FSJ Guy wrote:If you're going to get a laptop, might as well get the programming equipment, too! :- )
http://www.moates.net has what you need. But if you're not comfortable soldering, you can have a friend do it. Since you've figured out how to run Linux, I suspect you'll be OK running the EEPROM burner program and TunerPro on your laptop. If not, ignore this paragraph and have someone else burn your chips for you. LOL!
It is ideal to get the harness from the vehicle that you got the ECM from, but if you can't, it's easy to repin a harness and add pins.
If you add timing control to your system (highly recommended!), you can trigger the ECM DIRECTLY from your stock distributor. And still use the streetfire box. Welding or some other method is required to lock out the mechanical advance on the distributor.
See my website for a description of how I did it.
Also, http://www.gearhead-efi.com is an EXCELLENT source of information, including wiring diagrams and ECM pin out data.
Yeah, I checked your dizzy welding link last night. Is there any reason I can't leave it in the vehicle while doing this mod?FSJ Guy wrote:No need to remove the weights. I just tacked welded the mechanical advance together. Leave the springs in there so you're welding it together with ZERO advance. Leave the vacuum advance in place. It, too, will hold the distributor at zero advance. Run an vac hose underneath your air cleaner if you need to have it hooked up for visual inspection. :- )
The distributor output will go to the P/N pins of the 7 pin ignition module. Plenty of schematics on how to wire that up. Again, check http://www.gearhead-efi.com for schematics, etc.
As long as it holds between 12-15mpg, I think I'll call it a win. I'm not expecting 18-20 out of it.Blake wrote:Wiring up the dizzy to the TBI is always the confusing part. You can actually get the P and N wires reversed and it will run, but badly. When wiring up the ignition, I just put them all together so it runs the best, then deal with cleaning up the wiring properly after it runs.
With regards to some of your questions that you PMd me:
MPG - you MPG will vary. TBI does not necessarily get better mileage. I really depends on how you tune the fuel maps/ignition maps. I would not be surprised to see a slight decrease in mileage as the engine can run as it actually should. Sometimes carbs are a little lean.
This is my plan-to bench test everything first with fuel using a platform over a catch can for the tb. I do need to snag a decent laptop computer. I believe something obsolete with basic xp and a cd and usb drives would suffice. I'll call Bill and check out moates or tuner pro for system requirements.Blake wrote: You do need to go ahead and start playing with winaldl and/or TunerPro. I suggest you setup the wiring hardness/TBI/sensors on the bench and get it connected to your laptop and working with those programs. You should be able to see the status of the 7747 ECM and all the sensors on the bench. For bonus points you can connect a dizzy/coil and turn the shaft to get it to fire the injectors. All on the bench. Wiring tip: if you have a stock and unmolested TBI harness, the best way to feed 12V power to the system is a red wire (that I think has a white strip) near the actual TBI connector (the big one that goes thru the FW). There is another connector there that feeds into the stock GM wiring harness under the dash of the truck. Oh and another tip: the red/white strip wires are typically switched Key On 12V +. The Orange wires are typically the constant Battery 12v + that is always on when the battery is connected. The ECM needs power even when the engine is off. The GM wiring color scheme is actually pretty consistent even to modern day engines. I know my 8.1 vortec wiring harness was surprisingly close to the old TBI stuff with regards to the wire colors.
From what I read, if properly installed, the system should run and drive decent enough to not need an immediate tune. 15mpg highway in stock Waggy form is my goal. Thanks for your assistance.Blake wrote: I think of a junkyard TBI conversion to have essentially two phases: First phase is physically wiring and plumbing it up and getting the engine to run. Second phase is tuning. I'm still stuck on the tuning phase on my AMC 360 junkyard TBI on my rock crawler Honcho. It runs pretty dang good and actually achieved 15MPG on the hwy a couple of years ago (it has AMC 360/nv4500/atlas/tons/42's and 5.38 gears). But my cold start is not always perfect. I've since moved offgrid and tuning my TBI is pretty low on the priority list. It starts and runs fine, just no longer 'perfect'.
Good luck with your conversion and post on here with any questions. There is a LOT of information (and misinformation) out there on the net. We can help you on here tho...
Huh? Both mine and several others I've helped folks with, are all 0* initial in tune/engine initial timing at 0*, and they run just fine.Blake wrote:It won't run (much at all) on zero physical timing. I think I have my honcho set for maybe 10 degrees ish of physical timing AND have added timing in the tune.
I know there are issues with the gear if mounting another dizzy. Do I reuse the original, or is there a new one that is high quality?FSJ Guy wrote:If you're going to get a laptop, might as well get the programming equipment, too! :- )
http://www.moates.net has what you need. But if you're not comfortable soldering, you can have a friend do it. Since you've figured out how to run Linux, I suspect you'll be OK running the EEPROM burner program and TunerPro on your laptop. If not, ignore this paragraph and have someone else burn your chips for you. LOL!
It is ideal to get the harness from the vehicle that you got the ECM from, but if you can't, it's easy to repin a harness and add pins.
If you add timing control to your system (highly recommended!), you can trigger the ECM DIRECTLY from your stock distributor. And still use the streetfire box. Welding or some other method is required to lock out the mechanical advance on the distributor.
See my website for a description of how I did it.
Also, http://www.gearhead-efi.com is an EXCELLENT source of information, including wiring diagrams and ECM pin out data.