MS2PNP Air conditioning idle-up
#1
Cpt. Slow
Thread Starter
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,202
Total Cats: 1,138
MS2PNP Air conditioning idle-up
Been playing around with the closed loop idle control with a MSPNP2 and a '94. Works awesome, but the AC idle is definitely reacting to the draw of the compressor, not predicting it.
Is the ECU already wired for the AC idle up? Or do I need to wiring something from the AC button to the ECU?
Here are the default settings I have once I activate AC idle up:
And the drop down menu choices for which pin I should use:
Is the ECU already wired for the AC idle up? Or do I need to wiring something from the AC button to the ECU?
Here are the default settings I have once I activate AC idle up:
And the drop down menu choices for which pin I should use:
#4
Cpt. Slow
Thread Starter
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,202
Total Cats: 1,138
Perfect, thanks. This quote pretty much sums it up:
It was running on 3.2.1 yesterday, but it's now on 3.3.1. But does the older MS2 still have the potentiometer to use the AC idle up?
I guess I'll have to wire it, as the owner does not want it to be reacting to the ac draw, he wants it predicting it.
I guess I'll have to wire it, as the owner does not want it to be reacting to the ac draw, he wants it predicting it.
#5
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,499
Total Cats: 4,080
how is it wired now?
to be reactive, you need to wire the INPUT into the MS, and then allow the MS to control the OUTPUT.
it wont turn on the compressor until after you idle up delay. If it's not wired in this manner, I'd remove the delay completly.
to be reactive, you need to wire the INPUT into the MS, and then allow the MS to control the OUTPUT.
it wont turn on the compressor until after you idle up delay. If it's not wired in this manner, I'd remove the delay completly.
#6
Cpt. Slow
Thread Starter
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,202
Total Cats: 1,138
We've unplugged the stock ecu, and plugged in the MS. That's how it's wired.
So you're saying the output is the compressor? And I need to lower the delay for it to catch the idle sooner?
is there any software changed I can make as to how much it raises the idle valve? Or is it purely hardware?
So you're saying the output is the compressor? And I need to lower the delay for it to catch the idle sooner?
is there any software changed I can make as to how much it raises the idle valve? Or is it purely hardware?
#9
Cpt. Slow
Thread Starter
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,202
Total Cats: 1,138
Good to know. If I had to guess it's a V1.2, it has the original 3.2.1 firmware and has been purchased for quite some time now. I'm guessing it'll say on a sticker on the box? Haven't looked at it yet.
But assuming it's a V1.2, have any insights?
Scott, adder% is a software setting or the hardware setting we've discussed? My question is how to make the AC idle up work, aka: what input/output pin to select, if it's wired in through the stock harness.
But assuming it's a V1.2, have any insights?
Scott, adder% is a software setting or the hardware setting we've discussed? My question is how to make the AC idle up work, aka: what input/output pin to select, if it's wired in through the stock harness.
#10
SADFab Destructive Testing Engineer
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
http://www.megasquirtpnp.com/docs/mspnp_g2_boardID.php
Looks like its a different rear connector between board revs.
For the adder percentage: If its a V1.2 then no software settings to configure. Just adjust the dial in the picture I linked above.
V1.3 default uses the table switch input. But can be changed with a jumper.
Looks like its a different rear connector between board revs.
For the adder percentage: If its a V1.2 then no software settings to configure. Just adjust the dial in the picture I linked above.
V1.3 default uses the table switch input. But can be changed with a jumper.
#13
Supporting Vendor
iTrader: (33)
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,659
Total Cats: 134
If it's the V1.2, you can set the a/c on idle bump by rotating the marked trim pot on the mainboard. We did it this way because it is simple for the end user to implement and works pretty well, and because that way it wouldn't use any I/O. However everyone wanted to be able to configure in software, so we changed it in V1.3. I personally prefer the older method, but it's not what you guys wanted, and we wanted to deliver what was requested of us.
#17
https://www.dropbox.com/s/rowtmvnqcs...erbnb.msl?dl=0
Not sure if I'm allowed to do this, but here is the log. I had to upload it to dropbox. I have the high idle since after cranking and I turn off ac idle advance around 4 min into the log. You can see my idle rpm goes down to my set 950
Not sure if I'm allowed to do this, but here is the log. I had to upload it to dropbox. I have the high idle since after cranking and I turn off ac idle advance around 4 min into the log. You can see my idle rpm goes down to my set 950