I was looking a the series of numbers and letters on a silver sticker on the top of the prom and was wondering if I could tell was year model it is for. Or does it mean anything? I bought the chip from GM 2 years ago but do not remember what it fits. I know it is for a 3rd gen tpi but don't know what year, size motor, or what? The numbers go like this(just example, not actual numbers)

xxxx - 4 letters
1111 - 4 numbers
1111 - i think there is more numbers here

I know I could just put it in the programer a read the bin, but I haven't bought mine yet. Anyone know what it is?

Mark
91gta
86c10

Post them and we can tell you. But we need to see them first.

Well if it is just a bare Prom chip and not a calpack and truely is for a 3rd gen TPI, then it is for an 85 TPI 305F, as that was the only year they used a bare prom without a calpack attatched and only 305's were avialable for the Camaro/Firebird.

It is not a 85 version, as it has the limp mode chip, knock chip, and another on the memcal.

the numbers are

AXXF
1616
3075

those are the numbers on the prom.

Mark
91GTA:hail:

Do you EVER READ what the people are saying? Again, the guy says he's got an 91 F-body and you are talkiing about 85 TPI cars. What does an 85 MAF car have to do with a 1991 SD car?

Stop confusing people with irrelevant information. This is the second time you've done this.

It's for a 1991 F-body 305 Auto car. But it will work for a 1990 and 1992 also.

Do YOU have a problem with EVERYONE here or just a select few of us? you seem to have a real bug up your butt.

NO WHERE did he state that the Prom was for HIS car. in fact to directly quote him

"I bought the chip from GM 2 years ago but do not remember what it fits. I know it is for a 3rd gen tpi but don't know what year, size motor, or what?"

Maybe YOU should read a little more and not be so quick to jump on others, failing that maybe just say nothing.

You do know that all 85 TPI ECMs (870s) only used a 3 letter BCC while he's clearly saying it has a 4 letter BCC (Memcal) and therefore could never be a 1985 ECM.

And I stand by this quote. Take my last bit of advice...and welcome to the ignore list, my first patron.

No problem, stop giving incorrect information and you'll never hear from me.

I didn't mean to start a fight, guys.

Where did you guys find out what it fits? I would like to find a list of these numbers and what they fit for reference. Thanks again for your help:hail:

mark
91gta

What would I have to change when burning the prom, to make it work on a 350? The injector size? VE tables? I am sure there is more but I don't know. It will be for a auto 350 SD7730.

Mark
91gta

It wouldn't be that hard to convert to a 350 - match the injector size to what you are running on the car and change the Cylinder Volume Constant. FYI, 305 19#s with a bit higher fuel pressure will work just fine on a basically stock L98.

But, why do all this work? Just get the AUJP Bin from www.diy-efi.org - it's designed for all L98 F-body cars (they are all autos). The spark tables will be a little bit more aggressive too (but you can still improve), since the AUJP is designed for 3.23 rear gears (instead of the 2.73s that the 305 auto uses).