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Old 08-21-2007, 04:26 PM   #21
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That's fine, there has only been one released map for the MM9495 thus far. I'm driving our 95 car daily right now and I may make a tweak or two to the idle control settings based on some feedback and my testing, if so I'll post the new map and of course you could just bring those settings over. I'm not having the same issue you are though and I do think yours is likely on the map-- it will require a bit of fine tuning from car to car but I think we've got it really close. I probably put more work into the closed loop idle than anything else, it takes a bit of work to get just right. Make small changes and only one at a time, saving maps off so you can roll back if needed. And you need to test with and without the AC on. The AC will put you in a slightly different area of the map.

Notes when tuning close loop idle-- setting the reaction times too slow makes the idle valve sluggish and not react fast enough to catch the idle speed when it strays, setting it too fast makes the idle tend to oscillate. Also setting the deadband too low (trying to control the idle to too tight of a rpm range) will make it tend to oscillate. The idle settings in the MSPNP base map are very close to spot on, only minor adjustments (read: tiny increments) should be needed car to car. The maps of course need to be dialed in on a car by car basis, though they'll be close for many cars and maybe even spot-on for some near stockers.
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Old 08-21-2007, 08:16 PM   #22
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Thanks Jerry.

I would just add that this is a very minor issue for me. I am thus far overwhelmingly pleased with the performance of the MSnS PnP and the quality of the base maps. Previous experiences with a WRXLink standalone were not half so positive. The driveability of the car is, frankly much better than I had anticipated right off the bat.
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Old 08-23-2007, 09:59 AM   #23
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Guys, I have got everything working on mine with the exception of the AC. Can anyone point me to the schematics that show what needs to be done to get the MS controlling the AC? Please?

This is for the MS I kit.

TIA!
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Old 08-29-2007, 10:21 PM   #24
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Quote:
Originally Posted by da Bajan View Post
Guys, I have got everything working on mine with the exception of the AC. Can anyone point me to the schematics that show what needs to be done to get the MS controlling the AC? Please?

This is for the MS I kit.

TIA!
BUMP for someone looking for same information...
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Old 08-30-2007, 06:29 AM   #25
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Anyone still reading this thread?

I you please stop this and don't . I just feel , and want to feel

Please help!
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Old 10-19-2007, 06:36 PM   #26
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has anyone been able to get this working? the MSPNP is able to control AC. perhaps the good folks at DIYAT can share how it is done...
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Old 10-19-2007, 06:49 PM   #27
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We had to build a custom circuit to take the input from the AC and convert it to something that could control the relay for the MSPNP... I wish it was as simple as just wiring the switch straight to the relay but it wasn't. We spent a good part of the original MSPNP MM9093 development cycle designing and testing that and getting it right actually...

Last edited by FoundSoul; 10-19-2007 at 07:53 PM.
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Old 10-19-2007, 11:34 PM   #28
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Quote:
Originally Posted by FoundSoul View Post
We had to build a custom circuit to take the input from the AC and convert it to something that could control the relay for the MSPNP... I wish it was as simple as just wiring the switch straight to the relay but it wasn't. We spent a good part of the original MSPNP MM9093 development cycle designing and testing that and getting it right actually...
I solved the problem. Remove the PCM from the equation. Put a microswitch on the throttle just like a nitrous trigger, get it adjusted so pretty close to WOT closes the switch. Viola.
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Old 10-20-2007, 08:59 AM   #29
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Quote:
Originally Posted by elesjuan View Post
I solved the problem. Remove the PCM from the equation. Put a microswitch on the throttle just like a nitrous trigger, get it adjusted so pretty close to WOT closes the switch. Viola.
That is what i would have done as well good thinking. It is just so simple i bet it might work very well
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Old 04-07-2008, 03:22 PM   #30
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I wanted to bring this back from the dead as I'm having a wonderful time trying to get A/C working factory smooth on a friend's '91 NA.

Here's what I've discovered with the factory ECU pinout and a my own measurements:

PIN 1S: Low (0V) when fan is in positions 2,3,4

PIN 1Q: High (+12V) when the A/C switch is pressed and the Blue light is on.

PIN 1J: A/C clutch relay: Ground this (set LOW) to engage A/C clutch and fans.

I assume the intent was this:

Only allow the a/c to run when the button is engaged (1Q) and the fan is in positions 2-4 (1S) to prevent the evaporator from icing.

Give the ecu absolute contol of PIN 1J (clutch activate) to allow for overheating, better acceleration, protection from over-speeding, anything else?

I was working on a two-transistor, 1 megasquirt output solution to the issue this weekend. My circuit was only intended to be able to shut A/C off, turning it on was the duty of the button and fan switch on the dash. So far it doesn't work. I appreciate input from any of you that have a deeper understanding.

From my own observations, 1S is 0v when you want A/C on and 1Q (the button itself) is 12V, and 1J requires 0V to GND out the relay and switch the A/C. So, if you want to bypass the ECU, minimally, you have to invert the signal from the A/C button on the dash (from 12V to 0V) and stop caring about frosting and overloading the system. How this is done with a throttle switch might need some explaining.
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Old 04-09-2008, 03:55 AM   #31
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This is how I did it. Note that the diagram there is incomplete - the whole thread's a work-in-progress but it's how I got mine working.

Rig up the pressure switch to the AC relay and the condensor fan. That was it.
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Old 05-30-2008, 05:07 PM   #32
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Anyone still here? I'm trying to get my car to idle with the a/c on. I think the blower is pulling too much power from the engine...
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