I have installed my greddy E-manage now and are starting to mess around with it.
It gives me some options on what to use when tuening and I'm not sure on what kind of map(s) I want to use.

By default when installed without any options i can only map by RPM and Throthle sensor signal.

It seem to me (so far) that i can use 2 maps at the same time ..

so, my plan is to us a preasure sensor to measure the preasure in the intake to make a map for when im in heave boost, and also use the standard throthel or airflow map for "normal" mapping while not under excesive boost.

but ... the more I think of it the more it feels like its not needed, airflow will rise with boost thus makeing it possibel to "sence" that I'm in boost and add the correct amount of fuel with only Airflow and RPM, right ?

What do you use, and is there a "best" way to do this for turbo cars ?

/bo

 

Tap the stock pressure sensor signal into the grey wire, instead of using the Throttle position signal. The stock pressure sensor gives off between 0 and 5 volts.

Now that you've done this you have control over the afm signal based on boost. You will be putting in 16 points in the e-manage airflow map, and they will say Throttle position percentage, but really they stand for a certain pressure.

Like it has been stated the pressure sensor will give off between 0 and 5 volts. You need to set the TPS sensor so that 0 throttle = 0 volts and 100 percent throttle = 5 volts. Now, to find out how many volts the pressure sensor is giving off for any given boost level you use this equation:

Out(V) = 0.169V/psi*P(psi) + 2.318V

so for example 10 pounds of boost would equal

.169(v/psi) X 10(psi) + 2.318 Volts = 4.008 volts. We said that full throttle was 5 volts, so we just divide this result with 5 volts to find out what the 'Throttle position' will be that you input into the e-manage.

4.008/5 = .8016 or 80.16 percent. So if 80 percent throttle, corresponds to 10 pounds of boost. Since the e-manage has 16 x 16 maps, you can use 15 other boost reference points. Depending on what turbo and injectors you're running, you probably won't have to alter the fuel too much up until 8 or 9 pounds. You could even put values under deep vacuum and lean it out a little if you want to improve your gas economy a small amount.

If you have the injector harness, then you can directly add pulsewidth to the injectors. Really, you only need to start messing with that map if you are hitting a duty cycle limit imposed by the stock ecu.