[robbilau]

I'm not familiar with the RX-7 but a few basics:

I assume the air temp sensor is after the water injection?
Have you done a test run just holding the jet out the window so you can confirm flow?
What duty cycle are you running in your injectors at max? Perhaps the duty is too small for significant injection?
The middle jet will be a 0.6 mm jet pushing 250 cc.min at 100% duty. If you're running say 65% duty on your injectors and the 2d matches that duty cycle you're getting a max of 162cc/min of water. That sounds like too little water to me. Richard will need to confirm the 2d behavior though.

I'd start the water below 10 lbs, say at 7lbs and upgrade to the biggest jet you have.