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I used an NOS wet system on an 83 242T with the B21FT engine. Your EFI injectors are 213 cc/min at 43 psi if I remember correctly, which does not leave a margin for much nitrous on a motor that is mildly modified to start with. You would be better off running a wet system, as there is plenty of fuel available from the pump to support all but a very serious system.
I used a single fogger nozzle located about 8 inches before the TB. Obviously, 4 port injectors in the intake runners is better.
Serious nitrous users have ignitions with nitrous retards. MSD and Crane sell these. For a modest system, you should be OK with stock ignition timing and stock plug gap, but maybe use one heat range colder plugs (like a Bosch 6 instead of a 7).
To make a nitrous system really useable, you need a few more parts than the basic $400 or $500 kit. A remote bottle valve will let you open it on the fly; otherwise you have to open the bottle on the days when you want to use it and if you leave it open for weeks at a time, the nitrous generally leaks out. A bottle heater and blanket will help keep pressure consistent so your mix is the same every time. On any system but a real light one, a progressive controller will help hold your motor and trans together. The sudden bang of 80 hp is great but really shocks the trans and engine. I cracked a head, blew a headgasket, and broke an M46. If you have a manual, you may need a stronger clutch depending on how much nitrous you run.
Other great mods are an electric primary fan, an alloy underdrive crank pulley, a steeper rear gear (with a manual you should not go much steeper, but with an auto, you can go maybe two or three steps steeper), a header and larger cat and higherflow exhaust, and a performance cam.
Philip Bradley
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