Quote:
Originally posted by hobieboy
For the WG - its driven by my profec B controller. I should double check if I can tee it off the same port with the MAP sensor where it will see vacuum.
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I believe you missunderstood things.
Connecting WG to a T-orifice off the same port as MAP is very last thing you should do. Especially if electronic boost controller is involved.
Forst of all, you shouldn't T anything, especially not the wastegate.
Wastegate should be connected to pipes
before the throttle. Only thing electronic boost controller does is to modulate the pressure going to wastegate by blowing it off with magnet valve. When driving, your Profet T-Diddy Ultra Modulator will start blowing off air in signal line going to wastegate in order to raise the boost over base boost imposed by the spring. If you happened to Tee this line with MAP-sensor, your ECU will suddenly start believing that your boost is much lower than it is. It will inject less fuel into engine and boom, your pistons are shot.
Sensor eqipment (MAP-sensors) can be connected to thin lines as they esentially only sense the pressure and don't really have any flow.
Pressure-operated eqipment (wastegate, BOV) should
never be T-connected into any of sensor lines, as they frequently leak and alter the readings.
The very worst scenario is the one you described above...connecting pressure-operated and deliberatly leaky equipment on same chain as vital MAP-sensor.
Wastegate doesn't need vakuum...actually most of times it's just unecessary to feed it with vakuum as it will expose the membrane to greater pressure differential than if connected before the throttle (and thus never expiriencing vakuum).