Greddy 4-bar sensor
 

I just ordered emanage ultimate and boomslang harness for my oo'. Do I now need to order whats called a 4-bar sensor so that I can remove my MAF based system and run MAP? If so where should I buy this and how do I wire it in.

You can buy the Greddy pressure sensor and it will plug right in and read correctly; or purchase any other MAP sensor and compensate for the difference in voltages they put out and make a connector(see archives).

Either way, you must have a MAP sensor to eliminate the MAF.

ok, second question is do I have to get a pressure sensor that is universal but for the EMU or is there a sensor that is for miatas and the emu.

There is only one 4-bar MAP sensor for all EMUs. It's about halfway down this page: http://www.mohdparts.com/emanage/index.html Search for P/N 16401301 and also buy the harness listed just below it.

I bought one of the motorola 2.5bar map sensors that they use in the megasquirt, and mademy own connector. I bought the connector from compusa. Altogether, had about 23 dollars into the project total.

Yes, you can technically use any 2bar or 2.5bar MAP sensor with the EMU, so long as you don't mind doing the voltage-to-pressure conversion in your head. When I first tried using a 2bar, I kept a printed conversion table taped to the side of my monitor at all times.

Problem is that the EMUs input only scales between 0.5 to 4.5V. 2 and 2.5bar sensors OTOH usually scale from 0 to 5V. So they can't be used for AFM removal.

Personally, I don't think the aggravation of dealing with something other than the Greddy 4 bar sensor is worth the $60 savings, given the limitations imposed by the EMU software.

Sorry for digging up an old post but the sites I've been looking at has the Greddy Pressure Sensor (16401301) @ 3Bar not 4. Can anyone else confirm this for me please.

sources:

http://www.greddy.com/products/displ...SubCategory=48

http://www.frsport.com/Greddy_164013...ss_p_8164.html

http://www.xenon-tuning.ee/ee/index....m=1995&to=2000

16401301 is a 4 bar sensor. The only reason I can think of to refer to it as a 3 bar is that it senses 3 bar of boost above atmospheric.

Imagine that I have a boost/vac gauge which goes up to 15 PSI. In reality, the gauge has a total range of about 30 PSI, because it starts at absolute vacuum (-14.7 PSI) and goes to +15 PSI above atmo, with "zero" (atmospheric) in the middle.


edit: further reading...

Yeah, here we go. Read the marketing copy from that FRSport place:

"The sensor is a complete sensor module that can go up to 3.0 kg/cm^2 (that's about 43 PSI)."

They're talking relative PSI, not absolute. 43 PSI relative is 4 bar absolute- three above, plus one ambient.