Small dry shot of nitrous?

[Chris Morales]

If I tapped in a small dry shot of nitrous into the intake of a 4.0T (say, jetted for a 50 shot), would the computer properly compensate with more fuel?

How much hp/tq can the stock fuel system accommodate on an S8 or RS7?

[seanentrust]

Why not just run a wet shot?

[sonjh81]

wet shot is safer, isn't it?

[Chris Morales]

Wet shot would be safer if the stock fuel system doesn't compensate; but it's a fairly imprecise way of adding fuel. On the 4.0T, I don't think a wet shot is a feasible option because there really is no place to tap the intake tract after the intercooler. So the spray has to go through the intercooler. I don't want fuel all through my intake tract and I don't think spraying fuel through the intercooler will get me the proper fuel amounts in the cylinders.

[kouzman]

it all comes down to the ecu's ability to compensate the need for additional gas.

That would be a questions for APR and the other tuners. They could possibly write a map for you, where they run it rich from the get go and they adjust the necessary timing changes. I don't remember if you retard or advance with nitrous.

Changes are that even if you use the smaller 50 shot, you will probably see more power!

[MattACK]

Injecting a wet shot through the intake pipe pre-turbo can be problematic for the compressor wheels and can damage them over time from the fuel being sucked through blades and eventually deforming the leading edge of the blades. I don't know how the intake manifold setup is like on a S6, but generally you want to inject just before the intake manifold, or ideally port injection in each intake runner.

Are these cars MAF based or MAP based?

[demonmk2]

It could be possible to tap the fuel and nitrous through a spacer behind the throttle body.
Shouldn't be to difficult get one made.

You'd be better of with a meth tune or e85 tune imo

[Chris Morales]

I'm going to have to ask APR. Hoping someone at APR (Sean?) will chime in here, as has happened before. I was thinking about maybe needing a special nitrous map. You generally need to retard timing with nitrous, but maybe running race gas and say a 93 tune would compensate for that. I imagine a "50" shot would yield a good deal more than 50 hp...and lots of torque to get out of the hole. May get me into AMAX trouble.

I would not inject pre-turbo. Just post-turbo, pre-intercooler, which appears to be the closest to the cylinders you can tap anything thanks to that integrated intake manifold along the front of the motor. I'm not interested in injecting fuel into the intercooler.

We've seen what the race gas tunes can do, and I'd expect a meth or E85 tune to approximate or slightly surpass those results because of the cooling. I think even a small shot of nitrous would do more. Just looking for an edge at the drag strip.

[demonmk2]

Just remember if its going to be used to get out if the whole quicker the more prone you're gonna be for something breaking I.e. axles/mounts/transmission, maybe. The weight of the car will not help that sinerio either.
If you have never used it....when it's on, it's on....there's no curve.

[VVG]

My car topped out at 140. I need NOS...one of these.... And Harry, I need it by tonight.

[ntsantos]

My car topped out at 140. I need NOS...one of these.... And Harry, I need it by tonight.

[MattACK]

Just remember if its going to be used to get out if the whole quicker the more prone you're gonna be for something breaking I.e. axles/mounts/transmission, maybe. The weight of the car will not help that sinerio either.
If you have never used it....when it's on, it's on....there's no curve.

Last sentence is incorrect. Plenty of progressive controllers available.

[demonmk2]

In stages yes but not a progressive spray to create a curve. As speed increases you can implement a progressive system, but the comment I was responding to was talking about getting out of the whole faster. I.e. a dead stop

[MattACK]

There are several progressive nitrous controllers that work off of time, mph, throttle position, boost pressure, or rpm. You can trickle it in off the line and ramp it in as soft or hard as you want to. This is in addition to stages. Not sure what your experience is with them, but this is where the tech is now. It is simply pulse width modulation of solenoids, just like most modern boost control systems.

[Chris Morales]

It was never an idea to spray from a dead stop. Of course not. My thought was hitting around 4K in first gear when the car is about 30 feet out. Not trying to break anything.

[demonmk2]

I'm going to have to ask APR. Hoping someone at APR (Sean?) will chime in here, as has happened before. I was thinking about maybe needing a special nitrous map. You generally need to retard timing with nitrous, but maybe running race gas and say a 93 tune would compensate for that. I imagine a "50" shot would yield a good deal more than 50 hp...and lots of torque to get out of the hole. May get me into AMAX trouble.

I would not inject pre-turbo. Just post-turbo, pre-intercooler, which appears to be the closest to the cylinders you can tap anything thanks to that integrated intake manifold along the front of the motor. I'm not interested in injecting fuel into the intercooler.

We've seen what the race gas tunes can do, and I'd expect a meth or E85 tune to approximate or slightly surpass those results because of the cooling. I think even a small shot of nitrous would do more. Just looking for an edge at the drag strip.

That is what I was responding too.

"

[Chris Morales]

I know. I think we're very clear at this point on that. Didn't mean to imply that I was considering hitting nitrous from a dead stop, and I never was. I'm not a novice and I've sprayed before. This really went sideways with that one interpretation of one line. We got it.

[demonmk2]

If or when you decide to do this update this one or start a new thread.
Very interested to see how much of an advantage this makes.
I'll shut up now.lol

http://www.nitrous.info/nitrous-with-turbos.htm

[E55toS6???]

What ever came of this nitrous shot or thought of it