do you happen to have a wiring diagram for this setup?
do you happen to have a wiring diagram for this setup?
I'm sure I do somewhere lol but will take less time to find via google. 1996-1999 truck 5.7L and 7.4L
-Carl
Other challenges of reverse engineering a '0411 / TBI system include:
Low impedance injectors (TBI) vs. high impedance injectors (native to the '0411).
Injector firing, TBI injectors are firing every Distributor Reference Pulse (DRP) vs. '0411 firing injectors sequentially using the cam position sensor to signal when #1 cylinder is at TDC.
The '0411 Spark Tables (low octane / high octane / optimal) bases timing on grams per second flow (from the MAF sensor) vs. RPM. The TBI spark table timing is Kpa (MAP Sensor) vs. RPM's.
I'm not against the R&D developing an '0411 / TBI system. I'm challenged with the effort vs. net gain?
I wonder about the possibilities using an '411 with the 8 injectors and dual trigger distributor, see pic below.
https://www.ebay.com/p/11017003857
https://www.enginemaster.com.au/prof...fuel-injection
dave w
s-l1600.jpg
Found a copy of the ignition wiring diagram over on lt1swap.com. Guess now I just need to get my head wrapped around what kind of signals are being sent to / from the different type of ignition modules. I am optimistic that GM didn't change things too much.
dave - I don't deny that your method would be more ideal, I am just trying to make something work. You can blame it on my mind wandering too much these days, and the fact that I have an old 91' TBI engine still running the stock ECM. This combined with me playing with / having the 0411 stuff laying around, and it makes me wonder if I could just do a quick and dirty swap. I have swapped other LS stuff, so I am familiar with making the 0411 stuff work in standalone-ish type environments. Granted this was done using my EFILive ... but that learning has shown me how to dig into the OS, and doing CAX's for things not supported.
As for the fueling side, I understand the differences between high / low impedence and am familar with how the TBI fueling works compared to say a Vortec / LS. My hope is that an old school method of either adding resistors in series would suffice, or maybe just wiring 4 of the injectors together into one of the TBI injectors would also work.
The different tables / maps are not a big deal. The 0411 can be made to work in SD mode. Yes, the tables are little goofy if you haven't worked with them before, but its not a show stopper.
Last edited by turbo_bu; 06-10-2020 at 07:27 PM.
I did some more thinking on the fueling part. With no cam position sensor, the 0411 will be in batch fire mode. This means that it will try to fire each bank 1 time in 2 crankshaft revs. To get more pulses, I was thinking about hooking up an injector from each bank to the same TBI injector. Not ideal, but would at least get you 2 pulses ever 2 revs instead of just 1 pulse in 2 revs. I believe that the TBI system is designed to do 8 pulses in 2 crankshaft revs, but need somebody to confirm this.
Does anyone know if hooking up the injector wires to the same TBI injector will cause any issues? The plan would be to solder in resistors to compensate for low impedence TBI injectors.
This isnt going to work for a number of reasons. The biggest obstacle, the TBI injectors are low impedance. The 0411 injector drivers are high impedance only.
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