It reduces voltage applied to map from 5 to 4.6. The engineers goofed when they made the instrument panel gauges.
Reason you take it off is to get full resolution from the sensor.
Now.. GM made an adapetr harness for new sensors used on the TTA. The wiring flipped on the terminals for a 3 bar MAP. So you cannot plug in a new 12223861 3 bar MAP into an 1989 TTA without the harness GM sells that flips the +5 and Ground wires to it.
So technically there are two plugs. One to calibrate the 3 bar to dash,and the other that didnt come with the car to adapt the newer style 3 bar to the TTA.
So if you take it off to get full resolution from the sensor how do you get the Powerlogger, and gauge to read right? Thanks...
so if we install razor's alky we lose the stock boost guage?
It still works just not accurate. Not like it ever was or is usable.
I know my powerlogger logs correctly. I wonder if the alky kit allows it to be accurate?
Jason
Mine reads really close too. Probably within a lb or 2 max of the manual gauge. I was tempted to take the plug out and try it. But after reading dvernsts post maybe not. :tongue:
Try it...I don't run the plug...kinda puzzled by it.
Jason