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Old 10-13-2011, 05:54 PM
JeepsAndGuns's Avatar
JeepsAndGuns JeepsAndGuns is offline
AMC 4 OH! 1
 
Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,571
No need to do a writeup, theres plenty of info out there already. I am just posting up about it so those who dont go to other sires will know about this swap.
Heres some good info:

http://www.binderplanet.com/forums/s...d.php?t=103053

Heres a good wiring diagram showing what pin to hook where, when you remove the old 7747 plugs and put the pins in the 7427 plugs. I just printed out that first picture

http://www.gearhead-efi.com/Fuel-Inj...light=16197427

Here is another good thread with some more info about the 16197427 pcm, along with wiring diagrams, tunerpro defination files, and bin files.

http://www.gearhead-efi.com/Fuel-Inj...Information-OD

As for the chips. Yes, you can use the same 27SF512 EEPROM chips that you would use with the 7747. No need to soder in jumper wires to make the chip work like you do with the 7747. The 7427 is already a 28 pin chip.
The 16197427 uses what they call a "memcal" unit. You have a few options. You can do like I did and buy the moates G1 adapter (easyest way to do it, no sodering required) I bought this package with the zif and chips.
http://www.moates.net/gp1-package-gm....html?cPath=64

Or if you already have chips and a zif socket, you can get it by itself.
http://www.moates.net/g1-memory-adap....html?cPath=64

Another option would be to cut off the old chip from the memcal unit and soder in place either a 27sf512 eeprom, or a dip socket, as outlined here:

http://www.gearhead-efi.com/Fuel-Inj...r-27SF512-Chip

If you simply soder in a eeprom into the memcal, then you will need this little jewl to program it:
http://www.moates.net/hdr1-memcal-he....html?cPath=64

I have one and find it rather handy, as it allows you to read the bins from the stock chip in the memcals.

And, the whole site put up by eagle mark is a great forum for fuel injection addicts such as myself. Lots of good info, you can spend lots of time looking, searching and reading.

http://www.gearhead-efi.com/Fuel-Injection/forum.php
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.

Last edited by JeepsAndGuns : 01-13-2012 at 06:26 PM.
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