ok i have a '87 vette , tpi, maf.
what kind of eprom and memcal do i need to get? where can i find them together? seperate? cost? thanx for the help and support,...Jeremiah

 

Ok, here's what you do.

You get all the numbers off your current mem-cal (it has the eprom in it) and you go to your local Chevy dealer. You give those numbers to them along with the car's VIN and you tell them you want a mem-cal, or it is also called the Calibration. If you don't have the mem-cal, then just give them as much info about the car as you can.

Or, you go to this web site https://www.gmotors.com/request_form.asp
and fill out the request. You tell them you need the mem-cal for your car. You give them the make, model, year, vin, etc. for your car. They will email you a response within a day. They cost about $40 from them.

 

ok now do the dealers have them blank with no information on them?i need them to be blank so i can program them myself.

 

Nope, they have them programmed for your vehicle. Most eproms that are on the mem-cals can be erased with a U/V eprom eraser. Take a look at Traxion's article (https://www.thirdgen.org/newdesign/tech/promintro.shtml) for details.

 

i did look at the prom burning intro. do the eproms and the memcal have a cost difference if they are blank of programmed?

 

First of all, I have no idea whether your car uses a memcal or just takes an eprom.

If your car uses a memcal, then the memcal comes with a programmed eprom on it. I don't know where you could buy a blank memcal, unless you buy one from some individual.

If your car just takes an eprom then you can buy blank eproms from places like DigiKey or Mouser (electronics parts stores). You can find out what type of eprom your car uses by looking at the eprom, or finding the information on the web somewhere.

If your car uses a memcal, you can remove the eprom from your memcal. I de-soldering an eprom from the memcal and was successful, however, I would not recommend anyone do this on a regular basis. I found that soldering a low profile ZIF socket like suggested in Traxion's article was impossible with my memcal. I gave up trying that.

If your car uses a memcal, then here's what I would suggest you do:

First and Foremost is that you don't want to leave yourself stranded by screwing up your only memcal, you always want a working memcal, whenever possible. So, buy a new memcal from GM and run it in your car to make sure it runs okay. That's because the new memcal will probably have different programming than your original chip. The new programming will have probably fixed or improved some problems they had with the original programming.

After you're sure the new memcal works, use an adaptor like the one mentioned in Traxion's article and an eprom burner (like the pocket programmer) to download AND KEEP the original programming from your original memcal. I'll call this ProgramOLD. Then, using the eprom burner, download the program from the new memcal to your computer and KEEP a copy of this. I'll call this ProgramNEW

Then erase your original memcal's eprom using an eprom eraser, thus erasing ProgramOLD from the old memcal's eprom. Then transfer (again, using the Pocket Programmer) ProgramNEW to the eprom in your old memcal. See if your car runs with that program. That makes sure that your programmer works and is tranfering programs (using a known good program) correctly.

Once you are sure your able to transfer programs to the eprom, use TunerCat or some other bin editor to start editing a copy of the bin file you downloaded from your new memcal, ProgramNEW.

Once again use the UV eraser to erase your old memcal eprom and then transfer your edited program to the old memcal eprom.

Repeat the last two steps until you are happy with the program.

 

thanx for the info. ill try it all out
Jeremiah