Alright first off the system is derived from a plate kit that I bought, a Fogger2 Nozzle and purchased the lines. Well my lines going to the nozzle are -3 brakeline(Braided S.S.). Everything is working good. No FPSS, bottle pressure is at 1000-1100. Running 62/35 jets. Timing pulled out 3.5 degrees via Mallory box. Also have tr6 plugs gapped at .035.

The problem is that when you hit the nitrous it seems to be not making very much power, I have had a 125 shot on a Mustang in the past and it was hit and pulled so much more compared to this car. So I wonder if the -3 lines are to small? Is the fuel pump possably on the weak side? No lines seem to be plugged checked that. I ran it in the 1/4 it went from 102 mph to 111 mph. That to me does not seem right. My Mustang went from a 98-99 mph to a 114 mph. Any help or suggestion would be great cause I would like to get this tuned in before I go back to the track. I think it should net 116-117 mph.

Thanks,
Jeff

 

So is this a single nozzle set up? What size/brand are the 'noids? Was the bottle just filled?

Matt

 

Bottle was filled at track so yes. Also the noids are from a kit the Nitrous Works make that was origanally a carb set-upo and was adj up to 200 or 250 I do beleive.

 

You're running a .062" jet and picking up 9 mph. Sounds like its working great to me.

Your -3 line (.130 id) has over 4 times the area of the .062" jet. The line size is fine.

 

Car only picked a 1 second and nine mph, hell the Mustang went from 13.7 to a 12.3 and picked up 15 mph on 25 hp less shot. This car also seems to not pick up like the Stang did when on the juice.


Could fuel pump be the reason it is not running hard on the juice. If someone that has had a a starvation issue please chime in. Also is the Fogger2 nozzle any good?


Thanks for the help so far guys.
Jeff

 

And your fuel pressure is what on the bottle vs. off? We know nothing about what car you have. If you are comparing a 302 to an LT1 350 for example the two engines aren't even remotely similar. (well they do share a 4" bore) A smaller engine will have a greater reaction to the same nitrous tuneup. Smaller, more restictive heads will also likely respond better as the engine is already starving for oxygen to a degree. Rear gear/transmission will also have a pronounced effect. MPH gain at the track is likely to be higher with a higher ratio gear.

The short of it is you can't make a direct comparison to determine if you have a problem now.

If you have comparable fuel pressure on the bottle vs. off then you don't have a pump problem. You have to have volume for there to be pressure in a return system.

I think Billy Glidden picked up .15 sec in pro-stock several years ago with a similar nitrous jet according to his "tell-all" article in SS&DI fwiw.

 

I do not have way to determine the fuel pressure on the car as of yet. Do have plans on adding a Fuel pressure gauge but was waiting to do a cowl hood and mount it on the cowl. Do you have any suggestions on checking the pressure? Is the obdII cars capable of reading fuel pressure through the computer? My friend has the snap on deal for the car.


As for gear ratio the Stang had 3.73's on a 26" tire. The Z has a 4.10 on a 28" tire.

The car does not pull hard at all with nitrous flowing it has hit decent and falls of, bottle pressure has never been below 900 even after using the nitrous. Really baffling to me.

Thanks for the reply's so far.
Jeff

 

Okay, on the shopping list for everybody installing a nitrous kit should be a fuel pressure gauge. Don't wait to do this as its extemely important for engine safety as well as performance on the bottle. You need to make sure your nitrous kit "hit" doesn't take the fuel pressure down any farther than 2 psi at higher rpm. You can use your frieinds scanner to look at the knock sensor and see if its pulling a bunch of timing out. Never activate the nitrous with less than quality premium gas..ie Amoco/BP premium or similar.
Something that slipped by me last night was that you are using a .062" nitrous jet in a fogger2 nozzle.Its been a while but the largest reccomended jet is usually .048" With your fuel jet scaled for efi pressure you might just be way too rich. Where did you come up with your tuneup?

 

Using a calculator off this board not sure which one but also did some research on the search button and most where using the .062/.035 for a 150 shot.

I do understand the importance of a fuel pressure guage but the damn things are are pain to mount and tend to flat scare people off! I like to do some street racing events at the track and the guage is not an option as for permanent mounting. Might have to get a cheapy and do a hood shut type mount on the cowling for tuning and then remove for racing

I have ran boost in the past and always had a guage in plain site! It is you only chance to saving the motor, but **** figured a 150 shot on this stock 64k mile motor should be alright, and if it blows wqell geuss time to build the stroker! LOL

Please tell elaborate on the nozzle!

 

I think you on to something cause it is what it feels like no power and fat, The nozzle could be the problme i wondered about it the whole time!

Off to do the research on this nozzle.


Thanks
Jeff

 

You're jetting looks right. Stupid, I know, but did you check to make sure the .062 N2O jet and .035 fuel jet are in the right places and not mixed up? How about any junk in the line or by the solenoids?

Matt

 

Yes I did check that. last night to be exact and the lines seem fine up to nozzle but did not check nitrous side of nozzle, will do here in a bit. Also the fogger2 nozzle is supposed to be with a multi direct kit so i wonder if it is not capable of flowing the n20 by itself?

Anyone that can check that would be great. I plan on calling NOS tomarrow.


thanks,
Jeff

 

Right. I wish I could tell you the internal diameter of the nitrous passage and orifice but I can't. Do what HSW said, especially if you have a stock n20 solinoid inlet fitting. Those have a screen in them designed to trap particles in the system. They are a maintenence item that people forget about and can restrict nitrous flow when they start to fill up with trash. NOS tech is usually helpful and can tell you the maximum jet size the nozzle will support. I checked the instructions for the Pro Fogger kit for you and they don't list jetting past a .042 or .044.

 

Dubious? jet chart I found while researching your nozzle..for port efi fuel pressures.

34/18 40HP
37/22 50HP
39/24 60HP
41/26 70HP
43/28 80HP
46/30 100HP
52/33 125HP
61/38 150HP (max for 1 nozzle)

If this is true then I apoligize for questioning the flow capacity of 1 nozzle. @ .062"

 

I plugged the jet size into this nifty n20 calculator I found and the .042 nets exactly one second on my car according to the chart, and the .062 nets like 1.6 seconds.


Sounds like I am calling Holley(NOS) in the morning.

Thanks again guys keep you updated.
Jeff