So, I dropped my engine out yesterday and found my bracket for solidly mounting my ZR1 MAP sensor had lost it's attachment nut and from the oil residue on the back of the intake, it's been leaking boost. The factory grommet never fit my FAST intake very well anyway, which is why I made a bracket to clamp it to the intake.

So, the question is, how much boost could really be leaking out of that small hole, and since it's attached to the map, how far off would my MAP readings be? I'm probably going to have to redo my tune when I get it back together, because I have no idea how long it's been loose. Anyone know a good source for silicone grommets that are bigger than factory?

 

Can't really help you but I'm interested in this as well. I've always questioned how loose my map sensor felt when it was installed.

 

I fixed the issue today, bought some silicone plugs and drilled one out and cut it to size. Added a nylon locknut to my bracket so it doesn't come loose again.

 

I drilled and tapped my FAST intake for a hose barb and remote mounted my MAP sensor years ago. No more issues.

 

While that would work, I already had this setup and wanted to get it working better. Still am curious just how bad the boost leak around the grommet would be.

 

I have this bracket on my truck, and I have a distribution block with with quick connect push to lock to an fittings on the hose.