Anybody have any home built ECUs for sale?

[eddy67]

Hi I am new to this site. I'm looking for somebody that's built their own

ECU's from scratch. I've been using several off-the-shelf ECU's,

do to the way my fuel is delivered, these ECU's do not work very well.

I'm looking for an ECU that just works more like electronic speed control, in other
words when I move the throttle stick up a little more Voltage goes to the pump.
Currently ECU's remember stick positions and then turn it into a power
setting, or voltage setting. My fuel is used to cool the bearings so it is heated and cooled before entering the combustion chamber possibly some small air bubbles also, i know this bad but, this causing small fluctuations in the RPM and the ECU cannot find a stable enough rpm to set the power setting. I have run it of a power supply and it runs great just not with any ECU.
I still need it to operate propane, measure RPM and
measure temperature I do not have electric start, although that may come
later. When it comes to electronics I am useless so for me to try to do this is a waste of time. Anybody have anything that might work?

[slittlewing]

Hello,

I have built an ECU from scratch, and more recently a standalone PWM controller:

youtu.be/DtDdW-goxmQ

The ECU has about 4 separate PWM controllers and inputs for pressure sensors, throttle, temperatures etc.
However, what you are describing with the pump speed fluctuating due to air bubbles is probably going to be a problem for any normal “PWM” controller which just supply a set voltage and don’t care about current.

When you say you have tried some off the shelf ECUs, are you referring to generic PWM controllers such as those available on eBay?

Cheers
Scott

[eddy67]

When I run it with a adjustable power supply or a ESC it runs fine, just not with a turbine ECU. Have you tried your ECU on a turbine yet?

[slittlewing]

Ok that’s good, maybe a normal PWM controller will work then?
Yes, I am running my ECU on my Jetbike:

youtu.be/l3g4zaIBnhg

It has been a learning curve to say the least! The problem is though, it is not easy to “sell” an ECU because it needs to be programmed for the individual engine, and needs to be compatible with the sensors fitted, system voltage, types of pumps used, automated start routine.. etc etc. So it ends up being bespoke!
For that reason, I suggest maybe you could use a generic PWM controller for your fuelling?
Cheers
Scott

[eddy67]

So where do I get a generic PWM controller?

[wannabebuilderuk]

www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311&_nkw=pwm+controller&_sacat=0

[eddy67]

Oh
Yeah I have one of these
www.pololu.com/product/2991
works great but i need rpm feed back and temp feed back, can that be incorporated into this?

[ebweiss2]

You don't need an ECU for that. Have you played with Arduino? Sounds like a very simple setup. What exactly does it need to do? Just control a fuel pump at given RPM? What is it going on?