Nitrous on a diesel is very much like nitrous on a gas motor... imagine that
It is an oxidizer, meaning it adds more air. In adding more air it has one other very important property, it cools that air significantly. As such adding nitrous to your diesel is more like adding an on demand big turbo, with really really good intercooler.
Next you cannot lean out a diesel and blow it up like you can with a gasser, as such nitrous is very safe to play wiht on your diesel. In fact the proper tuning method is to goto your local track and turn your juice on, brining with you a bunch of differnt jet sizes and run it with a bigger jet size each time down, untill you slow down and then return to your fastest one. Because nitrous is an oxidizer and NOT a fuel, the only way it will make more power is if you have an excess of fuel, which is why alot of guys run nitrous with propane on there DI diesels, but since we are here to discuss for the most part IDI I will stick with that. So what this means for us VW guys is that in order for nitrous to be worthwile we need an excess of fuel to burn, the easist way to tell if you have that excess of fuel is go for a run and see if you have a thick black cloud of smoke following you even at max boost. If you do you are ready for nitrous.
Again here I will not go into designing a nitrous setup for your car, as there are lots of manufatures out there who have diesel kits that will work for you app. Nor will I recomend jet sizes as it will very from car to car and even day to day with the same car due to atmospheric conditions. So just cause "johhny" used jet "A" when he was at the track last weekend and your car is setup "close" to the same, this week at the track dosn't mean that jet "A" will be anywhere close to what you need.
My personal favorite way to run nitrous on a diesel which I will warn you right now is expensive, is with a progresive contorler. I run my solonoids empty or wide open, no jet at all, and then use the controler to setup how much nitrous I want to run and how fast I want it to come on. It makes tuning easy, as well as it has good launch control, but unless you are serious about it or just have a bunch of $$$ burning a hole in your pocket you are probably better to run jets.
One last note on nitrous get a bottle blanket as it is nessacary to make repeated consistant runs, nitrous performs the best at 1425-1450psi as such it will need to be heated or cooled for the best and most consistant runs.
Okay fine this is my last note, :wink: , If you are running your nitrous on the street as most people like to do a remote bottle opener is great, as then if a makeshift showdown occurs you can be at your best, instead of being I would have been able to take him if my bottle wasnt closed in the trunk. If you only use it at the track, it is a waste of money.
That is all for right now. Make sure to tune in again when Cetane Racing brings you such topics as "a 14sec 1.6 n/a" and "Stickers, where are the dang Cetane Racing stickers!?!"