Author Topic: e30 325 turbo - switch config for A/C  (Read 8373 times)

Offline DevInAz

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e30 325 turbo - switch config for A/C
« on: July 07, 2013, 01:11:42 am »
here is a small project that I installed VEMS on to.  This car had a WAR chip installed with a air mass meter conversion but I guess it never ran correctly.

It came to me with no ECU so I installed a VEMS 3.6.

This car is running 42lb injectors with stock ignition and a custom turbo kit that the owner installed himself. I only added a M54 idle control valve, m50 TPS and IAT sensor from the webshop that is an open element.








The only problem I ran into with this car was the A/C engaging. It was a much larger load on the engine than normal, and i'm not sure why.  I changed the PID values and ref table but it wasn't enough.

Since this compressor on signal is a 12v and I couldn't use that as a input to the VEMS I installed a relay.

pin 85: 12v from compressor on
pin 86: body ground
Pin 30: ground from sensors EC36 pin 26
Pin 87: to EC18 pin 2 analog channel 5 (pull up 5v)

Now every time the A/C is switched on used the same config as before but raised the idle by 100rpm and raised the IAC ref table up about 10 points across the board.  This made a big difference in the way the car drives, before when driving at low rpm you could feel the compressor cycling on and off, now its nice and smooth.


https://www.box.com/s/vw6h4uk5ao76994224vt

Offline gunni

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Re: e30 325 turbo - switch config for A/C
« Reply #1 on: July 10, 2013, 08:28:25 pm »
Well executed solution .

I´ll be in Vegas tomorrow!!. Only in the airport going to San Fran though. Otherwise I would have looked you up!

Offline DevInAz

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Re: e30 325 turbo - switch config for A/C
« Reply #2 on: July 11, 2013, 03:48:53 am »
Are you coming back through Vegas? Delay your flight for a day. You have my email.

We will take you out for a night!

Offline gunni

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Re: e30 325 turbo - switch config for A/C
« Reply #3 on: July 15, 2013, 08:07:10 pm »
I wish I could have known that, car didn´t arrive on time so weekend was mostly as waste.

I´ll be flying out of San Fran rathern Vegas. I´ll try next time around !