1227747 to 16197427 Conversion Box!

[d0nk3y]

No, dont make that adapter, its a royal pain in the butt to make. Trust me, I made one. Once you plug the 7427 in and run it, you wont want to go back to the 7747. I made that adapter, plugged it in and took a test drive. I never plugged the 7747 back in. I removed the adapter and removed the pins from the 7747 connectors and put them in the 7427 connectors and never looked back. Took probably 4 times as long to make the adapter than it did to re pin the connectors.

I'm going to use the 7427 for my own projects.
I'm just going to make the adapter to get faster data acquisition in vehicles setup with 7747 ecus. Seems I know lots of people with modified TBI engines that don't quite run right. When I go trash-pickin at the local JY, I don't want to have to always be on the lookout for a 7427 for a "Buddy", lol! I'm having a helluva time tuning this latest truck; it's a "mystery" 350 with a huge cam and a stock stall speed converter. Guy bought it from someone else and got tired of it flooding out on hills (offroading), so he paid $$$ for a TBI harness and put a TBI and manifold on it then wondered why it wouldn't run. That dang 747 gives me a lil bit of data every 1.2 seconds, whether I need it or not ;) and it's just not fast enough to catch the transients.

Anywhoo, I liberated connectors from a 747 box today and I'm just siting down to make up my excel sheet for listing the circuits & location for each ECU. After that, just some swapping of wires, lol.

[dave w]

Try using the attached Excel spreadsheet for fixing VE tables. The spreadsheet includes the older '7747 and the newer TBI PCM with $OE, $E6, $OD, $31. Copy / Paste the running averages from the TunerPro RT BLM History Tables. Compared to other VE Fixers, the attached spreadsheet is simple to use and will get the VE about 90% ~ 95% accurate.

dave w

[EagleMark]

I'm going to use the 7427 for my own projects.
I'm just going to make the adapter to get faster data acquisition in vehicles setup with 7747 ecus. Seems I know lots of people with modified TBI engines that don't quite run right. When I go trash-pickin at the local JY, I don't want to have to always be on the lookout for a 7427 for a "Buddy", lol! I'm having a helluva time tuning this latest truck; it's a "mystery" 350 with a huge cam and a stock stall speed converter. Guy bought it from someone else and got tired of it flooding out on hills (offroading), so he paid $$$ for a TBI harness and put a TBI and manifold on it then wondered why it wouldn't run. That dang 747 gives me a lil bit of data every 1.2 seconds, whether I need it or not ;) and it's just not fast enough to catch the transients.

Anywhoo, I liberated connectors from a 747 box today and I'm just siting down to make up my excel sheet for listing the circuits & location for each ECU. After that, just some swapping of wires, lol.

So you will have an adapter to plug into a 7747 and use a 97427 to record data to tune with? That sounds like a cool idea. Here's a link with the pin by pin change needed:
http://www.gearhead-efi.com/Fuel-Inj...light=16197427

[d0nk3y]

Dave W - thank you! I'll check that out!

EagleMark - You just gave me exactly what I was going to construct in excel: Thank you very much!

~Scot

[EagleMark]

I thought that was what you were up too! No need to re-invent the wheel. You'll find we all work and learn well from each other here!

[d0nk3y]

Have things wired up per the pinouts and not seeing enough over serial data line; i.e. RPM would be nice. Just went though and repinned the harness and checked for shorts and missing wires when I find:

I would also like to mention that the orange Serial Data wire needs to be
relocated from the top row, Pin "E" to the lower row, Pin "M". You will also
need to scan the vehicle like a 1993-1995 G-Series Van, C-Series Truck,
S-Series Blazer, etc with Auto transmission.

So, I wired in a separate ALDL into my translation harness - figure if TunerPro is using a 16197427 adx, the serial line should be in the right spot. I just need to go back out and check out some voltages, but it's too dang cold and dark outside. :D




How's that for STEALTH?

[dave w]

I've recently learned, that the 700R4 TCC control wire is Pin E11 NOT E10!!

dave w