90-92 SD EEPROM
#1
90-92 SD EEPROM
Hello everyone. I have a question that I hope someone can help me with. As most of you know, the AUJP factory chips are super expensive, but the EEPROM's are dirt cheap. I can find the AUJP code base of course, and I keep reading that I still need the factory chip for the limp mode circuits. Is there a way around this? I have a complete TPI system (except the chip) and would like to swap this into my car. I've already got a harness and the 7730 ECM. Any thoughts on this, or links to info? I've looked through a lot of info and have seen some snipets about V6 chips working with a mod, but can't actually find the mod. Thanks!
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#9
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iTrader: (92)
Re: 90-92 SD EEPROM
An external esc from a tpi maf and 100 ohm ks can be used if the signal ks sent to pin b8 of the 1227730 ecm.
http://www.exatorq.com/ludis_obd1/triplugecm.html
http://www.exatorq.com/ludis_obd1/triplugecm.html
Last edited by Tuned Performance; 03-23-2017 at 07:16 PM.
#10
Re: 90-92 SD EEPROM
So, as long as I do the jumper on that ATSN like you showed above, and then flashed a new EEPROM with the aujp code, it should work fine in a 350 TPI setup? If I use the correct ks, that will work too though, correct?
16060954
16060956 1989-90 3.1-T PFI (LH0) 1227727 ARCX, ARZW, ATSN, ATSP
16060954
16060956 1989-90 3.1-T PFI (LH0) 1227727 ARCX, ARZW, ATSN, ATSP
Last edited by fish2222; 03-23-2017 at 08:53 PM.
#19
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Join Date: Jul 2004
Location: Salem,Oregon.
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: 90-92 SD EEPROM
I am fairly sure the knock filter on the pickup truck and van computer memcal will work. the netres is wrong,so you cant use the whole memcal ,but I think you should be able to transplant the knock filter.
just find a 93-95 pickup with a TBI 350 and the red/blue plug computer like the '427 or one of the other compatible computers and pull the memcal, extract the knock filter, then transplant it to your memcal. right now these are VERY common at the pick-n-pull yards, TPI ecu's OTOH are a lot harder to find.
just find a 93-95 pickup with a TBI 350 and the red/blue plug computer like the '427 or one of the other compatible computers and pull the memcal, extract the knock filter, then transplant it to your memcal. right now these are VERY common at the pick-n-pull yards, TPI ecu's OTOH are a lot harder to find.
#20
Re: 90-92 SD EEPROM
I have 3 of the 7730 ECM's already, so I am not worried about that. I had this setup running at one point, but borrowed an AUJP chip to make it work. I had to give it back, so I swapped back to carb, but really want to go back.
#23
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: 90-92 SD EEPROM
$50 maybe, since now I'm figuring out how to make one work without buying one.
Next time I run a 730, 727 or 749 I'll probably still use a jumpered V6 memcal but I will try transplanting the knock filter from a '427 type pickup PCM.
The reason I believe they are compatible is because I just soldered one onto an EBL-P4 which is in a '730 and I used a 454 filter board from a '427type PCM. Works fine.
The only thing you'll give up over an original TPI memcal is the limp home calibration, which sucks to begin with anyhow.
#24
Re: 90-92 SD EEPROM
So, I picked up two 1228706 3.3L ECM's today for the low price of nothing. They look identical to the 7730 ECM too. They came with these two PROM's. Even though they were 3.3L units, they should still work, as long as I do the V6-V8 jumper thing, correct?
Last edited by fish2222; 03-28-2017 at 08:32 PM.
#27
Re: 90-92 SD EEPROM
No jumper required, you simply cut the pin to the 15k resistor and you're done.
http://scotthansen.net/images/netres.jpg
http://scotthansen.net/images/netres.jpg
#28
Re: 90-92 SD EEPROM
OK, so this will make the factory knock sensor work with a SD setup and not need a factory knock board, correct? If this is the case, why are so many people trying to figure out how to reverse engineer the knock boards?
#29
Re: 90-92 SD EEPROM
So, anybody know the answer to my question above?
Also, I was super happy for a short time today. I found a 91 Camaro RS in a yard today that still had the ECM in it. So I pulled it and took it home. Found out it had an AUJW memcal. Drats, thought I got a good deal! I thought all of the RS cars were V8! At least I have can add another good ECM to my pile now.
Also, I was super happy for a short time today. I found a 91 Camaro RS in a yard today that still had the ECM in it. So I pulled it and took it home. Found out it had an AUJW memcal. Drats, thought I got a good deal! I thought all of the RS cars were V8! At least I have can add another good ECM to my pile now.