[Glacial]

Anyone out there using N2O with the 968? Any experiences/stories/recommendations?

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[Greimann]

Would this be for the car or the driver? <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />

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[PcarFan]

You wont get a serious reply out of these guys. This is definitely not the car to put Nitrous in.. and I have never seen a 968 car with Nitrous, but if you plan on it then goodluck and give us results after its finished

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[BruceWard]

There is a guy on Rennlist who is using nitrous with a S2.



Personally I think nitrous is much more suited to Civics or other cars where you can replace the engine for $500.

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[jfrahm]

I have run it on a few cars and if the system is installed properly and used with good common sense I think it would be fine. A possible exception might be the 1992 rod issue, which some say is more of an RPM-caused problem but I wonder if it's more of a detonation problem actually? Hard to say.

The good thing about nitrous is how it cools the intake so much and prevents detonation, provided you fuel system is up to the task.

The bad thing is that you have fun with a 75 shot and then you want a 100 or 150 shot.

It is expensive to use and annoying to have to have a full bottle ready and open, system purged, bottle warm, etc. You would have to invest in some extra hardware if you wanted to decide on a moments notice to use the system to pass a slow-moving semi on a steep hill or something.

IMO a key part of the system is a cockpit fuel pressure gauge and a low fuel pressure safety cutout. If your fuel pump dies or your fuel filter gets plugged up while you are on the juice you can melt down your block.

I would suggest a $500 car to learn the ropes with this stuff. It's great fun and kits are easy to augment and migrate. Get a friend, split the cost of an old Buick Century or something, and go wild. My friends and I installed a system on a beat up 97 Malibu in about two hours and it went like stink.

-Joel.

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[flash]

yeah - nitrous can indeed be fun - i've played with a few cars with it over the years - blown up a few too - they have gotten a lot better at the interfaces and controls, but the physics is still what it is

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[jfrahm]

The physics is what is great about it. The phase change cools the intake charge and the head so much you can get away with murder. I have not managed to blow up a motor with N2O but we always did the smart things with fuel flow/pressure and also ran pig rich under spray and dialed it back rather than run lean and try to dial it rich before melting something.

I would think nothing of putting a dry 75 shot on a stock 968, as the fuel system can handle 100 more crank HP (as per the supercharged cars) it should be fine. You would be wise to use an RPM window switch and of course the fuel pressure safety. Hitting the rev limiter under spray can be bad news, as can spraying at low RPM. I would suggest not even spraying in first as things happen way too fast.

Again, even better to find a $500 car to learn on. I did the same thing with turbo tuning, picked up a Saab 900T for less than the cost of a turbocharger for my 951 and got quite an education, even sold it on for only $300 less than I paid.

-Joel.

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[flash]

when i mentioned the physics, it was not related to the combustion aspect - it was more the mechanics of making it work - it was the fitment, storage, access, operation, and the above mentioned temperature preparation issues that i find to be the hardest to get around

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[Cloud9...68]

Flash's upcoming supercharger should eliminate this as an issue in the 968, but I would think the best use for nitrous would be on an engine tuned for top-end power,or a turbo motor with lots of lag. The nitrous could be injected just for a short burst to "fill in" spots in the power band where things are lacking. I would think this would be just the ticket on, say, a turbocharged track car producing about 500 peak hp on racing gas. Just inject a squirt of nitrous the moment you apply assertive throttle coming out of a turn, and let it ramp quickly to zero as the boost comes on.

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[jfrahm]

N2O is great on boosted motors as you get synergy from the charge cooling working with the hot, compressed air. You usually get more HP out than you 'inject' with the N2O when you do so on a boosted motor. Supercharger charge air temps are going to be well north of 100 degrees, 200 in some cases. Even with intercooling you are breathing very hot air but the N2O cures that easily.

However an engine designed to be tough to live with when you aren't spraying would not be fun to own.

I am more interested in supercharging with some water / methanol injection these days. I did a lot of work with water injection on boosted cars in the past with great results.

-Joel.

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