JOT, is it possible to make a plug n play patch harness? Id buy one.

 

The '87 Mazda rx7 harness from field is a plug and play for 1g DSM's.

 

How do the high/low fuel and ignition maps work? Do they apply to us?

I notice the 8 ECU has an immobilizer. I'm assuming this needs to be disabled, how is this done? People don't seem to want to discuss it.

 

The high/low fuel maps apply to you yes. It is based on the octane level. The octane level is a register in the ecu memory that indicates how much the car is knocking. A lower octane level will cause the ecu to interoplate to the low maps, instead of the high.

If you look at the image of my peripheries a couple post back you will notice periphery 0 bit 3 is disabled:
https://www.evolutionm.net/forums/at...y-settings.jpg

That effectively disables the immobilizer so that you can start the car.

 

Damn, this ECU is fluffy..lean spool, alt maps, boost reduction.

I need to dumb this thing down so it is more like a 1G

 

I work slowly, but I get there eventually. I think I've found the OEM part for the 1g plugs: AMP/Tyco "Pulse Lock" connectors. P/N 172319 looks to be a dead ringer for the ECU-side PCB plug.

Not that I can find anyone actually sourcing them (DigiKey has a minimum $1k order for any of the individual plugs, Newark has a 10-week lead time, and Mouser doesn't seem to know what they are at all. ), but hey, there we go for the archives. The only place I could find listing this stuff in inventory was New United Race Tech, who I'd never heard of until about 10 minutes ago. I'm going to guess they did what Jamie did with the IX pins, and did a 1000+ piece order of each item.

 

Nice find. If my supplies of free DSM ecu's ever fails I'll pick some up. Also I was able to find the two biggest evo 8 plugs from onlinecomponets.com . I can't find the two smaller plugs however, somebody probably has them in stock.

AMP / TYCO 917981-2
AMP / TYCO 917992-6

 

Also onlinecomponets.com has plenty of evo 8 pins (big and small). Not important to this thread, but for completeness digikey has all the evo 9 plugs and pins, I bought 4 sets of plugs/pins/retainers just to have around in case they stop production.

 

WOOT! My new EVO 8 ECU is shipping today. I have my DSM male plugs ready to go. Time to start the soldering the wiring harness. I have been off the thread for a while due to the holidays. I need to catch up now.

 

And, now that I've finished ordering the bits I was looking for, I'll mention that both JAE (Evo IX pins/plugs) and Tyco (1g DSM, 2g DSM/Evo VIII pins/plugs) have excellent engineering samples programs.

 

Hahaha LOL.

 

OK, I'm trying to make the EVO-to-1G harness here tonight, and I have found a few discrepancies between the different diagrams guys have posted, and some other issues:
1) EVO pin #8, 31, 32, 24, and 45 - these are all labeled as being A/C related pins. Does anyone have an EVO 8 shop manual, that can describe how they are actually used? In a 1G the A/C operation is relatively simple: +12 volts leaves the A/C computer, goes through a high/low pressure switch under the hood, then a coolant thermoswitch which opens if the car is overheating, then back to the ECU pin #7. If the ECU sees +12 volts on this pin, and it decides everything is OK, it pulls pin #65 to ground to activate a relay that pulls in the compressor clutch. Can any of that be made functional with an EVO ECU in a 1G? Or, does one have to give up A/C to use the EVO ECU?
2) Pin #3 of the 1G ECU drives the factory boost gauge in the dash. I take it that the EVO has no such gauge? It comes in handy for other things.
3) Pin #43 on an EVO ECU: is that normally connected to a clutchswitch? I think I have picked up on the fact though that it operates the opposite of the lower starter interface switch we generally use for the NLTS and stutterbox launch with a 1G or 2G, which gets switched to GROUND everytime the clutch is the whole way out, right? How exactly does the EVO launch rev limiter function?
4) How do you check base timing with an EVO? The 1G and 2Ga cars have a terminal under the hood you ground. Has anyone written a patch to set the base timing, instead of having to use the Mitsu MUT scanner? Is that part of the Tephra mods? Ceddy wrote a patch for the 1998/99 2Gb flash ECU that added the functionality of having a terminal on pin #52 to ground, which was nice.
5) EVO pin #58: one set of diagrams shows it connected to pin #109, for a tach signal, but the other does not. As far as I know the EVO transistor provides the same type of tach pulses as a 1991-94 1G or a 2G, right? They should be compatable with everything but a 1990 car as long as the pulses are collector driven to ground.
6) Pin #87: on a 2G ECU pin #87 is the Idle Position Switch, integrated into the TPS. Does the EVO have an IPS on the throttlebody?

 

1. I have not hooked up ac.
2. Correct, evo's only use the CEL, which on tephra mods has a slow and fast blinking rate.
3. Correct pin 43 is the clutch switch. This pin grounded enables the 2 step. 12v disables the 2 step. The top clutch switch on a 1g with a 12v pullup resistor is working for me.
4. For now I've just been flashing a map with 5 degrees of timing in the cells so that I can set timing.
5. I have not connected this tach wire on my car.
6. Evo does not have an idle switch and I don't hook it up.

Also jeff, this is dan, I contacted you about the MAS plugs. Email me if you find anything out.

Edit:
Shop manual for Evo : http://carfiche.com/manuals023/cars/

We definitely could use a few code hacks/tweeks for the evo in a 1g stuff but I don't have the time or ability for now. Setting timing, possibly using an unused output to drive the knock gauge, and setting up the other unused outputs to be configurable window switches (EGR, FPR outputs). For now though it works. Make sure you start disabling the peripheries to get rid of all the check engine lights and to disable the immobilizer or the car won't start.

 

1. Looking at the schematics, it appears that the EVO A/C setup is very similar, and the EVO ECU should have no problem controlling the 1G A/C compressor. Just connect EVO ECU pin #45 to 1G pin #7, and EVO ECU pin #8 to 1G pin #65. Those 2 pins appear to have the same exact function as the 1G. The only pin I'm not sure about is EVO ECU pin #24, which is supposed to get a direct connection from the EVO A/C computer. I don't know whether that signal should be ground, +12 volts, or if it can be left unconnected and still work fine. I guess we'll find out.
5. Looking at the EVO ignition system, I don't see where it has any tach output anywhere, other than pin #58 of the ECU, which I think is just a testpoint for technicians to clip on to to read the rpm's. The 1G only uses the tach signal to check for misfires anyway, so the EVO ECU must use a different system, like the P030X Random Misfire stuff perhaps. So, I would just suggest leaving pin #58 unconnected, as you have.
6. No IPS on the schematic, as you said.
I removed a connector from an old 3G MAS if you want it. Just email me your address. I haven't heard back yet from my Mitsu friend.
Thanks!

 

My '90 has a MSD DIS2 ignition box that requires a special tach adapter. Will pin #58 allow me to ditch the tach adapter and use 58 to drive the tach?

Where would I tie it in?