How close to the MAF is too close for a dual nozzle dry install? Any chance that the spray will damage the fine wires in the MAF? I have one nozzle mounted in the rubber boot that attaches to the MAF and the nozzles are about 4" away from the wires pointing right at the MAF. Thanks-chuck.

 

You never want to aim the stream directly at the maf it will freeze and potentially damage the MAF. We like to bounce the stream off the sides or roof of the box to deflect it and let it settle into the air in the box, it works great that way

 

Hmmm... Not exactly the going thought I've seen. Robert states just the opposite and just happens that it worked MUCH better (4 inches away pointing right AT the maf)

 

Mine is very close to the same positioning as the photo, except I'm using just the nitrous side of a pair of NOS foggers. Id rather not screw anything up. Thanks-Chuck.

 

The freezing is of the screen, which should be removed. The wires are fine and will not freeze or have problems. 3 to 4 inches is ideal, and you start with a good a/f which in most cases is fine from the get go. If you do as Scott suggested, it will hit slower and softer, and many times mixes to much much with incoming air for a diluted reading at MAF, and then can be lean from the get go and stay that way. I used to rec this method also, but have found the direct route to be much more accurate. The general rule is, close equals richer, farther away means leaner. So, if ya start to far away and are lean, then only going into the PCM can fix this. You can see how the to methods can give different results by comparing the two dyno sheets I posted in the wet vs dry thread, and also explained in more detail.
Robert

 

We have seen the read wire in the maf freeze and get destroyed with direct force/aimed nozzle streams.

We do not aim nozzles directly at the maf wire, not worth the end result which is a non functioning maf

 

I'm having problems with the halo spray bar. The nitrous appears to spray from the bar and hit the lid at an angle. The maf is not consistently picking it up according to efi-live. Pretty much what Robert was referring to.

We are going to switch from the halo bar to a 5177 dual nozzle spray set-up this weekend. I think we should have better luck with the maf "seeing" enough nitrous to enrich the mixture and pull timing as we have set the tune up to do.

 

The 5177 if using the location and the stock nozzles that NOS suggest/supplies, they will run lean in most cases. They spec the nozzles to far from the MAF and supply straight shooters that go to center of air box. If you have an aftermarket cai, the best spot is in the neck where it turns into the MAF and use 90* nozzles.
On the spray bars, yea, that seems to be an issue, running lean, and not knocking an innovative idea, but these are the problems which have been going on for some time and one of the reasons people believe dry to run lean and/or be hard to tune. Miss information on the dry hits come from all angles in the nitrous industry, imo.
Robert