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Guide



If you are new to the world of nitrous and need info, here it is

First and foremost, itís NITROUS NOT NOS! NOS is a brand name.

Look at these links first for definitions of terms and such:

http://www.go-fast.org/z28/new_to_nitrous.html

http://www.gmhightechperformance.com/tech/0211sc_nos


FAQ

Q: What supporting mods do I need?

A: For any amount of nitrous you will need aftermarket intake and cat-back exhaust because the car must be able to breathe. Ever try sprinting 100 yards while only breathing through a straw? Itís hard on your body just like nitrous is on a car that canít breathe.

The next mod you will need is spark plugs, NGK TR6 are the preferred plug of almost all nitrous users. These plugs are a step colder and are gapped at .035[ to prevent detonation. DO NOT RUN STOCK PLUGS!

Q: How big of a shot can I run on my 3.8 Fbody?

A: Most people run a 75-100 shot and havenít had any problems. Our cars will run safely up to an 85 shot with no other supporting mods than what are listed above.

With a dry kit, if you spray more than an 85 shot it is recommended to upgrade the fuel pump with an appropriate Walbro or Racetronix intank unit, or an MSD inline pump. Any more than a 100 dry shot and itís recommended to upgrade the fuel injectors to 36 lbs/hour injectors. You can pick up stock GTP injectors for cheap, but you may need to modify the fuel rail or injector connectors depending on your model year.

With a wet kit you can run up to a 125 shot without fuel mods because you can simply put in a bigger fuel jet to add more fuel.

All in all, 125 seems to be the "safe" limit on the stock internals. Any more than that and forged pistons and rods are a good idea.

Q: What kind of fuel should I run?

A: Minimum of 91 octane or else you will get knock retard at best and predetonation at worst. If there is 93 available, get it. Nitrous motors need high octane to control timing. Do not run 87 octane.

Q: Do I need a tune for nitrous?

A: Tuning is not a necessity; however, it can greatly help your motor maximize the nitrous shot. Itís a rule-of-thumb that for every 50hp of nitrous, that the timing be retarded 2*. Thatís pretty general though. I highly recommend a tune also because the A/F ratio can be correctly adjusted. Too much air and the motor will run lean possibly resulting in a burned up piston. Too much fuel and the motor will run rich which fouls spark plugs and robs horsepower.

Q: Where can I tap for fuel for my wet kit?

A: Two ways: Cut a fuel line coming from the fuel tank and put in Tee fitting.

Or simply take out the schrader valve from the dead end of the fuel rail and put the -4AN line right on it. This valve is located on the passenger side of the fuel rail directly behind the alternator.

Q: Where can I put my bottle?

A: Totally up to you. There are kits specifically for placing it between the backseats and there are also kits to put it in the spare tire area. I have my bottle in the t-top storage area in the trunk. The back hatch is a popular place as well. Some people even remove one of the rear seats and put it back there. Just make sure where ever you put it, it can be correctly oriented for the best flow of nitrous.

Q: Why are window switches so important for manual transmission cars?

A: Because they prevent the motor from hitting the rev limiter while spraying. If the motor hits the rev limiter while spraying, plan on buying a new motor.

Q: If I have an automatic can I spray thru the shifts?

A: Yes, as long as the transmission is in good shape you should be okay. If you have a wet kit with an auto, I personally recommend getting a window switch because you still run the risk of spraying below 3000 rpm, puddling the fuel and backfiring out the intake manifold. I have done this and it was not fun or cheap to fix it.

Q: What is a progressive controller?

A: It is a device that regulates the amount of nitrous/fuel injected into the motor over a certain period of time or a certain rpm range. The main purposes are for traction control and to run larger amounts of nitrous without doing as much damage since the power comes on slower and not one huge shot. Some people will use a progressive controller instead of a 2 stage set up. It is wired to the ground wires of the solenoids and interrupts the signal to control the shot. They range in cost from $125-$800.

Q: Is nitrous safe?

A: Nitrous is safer than most people give it credit for. It gets a bad name from people who have no idea what they are doing, slap on a nitrous kit with no supporting mods, run too big of a shot, and blow the motor then blame the nitrous. Nitrous is just as safe or dangerous as a turbo or supercharger, its just having the right supporting mods to accommodate the requirements of the added power.
You can safeguard your car by using an FPSS, window switch, fuel upgrades (if needed), running the right fuel, a good tune, spraying only at WOT, and only spraying when your nitrous pressure is at 900-1150 psi.

Q: How much do I need to spend to run nitrous safely?

A: That all depends on whether you get new parts or used parts and what brand of parts you get. See links below for prices.

If you wanted to safely run nitrous on your car plan on spending $800-$1500 for parts and $300-$500 for a tune. It all depends on what accessories you choose and the shop who tunes it.

Q: Are there any kits specific to our cars?

A: Well, yes and no. NOS has the 5175 dry kit that is supposed to be specific for our cars, but it can be used on any car if so desired. The only kits that are specific to a certain car are plate kits and direct port kits. Other than that you can use any kit for our cars. If you are unsure if the kit you have or looking to buy will work, post pics of all the parts and we can let you know if it will or will not.

Q: I have over 100,000 miles on my car, can I still use nitrous?

A: That depends on the condition of the car. If the car has been babied and well maintained then it should be fine. But remember if there is any kind of flaw anywhere in the motor, nitrous will exploit it. The transmission and the rear-end must also have been taken good care of because nitrous can do damage to them as well. Essentially what it boils down to is that you have higher risk of a failure on a higher mileage car.

Q: Is nitrous legal?

A: That all depends on the state in which you live. Check your local state/county/city laws to make sure it is legal or not. In many states even if itís illegal, itís only a secondary offense. It is usually not legal to spray on the street. Some states require that arming switches not be located where the system can be turned on whilst driving down the road.

Install tips:

Read the directions that came with your kit. If your kit does not come with instructions, contact the manufacturer and ask for them. I have yet to run across a nitrous manufacturer who didnít have install instructions for their kits.

The best thing to do BEFORE installing your system and all the accessories is to look at your car and choose where you want to: a) mount the bottle, b) where you want to mount the solenoids and c) where you want to mount the switches. Knowing all of that will greatly help you set everything up.

Once you figure all that out, install the basic system with no accessories and once its in place and working, then install the accessories. If you have a problem and something doesnít work then itís easier to diagnose the problem by installing everything one item at a time. If everything is installed all at once and something isnít working right, then itís a real pain to figure out what is wrong and where itís wrong.

When you order all these things and you take them out of the box, you will have a huge mess of wires. Donít worry. Take your time, install one thing at a time, and itís not bad at all. The only electronics install experience I had before working my car was installing a CD player. But I learned along the way and it wasnít as bad I thought it was going to be. Moral of the story, I had no idea working with electronics and I survived my install. The directions for all of this stuff are pretty clear and simple to read. If you have questions, just ask.

Here is a link to ColdFusion's website. They have tons of install videos that are EXTREMELY helpful. They are not specific to our cars but they can give you a good idea of what to do:

http://www.coldfusionnitrous.com/dvd/index.htm (link at the bottom of the page)

Additionally you can contact FloydSummerOf68 who is a ColdFusion distributor.

Useful links

http://www.harrisspeedworks.com/shop/home.php
http://www.dynotunenitrous.com/store/scripts/default.asp
http://www.nitrousoutlet.com/
http://www.holley.com/index.asp?division=NOS
http://www.zex.com/
http://www.nitrousexpress.com/Pages/Home.htm
http://www.edelbrock.com/automotive/nitrous.html

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