konmo

iTrader: (2)

in that case, I have a V1.3 board.

Dav1d

Is this thread dead? I got my MS2PNP AC Idle sort of working but I think the delay-up is not working well.

Matt Cramer

Well, this is the first anyone's posted in this thread for nearly two years now. What board version is this, and can you post an MSQ and data log?

Dav1d

Sorry for the delay. I had a Board exam yesterday and I had to fall off the grid for a couple of weeks to get ready for it. Today I made the Data log. In Open Loop Idle the AC kind of work but sometimes the car stalls when slowing down or stopping, with or without the AC on. With Closed Loop the car runs fine and doesn't stalls without the AC (with the AC the car stalls). I know the valve is working because I can control it with the "CAN bus.

PD. I'm using this site: megamiata.blogspot.com/2014/12/closed-loop-idle.html as a guide. But the car never the car idle never oscillates even with the gain to 200%

Matt Cramer

Please post the complete MSQ file - the problem may not be on that screen.

Dav1d

Here it is. The map is kind of crazy because I'm completely new to this. I've run Autotune a couple of times but I made a couple of changes trying to fix the rev dips and engine stalls (in "Open Loop") when going to neutral. But that got fix with the CLI "Soft Landing".

Matt Cramer

Try using some extra spark advance to "catch" the idle in the main spark table.

Dav1d

Thanks! I did as you recommended and that fixed the stall issues. But the AC still kills the engine. I don't know why the CLI is so complicated to adjust. I thought that every Miata IAC valve had to be the same and gaining control of it would be easy or well documented (since there are 100s or 1,000s if not more MegaSquirt Miatas). It is as if the ECU doesn't receive the signal that the AC is on because it never rises the RPM. But the compressor and everything else engages normally. I think I'll go back to the stock ECU while I gather the pieces to make my own turbo kit and take it to the local Tuner. But I'll really miss the couple of Ponies the MegaSquirt added I just wanted to have everything sorted (as recommended by most users here in the forum) before adding other variable to the mix. I just hope the Tuner is able to fix it. Here in PR Megasquirt is not as popular.

Dav1d

Uninstalling the Megasquirt I just noticed jumper J5/AC is open. Is this supposed to be Jumped. I still can't get any response from the AC Idle Up.

Dav1d

This is My board.

m5guy

Hi David, did you ever figure out the magic combination of Closed Loop Idle and AC Idle Up settings? I am having the same problem as you. My car is a 1994 1.8L NA running MSPNP2 with MAF delete, normally aspirated. I did not look at the J5 jumper on my board, but I have the same black jumper between the PE1(TS) and AC ports.

Basically I have a good Open Loop Idle tune, and my Closed Loop tune is okay but the ECU cannot "catch" the falling RPMs when I turn on the AC so the engine stalls. Here my baseline CLI settings and I've been playing with each setting to see if it would activate the AC rpm adder in the AC Idle Up menu, but so far no luck.

Anyone else who has a suggestion - feel free to chime in. I am in the trial and error phase of CLI and I can always switch back to my solid OLI settings if my latest experiment does not work.

Dav1d

Well I got it to work. But I'm no expert. I changed a lot of things in the base tune supplied by megasquirt. Below are the ones I think got it to work. But please remember I really don't know much about what I'm doing here. The J5 jumper is meant to be left open (as advised by the diyautotune support team). Regarding CLI I followed Megamiata blog to guide me. In my case I think the main problem was that in the version of Tunerstudio that I have there is a setting called "Idle-up min Rpm" and the description says that it is the min RPM for the compressor clutch to engage. But it really is the min RPM for the "AC Idle up" to work (which I think is useless but I'm no mechanic) and I had it set to 950 RPMs while my car Idled at 825 RPMs Aprox which meant that "AC Idle Up" function was turned Off while idling. After making the changes in the images below (time advance, PWM voltage, ETC.) I set it to "Idle-up minRPM" to 100 (as advised by DIYautotune). Then ran "Autotune" while Idle with the AC on (giving it a little help with the throttle the first couple of times because I've always ran Autotune with the AC off) until Autotune fixed the map according to the extra load on the engine. It ended a little richer in idle but now it works. It stills stalls from time to time when turning the AC on, and the car hesitates a little every time I turn on the AC (The support team said that the MSPN2 is not powerful enough to delay the time of the AC compressor clutch to activate). But its working. Remember that I have a '99 Miata things could be different in your setup. In my case the Idle Up input polarity is High (I noticed yours is set to low) I don't know if this changed from NA to NB but maybe that could be the problem. Hope this helps.

m5guy

Hi David, thanks for the fast reply. I am just getting familiar with TunerStudio and will search for the maps you displayed. It was helpful to see what your AC Idle Up and CLI settings are too. In the spirit of the MiataTurbo forum slogan, here's a fat cat picture as a thank you!

Dav1d

Glad to help

guacamole

FWIW, on my '95M v1.2 (RED motherboard) I had to turn the potentiometer almost all the way counter clockwise to get mine to idle w/ a.c. If i turned the dial all the way CCW, car would idle ~1750, but a tick less (vertical engraved line) and car idles nicely w/ A.C. ~1K RPM, still needs a blip to get going no matter what the dial's settings.