NITROUS OXIDE ( nos / n2o ) advice forum

If the injector (nozzle) does a good job of atomising the fuel (as our Crossfire does) then fuel drop out due to fuel clinging to the greater surface area is minimal, however you are right when using other kits that have a poor nozzle design.

You can't shut the throttle quicker than the nitrous can move through the system, unless the system has been designed/fitted badly, resulting in excessively long pipe lengths. A correctly fitted system would have very short pipe work and as most intercoolers have exits that are very close to the throttle body there should not be any problems. Having said that, even if you did get "some" nitrous and fuel caught between the intercooler and the throttle body, what problem do you expect it to cause?

Regards

Thanks for the explination.

I would think that the rest of the nitrous that get's stuck in the
tube (3 1/2 feet?) would be sucked up by the idle control and rev high
untill the excess was burned off.

I actually have a dry nos kit on my N/A for fear of haveing a back-fire
with a single fogger.
Backfire + soaking wet menifold = explosion & fire

Agreed, so take away the cause of the backfire (a badly designed and badly fitted nitrous kit) and you've solved the problem. A backfire on a dry system can still cause a great deal of damage so you have only reduced the extent of the potential damage rather than removed the cause of the problem.

Regards

This is an example of the layout of my engine:

http://www.saabturboclub.biz/sraz/4/P5100043.jpg

Where would be the best place to mount the injector? I was thinking of putting it i the rubber hose (close to the battery) but am worried about the sharp bend and the fact it's really close to the throttle body. The pulsoids are mounted on the other side of the false bulk head (coolest place)

That is a SHARP bend. I know this may sound drastic (and the effect on forced induction is less) but I'd consider relocating your battery to the boot. You could then have a smoother curve to the bend. But apart from this you could mount the crossfire just after the bend. You'll probably need to ensure that your not spraying at the axle of the butterfly as you're going to be really close to it. My only concern is - what is the airflow doing after that sharp bend? My instict would tell me to put the crossfire so that it is injecting into the higher velocity air on the outside of the bend. I'm now pressing the TREV! button.

Just a quick 1 about mixture settings can i use my wide band to check mixture instead of the plugs as its alot easyier am i looking for the same 11.3 ish afr with nitrous on?
Sorry to sound thick Tim

You certainly don't sound thick! but I'd post in the "General Nitrous Discussion" section - you'll get an answer quicker there.

cheers