Specifications

[marsheng]

I*s there a page with the specifications somewhere
It would be very useful

Something like

Cylinders 1-12
Power 8-15 volts
Current 5 amps
RPM 0-20000

Minimum required
Air temperature sensor 0.5 volt
Throttle position sensor 0-5 volt
etc

Don't delete this one !!!!

[Bernard Fife]

marsheng,

It isn't as simple as that.

A microsquirt will typically draw well under an amp of current. But it sinks quite a bit more from the injectors, idle air valve and other controlled devices (like LED, relays, etc.). See this page: http://www.useasydocs.com/details/wire.htm for details of the fuses you need.

The power should be standard automotive 12V. That is, between ~10 and ~15 volts. Less than 8 volts will cause issues with the controller (and many other components on the vehicle). More than 17 Volts could cause trouble too.

The theoretical rpm limit is 65535 rpm, and this can certainly be achieved and sustained on the bench in testing. However, it does depend to some degree on the input signal used to determine the engine speed. For example, the code would probably run smoother and with increased accuracy on a 36-1 crank wheel compared a 300-1 crank wheel.

Temperature sensors are variable resistors (negative temperature coefficient thermistors), and the microsquirt supplies the voltage to them (using the thermistor as one leg of a voltage divider). The throttle position sensor's output must not exceed 5 Volts. Microsquirt provides a 5V source (Vref) to use with the TPS.

The number of cylinders that can be supported depends mostly on the input options (you need at least one physical 'tach event' per spark event) and the current flow and flyback spikes for the injectors. These have to be determined on an individual basis. Generally 1 to 12 cylinders isn't a problem for the code, and up to 16 cylinders is possible, I believe.

Lance.

[marsheng]

65535 RPM. That is looking at the electronics I presume.

Ok looking at the hardware, I know from past experiences that proxes have a bandwidth as well as the injectors so alternatively, what is the highest RPM the system can run at still giving better power than a well tuned Carb.

The power required. A lot of older race bikes are total loss. So I'm trying to see if I can run this off a battery.

The mega uses < 1 amp, I estimate a small fuel pump to be 3 amps and I have no idea on injector current per injector.

Any thoughts on these ?

[Bernard Fife]

marsheng,

You might want to read these:

http://www.megamanual.com/v22manual/minj.htm

http://www.megamanual.com/begintuning.htm

Lance.