Free Progressive Controller

[kev_rm]

Just a thought here -

Why not:

- add an injector that will flow about 25% of your total injector flow to the plenum
- plumb an alky tank, fuel injection pump and boost referenced regulator to new injector
- wire the injector (-) to an injector bank (- is the signal from the ecu)
- place a relay between ignition (+) and (+) on the new injector, as well as (+) on the new pump.
- activate the relay with a boost switch.

presto - alky injector gets same pulsewidth as fuel, only comes on during boost, flows 25% of gasoline (variable by injector size)

thoughts?

 

[GNVYUS 1]

The alky would be to close to the cylinders for my taste and I would be afraid that some of them would be getting much hotter air than the others and then all hell would break loose, literally.

 

[kev_rm]

The placement wasn't the point. Put the injector wherever you put your existing orifice.

 

[Razor]

Neat idea, but the injector has to be alcohol compatible. That means stainless steel internals. The pump used has to be alcohol compatible. As is the rest of it like lines, fittings, rubber orings, etc.

Stainless steel injector, alcohol compatible pump, and the words FREE .. hehe

Dereks devices made a similar device. What it did was use an electronic relay tied into the injectors to drive the pump through the use of a nozzle.

Only issue I see with this type of system is typically we pull fuel out and replace with alky. Dropping INJ DC also drops alky.. thats where we go south on the idea. As to how do you increase alcohol and drop injector DC further? Thats where playing with nozzles and pressures comes in.. it can be done, but not a walk in the park.

HTH

 

[kev_rm]

Point well taken on the alky compatible parts.

with a stand alone, pulling fuel out @ boost is easy and you would just raise or drop the alky injector size to suit. In fact, mine has dual tables so you can run w/ or w/out, and it'll modulate for you:

http://megasquirt.sourceforge.net/extra/waterinj.html

 

[Razor]

Yup.. but the fuel system is where the issue lies for the injection system. And remember you need to run twice as much alky as fuel to make the same power.. so injector will need to be pretty large.. and alky compatible.

Careful how you research alky compatible.. as some MFG say you can run alky.. but then require you to flush the systems out after racing.. so constant immersion is the key.

Now maybe with your setup you can run the relay as described above and let your computer control its DC to run an injection pump. And trigger it of boost to the motor electronically, not with a hobbs. This would be way simpler system wise in your case. And you'll have to experiment with what DC gives you what pressure.. and how to tailor that to your partiular engine's requirements.

 

[wagon]

Would a simple relay even be able to cycle fast enough to fire the aux. injector as much as the others? I doubt it.

 

[kev_rm]

The relay isn't oscillating the injector in this case, it's just staying on during boost and the ECU is oscillating the injector.