[JustJeff]

Originally Posted by Rotary Evolution

the compressor outlet doesn't show vacuum, only boost positive pressure and not the same pressure at the manifold leading into the engine so it isn't a good spot for the pressure sensor line. the sensor needs to see engine vacuum and pressure that the engine sees to accurately advance timing.

move the line to either the top or bottom front port just past the throttle body off those 3. the center port iirc goes to a port before the throttle body so isn't a good MAP source.

i highly doubt this is your problem but it is a problem that should still be addressed.

Yeah, I was thinking about just that while diving home for dinner. I need to get more vacuum hose to make any changes so that will have to wait till tomorrow.

Whats your opinion of using the same nipple that's under the BAC for Pressure Sensor, BOV, and aftermarket boost gauge?

Also I tested my father's S5 N/A TPS resistances out of a growing curiousity... and found the same areas of deadspots on the narrow range where the multitester goes into OL and then picks back up for one single reading and holds. I seem to see this with every TPS I've tested.