The boost reading is taken directly from the ECU, it's not calculated from any other values.

If you want to "fake" a different reading, of course for amusement only, then you would have to setup a custom PID (accessible at the bottom of the settings) using the OBD2 wiki page (Search google for 'OBD2 wikipedia') as a guide, then for the formula use something like:

A + 100

where 100 is the 'faked' amount, and 'A' is the actual value returned from the ECU.

Regards,

Ian

Okay, i figured it out. I couldn't find any PID for a boost reading for my car, Dodge Challenger 2010... however the built in PID already in the app did read correctly around -12 at idle(non turbo/super charged car). Since I don't have a boosted car that is why i assumed it was already some sort of calculation on your part.

What i did was use 01 0B to grab the intake manifold pressure, then did the following equation.

A * .14503773773020923 - 12 (where 12 put the appropriate outside pressure, as boost/vacume is outside pressure vs inside pressure).

Then to mess with the boost/vacume reading just adjust - 12. I essentially adjusted it to take away less so that my boost starts right below 0, so when i hit the gas it jumps up to around 9 psi... giving the appearance of a turbo/super charged car.

Fun because i was bored and I wanted a gauge that looked like it was doing something.

I am intrigued by your boost calculation requirement. I think calculation may be the right approach to create a virtual dial for my car.

I am preparing the installation of a supercharger in a 1999 Audi A6 2.8L engine. There will be a new engine map for the new fuel injectors, but the engine control unit (ECU) has no sensors for reading boost. However, the MAF sensor "knows" the intake rate and the ECU "knows" the throttle position as well as the instantaneous RPM. Since the supercharger is downstream from the MAF sensor, all the total mass of the air that goes in the engine is known.

I imagine that there is a way to calculate the proportion (either in Bar, or more tricky in PSI) over naturally aspirated that will get me the effective boost reading.

All the sampling techniques, frequency of calculation and frequency of display update would have to be scaled to fit within the capabilities of the Torque app and the processors common to mid-level Android phones (I'm using a Samsung Moment). Nevertheless, it seems this is achievable.

I'd love to get this on my Android phone rather than running a vacuum/boost line into a conventional 52mm gauge.

What do you think?