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Honestly, the best way to do it is to build the kit yourself off E-bay or something. Do some research, figure out what you want to do, and buy the parts individually from a wholesaler or E-bay.
An extremely nice set-up can be done for less than $500, if you know what you are looking for.
Invest some time at a local Barnes & Noble and buy a few books on the subject. Become familiar with the fuel system requirements of nitrous. Nitrous without additional fuel can lead to holes in your pistons and your wallet.
Although more expensive, the progressive nitrous system is designed to work very well with fuel injected engines. Instead of a single shot at WOT, when a progressive system is enabled it begins metering additional fuel and nitrous at a specified engine speed (say 3,000 rpm) and increases metering with engine speed. You’ll have more power sooner and better ¼ mile results. Because progressive nitrous does not slam the power on at WOT, your Corvette’s drivetrain should last longer.
Sonny’s Racing in Lynchburg, VA has been building IHRA Pro/Modified nitrous engines for years. Once you’re more familiar with the concepts and hardware involved, give them a call and ask for a recommendation within your budget. Plan to spend more as time goes on – this stuff is addictive.
do a google for DIY nitruous, I just found this site that belongs to some guy in the uk. He dous a good job of explaining it. sorry, i forgot the site. I am in the same boat as you, I will be building my own system.
I swear by a wet nitrous system, which is a nitrous and fuel spray. If you don't want to get exotic, you can run up to 150-shot off the stock fuel rail. The nozzle should be 2-6-inches from the throttle body for a single nozzle system.
I run Nitrous Express in my ZR1 (will be direct port in a few weeks) with an electronic Wide Open Throttle Switch, RPM Window Switch, and fuel pressure cut off. I also run an independent fuel system so I can regulate the fuel pressure (about 12psi), and a bottle heater on a 15lb bottle. Other good systems IMHO is Nitrous Works and Texas Nitrous Technologies (TNT). If I were to choose for you, I'd go Nitrous Express.
Peace mealing your system will save you a couple bucks, but I would aviod mixing and matching different components.
Go do a search engine on Nitrous Oxide, and browse the different Manufacturers websites. In about a day or two you'll have a pretty good understanding of how nitrous works.
Newbie to N2O - If you are familiar with Breathless Performance Products, The owner - Ernie Francis, was running "Juice" on his C5. He removed the system to bolt on a supercharger (F-SC-1 PROCHARGER) then later removed the supecharger and installed a twin turbo for over 1,000 HP.
FOLLOW THE LINK IN MY SIGNATURE & CHECK OUT MY N20 MOTOR!
Long story made short, I'm the new owner of his "old" nitrous kit. It has been modified with several different components from several different manufacturers. I was told one of the most important things in the system is to make sure you have heavy-duty & reliable solenoids. Purge kits are helpful as well as a few precautionary items - such as Wide Open Throttle switch and rev limiters. As with any performance enhancement, make sure your motor & drivetrain can handle the extra power, as a 1986 vette probable has some realworld mileage on it (I'm assuming). I'm running "Juice" on my '87 which is turning 200,000 miles... but the motor and tranny were professionally rebuilt. The tranny was working great under normal and "slightly abusive" conditions, but when I hit the juice at the track the tranny would slip a little, thus a rebuild. The rebuild is fantastic! Added a 2200 converter and Transgo shift kit... huge difference! But now I can't get off the line with street tires. If you're looking for economy N20, buy a used kit and replace the solenoids. Do lots of "homework & research" it'll save you time & money in the long run! Just my 2 cents...