des anyone know the number of holes, size, and angle they are spraying in the stock nozzles? also can replacement nozzles for these injectors even be sourced from Bosch? yes making new ones might be the best way to produce a mass quantity, but what about a limited production run like 3-4 sets for trial?
For the same reasons I won't sell loose nozzles, Bosch does not release nozzles to the public.
Hole size, listen up so we can put this to bed once and for all.
Nozzles are NOT produced using hole size as any reference ever.
Hole size does NOT correlate to flow volume.
Hole size IS NEVER referenced for any reputable nozzle, EVER.
A good example, a cheap knock off nozzle with ".234" holes flows less than a stock Bosch ".184" nozzle, you know why? Because the cheap knock off was raw EDM'd resulting in so much cavitation that the fuel created a vapor block killing peak flow volume.
There is a lot more to making nozzles than just melting a hole in the metal and declaring you have "big holes".
I have the flow data on the US spec 140hp TDI's measuring the raw flow characteristics. I'll see what numbers I can work up and make some simple correlations of nozzle types.
As far as I can tell it makes no difference whether you use a piezo or solenoid injector for peak performance. The piezo does have a few advantages in regards to actuation times, thus better delivery control at the upper pressure and rpm ranges.
Now, Off to my day job....