piratetim

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.

olderguy

iTrader: (19)

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.

piratetim

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.

Joe Perez

iTrader: (8)

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.

boostinsteve

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.

Joe Perez

iTrader: (8)

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.

trito

iTrader: (1)

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

Joe Perez

iTrader: (8)

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.