A friend of mine got a small module to install in his 06 dodge cummins truck and said it does Boost + pressure + timing. I went to hook it up for him and noticed there are only two plugs. One for the MAP sensor and one for the Fuel Rail Pressure.

Now I'am no performance professional but I don't see how those two sensors can do anything with timing advance. The only way I know of changing timing would be through the data port, OBDII port or programmer.

Any of you performance guys have a take on this? Can timing be changed through the MAP or Rail pressure sensors????

 

Several things occur for advancing the timing using a pressure box. One is the higher pressure. The fuel being injected through the nozzle at higher pressure will arrive into the combustion chamber slighter faster than stock, so the ignition of the fuel will happen sooner.
With the rail pressure being higher the ECM will advance the timing through it's preprogrammed fuel pressure/timing curve.

MikeyB

 

What did he buy?

 

Sounds like a Quad box.

Yes it alters timing just like MikeyB explained....

the bigger modules (TST, Edge) also alter timing using injector harness connections.....not the obdII port.

 

I'd rather leave the name brand out of the discussion, name brand really doesn't have a bearing on the discussion anyhow.

 

O.K. I'am beginning to visualize what's going on.
The ECM sees higher than normal pressure for a given data point so the ECM in turns tells the injectors to fire off at a slightly earlier time thus advancing the timing. That, along with increased rail pressure allowing a faster injection of fuel alters timing. Sounds plausable.

Any more to it than that?

Thanks,
Ron

 

You can do a LOT with timing and the MAP sensor.

More boost needs more timing......get it.