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ECU ROM, will it fit?

Old 04-10-2003, 09:36 PM
  #1  
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Default ECU ROM, will it fit?

Okay, I finally pulled out the ecu from my Dohc ZC rex, and I found out it was an HF ecu (PM8, I thought it was a DX ecu, either way ran like crap). Okay well my question is:
I ran into a site that said the ROMS from a PM6 WILL work on a PM8 (and PR4 and PG7 and other Multi inject ecu's). Well when I found out the ecu was a HF i was like crap what a useless ecu. Until I ran into this site, so my question is, is it true that a PM6 rom will work in a PM8? Because my idea is, if this does work, I want to get one of those "Mugen" or should I say "Mugan :P)" and put it into the PM8.

Anyone know if this is true? That the PM6 rom will fit into the PM8?

I'll look for the site that has it. Sorry If I posted in the wrong category, this does qualify for engine management right?
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Old 04-11-2003, 03:40 AM
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Default Re:ECU ROM, will it fit?

1) PG7 is suspected not to work. I think the 88-89 PG7 is a funky hardware platform. If anyone has one, post up a pic of the motherboard and I can tell you.

2) PM8 will run a PM6 program, yeah. BUT. There's no place to stick a chip on it. You have to desolder the 40 pin OKI 83C154D chip and fit a daughter board (that you have to construct yourself) in it's place to hold the 83C154D, a 74HC373, and your chip. It's not hard, but I don't think you're comfortable anough with ECUs, electronics, and hardware to attempt it just yet.

I think you need 90-91 PM6 or PR4. Anything else 88-89 MPFI is the same as the 88-91 PM8 aka difficult to "chip"
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Old 04-13-2003, 04:52 AM
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Default Re:ECU ROM, will it fit?

Hmmm the soldering... I think I could handle that. I've modded a few PSX and rigged them bright *** led lights on them little nokia cell phones. The only thing I am worried about is the "daughter board (that you have to construct yourself)". Not much of the creator type. But I do have some pics of the PG7 if you want them. I took em last night, opened it up and snapped some shots. I also took some pics of the PM8 board. I hope the pics are good enough. I'll have to figure out how to post them first, since i know that you guys say geocities sucks for this stuff. Try to post it later on, it's 3 in the morning, I wanna sleep.
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Old 04-13-2003, 09:32 PM
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Default Re:ECU ROM, will it fit?



Chipping ROMless OBD0 ECUs

Please post up those pictures of the PG7, I have conflicting reports of what the 88-89 PG7 hardware actually is (8051 or 83C154D MCU). Email them if you'd like, I can throw them up on my webspace.

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Old 04-14-2003, 01:00 AM
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Default Re:ECU ROM, will it fit?

....whoa.... where did that mini board come from? Did you make that yourself? Don't know if I can make one of them but I could try, unless some spot sell em .

As for the pics of the PG7, hehehe I was ready to e-mail em to you, pulled the disk outta the digi cam, but then I realized that my laptop doesn't have a flopy drive. Dang new laptops, they now have Dvd/CD-RW's but they can't make room for a floppy drive, but my laptop's sexy. Well I'll probably e-mail you the pics of the board later tonite, I might even take some more pics for you, like some close up or somethin.
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Old 04-14-2003, 02:05 AM
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Default Re:ECU ROM, will it fit?

Click the link below the picture - that board is a design by Doc from PGMFI. I think he's the only one making them, but I have the means to (ghetto computerized PCB drawing station almost ready to be tested w00t).

I *think* this might not even matter... if I'm not mistaken someone posted an a5h-less PM6 program to PGMFI today. Now all you need is a 40-pin socket for your ECU, and an adapter to burn a 40-pin chip in a chip burner. The Amtel 89C55's you'd use run ~$2 a pop, not too bad.
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Old 04-15-2003, 10:14 AM
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Default Re:ECU ROM, will it fit?

for real?
Don't need a 28 pin rom?
Just pop out the 40 pin MCU? and put in a Atmel 89c55 or compatible?
hmmm
damnn...I'll wait on doing that..have to pay some bills first.
I'll go on boosting my car with the FTB first. i have vacume advance, so no biggie going to put some check valves on my vacume advance lines to keep it from advancing to much when in boost.
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Old 04-15-2003, 10:21 AM
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Default Re:ECU ROM, will it fit?

Can't seem to find it.
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Old 04-16-2003, 03:48 PM
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Default Re:ECU ROM, will it fit?

Hey Joesph Davis, I e-mailed you the pics of the PG7 board the other day, but I got a "Delivery Status Notification: Failure" bsaically saying that the delivery wasn't sent. I e-mailed them to [email protected]. Is this account valid or do you have another account?
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Old 04-17-2003, 12:06 AM
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Default Re:ECU ROM, will it fit?

That account is valid, and I've gotten attachments in the 6-7 Mbyte range before so I don't think it's attachment size related.

Try again, if it doesn't work PM me and we can try AIM/IRC/etc.
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