I'm not sure what the OEM spray motor setup is on these cars, but maybe you could try boosting the voltage:
http://www.autospeed...rticle&A=111490
This was my attempt, ran a cheap supercheap auto washer spray motor at 24volts. It easily achieved a very fine mist, heaps more pressure than at 12V. This is with cheap plastic patio misting nozzles from ebay.
My positioning still needs more work though, was trying too hard for stealth behind the plate and hoped spray would blow back. Instead it hits the plate and drips.
- White Knight likes this