local performance shop suggest that i use a dry kit for my lt1...plan on 100 shot mostly occasionally 125...if i go dry is there any premaid kits that a good? i kno alota people like the single nozzel kit for wet...how do u do a dry system anyways? do u have to program the computer to throw in more gas at full throttle...i jus dont understand how u can send in more fuel with and switch and have it be the correct amount?
some info please
thanks
daniel

 

The guys Like Harris & Dave can give you more complete answers but the SHORT version is that for a relatively small shot, like 100 or less; the Dry LT1 kits such as the Zex kit are a good way to go. They use the cars existing fuel system and injectors to add the enriching fuel.

The catch is that unless you already have an aftermarket pump like the Walbro 255 and new injectors (preferably slightly larger ones), then you need to buy those things.

 

Daniel,
Either a wet or dry system will work for what you are wanting to do.I personaly prefer the wet system.You will gaim better torque creating better performance gains.However if you like dry we offer the ZEx and the NOS dry.
Let me know if I can help.
Thanks
Dave

 

The NOS dry kit (5176) supplies more fuel through the stock injectors by increasing the fuel pressure when you spray. There are 2 nitrous solenoids in series, with bleed stream in between them. The bleed stream passes though a blue pressure regulator (originally used for CO2 systems) and drops to about 90 psi. That pressure it applied to the vacuum compensation port on your stock fel pressure regulator to boost the pressure.

NOS provides a crude way to adjust the fuel pressure rise, to match your HP selection on the nitrous jets. They put a "jet" in the tee at the fuel pressure vacuum compensation line that bleeds off some of the nitrous slipstream pressure, and limit the increase in the fuel pressure.

As a result of the need for higher fuel pressure when you spray (85-90psi for the max shot) you need to change out the injectors. The stock RP ball/seat injectors are not happy with 85psi and can lock up, causing you a serious problem. The pintle style injectors (Bosch, Denso, FMS, SVO, etc.) will live better with the elevated fuel pressure, so those are a good alternative.

In essence, you keep your stock injector size, and use the nitrous pressure (via the CO2 pressure regulator) to bump the fuel pressure up and supply the extra fuel required by the nitrous.

Many of us have succesfully used the NOS 5176 system. I used it for about 5 years before doing the stroker and moving up to a custom 300HP dry system using an aftermarket engine management system. Dry ain't as bad as some people would have you believe......

 

I converted a dry NOS brand kit to a wet kit for my car and assembled the fuel side of the system myself.

 

If you're looking for suggestions I would suggest a wet kit also. The main reason I suggest them is that a dry kit can be taken only so far before other supporting components need to be upgraded (like fuel injectors). The dry kits are a bit cheaper then the wet ones, but usually (but not always) over the long run they do end up costing more then if you just went with a wet kit.

Matt