Chip question
 

I am trying to figure out what this guy has in his car. It is a chipped EPROM. I removed the cover and it says: Mitsubishi Performance Specialists STG3

So far all I now is that it has a shift light set a 7k and selectable gauges. Now I know it should have a studderbox, but I hooked up the clutch switch wire and nothing. I have even tried it the TMO method by pressing in the clutch and tapping the pedal. But there is still no studderbox. Also, is there anyway to figure out what it is set for in terms of MAF/Injectors size, etc. It was installed by Excessive in Sioux Falls, but do to recent events....we are not exactly on good terms. And i'm not sure if they will remember anyways. Reciepts don't show anything about it either.

Maybe I should just buy a chips from www.dsmchips.com and that way i'll know what he has.

Wiz

Re: Chip question
 

Is it Mitsubishi Specialities? If so I believe thats the company who bought the rights to TMO chips.IIRC they don't do MAF or INJ comp, only stutter, gauges, and fuel cut, etc.

Re: Chip question
 

Did you use diodes on the clutch wire?
BTW I can do anything Keydiver can, and I'm much cheaper.

Re: Chip question
 

This is good info for me, i'll be looking to buy a chip in the next couple of months.

Re: Chip question
 

Im pretty sure mspec isn't the company that purchased the rites to the tmo stuff.

Re: Chip question
 

The owner claims he did.A year or two back I was selling Eprom ECUs with custom chips on EBAY.Mitsubishi Specialities filed a claim to EBAY claiming they owned the rights to the TMO code.Anyway EBAY banned me from selling chips, IIRC this same place/guy did the same to keydiver making him unable to sell chips on EBAY as well.

I went way out of my way to make my eproms different from everyone elses, and this fucker still did this shit.It was an attempt to eliminate his competition, and perjury.

Re: Chip question
 

Actually maybe its DSM Specialities I'm thinking of? Its an EBAY only company

Re: Chip question
 

I'm pretty sure you are right with that one. I remember looking around a few years ago and seeing a lot from DSM Specialties, and using direct reference to the TMO code.

Re: Chip question
 

No I didn't use a diode in the clutch wire, but the diode is only to prevent you from starting the car without the clutch engaged.

But I am just going to get a new chip burned that way I know what we have from the start. Because as of right now, I don't know what it is set for (MAF, injectors, etc.) Not a good place to start IMO.

Wiz

Re: Chip question
 

Not true at all.Without the diodes(two), the clutch input to the ECU will not work.You either have to eliminate the starter circuit from the clutch switch, or use diodes to isolate the starter circuit from the clutch input into the ECU.

Re: Chip question
 

The park-neutral input(clutch input) into the ECU is a high impedance input with an internal pullup resistor to power, meaning it rests at a logic 1(on) and it takes very little current to switch from 1 to 0 or vice versa.When the clutch switch is activated(clutch depressed) it grounds(logic 0) its signal output.Without the diodes, even when the clutch is pressed, and it grounds its signal wire, there will still be a logic 1 at the ECU input due to power through the starter relay coil.So essentially the 12v power applied to one side of the relays' coil, drowns out the ground signal from the clutch switch.If you take a high impedance test light and probe your added clutch wire, you'll see exactly what I'm talking about.

Re: Chip question
 

Well, anyone have any part numbers for me then? This ECU was installed by a certain shop and they never hooked up the clutch switch. So I have no diode-equipped clutch wire. Or would just any 12-14v diode work as long as it's hooked up correctly? Better yet, how about a wiring schematic? I have the factory manuals, BTW.

Thanks,

Wiz

Re: Chip question
 

You need 2 1N4001.They're very common and should be easy to find.There's a silver band on one end.Connect the 2 banded ends to the clutch switch, the other ends go 1 to the ECU and 1 to the starter circuit

Re: Chip question
 

Cool....thanks. Another thing......who's got a 1g ECU that works? Turbo of course. Found out that one of my projects has a dying ECU. Only thing I got is a 2g Turbo w/harness and 92 NT ECU. I know the NT will run the car but at a lower performance level. The 2g will work great once you get the 100+ wires soldered together. Really just looking for a good 1g 91-94 (don't feel like switching any wires) Turbo ECU.

Thanks,

Wiz

Re: Chip question
 

If you can't find the diodes, I have over a thousand of them, they're only a few pennies a piece so I could drop a couple in the mail.

I would just try to find an ECU in a local junkyard, if that doesn't work out I have like 12-13 of them

Re: Chip question
 

Local J-yard in Aberdeen? There are only 2 (Yes only 2) DSMs in the j-yards here. One is a wrecked 2.0L NT (1990) that we just bought for a bottle of whiskey and a 1.8L NT that was also wrecked. That's it.

We are running the NT ECU for now until we find one. Thanks.

Wiz

Re: Chip question
 

You could also transplant a few parts from the dying ECU into the NT ECU to make it a turbo ECU. Knock board, flyback caps, etc.Very easy if you're familiar with that kind of stuff.

Re: Chip question
 

Not worth the trouble to mess with it. Especially when a good turbo ECU was found locally for next to nothing.....will be upgrading the caps before anything goes bad on this one.

Wiz