There's a lot more people here interested in performance than there used to be. Just in case you'd like to do your own PCM programming work, this company has the ticket!
http://www.carputing.com/
Hey Sal, have you tried to get them as a vendor here?

to my understanding, i should be able to re-program my 4.9 liter ecm with the right soft/hardware. i have looked at the items needed for such re-programming on the fiero sites. the only reason i am going to do this myself is for the fact that i will be adding a turbo to a 4.9 liter while still in a cadillac. having someone else do it for me would be far too expensive, and i could test the limits of what i could do with my obd-1 ecm setup.

I sent them an email regarding the northstar and they said that they had no plans what so ever to program software for that engine. Right now they are working on the LS2 in the new corvette. If you have a Fleetwood with the LT1 than your in luck. They specialize in that engine.

danbuc, your N* is an OBD-2, right? that is probably why there are no plans to make software for that particular engine, although im not too sure about the OBD-1 N* either.

i do know the fiero guys hack away at the 4.9 engine controll system, but have not yet read anything about them hacking the N*.

The new LS2 engine is OBDII as well as the LS6 in the C5 and the CTS-V. They could do it if they wanted, but there is just no a big enough market for reprogramming software for the N*. Thats why they won't do it. Pretty much all cars made now use OBDII, both domestic and imports.

http://fieroaddiction.com/EPROM.html

this link should go to some of the software companies the fiero guys use for various ecm's. from what i gather, it is not too terribly expensive, considering the amount of tweaking i will have to do in my case, you know, that thing with the turbo setup.

On my site www.speedyoldtruck.com I have information on how to reprogram the 7747 OBD-1 ecm found in 87-93 GM trucks but the information applies to all GM ECM's that use removeable EEPROM.

Another site to check out is craig moates www.moates.net, he sells flash chips and flash adapters and the autoprom emulator/programmer/reader for pretty reasonable prices, another good site is gmecm and diy-efi, at www.diy-efi.org

Once I get ahold of an OBD-1 ecm for the '94 northstar I'm rebuilding, I'm going to take a good look at the values set in the eeprom, and post my results on my website...if anyones got a 93-94 OBD chip or ecm for cheap, let me know i'd be very interested in it. But honestly, I don't expect that there's gonna be a huge amount of difference in the way that the values are assigned in eeprom between the cadillac northstar and any other gm vehicle (the buick gn guys are pretty far ahead at this, and have disassembled code for every ecm ever put in a gn/t-type). Of course this is speculation, but eventually I'm going to figure out these issues because I'm rebuilding my northstar to put in a different vehicle than the one it came from and couple it to a manual tranny.

illumina....

I thought the stock caddy 4.x ECM wasnt able to scale the injector pulses with MAP over 1 bar or something, and thats why PJ from pennocks fiero forum used a modified typhoon/cyclone/turbo sunbird ECM...

I was thinking a piggyback megasquirt would be the best/cheapest to control some extra injectors before the throttle body

by the by I read somewhere, maybe diy-efi that the cheapest way to burn/read a prom cheap is with an old computer with a floppy drive and a burnable bios/prom

Are you any further along with your turbo project? Still going to use that small turbo? Whats the compressor A/R on that thing? Id watch your intake temperatures using something like that...

Good luck,
Brian