Took my 91 Z28 to track once last year and went an 11.73, and an 11.61. I lightened it up a little over the winter, and added some gears. Was now thinking about adding a dry nitrous shot to it. ( I want 10's outta my little street car!)..
Talked with NOS tech reps, about dry kit. (Rep stated that a #30 jet= 30hp, #34 jet= 40hp, or a #37 jet= 50hp)... so I was wanting to start out with a 30hp shot to test it, but wanted to know if anyone else had tried this, and had some recommendations? I can tune it with the DFI, to add fuel, remove timing..etc. Engine spec's include-- Vortech charger, AFR heads, TPIS bigmouth intake, headers, DFI, etc..etc...etc...

Any recommendations/warning/ or FYI's are appreciated.


Thanks,

Talon77

Here's a pic of the little rag (top)...

 

generally nitrous + blower is not a good idea, but if your internals are up to the task then you should be fine. i know two diff people running nitrous on their 03 cobras... one is running a 90 shot and is hitting 11.90's if i remember correctly, and the other is running 12.90's on the motor, and 12.3's - 12.4's on a 75 shot (this is in high altitude), both are running the smaller pullies, but i dont know how much boost... seem to be running fine... for now...

i would not use a dry shot however... definately get a wet kit, theres no way i'd wanna go lean under boost with nitrous!
as long as you think your internals are stout enough, you should be fine with like a 100 shot... just do a wet kit, and make it run kinda lean

 

I would opt for the wet kit as well, with the boost their you are just increasing the damage if a lean condition presents itself....

I would start off with a 50 shot to test the ground and after you use it, go back and check to make sure everything is running properly, if so, you may upgrade to the 75 shot

But like mentioned, if the internals in your engine are up for a 100 shot, plus the blower, then by all means get that engine laughing.....

 

that dry shot should work as a nice intercooler... giving you more boost along with more power...


so id expect a lil more gain then 30hp with a 30shot... be sure to err on the rich side as you tune it.

 

The technician at NOS , said that the WET kits (using the plate after the throttle body) typically dont perform well under 100hp shot. From what I gather, the lower horsepower jets dont produce enough flow to evenly distribute between the cylinders, causing some to run lean.
I'm mainly after the dry kit to act as an intercooler + just a little horsepower booster. From what I have read and discussed (again, with the NOS tech line).. the horsepower numbers will nearly double when used in conjunction with a blower...so what may start out as only a 30hp shot, will result in a 50-60hp gain. (at the flywheel).

Thanks for all the tips and advice guys...


Talon77

 

The problem is that a dry shot works by restricting the return, and you end up with whatever pressure the pump stalls (or in some cases the by pass valve opens at) and the volume flow available through the injectors. On a modified car this could be anything, from much more then what you need to much less (if your fuel system is just delivering what the engine is using NA, it is actually possible to end up with less total flow).

I'm not sure that there is an entirely safe way to even test what fuel flow you'd get. With a wet shot you could just trigger it without the bottle valve open and get some idea of the additional fuel flow (engine will bog…), but if you close the bottle valve on a dry shot there is no way for it deliver more fuel. I'd probably set it way rich and hit it for a split second and hope for a bog.

As far as a small wet shot… well, NA they don't work great, but in this case you'll be injecting it into the hot, fast moving air after the compressor which will fix most of the problems that you get with a small wet shot.

 

we ruptured a ATI FMU diaphram running a 5115 with a P600B, it hydraulic'ed the motor and bent a rod.

 

Thanks for the information guys... appreciate the input and suggestions!!

Maybe rethinking the dry nitrous option in favor of a wet system!!
May even go with an aftercooler of some sort... just more $$$$, but probably a safer solution.

Thanks again,


Talon77

 

actually, he said he had DFI in his first post.

that means, he has nitrous functions built right into the ECM.... so he can enrich the mix without even changing the fuel pressure (assuming the injectors are large enough)



if it wasnt for the DFI, id be leery of a dryshot too, but since he has it, go for it...... btw thats why i said TUNE it..

 

I have a wet system to use with my blower. we made a lightnng go 11.30's on a 125 NX shot.

 

i have a lightning blower, a 50shot, more cubes, and alot less weight..... we'll see what i do.