OK guys, I changed my nozzle location (to richen it up) and upped the shot. I get a major lean spike but then go dead rich afterwords. I have a WBO2 in the car and tried it on 800psi just to see what it would do. She spikes so hard the car falls on its face then swings the other way and goes way rich (off the gauge both ways). I have all the safety stuff in my system and upgraded pump and injectors. I would get a spike in the old set-up but not this bad and it would stay on the lean side (12.8-13.0) which is why I moved the nozzles. I am thinking to reduce the rich condition I should move the angle of the nozzles, but what about the lean spike?

 

What is your NA RWHP and have you done anything to the stock fuel system?

 

"I have all the safety stuff in my system and upgraded pump and injectors."

 

did you try and rotate the nozzle a little? It should flatten out the response.

 

You can use a slightly longer nitrous line (sfter the solenoid) to add a "time delay" essense to the initial hit.

 

I have yet to adjust anything. Wanted to get some opinions first.

Todd, So you think moving the nozzles away from the MAF wires will reduce the lean spike? Does not make sense since this is what measures the additional O2. Please explain.

Joey, the idea of spray is to get it to the motor as soon as possible with no delay. It would make sense if I had a traction issue though. But I want nitrous at the noid and into the motor when I hit it.

 

Since you've already moved them, let's not use the word "move". I said rotate. By rotating the nozzle a little, the spray may disperse across the wires more efficiently. The "cloud" burst effect. Also, look at the direction of the fan-out. I'd like to see a pic of your nozzle placement and the type of nozzle you're using. How far away is your nozzle?

 

I have to take some pics. They are straight shooters pointing at the MAF about 4" from the wire. I have them mounted on a steel bar pointing directly at the wire. Only adjustments I can make are the angle they enter the openning(up and down). I wonder what would happen if I rotated the MAF 90*.

 

This is not very specific, and your NA RWHP is still missing....I read what you originally wrote but it is vague without this specific information.

 

i ran straight shooters with the nozzles from the NOS 5177 kit about 4-5 inches from the maf, spraying directly at the maf and it tried to kill my car. try bouncing the nitrous off of the lid right before the maf.

and you said "shooters"...does this mean 2...2 of the 5177 nozzles?

i also had 2 of the NOS straights angled at each other like this / \ but not so close as those lines...so that when they shot, the nitrous from both would collide and make a cloud right before the maf. worked ok but not the best. could try it.

 

Sorry brain fart, thought you had a wet kit. Changing the angle should help the lean spike also it maybe cured with some temp/fuel enrichment tuning. Checkout the writeup Robert56 had on this.

 

Joe, thought you missed it. Did not think any more specifics were needed, but every bit helps in diagnostics eh.
42lb green tops and Racetronix pump with 390rwhp NA on a MD dyno through 9" and locker with 4.11s. Injectors are at 65% duty cycle at peak power NA from what I can remember.

I use dual 5177 nozzles, yes. I will try changing the angle to bounce off the lid more. Oh and this was hitting it on a pretty much ideal NA tune with timing pulled above the max NA load in the high octane spark table. I did not log it, but I could tell that once it went rich, it was not pre-igniting.

It is strange that a direct shot to the MAF wire would cause such a high lean spike. I will try it. Any other feedback from anyone?

 

Well you have to remember the temperature difference from nitrous right out of the nozzle to the MAF. The MAF will typically freeze for a moment or two, then your lean spike. Thats where the fuel/temp tables help out, might try and search Robert56's old threads I think he originally had a simular issue.

 

First off, I would start over with nozzles. Standard working postion and nozzle style are, in the neck 3 to 4 inches from MAF and pointed directly at MAF wires, using 90* nozzles. You will normally start rich, andd that's a good thing. If rich, and likely you will be, you can start by rotating one nozzle to start missing the MAF wire, and you can go all the way to rotating one nozzle all the way back into air stream. Just dial it in.

Check my web sites for the pics of my nozzles in my Vararam, same neck and distance to MAF as the f-bods. I use one 90*, hitting MAF wires (index nozzle so you know exactly which way it's pointing) directly and one straight shooter, also in the neck 3 to 4inches away, which shoots directly back into the air box, and instant 11.5 area a/f and no, noda, zilch, none lean spike, goes instantly to dialed a/f in micro seconds. I have it on logs if ya want to see it.

One thing some miss. Depending on what rpm you spray, and what rpm your WOT power enrichment comes on, they may not be in sink. If out of sink, you'll get a lean spike no matter how it's set up. I have mine set a couple hundred rpm before spray starts, this way you have PE WOT multiplier in operation before the spray hits the MAF wire. Something to check to be sure.

Robert