Will, wish I had your short drive to Ab! Smoke yes I have some experience, you need to spray the diesel about 2inches behind the jet efflux just outside the exhaust nozzle. I use 4mm brass tube with the end flattened, the secret is to pump as much fluid as you can as quick as you can, 2 litres lasts me 4 minutes!

Coloured smoke.........when, if you achieve that you will be famous

m