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Originally Posted by sp00ln
That should NOT effect your boost... that is so minor.
And map sensors dont measure the exhaust pressure - they measure the intake manifold pressure. Every fuel injection car has one. I doubt you have anything measuring your exhaust pressure.
If you think its your MAP sensor messing up, you have a boost leak. Time for a boost leak test! |
You must have x-ray vision or something to see the hole in the pipe that's behind that braided steel. Trust me, the leak is *plenty* big enough to limit my boost. See that junction between the up-pipe and header? I've had simple gasket leaks there that will kill the boost... what I've got now is an outright *hole* in the pipe... with the car running you can put your hand near the flex and it's like a friggen blow drier blowing hot air!
As far as the "exhaust pressure"... who measures exhaust pressure? Wastegates use the manifold pressure as the feedback loop parameter. When the turbo is making too much manifold boost, the wastegate opens reducing the force on the impeller, which lowers the boost. With a MBC, the manifold pressure simply reaches a point where it can bypass the ball/spring in the MBC, which allows the pressure to vent to the wastegate control valve which opens the wastegate. An EBC just adds a computer that monitors the manifold pressure and opens a valve to operate the wastegate depending on the boost. At no point is exhaust pressure measured.
The only exception might be on a cheap external wastegate that has a simple valve that opens at a pre-determined pressure level like a BOV. But even in that case, there's no sensor monitoring the exhaust pressure.