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Old 06-24-2011, 06:00 AM   #1
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Default Air Con and Tableswitch

Want to wire up my MS3 + 3X so that it switches tables when the A/C is turned on.
I have a 1995 1.8l Eunos.

How would I connect up the A/C to the 3X ?

My guess is:
2s to pin 20 (Inj H) on 3X
1j to pin 25 (Nitrous2)
1q to pin28 (Tableswitch)

I think Greg G has done similar.
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Old 06-24-2011, 06:32 AM   #2
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I think the tableswitching may be unnecessary for ms3 since it has the AC feedforward mechanism. But FWIW, my signal for tableswitching came from 1J. Then again, if you want to tableswitch before the AC is triggered, maybe 1Q is a better choice for MS3.

Can't help with pin specifics though :/
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Old 06-24-2011, 06:43 AM   #3
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Sounds like I may have my inputs/outputs crossed.

From DIY:
" Any of your on/off input pins (30, 11, 29, 28) may be used for A/C input, and any of your medium current outputs (24, 6, 25, 26, 27, but I'd save 9 for the IAC valve) may be used for fan or A/C output."

So, 1j is A/C input (I'll use pin 29 and save tableswitch for something else) and 1q is A/C output.
Attached Files
File Type: xls Squirt-pinsxls.xls (23.0 KB, 58 views)
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Old 06-24-2011, 07:02 AM   #4
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What? No 1q= input, 1j= output
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Old 06-24-2011, 07:17 AM   #5
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Cheers Greg, I'm starting to confuse myself here. Thought I had it right before.
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Old 06-24-2011, 11:08 AM   #6
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I'm running the latest code (not yet published as a pre 1.1 alpha) and the changes to the A/C system are incredible. Ken (muythaibxr) has added an idle speed target adder so you can both increase initial duty AND raise the idle speed target when A/C kicks on.

I still need some tuning on my EAE to get rid of the little lean blip when it kicks on but:

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Old 06-24-2011, 06:35 PM   #7
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I'm a complete when it come to logs but that does look really smooooooooth.
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Old 06-24-2011, 06:48 PM   #8
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Quote:
Originally Posted by y8s View Post
I'm running the latest code (not yet published as a pre 1.1 alpha) and the changes to the A/C system are incredible. Ken (muythaibxr) has added an idle speed target adder so you can both increase initial duty AND raise the idle speed target when A/C kicks on.
Arrrrggg don't tease me! That's the adder I'm trying to emulate with the extra solenoids


What does EAE have to do with AC engagement?

Last edited by Greg G; 06-25-2011 at 10:17 AM.
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Old 06-24-2011, 07:00 PM   #9
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A/C is adding a load (equivalent to a little extra throttle) so it sounds like he's added some code to use EAE to compensate. I could well be wrong though.
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Old 06-24-2011, 07:06 PM   #10
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EAE is always running.

you honestly don't need table switching if you have the MS3X idle up code. I use it, but when I disable there's no difference.
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Old 06-24-2011, 07:10 PM   #11
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As I suspected, no table switching needed with the idle duty adder...
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Old 06-24-2011, 08:23 PM   #12
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Thanks guys, my quandary has been well and truly answered. You're all superstars
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Old 06-24-2011, 09:03 PM   #13
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Hey y8s, could you post a graph with both AC and headlights on? Thanks
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Old 06-24-2011, 10:28 PM   #14
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I can't. it's not as good though. it pushes load up further than I have reliably tuned VE.

btw the EAE tuning is responsible for correcting for transient MAP events. if you have a little lump of lean when the load kicks up for AC, it'll fix it. same for little rich spots when it kicks off.
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