Help with building your Speeduino, installing it, getting it to run etc.
#69687
I've started this endeavor by purchasing a BLDC motor-driven positive displacement gear pump that claims to deliver at least 50 bar at 900cc per minute, we'll all get to see how far that gets me. I already have several vESC-compatible motor controllers that will accept several different types of control input such as CAN bus, TTL serial, and hobby R/C PWM signals, many if not all methods will be tested to see what is best. While doing so I will continue searching for suitable small engine throttle bodies as anything smaller than about 800cc is seemingly currently unobtanium.

To be clear my project is to investigate the viability of pairing a Speeduino management system with the vESC BLDC motor controller project to create a controllable constant flow fuel injection system that is mechanically simplified at the expense of adding electronics compared to a classic drag or circle track Hilborn constant flow mechanical fuel injection system with its cam or belt driven fuel pump, main-jet (bypass flow pill) and barrel valve connected to a throttle body to both tune and control the flow of fuel into an engine.

The goals of my project are as follows,

1. reduce the cost and overall plumbing complexity vs classic mechanical CF injection. (from now on simply MCFI)
2. overcoming a number of the technical pitfalls of MCFI, such as trimming air/fuel ratios on the fly
3. overcoming the sensitivity some small high-speed engines experience with mixture instability induced by EFI pulsation.
4. multi-fuel staging IE GAS to Alcohol or GAS to Nitro!
#70771
Any news on this?
I have looked around for something kinda like this and found this thread.
If I understand right N2 wants to use a virable speed fuel pump for metering?

What I'm interested in is controlling the metering units of the systems with speeduino.
A system like this could also control the fuel metering on a k jetronic without the mechanical air flow sensor.
It could also be used on timed mechanical fuel injection. Gasoline or diesel!
Or the barrel valve of a constant flow hillborn.

This would allow for easy turning and solve any part throttle fuel control limitations that may exist.
Fuel metering for dynamic boost is very complicated in MFI as an example. A ecu controlled metering unit would solve this.

Have anyone done this? How could it be done? The on/off injector drivers wouldn't work, it would need some kind of servo control or encoder on the metering unit that the speeduino can control.
Could the software tune this?
#70815
Lackoffuel wrote: Sat Feb 08, 2025 9:27 pmHave anyone done this? How could it be done?
This was a short phase in development of carburetors and constant-flow injections systems, toward EFI in the 1970s and '80s. An example (and most big OEMs had them) was Ford's EEC "computerized carburetor" or feedback carb. This was one of the first to use electronics to reach the new emissions goals of the era, and used little solenoids in the carburetor to alter jet flow. A form of early PWM valve operation, allowing 'trim' change in fueling to meet conditions.

The goal was to regulate close to stoich under various conditions and local fuels, in order to feed the first-generation catalytic converters the proper exhaust gasses for effective function. They used the first NTK O2 and Bosch MAP sensors that became standard in EFI a few years later. Their motivation was new government regulations and harsh penalties if they did not reach the required emissions levels, forcing the move from carbs and mechanical FI to electronic control.

While FI was founded on performance for power and economy (mostly Bosch), the world turned sideways and the big focus became environmental performance, changing the primary goals and motivations of factory fuel injection as we now know it. While some performances may be redirected, e.g., emissions performance to power performance; each evolution of OEM electronic systems right up to today have been primarily motivated by emissions performance.

Sure, the Speeduino VE table could be converted to PWM output for solenoid or servo control in a similar fashion, and I wouldn't expect it to be too difficult, but the demand is almost zero. Development needs motivation, and there isn't much of that to create new versions of 50 year-old tech that would still fall short of the fairly old tech we use. If the idea lights you up, then go for it and have your fun! 8-)

Sounds like a 36-1 wheel. First step is to get an[…]

Have anyone done this? How could it be done? Thi[…]

I'm having fun in multiplayer mode! I can observe […]

Hello, I know this thread is little bit older, but[…]

Still can't find what you're looking for?