Quote:
Originally Posted by Moggie
The second log was when I was trying to provoke a spike by suddenly letting off the gas. Here data log records those very short spikes but my external boost gauge did not.
One other data point. Under very light cruise conditions the data log showed a 0.5 - 0.8 psi boost whilst I was not seeing any boost at all. I don't know what all this means -- I'm just reporting my findings (v2.0.1 default map).
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Those throttle lift spikes are normal and nothign to worry about. Since the TMAP sensor is just before the throttle body it will see a quick spike when the throttle closes; just before the bypass valves open. This is not in the manifold so the engine is not seeing this increasewd pressure. Perefectly normal and even something you would see in a stock vehicle; albeit at a lower level.
As for the slight boost being measured in the tinake tract. Variability in the sensors and again, the TMAP being before the TB. No true vacuum is ever seen at the TMAP in the intake tract.