Who is running dry shot nitrous? Curious about it

[1991 Corvette ZR-1]

I wanted to see about those running dry shots what your set up looked like, where you mounted your solenoid and your line routing. This is not a definite for me, just in the research / curiosity stage but let?s say I am staring at a pile of nitrous parts and wondering about another project.

What I have:

10lb Zex bottle with pressure gauge
lines
nitrous filter
solenoids
pills
evacuation tube and hose to outside of vehicle
Mini switch panel for arm, heater, opener and purge from C7
wiring and relays

Off the top of my head what I would still need:
Fogger nozzle not sure which brand, I guess Zex
bottle opener - Zex brand? not needed but I have a switch
WOT switch - brand unsure
Window switch - brand unsure

With this small of a dry shot, would a heater even be necessary? If so, what is a good safety switch to pair with it to prevent overheating? Also, where is the best nozzle placement? The factory accordion duct would have to be replaced for this. Post pics if you have them of your set up, I wouldn?t mind learning a thing or two. My secondaries are eliminated but throttle shafts are still in place and held in open position with brackets.

We all know about the now way defunct NOS kit custom made for ZR-1s, I guess it would be nice to piece a kit together of decent parts that replicates the built in safety of that old kit. 50 shot was the target?maybe 75 max and I am done if I go through with it.

Ported top end, stock heads minus secondaries, headers, exhaust, aluminum flywheel and 3.90 gears are what I have.

[rkreigh]

not too many nitrous warriors on the lt5 there was a nice safe NOS dry kit and other more aggressive direct port stuff that Julio and Kurt did on some 415s. Lots of wounded warriors and not too many folks has the fold to keep refreshing the high end engines.

Nitrous warehouse did some cool nozzles that would fit under the injectors that looked really cool as you could run stages and it made sure the nos and fuel went right down the port.

[Karl]

Usually if you Google the topic with zr1.net afterwards you will find some good information here

http://www.zr1.net/forum/showthread.php?t=25970

Good luck with your decision.

If replacing an LT5 was the same cost as an LS I would be spraying also.

I chose to stay naturally aspired.

FWIW a friend of mine was racing a turbo BMW in the later 90s or such and had a nitrous backfire.

Blew the plenum through the hood of the ZR-1 and destroy the motor.

[CamP]

I had a NOS dry kit back about 20 years ago and it worked very well. Made about 460rwhp and over 500rwtq on a bone stock ZR-1. Ran 11.74 @ 124mph in the 1/4.

The key to the system was the NOS relay that prevented the system from triggering until the secondaries were activated. Sold it to someone in Sweden, but I should have kept it.

[tccrab]

You will notice that Nitrous is not discussed much here.
There's a pretty good reason why.
High compression and nitrous don't play well.
One little hiccup and you will be replacing your LT5.
If you're rich and don't learn fast, give it a shot or two.
But just don't make it a habit.
You have been forewarned.

Crabs

[1991 Corvette ZR-1]

Good takeaways on this subject. Karl, I reviewed that thread prior to making this one. Lgaff has quite the talent for making things work on these LT5s. I was impressed by him jumping in with the wet shot. Is pooling in the intake still an issue with small dry shots? I understood this to be a primary concern with wet shots but WOT with a small dry shot would still allow this?

[CamP]

Originally Posted by tccrab

You will notice that Nitrous is not discussed much here.
There's a pretty good reason why.
High compression and nitrous don't play well.
One little hiccup and you will be replacing your LT5.
If you're rich and don't learn fast, give it a shot or two.
But just don't make it a habit.
You have been forewarned.

Crabs

I ran over 1,000 pounds of nitrous through my engine, before I had a brain fart and burned a $15 exhaust valve. It was self inflicted. The rest of the engine components looked good. If done properly, a modest shot won't hurt anything.

The biggest issue I see is the price of nitrous has gone up 600%+ since I was using it.

[CamP]

I learned something from Graham a few months ago that probably would have prevented my burned valve. He said that disconnecting the MAT sensor results in a few degrees of timing retard. I'm pretty sure I never would have burned that valve had I known that in 2004.

[CamP]

Originally Posted by 1991 Corvette ZR-1

Is pooling in the intake still an issue with small dry shots? I understood this to be a primary concern with wet shots but WOT with a small dry shot would still allow this?

No fuel puddling with a dry system.

[1991 Corvette ZR-1]

Originally Posted by CamP

No fuel puddling with a dry system.

That was my understanding. Liquid in the bottle, gas while decompressing to reach atmosphere pressure, impossible to puddle. I am sure the opportunity for a plenum backfire is probably still a thing even with a dry shot. My understanding is the nitrous is an oxidizer and therefore not explosive or combustible but aides in the combustion process. Have people popped their plenums on dry shots? If so, I am picturing them doing do on the ragged edge of what you should using for dry versus using a wet system.