NITROUS OXIDE ( nos / n2o ) advice forum

I had been wondering why Trev had decided to go closed loop with wide band,considering Trev's aversion to wideband.
I wouldn't say I have an "aversion" to wideband use, I just have some doubts about the results that have been reported (and therefore the overall usefulness of wideband use) but hope to be able to achieve at least a higher degree of accuracy and reliability from "our" efforts in this line.

So I decided to look at the reasons why Trev was getting such good results with the "pro" setups.

There had been suggestions of "supercharging" taking place due to the nitrous plume drawing air in with it.This pointed to some weird flow dynamics effect taking place so I thought I'd do some searching.

The "supercharging" would possibly be due to the "Coanda effect" Where in a free jet (of fluid.) entrains (draws in) the secondary fluid (that the jet is shot thru).
This effect is widely used in industry.
Yes the "Coanda effect" is certainly involved but its not the only factor that contributes to the supercharging effect.

If this is what is happening,as engine speed increases and therefore gas speed,so could the supercharging effect,leading to a lean out,hence the requirement for closed loop control.
We don't expect to see lean conditions, as most modern vehicles use some method of monitoring air flow and act on that to maintain correct AF. The closed loop control is mainly to give us another level of accuracy and control to give us a further edge over the opposition.

If this is what Trev has discovered I would suggest that He's about to render all previous (race) systems completely obselete. Best get your orders in!
The REVO alone will do that but these extra features should secure that.

If anyone had any doubts as to what a smart cookie Trevor is,here's an example of a man striving to understand every last little thing he can about the substance that he has spent 30 years (and counting) working with.
Still striving and still learning.

Nige

Re lean out when using pro systems, i could see this being a problem if you injected far from the main jet of a carb'd setup, but if you inject quite close to the main jet, you'll create a low pressure area above your main jet and draw more fuel. IMHO

lorenzo

Were these doubts due to the "accuracy" of the sensors or the people using them?
Both is possible but whatever the reason 'doubts' exist.