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Air Condition Idle up with 2-speed fan (MSPNP Gen 2 V1.2)

  • Thread starter Thread starter 93CobraUSAF
  • Start date Start date May 3, 2020
9

93CobraUSAF

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Sep 14, 2019
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May 3, 2020
#1
  • May 3, 2020
  • #1
Greetings to all,

As titled, I am currently running the MSPNP Gen2 with V1.2 (older version with minimum outputs).

I've recently moved to a hotter climate area that requires me to use A/C.

As mentioned, I have the older version of the MSPNP Gen 2 with required me to disable the pin 85 from the WOT relay.

Currently and independantly, I'm running a 2-speed fan (Mark VIII, Thunderbird) using a Volvo 2-speed controller and a BMW sensor (low/high) with a relay to control the A/C.

I would like to have the MS control the fan speed because as of now, when I turn on the A/C, it puts a load on the engine whereby the RPMS dip to the point where it wants to/and dies (basically, the idle does not ramp up to compensate for the additional load, and therefore the engine wants to die).

From my understand, the MS V1.2 has additional output controls (2-5) that I can program. I could figure out to set up the low and high speeds, but my question is "how toprogram to compensate for the additional load when I turn on the A/C?"
 
9

93CobraUSAF

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May 3, 2020
#2
  • May 3, 2020
  • #2
I've attached the file for your review.

I can run the wiring, just need help with the programming.
 

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  • CurrentTune.msq
    CurrentTune.msq
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a91what

SendMeUrDataLog
10 Year Member
Apr 6, 2011
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May 3, 2020
#3
  • May 3, 2020
  • #3
Pin 10 of the stock ECU has a 12v+ trigger when the AC is on. The ms2pnp (not sure about your version) has this input wired to tableswitch input through a transistor to protect the input. You should be able to setup the AC idle up function.

Do some looking and get back to me. This has no affect on the wot relay but we could incorporate that back in using one of the outputs you have available.
 
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93CobraUSAF

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Sep 14, 2019
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#4
  • May 3, 2020
  • #4
Thanks for the quick response....

I did some looking around, and here's where I'm at. I apologize for my ignorance up front....

Now, are you saying that I can connect pin 10 to the Table Switch Output (pin 12) on the MS2PNP? Or will I have to run a relay?

Based on diyautotune's website concerning the MS2PNP Gen 2:






As for setting up the 2-speed fan, does this look correct? For the high speed, I also want to enable it when I turn the A/C on...how do I set this up? or can I?




Thanks in advance.
 

a91what

SendMeUrDataLog
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#5
  • May 3, 2020
  • #5
That will require watching the port status, the tableswitch input should be connected to pin 10 inside the ecu
 
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93CobraUSAF

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#6
  • May 3, 2020
  • #6
Still confused.
 

Blown88GT

Founding Member
Nov 13, 1999
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Palm Beach Gardens, FL
May 3, 2020
#7
  • May 3, 2020
  • #7
93CobraUSAF said:
...

I would like to have the MS control the fan speed because as of now, when I turn on the A/C, it puts a load on the engine whereby the RPMS dip to the point where it wants to/and dies (basically, the idle does not ramp up to compensate for the additional load, and therefore the engine wants to die).

From my understand, the MS V1.2 has additional output controls (2-5) that I can program. I could figure out to set up the low and high speeds, but my question is "how to program to compensate for the additional load when I turn on the A/C?"
Click to expand...
Only a soft start PWM controller will fix that. You then don't need the high & low speeds terminals on the Mark VIII.
The WOT & A/C idle up can be controlled by the MS, independent of the controller.
 

a91what

SendMeUrDataLog
10 Year Member
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#8
  • May 3, 2020
  • #8
No it's totally fixable with idle advance and some other settings.
I will detail when not on my phone.
 
9

93CobraUSAF

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#9
  • May 3, 2020
  • #9
Much appreciated!
 
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