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!

 

https://www.thirdgen.org/forums/diy-...d-density.html
Post 21 & 33

 

Yeah, I looked that but there's not info on what to do to make the V6 cal work or which memcal I need to use.

 

Jumper 56-62 and disable the ks.
2.8 0r 3.1L from a 730 or 727 ecm !

 

 

 

So the one marked atsn should work?

 

The atsn will work if modified the abwt will work if a new 27c256 or sst is installed no netress modification needed.just program out the ks.

 

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

 

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

 

The knock filter is not the same from a 3.1 to a 350 so no it will not work unless you use a external esc module.

 

So, how would I wire up the ESC to work with the 7730 ECM?

 

Esc wire colors
Pink black cavity b switched ign.
Yellow/Blk cavity c b8 of the 730 ecm.
Brn/ Blk red cavity d ground.
Blue cavity e knock sensor.

 

Is there a memcal that has the right ks circuit that is not an aujp that will work? And that is more common and not $300?

 

I sent you a PM about that.

 

I'm not seeing a pm from you...

 

I'll try again

 

Any 90-91 vette tpi memcal

 

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.

 

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.

 

So what is a brand new AUJP chip worth to you?

 

$50 maybe, since now I'm figuring out how to make one work without buying one.

 

I've used v6 memcal's several times, by just jumpering the cylinder select pins for use on 305 and 350 chevy's. I tried a '427 type memcal (P6 is the series I think?) they look right, but the netres is too different to work on a P4 ('730 type).
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.

 

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?

 

Any ideas on the above 3.3 memcal's guys?

 

Yes, they will work as a starting point.

RBob.

 

No jumper required, you simply cut the pin to the 15k resistor and you're done.
http://scotthansen.net/images/netres.jpg

 

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?

 

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.