Need help setting up 3.5bar map sensor on aem

[tlicense]

psi at the moment but it's possible to change that to kpa or any other unit for that matter.

As you said it's simply a linear voltage thing, so as long as the calibrated value that corresponds to a certain pressure is the same (ie 1 bar calibrated before = 1 bar afterward) then I really shouldn't be having a problem should I?

I really do think it's a wrong part issue, as I've meticulously followed the AEM how to change your map sensor guide and it's just not working for me. I may well need to go and buy a pressure gauge and hand pump and calibrate this sensor myself.

Cheers

Tony

[eyefi]

Originally Posted by [b

Quote[/b] (tlicense @ Sep. 03 2004,10:52)]As you said it's simply a linear voltage thing, so as long as the calibrated value that corresponds to a certain pressure is the same (ie 1 bar calibrated before = 1 bar afterward) then I really shouldn't be having a problem should I?

exactly fella.

ive made a voltage vs pressure table for one with a boost gauge, volt meter and a syringe. make sure u get it right though, id much rather use the factory table.

[tlicense]

These pressure sensors are linear right? I'm getting 1.73 Volts at 0 Kpa Gauge and 4.5 Volts at 250 Kpa. From this I can create a straight line graph which I can then use to create a calibration for this sensor yeah?

[eyefi]

i wouldnt assume anything it could well b a curve.

what's the table like that is loaded by the wizard?

thinking about the part number, why would the same sensor have a different part number?

[tlicense]

Have managed to sort this.

Basically the stock MAP sensor had been set-up incorrectly when the AEM was originally installed. The min voltage was 1.00 V instead of 1.09 v. What this meant was when I was switching to the 3.5 bar map the map had a .1 volts offset. This meant that the load scale was effectively 0.1 volts worth of load off.

I modified the 3.5 BAR sensor calibration by the 0.1 volts and everything cleared up. The AFR went to exactly what it was beforehand.

So effectively I've moved the loadscale up by 0.1 volts but what I really need to do is move all the maps down by 0.1 volts, as currently the sensor is 0.1 volts above atmospheric when the car is at idle (about 1.2 psi IIRC)

Thanks for your hepl eyefi.

Oh yes almost forgot. Apparently all pressure sensors used in the automotive industry (Well all the honda/nissan/GM/Toyota and AEM ones) are linear.

I also found out about the part numbers (via a phone call to AEM in cali) 30-2112 is the part number of the kit (sensor and lead) whereas 35-2112 is the part number of the sensor itself.

Cheers

Tony

[Martin F]

Originally Posted by [b

Quote[/b] (tlicense @ Sep. 03 2004,21:13)]This meant that the load scale was effectively 0.1 volts worth of load off.

That would kind of make sense. Also i'd say its a good indicator to anybody attempting to map their own car with very little knowledge how such a small thing can cause such a big problem.

Good that AEM are so supportive as well.

[tlicense]

Totally agree with you Martin.

The thing I'm finding very difficult at the moment is that my car has effectively been mapped by about 3 different people.

If I had created a completely new map all by myself I wouldn't have run into this problem.

Never mind we'll get there in the end!