So, I just replaced my supercharger pulley with a 15% reduced pulley with a +2% ATI Crank pulley. I got NGK BKR8EIX sparks plugs and a 1360mm serpentine belt to complement these upgrades. I have noticed that I have no power of 17 PSI of boost. Looking at the calculated boost on my Bluetooth OBD-II. This is usually around 4000 RPM. I have a code P0108, which is relating to the MAP sensor. I ordered a new one and installed it today and I am still having this issue. Is my ECU limiting power to protect the engine?

Any help would be appreciated, thank you!

 

I did a search and found this...

https://www.northamericanmotoring.co...ng-solved.html

Let me know how it goes. I’m waiting for all those parts myself. I’ve already had a couple moments of falling flat with my catless headers. I wonder if the issue will arise for me as well.

good luck!

 

Sorry to ask you have replaced the sensor you need?because R53 have two MAP sensors, you need to replace the right one mounted on Intake manifold.MAP sensor can work up to 26PSI.

 

I only replaced the MAP sensor on the intake manifold. The one one the thermostat housing looked pretty much brand new when I pulled it out. I do have a P1498 code, which is unmetered air after the compressor. Could that be caused by a vacuum leak?

 

So, turns out it was an easy and cheap fix. I noticed the vacuum hose on the intake manifold had popped off from the increase in pressure. So I picked up some vacuum fittings and replaced all the ones I could see. I also put a hose clamp on the one that had popped off to make sure it didn't happen again. I am able to rev over 4k, the P1498 code hasn't popped up, and the engine seems to be running much smoother!