FAQ: Nitrous - Everything You Wanted To Know - But Were Afraid To Ask

[artichoke]

Originally Posted by Bo'sRT

Yes and No.

I would say anything over a 100 shot should probably be used with a direct port system (IMO)......

The big difference in the SC fueling vs. nitrous fueling is actually pretty simple..... with the aux injectors, you are spraying fuel with an injector at roughly 50psi.......not a bad deal, but coupled with the design of our intakes, there have been issues with uneven fuel mixtures in the front cylinders. With the nitrous, you are spraying a mixture of fuel and nitrous at about 1000psi..... the foggers seem to do a much better job of vaproizing the mixture, FWIW.

And Moose...... there has been one casualty with nitrous....

http://www.lxforums.com/board/showthread.php?t=46725

--Bo

I suppose you might also be getting better durability with NOS vs. the GSM s/c because NOS is usually not being used whereas the s/c is "on" all the time.

[Moose]

(From NS6) Looking forward to your progress! What elevation is the Firebird track at? I'm curious if you'll back-up those sick MPH's. Your car seems to be running 5-6 mph faster then any other car with similar mods. Do you know the jet sizes your using by any chance? I have no experience with running at altitude so I'm curious to see how it works out for you....Keep us posted!

The elevation at Firebird Raceway is probably around 1100 Ft. The jet sizes are (with dual nozzle TNT kit) as follows:

75 Hp Fuel = 18 Nitrous = 31
100 Hp Fuel = 22 Nitrous = 39
150 Hp Fuel = 25 Nitrous = 46

Originally Posted by artichoke

I suppose you might also be getting better durability with NOS vs. the GSM s/c because NOS is usually not being used whereas the s/c is "on" all the time.

There is a lot more to it than that. For instance this is from the Q and A
Nitrous oxide is made up of 2 parts nitrogen and one part oxygen (36% oxygen by weight). During the combustion process in an engine, at about 572 degrees F, nitrous breaks down and releases oxygen. This extra oxygen creates additional power by allowing more fuel to be burned. Nitrogen acts to buffer, or dampen the increased cylinder pressures helping to control the combustion process. Nitrous also has a tremendous "intercooling" effect by reducing intake charge temperatures by 60 to 75 degrees F.

Do you see the 'buffer, or dampen property that protects the cylinder pressures?

And this from the Q and A
Will nitrous oxide cause detonation?
Not directly. Detonation is the result of too little fuel present during combustion (lean) or too low of an octane of fuel. Too much ignition advance also causes detonation. In general, most of our kits engineered for stock type engines will work well with premium type fuels and minimal decreases of ignition timing. In racing application where higher compression ratios are used, resulting in higher cylinder pressures, a higher fuel octane must be used as well as more ignition retard.

So the nos kits have been very successful in not leaning out the un-tunable vehicle where the superchager kits (on the LX Hemi's) have not. The whole trick is not letting that forced air modification to lean out the engine...or, getting too much timing and, espicially both. I assume there are other factors as well with the supercharged problems, but I have not really researched that so I don't know first hand. I do know that 1bad4door, sleeper300 and uuudluuz are very good first hand knowledged folks on that side.

Moose.

[CplDaugherty]

Wow, I was actually looking into this and I'm surprised at how low the cost seems to be. The only thing I fear is 1. killing my waranty and 2. getting that dreaded "yeah but if you take the baby's bottle away..." lol.

[artichoke]

Originally Posted by Moose

For instance this is from the Q and A
Nitrous oxide is made up of 2 parts nitrogen and one part oxygen (36% oxygen by weight). During the combustion process in an engine, at about 572 degrees F, nitrous breaks down and releases oxygen. This extra oxygen creates additional power by allowing more fuel to be burned. Nitrogen acts to buffer, or dampen the increased cylinder pressures helping to control the combustion process. Nitrous also has a tremendous "intercooling" effect by reducing intake charge temperatures by 60 to 75 degrees F.

Do you see the 'buffer, or dampen property that protects the cylinder pressures?

Regular air is 21% oxygen, 78% nitrogen by volume. I believe that's a higher proportion of nitrogen than NOS. And both of them (air, and NOS) are basically just oxygen and nitrogen.

So NOS should provide less nitrogen "buffering" than plain air.

[PimpJi]

thanx for the detailed write up.
answered a lot of my questions

[Need4Speed06]

Originally Posted by Moose

The elevation at Firebird Raceway is probably around 1100 Ft. The jet sizes are (with dual nozzle TNT kit) as follows:

75 Hp Fuel = 18 Nitrous = 31
100 Hp Fuel = 22 Nitrous = 39
150 Hp Fuel = 25 Nitrous = 46

Thanks for the info Moose. I'm just wondering if you of Hal have actually checked the jets installed in your cars. I'm just wondering if your installer played with the jets at all to fine tune the nitrous or if your actually running the recommended 22F/39N set-up from TNT.

[HalV48]

Originally Posted by Need4Speed06

Looking forward to your progress! What elevation is the Firebird track at? I'm curious if you'll back-up those sick MPH's. Your car seems to be running 5-6 mph faster then any other car with similar mods. Do you know the jet sizes your using by any chance? I have no experience with running at altitude so I'm curious to see how it works out for you....Keep us posted!

I do have a small torque cam with Comp Beehive Springs More bottom end, seems to be about the same up top. From a roll NA, DanRealtor and I run about the same, he, jumps out, and I slowly pull back. From a dig, that's a different story. Would like to keep making more HP up top and even higher, but my cars HAL won't let this Hal do it yet.

Waiting back on PM sent to Kelly about his MAF conversion. Now that would open up alot

Will be putting in a larger cam with heads in a month or two if possible. The grind is already done. Just waiting for some kind of tuning. May try just the heads to see what another 45 to 60 HP would do with AZP&S cam #1.

Oh, Devin already answered. My computer was down all day due to moving from the MGM Grand, working a few hours, lunch, checking into a Marriott Residence Inn, working a little in the room, going to get a bite to eat, and the then to the grocery for a weeks worth of food. Back to the room and then set up the play computer. So I'll just leave what I typed up below.

Firebird is 1,100'.

DA at SpeedWorld tonight -500. WOW.

I'm in Las Vegas and will be 29 tonight. My car is in Tempe.

I'm not sure on the jet size. It's a dual nozzle TNT setup. Jetted for 100.

I should have the new converter and the Quaife in by the 15th.

Gee, we don't have jetting for 125, I quess I will go to 150 when everything is working together. Or maybe I won't.

[HalV48]

Originally Posted by Need4Speed06

Thanks for the info Moose. I'm just wondering if you of Hal have actually checked the jets installed in your cars. I'm just wondering if your installer played with the jets at all to fine tune the nitrous or if your actually running the recommended 22F/39N set-up from TNT.

Remember I have GSM CAI, Kook's LT's and test pipes, and Magnaflows to go with my cam and B&G Stage II. So I should be breathing pretty good.

[Need4Speed06]

Originally Posted by HalV48

Remember I have GSM CAI, Kook's LT's and test pipes, and Magnaflows to go with my cam and B&G Stage II. So I should be breathing pretty good.

Thanks for the replys. I think the LT's and cam are helping you out. Thats probably the only two thing you are running that everyone else isnt at this point. I was just asking about the jetting because sometimes shops play with the jetting and the customer doesnt know whats in the car. I was just wondering if you actually checked the jets yourself or are just going by the shop telling you its jetted for a 100 shot.

As for TNT not having a 125 shot...all you have to do is call them and they will tell you the jet sizes to run for the 125. You can jet a car for anything you want...they just advertize 75, 100, 150, etc.

No doubt your car if flying bro. I look forward to reading about your improvements and progress in the near future!

[HalV48]

Originally Posted by Need4Speed06

Thanks for the replys. I think the LT's and cam are helping you out. Thats probably the only two thing you are running that everyone else isnt at this point. I was just asking about the jetting because sometimes shops play with the jetting and the customer doesnt know whats in the car. I was just wondering if you actually checked the jets yourself or are just going by the shop telling you its jetted for a 100 shot.

As for TNT not having a 125 shot...all you have to do is call them and they will tell you the jet sizes to run for the 125. You can jet a car for anything you want...they just advertize 75, 100, 150, etc.

No doubt your car if flying bro. I look forward to reading about your improvements and progress in the near future!

Thanks

My car would be a real turd if I was already running a 150 shot.

I look forward to being able to provide everyone with updates on my progress.