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Re: please help me understand my turbo system Posted by sam96CS [Email]  (#852) [Profile/Gallery]
(more from sam96CS) on Tue, 5 Feb 2013 09:03:21
In Reply to: Re: please help me understand my turbo system, Simon S, Tue, 5 Feb 2013 07:32:24 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Simon S is probably right that the clip or pin is missing that secures the actuator arm to the wastegate's lever. The wastegate itself is probably open, so you are getting no boost.
There are 3 failures you might encounter with the light pressure turbo system.
1. Actuator arm disconnected.
2. Tear or hole in the actuator's diaphragm. If this happens there won't be enough pressure to overcome the spring that closes the wastegate, resulting in overboost. You can test the diaphragm by blowing into a hose connected to the actuator. If you can move air, then there is a hole or tear in the diaphragm.
3. Tear in the little hose that goes from the compressor housing to the wastegate actuator. It usually tears at the 90 degree bend near the compressor housing. If this hose tears, then the actuator's spring will hold the wastegate closed, resulting in overboost.
Symptoms of overboost are rapid acceleration to the point where the ECU cuts off fuel to the engine, resulting in bucking which is very unpleasant, hard on motor mounts, and dangerous because the power is unpredictable.
The plugged vacuum connector located at the air intake hose just before the compressor end of the turbo is supposed to be plugged in the light pressure turbo setup. Don't worry about it.
The only adjustment to the lpt is the length of the actuator rod. There is a locknut that holds the length where you want it. On my '96 the length is exactly 5 inches from the face of the actuator to the center of the little hole at the end of the rod. All this adjusts is the amount of base boost you get. I recommend you leave this alone for now.
It's nice to have a lift for working on the turbo, but you can get to it if you have ramps or a jack with jackstands to raise the front end high enough to crawl under. Engine must be cold. After the rod is connected if you don't have overboost then your hose and wastegate diaphragm are probably in good shape and you'll be ready to consider converting to FPT.
->Posting last edited on Tue, 5 Feb 2013 09:05:23.
, Tue, 5 Feb 2013 09:03:21 <-- Viewing This Message, Tue, 5 Feb 2013 09:40:26
, Tue, 5 Feb 2013 15:24:09
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