Dsmlink Map Sensor Questions

[Raptor]

Well I don't claim to be any authority on the infernal 2G nor do I want to be, so I have a few questions based on several different things I have been hearing recently. I only have limited experience with the DSMlink so bear with me. The question is with the MAP sensor, Many people say it isn't needed with the DSMlink and I guess I knew that, I talked with Eric about it a few times lately and he says that there are reasons to keep it. He says it can use the map sensor for interpolated speed desity if the MAS is overrun. He also mentioned that it is used in determining load. I beleive he mentioned a few other things as well. I trust Eric on electrical/ECU stuff more than most anyone, but I am wondering what Shane or Mike think since they have been using it for a while now. Are there other pro's or cons to keeping the MAP sensor with it?

[Shane@DBPerformance]

It is a manifold differential sensor. It is used for EGR functionality testing. You can shut the CEL off in DSMLink. Even on a non DSMLink link 2G you can can remove it and it will throw a CEL, but it will not cause any problems. With the DSMLink, you can use the wires that originally ran to it and hook up a real 3 bar MAP sensor up to it and use it to datalog boost. Also, if you hook a real MAP sensor up to its wiring, then it can be used by DSMLink V2 to do the interpolated speed density to avoid MAS overrun.

[JET]

Shane is right on, just one more note: the OEM MAP sensor is only a 2 bar, so it only reads to 14.5psi of boost. The GM MAP sensor that Shane is talking about reads to ~29 psi of boost.

[Enes]

are they direct replacements?

-E

I welded map sensor to 1g manifold because I did not want to see annoying cel code everytime I drive or start. It will not cause a problem, but if you always have check engine light on, what if there is something really wrong, wouldn't you want to know what it is. I am always busy tuning or other things like driving. I just want a clean free dash with no dahm check engine light. It really is a personal preference. I have had a few occasions where a check engine light came on and so I checked dtc. Then solved problem.

[Raptor]

I knew about the EGR differential testing etc, and that you could kill the CEL with DSMLink, but I didn't realize the stock MAP sensor was at that low a cieling. So that eliminates any pro's that may have been associated with keeping it. Thats okay, it is pretty unobtrusive where it is now anyway. Now if I knew the DSMLink was coming before I bothered. Damn 2G's. :headache:

[LightningGSX]

Manifold differential and Manifold absolute, in this case, are functionally identical, so calling it a MAP sensor is just as correct as calling it a MDP sensor.I don't know why Mitsu calls it a MDP sensor, DP sensors are usually referenced to atmospheric pressure or have a dynamic reference, which would be worthless to an ECU.

The MAP is also used for checking for EVAP leaks, and I'm 50% sure it is used for calculating load in the 95 models and 99% sure it is used for calculating load on the 96+ models.