does anybody know what the highest shot of nitrous, i.e. 50, 60, or 75-shot, one can go on a sr20 without changing or working on the internals?

I think 150 is the highest ive heard off.

im pretty sure 100shot your goin to need fuel pump +injectors

Thats
true, but thats not the internals.

Honestly..

I don't think anyone really knows. I think the biggest anyone has tried is 140-150 Miko? Nobody really knows what the limit is. With a good setup and perfect tuning who knows? Its just like turbo, some people have made 409whp without playing with internals. But I know NOS isn't nearly as linear as turbo can be. Anything above 80hp I'd suggest a direct port setup. I know some people don't go direct with the 100shot, but thats just personal preference. I know JWT was once talking about doing a progressive Nitrous setup but I think they lost interest. I think it would be interesting to see how far you could go.

Luis M
93 Classic
13.3@101.7 JWT 50shot

100shot u will need 370cc injector but the fuel pump is not necessary. You could have it just to be save and a fuel pressure regulator.

I think 150shot is the highest without internal work.

I've done 125 shot, here's my advice.
This is based on a 4 fogger wet setup.
75hp max without bigger fuel pump, spin 1st,2nd-street tires
100-125 absolutely worthless on street tires until mid-top 3rd.
You will probably tear up transmission or misshift and pop a rocker before you need upgraded internals. I don't think you can get anymore then a 150hp with 4 foggers? Someone can correct me if I wrong, ie if you want to go bigger then 150hp you'd have to have 2 foggers per cylinder(8 total).

I have heard of this guy down here in FL who was juicing a Classic with 175 shot. He was using a progressive NOS control box. It gave him 100 shot out the hole and 75 up top in 3rd gear. The car was completley stock only mods were Intake and exhaust and it ran a 12.40 at some crazy speed. It was pretty impressive.

thanx everybody. that was most helpful. i dont have a sr20 yet but if i do decide to get it, i want to have the basic mods and 75-shot by the end of the year. then i can save money and start doing other kool stuff to the car, i.e. cams, bigger injectors, better fuel pump, and the like. does anybody know what kinda times i will be looking at w/ basic mods and a 75-shot? thanx again.

On stock internals, a 120-150 shot is do-able. However, you will need a controller and a higher-flowing fuel pump. It will be almost uncontrollable without the progressive controller, and you'll hit the rev limiter under nitrous and go boom. Nitrous abuses connecting rods much more than turbocharging does, so don't expect your rods to live long under that kind of load.

With nitrous flow being linear, a properly setup progressively-controlled direct port system *could* go higher in HP/torque than 120-150. The key word is linear, and all that it entails.

Just a little combo from my small-block Chevy days that I have in the back of my brain, saving it up for a future time. Maybe one day I'll get around to actually doing it. ;)

Originally posted by SERprise In WV
On stock internals, a 120-150 shot is do-able. However, you will need a controller and a higher-flowing fuel pump. It will be almost uncontrollable without the progressive controller, and you'll hit the rev limiter under nitrous and go boom. Nitrous abuses connecting rods much more than turbocharging does, so don't expect your rods to live long under that kind of load.


Thats pretty subjective - and theres no way you can make that blanket statement. It depends on how much boost you're running. And w/ a simple window switch, theres never a worry of hitting the rev limiter or juicing too early.

I've got my NX wet kit about 1/3 installing (bottle mounted, nitrous line run, etc). I plan on running the 75shot supplied with the kit (working up from the 35 for testing). I've got a fuel pump, and I plan on dropping that in and going 100. I've heard you can go 125 on a single fogger, but the shot gets pretty "fat" in the line, and you really should go direct port. This car is going to get a DET swap, so once I've got the new engine sitting around, i'm juicing this sucker till it explodes. So I'll let u guys know how it turns out :)

I think the most I have seen Andreas run is a 200hp shot of NOS. I know for sure he has run a 150 shot for a while, but he had a second switch for another 50hp shot that came in at 6K. This was also a JWT NOS setup. Chime in Dre if I have it slightly wrong.

Originally posted by jon3k
Thats pretty subjective - and theres no way you can make that blanket statement. It depends on how much boost you're running. And w/ a simple window switch, theres never a worry of hitting the rev limiter or juicing too early.

Sure, there's a way I can make that statement. From experience. My 78hp setup right now is on the verge of being uncontrollable on Nitto drag radials. Yes, both a window switch and/or a progressive controller will help with that. Without either of those, however, and I can tell you that a 100-and-up shot will be all but uncontrollable on a FWD car.

As for connecting rods...anybody who has ever taken apart a nitrous engine will tell you all about what nitrous does to those con rods. The bolts stretch, and the rods, in general, are just beat to death. Nitrous and turbo (boost) are not the same thing. Nitrous is instant torque gain. On, off. Boost is more gradual, and doesn't generate the quick-rising torque numbers that nitrous does. With nitrous, you literally leap up in ft.-lbs. instantly.

The bigger the shot, the fewer gears you can use it in, and the narrower the rpm range for that use will be on a FWD car.

A 140-shot FWD car will not be pleasant on the street, on street tires, in all gears. Period. But what do I know.

Yeah I can also attest to how uncontrolable NOS can be. With the 50shot my tires would just light up in first. Once I got the bottle warmer at 900psi 1st gear is utterly useless. Its just zings straight into the rev limiter in like half a second. Second is usually just a major rolling burnout but if I hit it just righ I can feather it sometimes. This is with 16 inch rubber btw. It's pretty hard to control sometimes, even at the track with real slicks. The car tries to dance all over the place, but it sure is freaking fun :D

Damnit.. I think I'll have to open the bottle on the way home :)

Luis
93 Classic 254k+ 13.3@101.7 JWT 50shot.

there's a low 9 second blazer that has like a 300+ shot on it. gettin new engine put in to run 8's.

Originally posted by SERprise In WV
Sure, there's a way I can make that statement. From experience. My 78hp setup right now is on the verge of being uncontrollable on Nitto drag radials. Yes, both a window switch and/or a progressive controller will help with that. Without either of those, however, and I can tell you that a 100-and-up shot will be all but uncontrollable on a FWD car.


all i'm referring to is the damage induced on the car by either a turbocharger, or nitrous.

Originally posted by SERprise In WV
As for connecting rods...anybody who has ever taken apart a nitrous engine will tell you all about what nitrous does to those con rods. The bolts stretch, and the rods, in general, are just beat to death. Nitrous and turbo (boost) are not the same thing. Nitrous is instant torque gain. On, off. Boost is more gradual, and doesn't generate the quick-rising torque numbers that nitrous does. With nitrous, you literally leap up in ft.-lbs. instantly.


Been there, done that. and i'll tell you right now, a 50shot of nitrous is nothing compared to 30lbs of boost. My nitrous kicks in at a higher rpm than most of these guys are seeing full boost at.
Lets also not forget this amazing new device called a progressive controller.

Originally posted by SERprise In WV
A 140-shot FWD car will not be pleasant on the street, on street tires, in all gears. Period. But what do I know.

Again, I'm not here to argue traction in a nitrous + fwd car.

FWIW...I'll have a highport manifold available for you, jon3k, if you'd like to go the direct-port route. It's already drilled and tapped. :)

It's coming off the car in about 2 weeks. If you want to go past that 100-shot, I'd highly recommend it, btw. Just let me know.

-GP-

I'm very interested! I'll email ya

Originally posted by SERprise In WV
Nitrous abuses connecting rods much more than turbocharging does, so don't expect your rods to live long under that kind of load.

Hey Greg, is this experience from your small-block days?

The reason that I'm asking is that I've read extensive information about how much stronger our connecting rods are than domestic connecting rods. Mike Kojima had a pretty impressive article in SCC comparing the two. Basically, our rods handle much more pressure, are balanced from the factory, and have stronger bolts whereas there is a HUGE aftermarket for domestic rods due to the fact that a little juice or any form of forced induction "snaps them like twigs".

If you're basing this on experience with our rods after getting juiced, then I accept your judgement.