Hi, I’m new to this forum. I was googling EFI and this site popped up. So here I am.
Now I’m interested in building a replacement ECU for my old Kawasaki 1300 motorcycle.
It’s fitted with an early analogue Bosch system & replacements are no longer available. My ECU is working fine but just in case it fails, I would like a backup.
It has only 4 inputs. They are air temp, engine temp, TPS and ignition pulse. It uses batch firing for the injectors witch are low impedance type. It also operates the fuel pump. It does not have to do the ignition.
I was thinking of building another analogue ECU, using the 555 timer chip & circuit that’s been used in a car project on another site. Here is the link. Analog fuel injection controller with 555 timer - Slant Six Forum
I have many years in electronics, so building something is not a problem. The only problem would be programming. I’ve never got involved in it. I’m more of a hardware than software person.
The original ECU is about 8” Square & 2” deep. I would rip out the old circuit board and fit what ever’s needed inside the original box & use all the original hardware. Building driver boards are not a problem.
So Which Arduino should I use & what software?
Forget “Mega Squirt” it’s overpriced.
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The engine characteristic map will be the biggest problem of your project. It specifies when and how much fuel is injected, depending on the provided ambient signals. Try to find such a map for your motorcycle, before you consider to continue. With a bad map or coding errors you risk to kill your engine!