Nos Kits

[Deano 1]

just do it mate, and post some pics,

[XRATED]

Honestly if he wants to do it, do it. Just make sure you do enough research and understand everything. Don't listen to people that have never had any experience with it and are just saying what they have heard from a friends, counsins brother. Nitrous is one of the most missunderstood modifications and it's mainly human choices and errors that give it such a bad name. (And Fast and Furious )

Alot of people who have had experience, don't fully understand nitrous either! Couple lack of knowledge/experience with rubbish nitrous products and it's usually a recipe for disaster or disapaointment...

There are a couple of guys in the UK running nitrous an NA rb25's...

2rismo is running gas on his 25/30 and previous 25.

[SKiT_R31]

Nitrous is great, and its no where near as sketchy as people think, as people above has said, just do it right. All you are doing is adding more oxygen to your engine, its similar to boosting your engine (aka adding more oxygen by means of adding more air). Otherwise if you go for a 100hp shot, without having fuel properly set up, ignition timing a appropriate level etc, its just like bolting a turbo onto your car and running 10psi, you damage your engine, due to the incredibly fast combustion, causing excessive heat and pressure.

Also, don't under estimate nos, 50hp isn't 50hp of gain, its 50hp worth of oxygen burnt at a 12:1 ratio. Due to efficiency bonuses etc, that can be up around a 50RWKW gain. If you use a tame amount, you wont have to drive your car around with retarded timing, and you wont have to go spastic on supporting mods, plus it will last twice as long. A 10LB bottle on 50hp will last about 3 minutes before its too low on pressure to be usable, but don't forget, in a drag, you are probably only flat to the floor for a few seconds (when in the power range, not shifting etc) if dragging illegally at the lights, it might only be like 3 seconds of use, down the 1/4 mile, maybe ~ 12seconds of use. That's 60 street drags, or 15 drag runs, at 50hp (estimate around 150kW at the wheel with good flowing exhaust on an RB25DE)

With nitrous, get some colder range spark plugs (maybe 7's or 8's if you have good coil packs/don't mind a miss at idle) and set your timing to factory specs. A free flowing exhaust is also a good option, and run the best fuel you can combined with the right rev restrictions etc. Any more than 50-60hp and in my opinion a good option would be some sort of piggy back computer, maybe emanage ultimate? Simply because if you want the car to be fully drivable, not all sluggy and uneconomical with the timing retarded, that way you could control the nitrous with the aftermarket management, as well as have it tuned for with the nitrous - for appropriate timing and fuel maps when in use.

I'll be heading back in the nitrous direction (for legal use...) when i get bored of my R33 RB25DE+T, and get my other skyline back on the road. I was thinking my new daily could be a BMW 540iLE (6 speed manual, 210kW 4L V8) an exhaust and 75hp shot does wonders, brings that engine up to around 300hp at the treads (225RWkW) when in the mood for a bit of a squirt (I'm generally quite sedate and like to chug along, which is why I'm not too happy with the r33 as a daily).

Edited March 25, 2010 by SKiT_R31

[noely1]

wow thank you tahts a great write up you jus provided!!!

when you say 100shot would need mods what kind of mods is my friend looking at? you said fuel upgrades (what would they be etc) cause the kit he was looking at was a 100shot.. and the shop said his skyline would run a 75-100 shot easily..

cheers again for tha info man!

[PM-R33]

Fuel pump definetely and possibly injectors. (as i said earlier, no idea what flow the NA fuel systems can support)

Edited March 25, 2010 by PM-R33

[SKiT_R31]

Definitely fuel pump, as for injectors on N/A management I'm not sure. Due to the extra efficiency from nitrous, it could push your equivalent power (if it were N/A excluding the power purely from the extra oxygen/fuel mix in the case of a wet shot) it might push your stock power past what the ECU is capable of. I'm not really too familiar with R34's but R33's are 270cc which wouldn’t be a problem, it would handle it fine. It’s just what the ECU decides to do when making the extra power, it could richen right up - could simply R&R or worse it could lean out. You said you would get it on the dyno, so you'd be able to monitor all that anyway, so i wouldn’t be too concerned.

If you wanted it on the cheap (i.e. without aftermarket management assistance), just retard the timing and fit some colder spark plugs, it will cope with it fine, it’s just the drivability without nitrous that will be effected. This might not be an issue for your mate, if so then just go for it like that, but you might be able to get some drivability back with more ignition timing by making other changes.

You could fit the engine with a cooler thermostat from an R33, and modify the coolant temp sensor in some way (maybe add a resistor, so it reads the same resistance at 76degree's as it did at ~ 82-83 or whatever neo's are stock) this would make your engine run cooler but drive the same (without cold start enrichment and bad economy). The point of this, just as the colder plugs (which you should fit as cold as practical, NGK 8's/9's) is to cool the engine & combustion chamber down as much as possible, to slow the combustion process. Much the same as retarding the timing slows the combustion process by moving ignition further from top dead centre for lower initial combustion pressures (therefore slower combustion, as it’s almost like having less compression) and of course lastly, you could just run a high octane pump fuel (do you guys have 100ron up there?) or a fuel additive such as 10-20% toluene (could get expensive if the car is driven frequently).

Some of these changes will help with power (without nitrous) as an alternative to retarded timing, but you'd definitely be better off with some form of aftermarket management or assistance - especially considering it could actually net you more power both with and without nos.

[KezR33]

Pretty interesting read.

I guess I fell for the FnF myth that NOS = a button on the steering wheel, and once you press it you use your entire NOS tank, not something that you can use in controlled doses with the WOT.

[XRATED]

This thread is the perfect example of people not full understanding how to correctly set up, install and/or use nitrous oxide.

As I said before, check out:http://forum.nitrous-advice.org/

The wizard of nos forum is the best resource for nitrous info... Read as many threads as you can and buy the book, it's a good read.

PS. You won't need to change the injectors, ecu or base timing if you do it right and dont get greedy... You will need to upgrade the fuel pump as a precaution.

Nitrous/fuel injector/s placment is more important on a N/A application, as compared to a boosted application. So don't look too hard at turbo nitrous RB set ups.

Cheers

Justin