Went out for some test & tune on the hwy & something went goofy. First run went lean & AF switch shut it down! Tried again & same thing. This is a brand new plate kit that I have put 5#'s through.

I know your not supposed to do this but I shut the Nitrous off at the bottle & hit the throttle & the fuel hit as it should. So I try another run & it runs pretty good but is pig rich at just above 10.0to1.

Check everything again, lines, power etc. Try one more run on the way, went lean & shut off. WTF?

This is a new plate kit from Nitro Daves. I checked my wiring to the soleniods & they looked good. Both positive wires are together & soldered to the wire coming from the relay. Both grounds are grounded to together, so I would think that the nitrous & fuel either both come on together or not.

Is it possible to have a new fuel noid go bad? They are the NX Iceman noids. Can a bad fuel noid give too much fuel? I didn't think that was possible.

 

Too much fuel would be opposite of the lean switch setting, but would be caused from a stuck open noid. Are you talking about a Fuel Pressure Safety Switch FPSS or an AFR Switch? If the FPSS is not adjusted correctly it will shut off and do some funky things. If you are indeed using an FPSS, I would look into getting some logs done, eithe dyno or street and see where the AFR is before messing around anymore. If your running out of fuel pressure, its normally the pump...whens the last time you replaced the fuel filter? What pump you running? Shot size? Need more info please...

 

Is this the DynoTune AF Switch?

If it is, I noticed there are different DIP switch settings for Wideband, vs Narrowband, I would start on confirming the correct dipswitch setting for which ever one you are using.

 

I have a AFR switch from dynotune. It went lean on 3 runs & pig rich on 1 run. It's all over the place. I logged each time but they are confusing because the nitrous shut off at around 4400 RPMs at damn near 16.0 to 1 AFR.

On one run it ran without shutting off in 2nd & 3rd gear but was pig rich at just above 10 to 1

I have the racetronix kit & have the 100 shot pills.

I didn't have noids sticking open, when the kit shut off AFR's went normal.

It seems like the fuel noid is not being consistent but not sure.

 

I will check this, didn't see any dip switches. I assume they are inside the case?

 

Maybe it is just a lean spike causing the system to shut down? This is the first time I have logged a nitrous run.

The one time that it did hit & stay on it was at like 10.03 to 1. Isn't that too rich?

 

Hmm, Pull the lines off the plate one at a time and test fire the system. Make sure both solenoids are flowing. Then check the air fuel switch. Dont guess though. If its the air fuel switch great. If not and you keep testing it the motor will not hold up at 16.0.
Dave

 

Still working on this. I have a leak coming from the filter on the nitrous line. I will get this fixed.

After reviewing the logs I think that it may be just a lean spike when the nitrous engages causing the AF switch to shut it down. I didn't get any knock, the 16.0 was just a brief moment then shutdown. This was when I was going WOT from approx. 4k rpms. When I rolled into the throttle with the window switch set at 3k rpms the kit came one & stayed on.

I am going to try setting the switch a little leaner.

 

How big of a shot.?
Check all fuel thing related. Make sure the jets are in the correct placement and are the correct jets for a given hp. With fuel only the car should have trouble staying running even at wide open throttle, might have a small piece of trash in a jet.
Fuel noid could be swollen and not suppling enough fuel when needed but still flowing enough fuel to go rich with out the nitrous.

Ricky

 

100 shot. Going through everything today. I will update tonight.