Powerfc D-Jetro And Nitrous - Tuning

[colinhunt]

Hi all

A couple of mates bought me a NOS branded nitrous kit (it's a "Sniper" wet kit, with 1 fogger) for my birthday (lucky me! ).

It looks pretty simple to install.

What I can't get my head around, and I've done a fair bit of searching and reading around on the net for this but still can't find an answer, is how is the tuning done?

1. From my research it looks as though the timing needs to be retarded during the period for which the nitrous is being injected.
2. How does the PowerFC (or any ECU for that matter) know when the nitrous is being injected into the mixture? For example:

a) 1 run at the drags I run with nitrous, the ECU somehow injects it during a certain range of revs and retards the timing at the same time.

b) Next run, I turn the NOS off. Presumably during that same rev range the timing will be retarded which I guess is a loss in power? So 99% of the time (i.e. when I'm not using NOS) I will have less power through that rev range? So does that mean I need multiple maps?

3. Do I need a NOS controller so I can program the rev range for which I want the NOS injected? I'm only looking for more mid-range torque/power, not top end power.

4. Are there ECU's available (Vipec perhaps?) that have inbuilt nitrous control to avoid having to get a separate NOS controller if using my PowerFC?

Thanks for any advice! I'm totally new to NOS and really don't understand the tuning side of things.

High level mods are: GT35R, stock bottom end, running on E85 full time.

[Ben C34]

Take car to tuner. Let them tune it.

You don't want to explode your engine do you?

You would have to change ecu to allow map switching with the nose.

[zebra]

What pills does the sniper kit come with?

From memory they aren't a big kit.

Buy a data logit kit. Have a map tuned for the gas. Use data logit to swith between the maps. Ie upload the gas tune when using it. Then switch back to the normal one when not

[Dose Pipe Sutututu]

More so you need to richen up the mixture as NO is introduced into the intake, as NO will cause the "current" fuel mixture to lean out.

Just think of lightly as compressed air entering the combustion mix, as you introduce more air, you need to supplement that with a fuel source.

More advanced ECUs will allow you setup an input trigger so as the NO is injected your fuel mixtures richen, with the PowerFC I'm not sure it's possible as it has no AUX inputs. Another common old school setup is to run a separate fuel injector to inject extra fuel in as NO is sprayed into the motor.

[Ben C34]

It's a wet kit John, meaning it also injects fuel.

Where are you planning putting the fogger to ensure even distribution. That's what I would be worried about

[Dose Pipe Sutututu]

It's a wet kit John, meaning it also injects fuel.

Where are you planning putting the fogger to ensure even distribution. That's what I would be worried about

ooo totally missed that part haha.. skim read the OP and saw retard timing, NOS and PowerFC

[colinhunt]

It's a wet kit John, meaning it also injects fuel.

Where are you planning putting the fogger to ensure even distribution. That's what I would be worried about

The fogger placement I was going to leave to the tuner. I would install the bulk of the system and stop at fogger placement / installation as this is obviously a critical element to the effectiveness (and safety, no doubt) of the overall installation.

Cheers for the responses guys. I made a phone call to a tuner today and he suggested that switching between maps via the Datalogit wouldn't be the way to go - I didnt query why though. Not sure then if I should consider upgrading the ECU to something along the lines of what jonnilicte suggested - something with an AUX port such as a Link G4 or Vipec. Bummer!