Good Morning Guys,

So I have been given a nitrous system from one of my racing buddies. He no longer is using it on his car and I figured it would be neat to add it onto my car for some fun... It currently comes with the plates for a 4150 and 4500 intake system (Carb).

Its a Fogger system, capable of 75 to 200 shots depending on the jets, which he gave me all those too.. (Nice buddy... he's going to a twin turbo setup...)

Herein lies the problem... I am still at the stage where I have a L03 305 V8 , open air filter, some mild engine work, headers and 3" exhaust (no cats). Currently building a 383 stroker but that's a few months away.....

My question is... As nitrous plates for a TBI engine are ridiculously expensive and used ones don't come up that often... (IF anyone has one for sale, I'd buy it... And if I need to buy your whole nitrous setup, that's fine too, lol)

Can a fogger system be installed? If so.. where & how? Do I drill and tap the stock manifold?
Can I drill and tap a throttle body spacer to install the fogger nozzles into?
Did I mention if anyone has a plate setup... I'm interested in it! lol

I am new to the nitrous world so have a ton of questions... I've been doing lots of reading on site, but most of the posts are a few years old now...
I do have a high volume/pressure fuel pump, fuel cut off switch, etc...

Anyone with any ideas or personal experiences, please message me...

Thanks in advance...

Rob.

 

 

You could make a spacer, or buy a spacer, and buy the hardware to add a spraybar to your spacer, and basically end up where a TBI plate would put you. Or you could mount a fogger nozzle anywhere in the air intake path. But really, the best thing to do with a nitrous kit is what your friend did, sell or give it to someone else.

The kit isn't where the money goes. The money goes into the gas, which you turn around and blow out the exhaust as increased power. What you'll find out is that a 10lb bottle lasts about half a dozen good hits. Even then the last ones will be soft as the pressure in the tank goes down. Refilling that bottle, especially if you use it anywhere aside from the track will drive you crazy with how quickly it drains your checking account.

 

Eh, I have the opposite opinion as Drew, especially if you got the components for free. I had a nitrous kit on my 305 TPi for about 4 years and it was fun. I stayed with the 100 shot and only tried the 150 shot a few times. as Drew said, it can get expensive to fill the bottle, but the whole car hobby can get expensive the more you want it to become anyways. I have seen some cheap (no-name) plate kits on ebay, but nothing that would have the plate you would need for your engine. I used a CD ignition box to control spark retard (2 deg for every 50 hp; so for me it was 4 deg retard) and also a purge system. I will certainly be installing the nitrous back into my car for the brand new 406 engine to enjoy, once I get all the Holley sniper tuning figured out. I'll be running a 200 or 250 progressive wet shot. but for your basic 100 shot that you want to try, it will be fun. I used to use the 100 shot on the street with no problem at all. I plan on buying a second nitrous bottle too, to keep filled int eh garage so that I don't always have to go get one single bottle filled, at least I have a full reserve tank waiting.

 

I got almost all of my nitrous stuff second hand, and CHEAP. None of it was intended for the specific cars and engines I was using it on, and the parts to adapt the second hand stuff to my specific cars, usually added up to the point where I could have just bought the application specific kit brand new and come out ahead. If I were starting from scratch, I'd buy a new kit intended for my specific application, and Ebay the used stuff and leftovers. Had I done that, I surely would have been further ahead.

I think the part that really bothers me is that $$$ goes into filling the bottle, then it's burned and you have zip for your investment but the experience. It's fleeting. If it's something that only gets used at the track, or for racing, then maybe it makes sense. On the street, it just doesn't last long enough. It's lots of fun, but a $60 refill didn't last long goofing around on the street. With the advent of Chinese Ebay turbochargers, and all the other crazyness of modern times, the utility of nitrous has lost a bit of it's luster.

 

Well really, you shouldnt be hossing around on the street very often anyways if you think about it.
simplicity has its place. nitrous cars are fairly simple in that you basically have a n/a engine under the hood and only a few braided lines on top. no tubing running all over, intercooler, turbo/s, supercharger, belt, or dealing with the insane heat. they are easier to work on, lighter, and with a wet kit you wont even have to change injectors.

i had an sbe LT1 that made a bit over 400whp n/a, and with a 150-175 shot was good for low 9's at around 3100# raceweight. i would think that setup would have been fairly reliable and good for a street car.

 

yea, I still agree that filling the bottle is a pain (and expensive) but I do liek the concept of having a N/a car and then the option of just opening a bottle, arming the system, and blasting more power at the hit of a button, then going back to N/a . blowers and turbos are constantly on, many pipes, more "stuff" in the engine bay, heat, where a nitrous system can be neat and tidy, and only used when needed. thats just me though. I was only spraying occasionally on the street because all I had was a stock horsepower 305 tpi, so it was pretty underwhelming. the nitrous gave it a nice kick but I would still probably get whooped by a stockish LS1 4th gen of course. When I bought the nitrous kit 4 years ago, I knew I was going to re-use most of the nitrous system for my next engine, and now that the engine is in, I already am working on my plan of where to put solenoids and whatnot. With the new 531 hp motor, there's absolutely no need for me to spray on the street anymore, so the nitrous will be for track use only. thats just me. I still think the O.P. will get a kick out of the nitrous system once he finds the correct plate (or makes one from a spacer plate and spray bars), especially since he got most of the stuff for free. I mean a new 10 pound bottle is about $200 on its own, plus solenoids, lines, buttons, etc... only a small amount of money will get him to a working n2o system

 

For a TBI setup?

Buy an adapter plate, stick a nitrous plate under it and then get an aftermarket intake off Craigslist is my vote.

You'll gain some power by doing that N/A as well as when you kick on the jug if you use a decent intake like a Performer RPM or similar knockoff.

Don't forget you'll need to rejet the fueling based on your FP from the TBI system or to have a dedicated fuel system. I would also get a FP gauge and see how much drop you get in fuel pressure at WOT before you assume that's your fuel pressure. With my 4.3L V6 in my Astro I was seeing probably about 4 PSI difference in terms of WOT vs cruise fuel pressure if memory serves right. Been a long time.

 

Thanks for all the input guys...

I should clarify my post a bit I suppose... The car is and will only be a Dragstrip car. It's been gutted, stripped and is being built as a single purpose, go fast in a straight line car.
As mentioned, it currently only has a L03, 305 V8 in it with some minor work done as it "was" a street car up until about 6 months ago... This is a very temporary setup...

So... While I am building my 383 stroker, 2 spd powerglide combo, (Should be ready by summer I hope) I was thinking about moving this nitrous system onto the car so I could go and have a bit more fun on the track with the car..

I am not stranger to building engines and making horsepower... Built and drove several different types of power adders, blown alcohol, Turbo's ,etc... but my main passion lies in BIG displacement naturally aspirated high HP engines... Even the 383 is just a budget stepping stone in my camaro… Plans are for bigger in the years to come...lol

Anyhow... I was just wanting to learn about the nitrous world... Never having used it, the curiosity is there of course... I was hoping to install the nitrous kit but it sounds like unless I either purchase a $700 TBI plate, or figure out a way to install these fogger nozzles, I'm outta luck... lol

I was looking last night and it almost looks like there would be room to drill and tap the TBI body below the throttle plates?
I could mount them up top I suppose, but suspect I will loose a lot of the effects by mounting them there as turbulence would possibly effect smooth nitrous flow?

Anyone have any pictures of fogger nozzles installed on a TBI?

Thanks guys

 

As a silly question what intake are you running on the 383?

https://www.summitracing.com/parts/trd-2534

This is 40 bucks. Could always drill and tap it for a pair of foggers or if you've got one that looks right mount some spray bar into it with an aircraft drill.

 

Thanks Drac0nic,

Intake for my 383 is a Edelbrock Performer RPM, so I'll be able to use the plates that my buddy gave me if I decide to add the system to the new engine... It's a Dart block, Scat forged crank, Mahle Pistons, H-Beam Rods and Brodix heads... Should make some decent horsepower... Can't wait to get it on the dyno... Just not sure I want to add the nitrous to it...lol

And yes... That's exactly what I'll do... I'll drill and tap that aluminum spacer for the fogger nozzles... Actually, at $40 I'll buy two and on the second one, experiment with installing a spray bar into it.

Thanks...

I'll let you know how it turns out...

 

The TBI plate is a waste of money if you're going carbed in the future anyway. Convert the 305 to a 4bbl and get on with it already.

 

I'd snap up a TBI plate system if I could find it. I've thought about making my own, but wasn't sure how that would workout as far as bar placement. No good place for a fogger in a factory-style TBI induction system. And using a carb intake and plate...again, not sure what that does for spray bar placement Vs. TBI bore and air flow (as in getting a good mix).

 

So a quick update....

Had Lordco order me in a TransDapt Aluminum 1" Throttle body spacer today... Picked it up after work...
Drilled & tapped two holes, 1/8 npt, one in each orfice and mounted the two NOS fogger units into the cast aluminum block (one on each side). They are 90* firing nozzles so I pointed them down into the plenum space.
Mounted the block under my stock TBI setup, used the TransDapt Fuel line extensions and voila... I now have two wet fogger NOS nozzles mounted in a homemade setup for the cost of a $43 TBI spacer...
... Nozzles mounted nicely with no interference with any other hose, fitting or bracket...
I bought a second spacer as well as I am going to try a homemade spray bar setup at a later date...

I'll get some pictures in the next day or so... Haven't hooked it up yet and I'm still waiting on a few other parts, need to run the rest of the system, switches, fuel cutoff, WOT switch, etc... but I was pleased to see that it fit... Both throttle plates open freely, no interference...

Now just want to figure out a cheap delay box to soften the hit on initial launch... I'm thinking of adapting one of those NX delay boxes... 0-4sec delay... Least then I could set it up to hit at 100 % within a second or so of initial launch?

Anyhow... I'll let you know how it turns out... lol

 

First go round, I used the setup in the NOS instruction book, with a simple microswitch adjusted to activate at WOT. That setup works OK if you don't mind launching at less than WOT. On the 3.1L I got lazy and went with the Space Invaders switch on the shifter.



That setup was infinitely more entertaining. A person could go the extra mile and add a microswitch on the throttle so that both switches have to be triggered, but it's pretty easy to just not hit the button.

The next setup was going to get fancy.



The catch there is that the WOT microswitch needs to be wired in series to kill the circuit if you let off the gas.

Holley sells the same MSD switch under the NOS brand - 15879NOS

 

I used to run the second setup Drew mentioned. I had the microswitch and in-series I also had a swithc on the handle of my B&M shifter. as a failsafe from hitting the switch during "daily" driving, I would also have to turn the bottle on, AND arm the system. so 4 parameters had to be met for me to spray. bottle on, system armed, microswitch triggered, AND button pressed on my sifter handle. never had a mishap. in hte future, I might eliminate the clumsy WOT microswitch, knowing I'll only be spraying at the track. also, I did not have a fuel pressure safety switch then, but I will in the future setup

 

just need a master arming switch for the system and then a wot switch/window switch combo.
i have had a solid state wot switch that tied into the tps wiring and that worked good. also used one of the little fjo l units that allowed me to program when the nitrous was activated and ramped it in if i wanted.

aside from that, you will need to have accurate bottle pressure, fuel pressure info and a means to heat the bottle to get pressure up to 900 psi. that stuff makes for a really good setup that will be safe and repeatable.

 

I'd like to see some pics of that DragRat2020.