Switching to 2 Bar MAP
 

GM 1 bar map sensor Linear and offsets for HPtuners software

MAP Sensor Linear: 94.43

MAP Sensor Offset: 10.34

GM 2 bar map sensor Linear and offsets for HPtuners software

MAP Sensor Linear: 207.66

MAP Sensor Offset: 9

GM 2.5 bar map sensor Linear and offsets for HPtuners software

MAP Sensor Linear: 244.68 kPa

MAP Sensor Offset: 10.21 kPa

GM 3 bar map sensor Linear and offsets for HPtuners software

MAP Sensor Linear: 329.41

MAP Sensor Offset: -6.35

GM 3.3 bar map sensor Linear and offsets for HPtuners software

MAP Sensor Linear: 333.33

MAP Sensor Offset: 33.33

Linked information from a website showing some map info

Thank you for the info, but I can't seem to find where I alter the MAP in the editor

https://www.hptuners.com/help/vcm_editor_parameters_gm_os.htm

​​​​​​​only info I can find on it with a screenshot, but I can't look as my laptop is down to find it.

Yeah, that's where I thought it is supposed to be, but it looks like the ECM I have doesn't support changes to the MAP sensor. The OS tab is completely blank. I don't think it has to do with updating or resyncing my hp tuners.

https://cimg4.ibsrv.net/gimg/monteca...597f4cb023.png

You aren't missing anything. The only way you can go about adding the 2-bar MAP is by installing a supercharged OS onto your car.

MAF tuning and a wideband for 1-bar if you don't want to do the OS switch.

That's what I suspected. I only plan on running 5-8 psi of boost, would I be able to run that with just the stock MAF and a wideband?

All of my research says yes, I'm still trying to dial in my car myself. These cars are very MAF based for everything it feels like.

Don't think you can since a 1 bar will only measure 14.5 psi at wot. Which is atmospheric pressure. Once you build boost it will be 14.5+4 or 5 psi which means map will be maxed.

I know any boost will max out the MAP, but it seems to me, and also acording to ChibiBlackSheep, the ECM relies more on the MAF than the VE table. At WOT when I'm tuning my NA car, I'm using just about three quarters of the HZ range of the MAF. Meaning it has the capability to measure more air. How much more I don't know. But it can be calibrated.

I just downloaded two files from the HPTuners repository. They're both supercharged Montes, an 04, and an 05. But in both of them, the VE table only goes up to 140 kpa, which is the same as my NA Monte. I know the files are from supercharged cars, cause the injector flow rate is scaled by manifold vacuum, whereas an NA is static. I thought the supercharged cars had 2bar MAP sensors, so shouldn't the VE table be scaled differently?

I'm pretty sure they have a multiplier in them that HPTuners can't access. I think TinyTuner + DHP was able to make some modifications to that, but they require BIN files and HPT isn't compatible with that stuff anymore.

That's weird though that it would be setup that way from GM. You'd think the sensor that is responsible for measuring pressure would have a table properly scaled to measure said pressure instead of just going to 140 kpa, and having a multiplier applied.

Would it still work if I took one of those supercharged files and did a write entire to the ECM?

I wouldn't necessarily say it was "set up that way by GM", this is just how HPTuners was able to read the computers. I believe other hex editors were able to make the multiplier changes.

You need to do an OS swap which was what I was saying earlier in the thread.

But hey, if you can figure out a simple way to do it, let me know. From what I gathered it's not possible without a new PCM and OS swap.

I stopped by a junkyard today looking for an ECU from a SC car but ran into a little issue. The only SC car there was a Pontiac GP which had this style of ECU:

https://cimg7.ibsrv.net/gimg/monteca...d507c0a202.jpg

My Monte has this style:

https://cimg9.ibsrv.net/gimg/monteca...45d277e54e.jpg

Do the 04-05 SC Monte's have the second style ECU that would be a direct swap?