Hey guys,

I got referred to this site from a friend that's helping me plan out and install a supercharger on my '92 NSX - I've currently got the AEM EMS, and am trying to decide whether I can stick with the factory MAP sensor, or need to upgrade to AEM's 2bar MAP sensor.

I'll be running at tops 7psi of boost, nowhere near the 11psi that I keep hearing the stock sensor can handle. However, checking with AEM and a tuner that has done an install, they both say that the factory sensor doesn't provide a solid enough reading; that it can be jumpy and affect the tune.

What do you all think? Should the factory MAP sensor be good enough, or should I shell out the extra $150 for the AEM 2bar?

 

The stock map sensor that im using works great in boost.. But if you dont want to run that then look into the gm 3bar or the aem 2bar..

 

search around for a gM 2 or 3BAR map sensor. Its safer thant he stock for +ive pressure.

Greg

 

Hmm, is the GM 3bar "universal"? Does having a larger range (more bars) decrease the resolution of the sensor?

 

Well they are all 0-5 volt I think.. So adding more bars just makes the voltage gain more against the boost pressure..

 

I would either recommend of course the AEM 2 bar map sensor. However the GM 2 Bar map sensor will also work fine. The 3 bar will get you a little less resolution. Lets put it this way on a two bar map sensor you would be using almost the full range of the sensor 0-5 volts. On a 3 bar map sensor you would only be using 2/3 of the full range so you would only be using from 0-3.33 volts. Although you can rescale the maps to only read up to one bar of boost pressure the other part of the sensor would not be used so you would get less resolution out of the sensor. I hope I haven't lost you. Yes the GM map sensors are universal pretty much all sensors are as long as you have the calibration for them.

 

The 3 bar map sensors still run in the 0-5 volt range..

 

Thanks for all of the info. Where would you recommend shopping for the AEM or the GM parts online? Any preferred vendors?

From what I'm reading I think I'll try and go with a 2bar sensor (since the boost levels will be low).

 

tgreaves obviously you got lost in what I was saying. Yes it still reads from 0-5 volts, but where he is using it which would be up to 2 bar a 3 bar map sensor would not be using the last third to read. Less resolution. Read the post again.

Any authorized AEM dealer can get the sensor or you can order the GM sensor from gmpartsdirect.

 

It was the way you explained it.. It wasnt clear that you were talking about his application.. You said "On a 3 bar map sensor you would only be using 2/3 of the full range so you would only be using from 0-3.33 volts".. I took that as you were saying its a 0-3.33 volt range sensor..

 

just a note on the aem ems, make shure you have a good o2 we had trouble with two cars with lazy o2 that were tough to diag because the aem is more sensitive.
at full throttle it would cut out and stall. 94 civic hatch b16 super. 94 nsx twin.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drboost &raquo;</TD></TR><TR><TD CLASS="quote">just a note on the aem ems, make shure you have a good o2 we had trouble with two cars with lazy o2 that were tough to diag because the aem is more sensitive.
at full throttle it would cut out and stall. 94 civic hatch b16 super. 94 nsx twin.
</TD></TR></TABLE>

Did you calibrate the o2 sensor unit to the ems.. There is a gain setting that needs to be tweeked to make it correct..

 

the o2 was not switching at all after changing to a new one in both cases it ran mint.

 

Not switching you mean it just want reading at all.. Im kinda confused here on what the problem was.. Im running a Techedge 2.0 unit and it has always worked great and after I calibrated it works great with the ems..

 

Just wanted to say Thanks again, the 2bar AEM sensor should be in soon. Both O2 sensors were replaced less than a year ago, so I'd hope they'll still be in good shape.

 

Just a little word of advice stock O2 sensors tend to suck. Try to get a faster response UEGO sensor on the car.