NITROUS help!

[ZZZZZZ]

I am considering putting nitrous on my cobra to increase the power. I am trying to increase my knowledge on it. I would like to here recommendations for what type of system "fogger, plate etc. and if my motor will handle a 150 horsepower shoot. What will my motor need to keep it from melting. The motor was professionally built, balanced, decked etc. all wth arp bolts and studs. Has around 2500 miles on it.

- I have a 428 with edelboock performer rpm heads
- Harlan sharp roller tip rockers 1.76 with hardened shafts and end supports
- comp solid cam with 605 lift
- trw forged pistons around 10.3 to 1 compression
- cobra jet crank with cobra jet rods
- edelbrock performer rpm intake
- edelbrock 750 carb
- edelbrock manual fuel pump
- edelbrock water pump

5 speed and 4:11's in rear

[Cracker]

You might try _ _ _ _ _ _ _ _ _ _ - I heard they add nitrous to their motors when dynoeing. JUST KIDDING of course but I would also like some info on the subject if anyone knows about it. I have a 4-cyl. in need of extra go-power!

[ZZZZZZ]

LoL

[Mr.Fixit]

Your motor sounds fine to accept a 150 hp shot of N20.(pistons crank, rods, fasteners all sound good) You will need to increase your fuel delivery however, you DO NOT WANT to have a fuel pressured drop when you are on the bottle. With that dual plane intake, a carb plate type sprayer is not preferred, individual nozzles in each runner are better. Hope you have a rev limiter and good ignition, if not get an MSD 6-AL or similar.

[HighPlainsDrifter]

Hi,
NOS is reliable if you do a couple of things.

- for 150 HP shot you need to retard your ignition 4 to 6 degrees
have an msd retard wired to the nos activation solinoid.

- Do NOT use the NOS under 3,000 rpm, use a rpm switch in series with a wide open throttle switch to turn on the nitros.

- a plate system is fine for street use.

- Nitros will rev the engine quicker, use a REV LIMITER !

- with 4:11 gears you will be all over the road if you use it in 1st or 2nd gear, recomend only using it in 3rd or 4th aand ONLY if your pointed straight !

Good Luck,
Perry.

[Nuke427]

My $.02

Nitrous is good safe horsepower if used correctly. I've recently added it to my BDR. All suggestions above are very good, like not using a plate with dual plane and not using nitrous at low rpm. But other items to consider are what more do you need besides the basic kit?

You must have a purge system. You must have a bottle heater that operates on pressure and a pressure gauge (Very important to have ~950 psi N2O pressure). You must use a WOT switch even with an rpm activation switch. If this is going into the Cobra and bottle in the trunk (where it should be) you will want a remote bottle opener.

Also after you have installed it, you will want to dyno the car with a wide band O2 sensor to ensure it is not too lean or too rich. Even using the correct 100 hp jets (N2O and fuel) you may run into a rich or lean condition and need to use the 100 N2O jet with the 75 fuel jet or vice versa. (All fuel pressures are not the same on every car)

Since I've installed my system, I've yet to test it b/c I swapped from a dual plane intake to a single plane. (Air gap to Victor) After doing this the car ran so lean it was horrible. I was never able to test the system. But without even testing it I have installed a plate system with bottle heater/and blanket, purge solenoid, pressure gauge, and remote opener. The remote opener is great, I recommend it to anyone mounting the bottle in the trunk. It's worth it, and get the NX because it actually opens and closes the bottle, not a solenoid off the discharge of the bottle.
My car also has a 6AL ingnition with a 7K limiter module. I probably have well over $1,000 in this system and my max jetting would be 100 RWHP.
My brother and I have been into using nitrous for quite awhile and have not had any issues as long as we ensure we use it correctly. Too many teenager stories of blowing up their Civics keep people away from it.

[ZZZZZZ]

What is wrong with using the plate system? How would I know were to put individual nozzles.

[HighPlainsDrifter]

Hi,
The plate systems are good for the lower HP NOS systems. Once you start running lots of NOS you should step up to a fogger system with bigger solenoids and dedicated fuel system.

Look at the Edelbrock website and they will tell you to use their plate system with a dual plane intake for best performance on the street. An open plane intake is not a good choice for the street. Also on the old 302 and 460 firing order the # 7 and 8 cylinders fire right after eachother and cause a LEAN condition in cylinder 8 when using an open plane manifold.
Perry.

[MJN]

Although a 150HP charge on an engine as big as yours should not be a problem make sure to be a little conservative on the ignition timing. If you can find one at a good price get a mallory high speed retard box and wire it into the microswitch for the nitrous so that you can pull a few degrees of timing when the nitrous kicks in.

[Nuke427]

Originally posted by ZZZZZZ


What is wrong with using the plate system? How would I know were to put individual nozzles.

My opinion on the plate system on a dual plane intake is the spray bar on the nitrous plate may sit right on top of the divider wall on the intake. Maybe my assumption is incorrect. I guess if the divider plate was dropped like on some intakes, it wouldn't be an issue.

[rlearp]

If you do go the nitrous route check out ZEX - I've found their systems beat the hell out of NOS (guys NOS is a trademark, not N2O) Just my opinion of course, but if you take a look I think you'll agree.