I am just about to break into the prom burning. I have an old chip out of my 87 vette which was a MAF car. I was wondering if I could use this chip on my 91Z28 speed density car? Once I have erased the prom and changed parameters. Anyway, the chip number onthe side is 68767 8647. I'm not sure if the limp home side of the chip is for the maf or not. It probaly is but I thought I would ask.

 

Totally incompatible...the MEMCALs are different, PROMs are different, software is different.

MAF uses a MEMCAL with resistor packs, SD has this plus the ESC module on board.

MAF uses 128KB PROMs, SD uses 256KB.

MAF software looks for input from a MAF sensor, SD looks for input from a MAP sensor plus the knock sensor circuit's net resistance is different.

 

I agree with Kevin, the Memcals frm SD and MAF cars are completely incompatible. Even the Memcals from a 3.1 V6 SD car and a 5.7 V8 SD car are different.

The only thing "similar" with a MAF setup and SD setup, is you can use the AT29C256 Flash Prom on both (when properly "offset") - other than that, nothing matches.

 

Thanks you guys! I have one more question. I plan to make the 28 pin addapter for the memcal to the chip/programmer. If I use this method, I will not need to solder chips in and out of my memcal, correct? And if so, how much is it for a stock chip/memcal so I can have 2 for the sake of convenence? I plan to use my old corvette chip to pull the data and experiment..but not to use in my car! Thanks again!!!

 

You might want to check my website, I can get you an adapter which will let you do what you want with respect to swapping EPROMs.

http://ice.prohosting.com/moates/gmecm/

I just ordered parts enough for at least 20 more units, probably another 20 after that.

-Craig

 

Craig,

How much? send me a PM.

Craig.

Also, by using the 28pin addapter, will I be able to pull the entire chip and memcal, program it and then just put it back into the emc?

 

Well, what it does is let you roll your original Memcal (with original EPROM intact) on its side and then drop a 29C256 or EPROM into the top of the adapter. Then you just work the lever to swap chips as you change the program on the chip(s).

The original Memcal stays in the ECM untouched, where the leads to the 'non-eprom' part of the Memcal are routed to the original locations at the ECM header. Best of both worlds I guess. Hope this makes sense.

 

Thanks Craig:hail: