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Old 10-12-2011, 06:02 PM
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JeepsAndGuns JeepsAndGuns is offline
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16197427 PCM swap

I just swapped my old 1227747 ecm for a newer 16197427 pcm after reading about it on binderplanet. I must say, wow, there is quite a diffrence!
My idle is smoother and better. The engine sounds smoother and better, accel is better and smoother, steady cruise is smoother and better, heavy and wot accel is better and stronger, even decel is better and stronger.
Pretty much under all conditions my engine runs better, smoother, and the "butt" dyno even feels like I picked up a couple more ponies. All I did was input my timing table from my old 7747 tune into the new bin file and did a little smoothing of the fuel maps and went for a spin. I am on my 5th data log and have almost got my fuel maps where they need to be.
The pcm splits up the fuel into two diffrent maps, one for near ilde, one for off idle, same thing with spark tables. There is a idle and off idle table. Also if using with a manual trans or non computer controlled auto, there are also a few changes you need to make to turn off the auto trans controlls. I also turned off all the trans error codes and turned off the egr.

The 7427 pcm is found in most 94-95 trucks and vans with the automatics. They were used with the 4L60E, and 4L80E electronicly shifted transmissions. There is also about 4 times as much code in the computer as the old 7747, so theres a little more to learn. But I would reccomend anyone with a 7747 system looking for the next step, to look at swapping in this one. You can re use your current harness, just remove the pins from the old 7747 connectors, and put them in the 7427 connectors.

Another nice thing about this computer, is it can run multi port (batch fire) with just a small mod to the ecm and a little tweaking to the programming.
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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.
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Old 10-12-2011, 06:48 PM
FSJ Guy FSJ Guy is offline
 
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What's that? Oh, did I hear you say you were going to do a writeup for us?!
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1987 Grand Wagoneer, slightly longer than stock.

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Old 10-12-2011, 06:48 PM
FSJ Guy FSJ Guy is offline
 
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Does it give a better (faster) datastream than the '7747 ECM?
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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Old 10-12-2011, 10:22 PM
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Revhendo Revhendo is offline
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Crap, what? I don't even have my 7747 system up and running yet and there's something better? Of course there is. Does this use the same chip burner and whatnot?
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Old 10-12-2011, 10:46 PM
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  #6  
Old 10-13-2011, 05:54 PM
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JeepsAndGuns JeepsAndGuns is offline
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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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Old 10-30-2011, 07:43 PM
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babywag babywag is offline
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Quote:
Originally Posted by FSJ Guy
Does it give a better (faster) datastream than the '7747 ECM?

A quick check online returned 8192 baud vs. 160 is this true?

I just picked one up @ the yard today, was the only one left in the truck.
Luckily the chip was laying on the floor.
For whatever reason the only pull it yourself yard around me you rarely find a computer, and 99% time if you do someone has robbed the chip from it.

JeepsAndGuns, are you using this on a 360 or a 401?

The one I found was a 16197427 BJYL pretty sure the truck was a v8?
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Old 10-30-2011, 08:36 PM
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JeepsAndGuns JeepsAndGuns is offline
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Using it on the 401 in my signature.
The datastream rate (as far as I can remember) is correct. I dont know the exact number, but its instant, no lag that I can see at all when datalogging.
The BCC on that chip is a V8 one, so you done good.
But why would someone go through the trouble of removing the pcm, then the memcal, only to leave the pcm in there, and the memcal on the floor?
Makes me wonder if they might not have had a bad memcal in their pocket, then swapped them out in the truck. Hopefully this is not the case.

I am still loving this pcm and am just starting to scratch the surface of what it can do. I like having two timing tables, and am starting to play with the idle one. (to start with, you just make them both the same)
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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.
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Old 10-31-2011, 01:38 AM
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Quote:
Originally Posted by JeepsAndGuns

But why would someone go through the trouble of removing the pcm, then the memcal, only to leave the pcm in there, and the memcal on the floor?
Makes me wonder if they might not have had a bad memcal in their pocket, then swapped them out in the truck. Hopefully this is not the case.

Now you've got me wondering...
memcal cover says BJYL 16200098
Sticker on pcm says 16200345 BJYL
Should the 16200xxx numbers match?
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