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Re: Turbo boost Posted by Ari [Email] ![]() ![]() In Reply to: Turbo boost, Paul Rogers, Mon, 15 Jan 2001 09:31:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
There is a fuel-cutoff if the boost goes too high. The engine cuts out pretty abruptly, but comes back in once the boost drops down.
Unless you've modified your car, the boost should only get to around the line between the yellow and red. It really shouldn't go into the red too far. It's possible that you've got a problem with the wastegate actuator.
The wastegate actuator is a small cylinder, about 2 inches in diameter, right by the turbo. It has a linkage that goes to a lever under the turbo, and there is a hose from the APC solenoid (mounted on the radiator) to the actuator. First, make sure the hose is OK, with no cracks. Look near the ends of the hose, as it tends to crack right by the nipple, especially near the hot turbo. A leak there can cause overboost. Next, with a COLD engine, grab the linkage from the actuator to the turbo. You should be able to move it in and out about 1/3- 1/2 inch. Not a lot of movement, but some. It's possible that the linkage just got a little sticky, and didn't limit boost when it should have.
If the problem has gone away, fine. It could have been a little binding in the actuator, nothing more. The fuel cut-off protects you, although hitting it can be pretty shocking. If the hose is OK and the problem comes back, make sure there is no binding in the wastegate actuator. In some cases I've heard of the linkage falling off the turbo end (it's a ball and socket like joint with a cotter pin). No linkage, no limiting of boost.
It's possible that there is a little binding, and that is causing you to get more than normal boost. If there is a pinhole leak in the hose to the actuator, you'll also get higher boost. In fact, putting a controlled leak into that hose is one way to 'dial in' extra boost.
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