MoTeC Global Forum

Last season i had full closed loop boost control. This season i added a separate boost sensor. I calibrated it correctly and now have a channel for boost pressure and also boost pressure sensor. Last season with just the map sensor the boost pressure read as it should- 0 psi with key on eng off. Now this year the boost sensor channel reads the same at 0 psi key on eng off but my boost pressure channel reads -14.7psi.

So now when i get into boost the system does not activate. It seems the m1 is using the boost pressure channel instead of the boost pressure sensor channel. On log i i can only get 8psi (gate spring pressure) becuase the boost system does not actuate. The ecu sees -6psi when the boost sensor sees 8psi so it doesnt hit the 3psi needed to activate the system. Any ideas? If i go back to just the boost pressure channel it works as it should.

2016 m1 plug in system for the skidoo xs1200

Hi,

Which sensor are you using? it sounds like you are using a MAP sensor that is reading an absolute value, rather than a gauge value. Can you change the translation table for the sensor so that the sensor reads 0 when the engine is off?

My boost sensor translation is:
1.720v=-0.8psi
4.99v =28psi

My boost pressure sensor channel reads 0psi with engine not running. The boost pressure channel reads -14.7psi with engine off. When i run no boost sensor, just the bosch tmap, the boost pressure channel reads 0. So it seems i cant run a separate boost sensor??

I am using a bosch tmap sensor 0281 002 845
I am using a gm 2 bar sensor for the boost sensor channel with the translation i mentioned in the prior post.

Everything works fine with just the bosch tmap. When i addbthe boost sensor channel it works fine but the boost pressure channel changes. Not sure what is going on

I think i figured it out. I calibrated the boost pressure sensor a a guage reading when its absolute. Now when i calibrate the boost pressure channel as guage it works out. Thanks for the reply!