Hi Steve,
This is really interesting. It sounds like you've got a great car! I don't want to ask too many dumb questions, but it sounds like you've got a very well designed system using a GPO to control the hsv (I'm new to the Tec3, but I can't see any other way of tuning the water injection as you've described it except by using the GPO duty cycle table). My WRX has only a couple of inches between the intercooler and the throttle body. I apologize for my ignorance of the MX5 configuration, but how much distance is there between the intercooler and the throttle body, and what is the pipe diameter? I would also love some duty cycle information to understand how much water you're injecting and where in the load curve you're injecting it. Most people would think those jet sizes are very large for a 1.6 liter engine (and they would be right if you just pumped water through at a constant high pressure), but it sounds like you've done a great job configuring the injection duty cycle to control injection rate.
I'll post the findings with my configuration as I work things out, but I'd really appreciate more details on your setup.
Thanks for posting!
John G.
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