Hello my boosted friends! I have been using stock map sensor on my GT35R with great success at around 10 psi. I decided to add little more boost so I installed Omni 4 bar map sensor.

I used the calibration from their website but it's not working correctly:
Min 0
Max 4.8v
Load offset 0
Load scalar 4

I may have a faulty one but I want to first check with those who know. With those values, the map reading is at 0 psi with the engine off . The map reading becomes very jumpy at idle and low load area Unlike stock sensor where the reading moves up or down very smoothly.

Any input is greatly appreciated,
Pawan

 

Don't know if it helps but here is the Calibration sheet

 

That's what I've got and as Evan's said, map filter is at 15. Works great but now I'm paranoid and want to check my screws lol. Might be why my boost gauge reads higher than the map sensor

 

Thank you all for the info. My map filter is also at 15 so I will try reinstalling it.

300sx - It is common for the boost gauge to be a tad off. My boost gauge reads 11 or 12 psi when my stock map was showing 10 If your car is running fine then there's nothing to worry about

Pawan

 

^Right.

It's relative. Since your engine was tuned at '10' or '12' psi, it still runs with that particular setup. In other words, it can show 24 psi, but if actual is 10, and it was tuned at that pressure, whatever it is, it'll be fine.

 

Update. I just received a new sensor from Omni but I am still having the same problem

 

I have had two bad sensors from Omni. Sometimes the glue does not seal the case and they have pinhole leaks.

Check the voltage and load values and make sure they are correct.

 

Thanks Asura. Are you using the same calibration as the one I posted on top of this page?

 

Yes I am. Make sure to use the map filter =15 as Jeff Evan pointed out.

Please check the casing for surface cracks.