ok so heres my idea.

2 454 tbi's
4 injectors that are half the pulse width of stock
2 stock 454 ss or suburban 454 ecu's
Dual Quad intake
455 Olds
Torque cam (like a trucks)

the question:

Is there a way to use 1 stock GM ECU to control both TBI units? Or will I require another ecu to work the second tbi?

The trucks were all done by 4000 right? so is my cam. 1 cubic inch difference...

Would 1 ecu controlling it need to have the signal modified in order to have the correct voltages to operate?

2 ecu's operating two 1/2 duty units getting readings from seperate banks sounds liek it would work.

 

you might be able to make it work with one... either way its going to be complicated... if you use two, you have a lot more than just injection management to synchronize and tune...

 

Read up on the injector driver boards, alot simpler than to ECM's.

 

How about a ECU out of a cross-fire camaro or vette. They had dual TBI's.

 

But each TBI only had a single injector.

 

Nother vote for teh inj. driver board. This should work pretty well on a larger motor. Youd have to watch out for async fueling, though. IIRC, the inj. driver board didnt account for it.

Its definatly possible to use two ecms. The way to do it would be to have a master/slave setup and split the drp signal between the two ecms. Set up a one way serial link between the two so the master can feed pulsewidths and the mode of fueling thats desired. I know the outputs can switch fast enough, but the inputs may be another story. Anyway, this would require that you do some source coding. It would make a neat project, but would be alot more then one might be willing to do.

 

i may be missing somthing but is there a reason why this wouldn't work?

2 ecu's, 2 454 throttle bodies, injectors with half the pulse width of the stockers, 2 o2 sensors feeding off seperate banks.

each ecu would read one bank (left right), and control one 1/2 duty tbi unit (front back). by reading one bank, the ecu would see a picture of how the engine was running as a whole, since instead of reading just directly off the 4 ports it's tb was feeding, the ecu would be getting input from all the ports on say the left side, fed by both tb's.

the benefit of this would be that each tb would be making decisions based on how the engine was running on a whole instead of working against each other.

does anyone make a squarebore mabifold to tbi adaptor/spacer? I'm thinking about just trying to use a single tbi from a 454. I think TBI FI would be cool in an old beater 442.

 

Keep in mind that the runners typically cross feed to each bank of injectors so on each side the cylinders are fed by both injectors. Even with a single plane the cylinders will be stealing fuel from both injectors. Itll be really hard to coordinate the two ecms. Much easier to only have one ecm making all the decisions.

 

Two ECM's could cause one to start going lean with the fuel , while the other one is going rich.

There was some talk awhile ago about running the ECMs in open loop all the time. This has potential.

But as posted many times above: Driver boards!

 

If you jsut want to try it out, you can wire the injectors on each driver in series on both tbis and adjust the BPWc to reflect the extra injector that will be firing. The injectors will only have half the voltage present so they may be a bit flakey, but at least youll be able to try it.

 

I did this with a 7747 and a 900cfm Holley Projection TB for a while. It worked well after quite a bit of tuning.