Quote: Originally Posted by Lagzilla
his car has the "ED" TIP mod and therefore throws no boost codes ... whether it will recognize 18 -19 psi as too much just by the MAP sensor sensing it then we'll have to see
[cleaned up a little 
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The throttle inlet pressure (TIP) sensor is used by the PCM to judge and adjust boost response via the factory boost control solenoid. If I remember correctly its solenoid also switches it to atmospheric to measure barometric pressure (sea level, high elevation, etc.). The manifold absolute pressure (MAP) sensor is what the PCM uses to calculate the amount of air going into the engine and determine when you're going into "overboost". But if you clamp or limit the output and not the TIP sensor the PCM should be seeing it as excessive pressure at the throttle and try to alter boost (if the factory boost control is still used) or take other measures to protect the engine. I mostly ran my car with Stage 2 so I never played around with tricking the PCM input from that sensor.
