo.. The no boost before 1700 is because the turbo is a nodular bearing system and it takes time to get it to boost. Correct me if im wrong, but i know about the overboosting ur having. Hope this helps
Posting Guru
Joined: Jan 2008
Posts: 1,661
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From: Bridgewater, VA
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Please explain nodular bearing to me. I thought i knew a little bit about turbos and how they work, it takes heat, pressure and exhaust velocity to spool a turbo to create boost, not usually below 1500-1700rpm, but maybe i am wrong.
Posting Guru
Joined: Jan 2008
Posts: 1,661
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From: Bridgewater, VA
I said to correct me if i was wrong... a guy explained teh difference of teh nodular and ball bearing to me. Agreed with you though on heat, pressure and velocity. I'm no turbo expert. The stockers are a nodular bearing though, correct?
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
No, they are bushed, with two bronze bushings holding the shaft steady. Don't know what a nodular bearing is other than one that moves like this : 
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Posting Guru
Joined: Jan 2008
Posts: 1,661
Likes: 0
From: Bridgewater, VA
Well, fair enough. Haha i'll admit when im wrong. I guess i looked at bushed as a nodular, kinda like a smaller cylinder, correct? Isthat what u mean by bushed? Small bronze cyliners, more or less
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