I dont think that the emanange maxes out at 12psi, rather the stock sensor does. So if you are running 12psi, would make a lot of sense to get the greddy map sensor, seeing at 12 psi you could spike or creep higher than that with different temperatures etc. Im guessing if you did go to say 12 psi and up the stock OEM sensor would not be letting your ECU know what the true manifold pressure is. Would be awesome to get a definitive answer, this stuff confuses the hell out of me.

 

The stock map maxes out at 11..ish. Someone smarter than me has figured it out on the board here. You should log your sensor though, as pushing a sensor to peak should be done empirically. Just FYI: the ecu never sees boost. The emu clamps the voltage the ecu sees to just under positive pressure. The reason you still need to be worried about reading boost, is because the EMU needs that reading to adjust the fuel and timing. If you max the sensor out, you are now adding more air than the emu can read. All the emu will see is the max value of the MAP sensor and think all is good while your turbo keeps spooling up. What does more air with the same amount of fuel equal? LEAN, detonation, and a big bucket full of engine parts. You can find the max value of YOUR sensor by using the greddy manager and logging the map voltage.

 

Thanks for that SqtB!

 

Can anyone tell me how to install the Greddy MAP sensory please?

 

I think you gotta look through the manuals on mohdparts.com > I'm sure I saw the instructions there, they were in JPG format.

 

The stock map sensor follow the equations Psi=5.495*V-15.65 so 5V =11.819PSI

The stock Honda sensor is actually very good, as it reads very slight changes in pressure and very quickly. Unfortunately by having this resolution and speed the total range is reduced and they are very susceptible to damage due to high energy pressure waves. These waves will cause the sensors internal diaphragm to stick which is why you need to wack it on occasion. Typically this would not be a problem when using the stock induction system which is typically tuned to reduce the power of the waves. Most auto makers use devises such as Helmholtz resonators and "tuned ari boxes and piping. This is why Greddy fro instance send s a snubber with its turbo kit. The snubber reduces the shock of high energy waves. So this being said I would recommend a new sensor to anyone with a modified inductions system.

Second, under the Emanage Parameter Settings / Vehicle tab you can change the type of sensor and use one such as Science of Speeds 3bar or others 2 bar. Remember pick the lowest sensor pressure range you can when selecting a new one. Since you only have a 0-5V scale this will allow for better resolution. Check out this article form PLX it may help you choose a cheaper sensor alternative.

http://www.plxdevices.com/AppNotes/PLXApp013.pdf

To set up the Greddy Pressure sensor you need to get the sensor, sensor cable and the Emanage option port harness. Open the Parameter Settings / Front Panel tab and select the option port that it is attached to and select Greddy Pressure Sensor. Don't forget to send it back to the main unit when your done. Now you get to rescale your maps to accommodate for the new voltage scale.

What Else You Got??

 

Excellent post. Thanks for the formula.