learn me nitrous. future p71.

my main question is the difference between a wet and dry system. and what would be the biggest shot to put on stock internals.. my plan is to get a p71 next year as a DD and do some small hop ups to it.

thanks chris b

I don't know squat about N20, but I like where this is going.

No expert here, but from what I know a wet system will allow for LOT more power. Not sure how a dry shot doesn't lean/burn up a motor.

I would be interested in an honest real world assessment of the true value / use of nitrous. You hear a lot about it, but not a lot of real world long term results.

I suspect an issue with it is that it does not last long so it really is only good for a drag race or two. Also, I think now days it is a crutch, and you are far better off (if you can afford it) to just build a good boosted motor.

Nitrous is lots of fun. Be sure to get 1-2 heat ranges colder plugs for when you know you're gonna hit it. You're probably going to also want a custom tune to pull timing and all that good stuff.

Dry shot means just nitrous is injected. Usually only available up to about a 75 shot.

Wet shot means nitrous & fuel are injected. Nitrous Express offers a kit for the Mustang/Crown Vic that's a direct port kit that installs under the intake manifold that's tuneable up to like 250 hp shot. Pretty nice system and is pretty plug and play from what I've seen. A nice fogger plate system is also available for behind the throttle body or under the intake plenum/elbow.

For the P71, I'd probably only go 100-125 shot on the nitrous and DEFINITELY a wet system. I was seriously thinking of doing this on my 5.4 P71, but decided against it because I ain't got the extra cash. LOL

I also agree with what mndsm said, I like where this is going...

P71=4.6 2v that cracks and chips off ringlands during NA events. Don't do it.

As for wet vs dry, it is just how the fuel is supplied. Wet systems have the fuel supplied via a separate fuel "event", while the dry system clamps off the return line to raise the FP to get the fuel to flow through the original injectors.

Rich mixtures are good, but kills power. Lean is mean, but you will be on the razor edge of detonation and destruction.

Conquest351 wrote: ...For the P71, I'd probably only go 100-125 shot on the nitrous and DEFINITELY a wet system....

How much "bottle time" would you expect out of such a system?

10 seconds? 30 seconds? 2 min?

I think nitrous systems should be required in all challenge cars...

Ranger50 is also correct. I've seen 2v 4.6's with entire ring lands broken off running NA for 90k miles. Nitrous may just help that damage along.

If you decide you want to run a Nitrous engine, Forged pistons are your friends. Hypereutectic pistons will break like a china plate with nitrous harmonics. Seen it before, not pretty. Maybe a little 75 shot would be better on the ol' P71 unless you wanna drop a Forged shortblock in her. If you're spending the money to do that, might as well boost it. LOL

I owned a nitrous system when I owned the P71. The numerous (hundreds, literally) of "BANG!!!" stories on the internet, and witnessed at the track in real life, of 4.6's on nitrous made me sell it before even thinking of installing it.

They spit spark plugs out of the head, stretch and break chains, and chip off ring lands stock. You do not want to add the extra pressure, heat, and HP of a nitrous get-up on that...

All that said, the others above are correct. A dry shot relies on the car's stock fuel system to provide the extra fuel. Many cars are not capable of doing this, but the P71 is. A 75-100 shot is the max though (dry). A wet system will have it's own dedicated fuel nozzles and usually comes with (or requires) a larger or second pump, etc, etc.

aircooled wrote:

Conquest351 wrote: ...For the P71, I'd probably only go 100-125 shot on the nitrous and DEFINITELY a wet system....

How much "bottle time" would you expect out of such a system? 10 seconds? 30 seconds? 2 min? I think nitrous systems should be required in all challenge cars...

I've never run a car full on nitrous for an extended period of time. Only short races (drag racing, street racing). A friend of mine sprayed his car wide open for 9 miles and still had bottle left for racing later that night. His was a 250 shot on a carb'd SBC.

Conquest351 wrote: ...A friend of mine sprayed his car wide open for 9 miles and still had bottle left for racing later that night. His was a 250 shot on a carb'd SBC.

Exactly how fast was this guy travelling after (what I am guessing is) around 500hp of full throttle for 9 miles!!!!

my thought or thoughts when i get one is gears, some type of cold air intake. spray, and an exhaust system..

In reply to BARNCA:

I did a tune, a cat-back exhaust, a CAI, and a J-Mod and was faster than both 5.4-swapped ones on this board. I'd think gears and headers (MUCH easier on an 03+) would have really woken it up nicely.

Javelin wrote: In reply to BARNCA: I did a tune, a cat-back exhaust, a CAI, and a J-Mod and was faster than both 5.4-swapped ones on this board. I'd think gears and headers (MUCH easier on an 03+) would have really woken it up nicely.

jmod?

aircooled wrote:

Conquest351 wrote: ...For the P71, I'd probably only go 100-125 shot on the nitrous and DEFINITELY a wet system....

How much "bottle time" would you expect out of such a system? 10 seconds? 30 seconds? 2 min? I think nitrous systems should be required in all challenge cars...

Nitrous Oxide Systems says no more than 15 secs with nitrous. Longer than that and bad things start happening.

We ran a ZEX "dry" kit on our first challenge car. I berkeleying love that car. With a little trial and error, CONSTANTLY checking the plugs, and eventually a few dyno runs with a wideband sniffer, we got that berkeleyer dialed in. The ZEX kit basically slams the door on the fuel return when the system is armed and WOT.

I daily drove it with nitrous for a few months. It was a blast. Install a wideband and A/F gauge. That motor had 180,000 miles on it, and has probably had 100 1/4 mile passes. I think the rings are getting weak, but no catastrophic failure.

A bottle doesn't last long, but a warmer will help. Maybe 20 or so drag passes? You want the pressure above 1,000 PSI. Ice down the bottle on the way to fill it, and carry that berkeleyer like a baby when it's full.

Don't return a bottle that's not totally empty. You can always empty said bottle while listening to Zeppelin on the basement couch.

I just realized, I filled my 15 pound bottle in 03 and it's still over 1000 psi. I need to find something to spray.

When I was building my home made system out of used NOS brand parts, I called them for some tech help. When they heard it was going on a (basically) 3 cylinder Metro engine, they tried really hard to discourage me.

FYI, when you're setting up your west system, DON'T get the jets backwards.

I saw a mostly otherwise stock mustang on slicks crack off something like a 12.8 in the 1/4 at like 115mph with 2 heat range colder plugs and a 150 dry shot. Apparently nx told him he could do it, and it held together for at least the two runs I saw.