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Compound1g

Proven Member
58
1
Feb 10, 2019
Qualicum beach, BC_Canada
1g 1993 AWD 7 bolt
550cc injectors
268/272 cams
8.5:1 Cr
Forged internals
Water meth kit
Speed density, gm 3bar and iat
Aem wideband
Compound turbo setup 14b/16g
Trying to tune for 20psi (I'd do waaay more, but these injectors just can't do more than 20)

I bought an aem ems (30-1300) used locally for cheaper than I could find ecmlink for, however, being that I've never tuned before, I'm a bit inexperienced at this.
The old ecu had a aftermarket chip tuned to work with the old setup, seemed to be a good tune, would hit 10:1 Afr under all Boost levels till the injectors ran out, and would stay right at 14.7:1 in all vacuum levels, but timing was too agressive, and it would knock a bit at high rpms. Ideally I want to get to the same point with the aem ecu, but I don't know what the old ecu had so I can't copy it over to the aem.

I've input all the sensors, set the map sensor voltage as load (only way I could get any load to register), I can get it to idle, but if I try and accelerate, the afr goes all over the place, does anyone have a tune for speed density I could use a base to tune from? Or even just some pics of fuel tables, and boost compensation graph, and maybe timing table?

At this point, it takes like 30 seconds of cranking just to start it, idles ok but can't do anything else.

Would also consider trading for ecmlink
 
Did you connect the wideband 5V output to the ECU and set the injector battery offset, the base timing, and all sensors by yourself? If not, you are still using the previous owner's setup and maps. So you have to do that first.
 
Did you connect the wideband 5V output to the ECU and set the injector battery offset, the base timing, and all sensors by yourself? If not, you are still using the previous owner's setup and maps. So you have to do that first.

Wideband is connected and working,
Base timing and injector battery offset are the only things I didn't change since I didn't know what to change them to, as for timing, I haven't even gotten past fuel at idle

I input all my sensors and they seem to be responding correctly, but I can only get engine load to work if I set it to use "map voltage" rather than "map as load" I would think that map as load would be the better, but voltage seems to work
 
Wideband is connected and working,
Base timing and injector battery offset are the only things I didn't change since I didn't know what to change them to, as for timing, I haven't even gotten past fuel at idle

I input all my sensors and they seem to be responding correctly, but I can only get engine load to work if I set it to use "map voltage" rather than "map as load" I would think that map as load would be the better, but voltage seems to work
You are using AEMPro, correct?

I don't remember very well about AEMPro I used it long time ago for very short term, I am speaking with referencing AEMPro that I still have in my laptop. so something could be wrong. I am sure somebody still use it and would chime in here.

To set base timing :
Go Configure -> ECU Setup -> Set Ignition
For instance, Set a timing light as it should and warm up the engine. If you want to set the base timing at 5BTDC, put "5" then click "Set Fixed Timing". Then go under the hood and check with the mark on crank pulley with a timing light. If the timing mark is advanced then click "retard" until the mark on crank pulley gets 5BTDC.

To set injector battery offset :
Go View -> Wizard -> Primary Inj Batt Offset
Then if you see the injectors that you use is listed then just select it.

If the injectors that you use is not listed :
Go Fuel -> Advanced Fuel -> Fuel Trims -> Fuel Trims
Then many windows will open, find "Batt Offset Primary Table" then set the battery offset manually.
 
Last edited:
Ok, I've made some good progress, I used a combination of the base tune for a 1g, 2g, and Evo 8 from the base tunes in aemtuner, and then adjusted things till it started fast and reliably with a good idle.

then I shut it down to do some tweaking and to read the log and it wouldn't restart, i could almost swear I heard a popping sound, like a fuse blowing, I can smell gas and hear the fuel pump so it's not fuel related, I hooked up a timing light and it wasn't showing any spark, so I swapped in the stock ecu, same thing, swapped out the transistor pack and coil, still nothing, tested the cas, seems to be working stil, the damn thing just won't spark, according to the logs, it thinks it's starting and tries to idle at like 100 rpm, but obviously it's not registering any spark so it just kinda doesnt do anything

What are the common causes of no spark?
 
You may have messed up the ignition setup. Calibration files from AEM are not base tune file. Those are just to start up the engine.

Try this and see if the engine starts.

Go View -> Wizard -> Coil Dwell Wizard
And select "Mitsubishi Coil"

Go View -> Wizard -> Cam/Crank Sensor Wizard
And select "Mitsubishi DSM (90-94 Turbo)"

As for you mention the stock ECU. The stock ECU doesn't work with SD setup and the wideband connected instead of the stock O2 sensor. If you would like to try the stock ECU, then you have to disconnect the MAP/IAT sensor and install the MAF sensor and the stock O2 sensor.
 
You may have messed up the ignition setup. Calibration files from AEM are not base tune file. Those are just to start up the engine.

Try this and see if the engine starts.

Go View -> Wizard -> Coil Dwell Wizard
And select "Mitsubishi Coil"

Go View -> Wizard -> Cam/Crank Sensor Wizard
And select "Mitsubishi DSM (90-94 Turbo)"

As for you mention the stock ECU. The stock ECU doesn't work with SD setup and the wideband connected instead of the stock O2 sensor. If you would like to try the stock ECU, then you have to disconnect the MAP/IAT sensor and install the MAF sensor and the stock O2 sensor.

Already have the correct coil dwell and cas setup in the tune, well, according to the wizard it's correct atleast

It was a stock ignition map from aemtuner for a 1g DSM, I compared it to ones id found online that others had made for ecmlink, and edited them a bit, I followed instructional videos I found online and I'm fairly confident I can get it tuned half decently, I'll upload the logs and tune, it would be nice to have someone check it over and see if I made and glaring mistakes

I had a good idle, let it warm up and it reved free and decent, but laptop was about to die So I shut it all down and went in for a bit, came back out and started it back up, it ran like crap for a few seconds then died, wouldn't restart

The old ecu had been chipped to run a speed density setup, it worked great but the timing was too agressive so I installed the aem ems to tune it.
To test it with the old ecu,I reverted the wiring back to the way it was and it still wouldn't spark
 
Ok, did some testing, turns out I AM getting spark, the plugs just got cooked from all the fuel from the cold starts and cranking I guess, threw some new plugs in, and swapped back to the aem, fired right up but was maxing out the wideband, I'll switch around the cold start maps and see what happens
 
Ok, Still having issues, could someone take a look at my tune and tell me whats wrong? it doesn't like starting, and dies immediately after startup unless I hold the pedal, then the afrs are all over the map, cant seem to get the fuel tables dialed.
At this point I cant even get it to idle, let alone drive
drivehttps://www.dropbox.com/s/sszvbhrizutehue/1g tune.gdf?dl=0
 
Already have the correct coil dwell and cas setup in the tune, well, according to the wizard it's correct atleast

It was a stock ignition map from aemtuner for a 1g DSM, I compared it to ones id found online that others had made for ecmlink, and edited them a bit, I followed instructional videos I found online and I'm fairly confident I can get it tuned half decently, I'll upload the logs and tune, it would be nice to have someone check it over and see if I made and glaring mistakes

I had a good idle, let it warm up and it reved free and decent, but laptop was about to die So I shut it all down and went in for a bit, came back out and started it back up, it ran like crap for a few seconds then died, wouldn't restart

The old ecu had been chipped to run a speed density setup, it worked great but the timing was too agressive so I installed the aem ems to tune it.
To test it with the old ecu,I reverted the wiring back to the way it was and it still wouldn't spark
Can I run the stock CAS sensor? black top for reading RPM?
 
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