Direct Port N20

[LTb1ow]

Theoretical Question here..

With a direct port setup, do you need larger N20/fuel lines into the main block than say a plate 100 shot?
Also, is the jetting different, I would assume so right?

How imperative is it to check each cylinder to get it 100%? Like say, you jet them all for a 100 shot, do you absolutely need to check each cylinder for good A/F?

Thanks

[Pampered-Z]

I don't play allot with nitris, so I'm no expert, but have been around some of the guys that use them. So this is my best understanding of using big shots on NOS.

With direct port/fogger I'd assume you are doing this so you can spray more then through a plate, so you will most likely need larger lines and you will probably want seperate pump and even a tank (1-2 gallons of real high octane ). You could certainly use the same lines and such as you would with a plate if you running the same shot as you would through the plate. All you're doing it branching off after the selonoid ( again, my understanding, don't take that as a fact? ) The people I know running 175 or larger shots have replaced all their stock lines with large braided lines and BIG fuel pumps.

Also, the foggers systems I've seen split the system into right/left side. You're not running each cylinder seperately, but feeding right side/left side using some type of log or distribution. So when your tuning you can jet and montioring right/left bank, not each cylinder.

I'll try to get some pics of my friend's set-up, but here is one off the web that shows what I mean.

http://www.nitrousoutlet.com/installs/install.asp?id=30

If no one on here can give you more a more fact filled answer I'll get in touch with N2ODave or REB17 and get you real answers, both of them have run foggers on the LT1s.

[sweetbmxrider]

but there is a nozzle in each runner so there are jets for each nozzle. he wants to know how you can be certain each cylinder is getting the same dose of dope.

[LTb1ow]

Yea, this is all kinda hypothetical, looking a direct port setup already made to go on an LT1 intake, so I am looking to see how much work it'd take to get working.

I think it seems like I would need a separate fuel system to feed it. Although say you spray a 100 shot through a plate, using 8 nozzles instead, that 100 shot would be broken down to smaller individual shots, yes/no?

Just trying to make sense of it. Basically will a direct port setup for a total 100 shot need more fuel/N20 than a single plate 100 shot.

[TEKHAWK]

Yellowbullet.com Nitrous Section will be the best reading you will find. The fastest nitrous cars in the country are on this site.

[sweetbmxrider]

that is a great site! i was on it before and there is a wealth of knowledge on there!

[LTb1ow]

Yea, makes my car look even slower...

[LTb1ow]

Well still looking for answers here....

[Frosty]

Why would you have bother thinking about this? You're still not running the times the car should run, you still haven't even hit the nitrous yet(right?). Why would you bother with a pain in the ass direct port on the LT1? If you were running a big shot and still couldn't get things right or something then by all means go for it...but you're talking about running a tiny shot and haven't even tried that yet with the plate kit. Have a set up like that is nothing more than an ego stroker and something to add to your sig.

I'm not trying to be a dick, just some honest/friendly advice from a 3rd party person that has no vested interest in your car. Get the car running 100%, try out the plate kit you have now and then go from there.

[Tru2Chevy]

Why would you have bother thinking about this? You're still not running the times the car should run, you still haven't even hit the nitrous yet(right?). Why would you bother with a pain in the ass direct port on the LT1? If you were running a big shot and still couldn't get things right or something then by all means go for it...but you're talking about running a tiny shot and haven't even tried that yet with the plate kit. Have a set up like that is nothing more than an ego stroker and something to add to your sig.

I'm not trying to be a dick, just some honest/friendly advice from a 3rd party person that has no vested interest in your car. Get the car running 100%, try out the plate kit you have now and then go from there.

Theoretical Question here..

I don't think he has any plans to switch to a direct port N2O setup on his car anytime soon, but there is no harm in asking how the system works.

- Justin

[Frosty]

I don't think he has any plans to switch to a direct port N2O setup on his car anytime soon, but there is no harm in asking how the system works.

- Justin

I know it was at first a hypothetical but it changed into....

Yea, this is all kinda hypothetical, looking a direct port setup already made to go on an LT1 intake, so I am looking to see how much work it'd take to get working.


I wasn't being a dick in the first response, just trying to post up a friendly response saying he's crazy for even thinking about it since it seems like more than a hypothetical. :lol:;)

You know full well if he gets the answer he wants he's going to seriously consider it, he's easy to read lol.

[LTb1ow]

Nope, its a very hypothetical question that was based on a slight chance I may look further into getting it.

And it would be a nice addition to put in a sig if I ever made one. ;)

Point taken and appreciate the 3rd party view point.

At this point, I am just curious on the details of running a system like this.

[S.J.SLEEPER]

ANSWERS:
direct vrs. plate ......... yes direct port uses smaller size jetting per cylinder, you looking for approx. 150 shot than you will be selecting the n20 & fuel jets to make 20-25hp per cyilnder.
if you go to nos website and look up the fogger or pro fogger the instructions will give you your jet sizes for the hp desired.

most direct port(fogger) systems are set to run 175-500hp.

advantages/disadvantages plate vrs. direct port
plate: less parts,lower cost,ease of install, hard hit,breaks tires loose easier,freezing of maf if nozzle in front of it.
direct: smoother hit, better traction, more accurate distribution of n20 to cylinders,higher hp levels, higher cost,lengthy install, can't be hidden normally

hope this answered your questions

[LTb1ow]

So if I were to run the same size shot on either setup, I could theoretically use the same size N20/fuel main lines into it?

[S.J.SLEEPER]

yes
even my 350hp direct port used the same line as my 150 single nozzle setup,

[LTb1ow]

Ok, thats cool to know.

I guess I will go buy it now, Frosty said I would, so I can't let him down...

;)

LOL

[S.J.SLEEPER]

if you need help setting it up or need pipe bender for the tubing,taps, whatever. i have just about every tool there is. well..... almost , just need hptuners and a dyno and i'll have everything i need. he he he ha ha ha

[LTb1ow]

I was looking a pre made setup for an LT1 intake. ;) But budget does not permit it at the time.

[Pampered-Z]

OK, I think I understand what your asking. You would monitor each cylinder by making a pass (run the car up to X RPMs), click it off, pull the plugs and read to see if your rich/lean/timing etc is right.

[LTb1ow]

Yup, problem would be the setup I was looking at is a bit more involved than just pulling each line and changing jets...:shifty:

[sweetbmxrider]

makes it fun. i completely forgot though but thats exactly what you would do. make a pass, kill it, read plugs.

[LTb1ow]

Yea... maybe a winter purchase, who knows... got more important odds and ends to figure out at the moment.

[V]

I'll be running a direct port system in the near future. I have the NOS "NOSzels" that fit under the injector. By searching the web you can find many jet size calculators. You enter the number of cylinders and the hp shot total you want to run and i think maybe a few other numbers(fuel pressure?), and it'll give the nitrous jet sizes and the fuel jet sizes youd need. And like SJ Sleeper said, these sizes will be much smaller than the ones for a plate system or single nozzle. I'll be running larger nitrous lines from the bottle forward due to the HP shot increase plus i need to get solenoids that will support my planned hp levels with the direct port system. Ill also be running a second fuel pump as a dedicated system(all fuel will be race fuel).

As for the ar/fuel question, i dont know exactly, however i am considering running an O2 sensor in each primary to be able to monitor it all. Extreme but effective.

[LTb1ow]

Have not read much good about those things man... why not just do it right?