Ranger Mods

Hi, early days with my MX+ & OBDLink app. I have 3 options for boost in the app, can't find a custom PID.
Boost (Calculated PID) displaying up to around 24psi
Boost Pressure Sensor A (SAE PIDS) displaying as high as 50psi
Boost Pressure Sensor B (SAE PIDS) which stays on zero

Which one(s) should I be looking at? Or something different?
And at what point should I be concerned.

Just trying to establish correct data and parameters so I can monitor while towing.

Cheers, Adam

Boost Calculated is what I use

Calculated

Hi all hope you are well. I’ve tried this and for some reason mine tops out at 22psi. My dyno sheet shows up to 26psi I think. Have I done something wrong? Should I be using another calculated pid?

26 seems excessive unless you have replaced turbo and intercooler. It is plausible the PID tops out at 22 but being I do not produce anymore than that anyway then I do not have an answer.

I think your dyno reading is too high
Never seen anyone able to go past 22, even with a tune on a stock motor.
If yours is not stock then maybe look at what has been done.

It’s got an aftermarket turbo and intercooler

Unless someone else tests otherwise then is it a limitation of the PID on a 3.2 PCM. Your only option then is use a gauge directly attached to the engine.

I have 2.2 PX2 which has the same SID209 and sensor arrangement as the PX2 3.2 as far as I know.
I don't use OBDLink App but perhaps the limitation comes from the PID they use to calculate/display boost pressure.
I use Forscan.
Forscan doesn't do calculated boost (gauge pressure) but displays absolute boost pressure.
What I found is the MAP PID was limited to 250kPa - realised this as it flatlined at 250kPa after boost was raised but tracked correctly at factory boost levels.
It would hit 235kPa and varying as expected with rpm, load, etc before the remap with a BARO pressure of 85kPa.

I found that TCBP PID (Measured Boost at Throttle Inlet Pressure Sensor) has a wider range.
It has hit a value of 262kPa and displays what is expected from the remaps boost adjustments.
I monitor the TCBP_DSD (Desired Boost Pressure) to confirm what is expected.
Max boost request I've seen is 255kPA but boost over shoots a bit due to exhaust derestriction.

Ok not sure - maybe the max is 22psi for some reason. Another weird one, about a month ago my fuel line under the car that goes from my tank to the fuel filter somehow disconnected and fuel was spilling everywhere. Is there a way to monitor this to see if the pressure drops to indicate that it’s happening again?

I have seen Fuel Pressure mentioned many times in the OBDLink app
It has many PID's but if there is one suitable for monitoring I couldn't say.

bernie.c wrote: ↑Tue Jul 18, 2023 6:36 pm Ok not sure - maybe the max is 22psi for some reason. Another weird one, about a month ago my fuel line under the car that goes from my tank to the fuel filter somehow disconnected and fuel was spilling everywhere. Is there a way to monitor this to see if the pressure drops to indicate that it’s happening again?

Try the boost PIDs I suggested and see.
The MAP one was definitely limited.