Does anyone have a good running Mega Squirt tune/maps for a stock or close to stock 305 TPI (mine is an '87 LB9 + 5 speed, I'm running an MS2 extra on a PCB 3, but even maps from another version would be helpful) that you can share with me?

I'm starting to suspect that I'm having hardware issues.... I finally got it starting and it runs for a little bit (maybe 5-10 seconds with the idle on the high side and then quits like it was turned off. I can goose the throttle, and it still dies like it was shut off, I've tried adding some timing and/or fuel below that rpm to "catch" it from stalling and nothing (adding timing made the idle better for those few seconds, but it still acts like it was shut off).

I'm hoping that if I saw someone else tune and/or maps and put them in my MS I should have something that the car should at least run on, and then I can figure out if it's a setting, the maps, or a hardware or physical problem with the car.

 

Also, is there a way to go back to the original out of the box settings and start over? I'm somewhat wondering if I might have changed something bench testing it that I can't seem to find now.

 

Just a shot in the dark, is your timing offset correct in your megasquirt?

I think if you start a new project it goes back to the standard 350 settings. Correct me if im wrong.

 

I can't get it to run long enough to check the timing offset, and I boubt that is the problem anyway- I started with an offset of 10, lowered that to 5, it acted the same, lowered it to 0 it acted the same, raised it to 15 and it seemed to run a little better but it still died after the same exact time period. The base timing is set to 8* with the stock ECM plugged in and the esc unplugged. I seriously doubt that my actual offset is more than 15* or less than 0* if the same mechanical/electronic parts (distributor, HEI, ignition box...) read a stable 8* with the factory ECM connected.

 

If you start a new project it connects to the MS hardware and loads what is set on it. Like I said, I tried that...

 

True, forgot about that. If you save your current msq and start a new project while disconnected from the ms, once you connect you can burn the stock tune I think. Ive never really tried it that way and like you said you already tried.

Anything heating up in the MS itself? Maybe going into thermal protection? One more question, did you run an MS1 processor at anytime then upgrade to an MS2 processor?

 

What are you using for tach input to the megasquirt? Are you using the HEI mod from DIY autotune?

Also LOGS ARE YOUR FRIEND. make sure you log as much as you can. Even if it doesn't run. Looking back through logs can really make your life easier to help pinpoint problems.

PM me you email and I can send you my latest MSQ when I get home. It is for a mild 350 but should run a 305.

 

Nope, it won't let you start a project without connecting to an MS. I found that the firmware updates come with a generic .msq, which you can copy in place, but even with that somehow it still had _some_ information about the earlier setup in it, don't know where it was getting it.

Heat- doubt it, it hasn't been powered up long enough, don't know what thermal protection looks like but the MS itself remains connected the whole time, I guess it's not exactly like shutting the key off, it's just acting like it.

MS1 to 2 processor- I don't remember. I built this thing like 5 years ago, and had it running on another car for a short time, it currently has a MS2 on it, but I don't remember ever having an MS1, but I do remember doing the upgrade in the directions and I've reflashed the firmware a few times (once recently, when I pulled it out of the closet to use for this project it wasn't powering up correctly and reflashing it fixed that).

I tried it both ways, like the MS assembly and TPI adapter instructions suggest (XG1 - XG1 jumpered, and the opto jumper) and then I removed the jumpers and made up my own HEI mod (applying 5V power from the proto area with a 100ohm resistor and the second jumper, since my V3 board is an older one without jumper headers I had to solder and hurt one of the through hole barrels, but got it wired and tested OK, so for now it's staying that way since I'm afraid of causing much worse problems by going back).

Any thoughts what the dwell and spark duration should be set to? Default is something like 3.1 and .9ms, one set of instructions that I found suggest that you want a "very short dwell, under 2ms," and another suggests a dwell of over 3.5 and a spark duration of 1.7... seems like all the documentation I find is either totally contradictory or doesn't match the configuration options that exist in the current Tuner Studio (both issues are getting me pretty frustrated)

I'll have to look, but I don't know what logs will help if it doesn't run...

PM you in a second...

 

Logs will always help in one way or the other. What was the other car it was running on?

Im using HEI 7-8 pin ignition as well, my running dwell is 3.2 if it helps. Typically anything over 4ms running dwell will get hot quick.

Ill let you know my settings in a little bit when i look over the log I took tonight in my car

 

I found this YouTube series by Philip Ringwood very helpful for setting up a basic tune.
https://www.youtube.com/user/ExtraEFI/videos?view=0

 

Check your afterstart and warmup enrichment settings. Too much or too little fuel in either, but especially the afterstart, will cause this.

 

If you still have issues, I have my tune from my previous 350 but for MegaSquirt III. Map for fuel and spark will be different but other tables are probably fine for you.

 

Over the past few weeks he has gotten the car to run with help from my tune. The original problem I believe was the HEI module did not like to be connected to D14. I had him switch it over to JS10 and that fixed all timing issues.