DIYAutoTune Part# JimStim-C
This is a newer version of the stimulator, designed by James Murray (jsmcortina on the forums) that expands on the original stim’s features. The main improvement comes with the addition of a microcontroller which allows the simulation of up to 30 different toothed wheels, in addition to the standard distributor signal of the standard stimulator. Instead of having the Megasquirt set to “Stim for Wheel” to test your RPM input on the Stim, you can tell the JimStim to provide a signal like the one from a Neon, Miata, Subaru, most Fords, and many more. It can also drive ignition input mods with pull-ups.
The improvements don’t stop there. James added a set of user-configurable jumpers that let you wire it to test IAC motor outputs, spare inputs, and spare outputs. You can wire these up with the selection jumper wires. There is also a bank of screw terminals that let you connect things other than a standard Megasquirt to the JimStim. So if you’re looking for a Stimulator to test out your Microsquirt, eMS-Pro, or other Megasquirt devices that don’t have the standard DB37 connector, you can wire one of these up to a JimStim to test it out.
The current firmware allows you to connect the JimStim to a laptop using a special cable, FTDI part number TTL-232R-3V3. This is not needed for regular operation, but lets you set the wheel pattern and output speed to display via TunerStudio, and allows you to program in custome wheel patterns or make the JimStim sweep its RPM output. As most users will never need this cable, we currently do not stock it, but could add it if there’s enough customer interest. Right now it can be ordered from Digi-Key under part number 768-1015-ND.
To power your JimStim, we recommend our 12 volt Stimulator power supply.
You can find the JimStim documentation and assembly instructions at this link.
This one is fully assembled and ready to go. It includes three jumper wires like the ones shown in the picture. If you need more for additional features, order our 10-pack of extra jumpers.
Power supply requirements:
- 1 – 9V battery or a DC adapter meeting the following specifications:
- 12 volts
- 300 mA or greater
- P5 plug
- Center positive polarity