NZConvertible

If your engine is detonating something is wrong!
The usual causes of detonation are poor fuel, not enough fuel, too much boost, too much ignition advance or high intake temps. These are all easily fixed problems. If your car is stock or mildly modded, something is wrong and needs to be diagnosed and fixed. If it’s very worked you’ve probably just gone too far.
Throwing nitrous at an engine to cure detonation is the craziest thing I’ve ever heard...

Skippydog

No doubt never heard of that. An expensive fix i must add seeing how you would need a constant mist to even be affective and even with that. Work? Maybe but i guess I wouldnt be that experimental.

sinfestboy

It might not be right for your application.

well, all that causes detonation is the temperature rising past a certain temperature (depending on octane) during the compression stroke, or at the verrrrry beginning of the power stroke. the Nitrous would help no matter what.
if the fuel is bad, then the nitrous cools the air, and (most likely) cools it enough to slip under the temperature limit of that octane fuel.
If you have too much boost, when it compresses the air in the compression stroke, all that happens is the temperatures rise too high, and of course, notrous helps that, because it lowers the temperature of the intake charge
If the intake charge is too hot, its the same thing as having too much boost.

When you compress air, it raises its temperature, no matter what. weather it be from a turbos compressor, or the compressor stroke. Nitrous lowers the temperature, and therefore helps the problem of detonation, no matter whats the base source of the problem.

It may be crazy, but ya know what, I think its just crazy enough to work.

RestoTII

The NOS idea is a great one... I mean for a 120 mile trip, I'd only need what.... 300 lbs of nitrous?
Seriously though, something stupid must've happened cause it's never done that. I've got full RB exhaust and FCD. No advance in timing. Only thing I can think of would be bad gas. I thought I got 93... apparently is was a little watery or something. But in any case, it's got some symptoms that i don't think i'm gonna be able to fix, and the car's pissed me off alot, so I might be in the market for a new car and looking to sell this one.

hypntyz7

Call me crazy, but the NOS idea is not a great one. Granted, NOS greatly reduces intake temps. But, it also raises combustion pressure and intake charge...its like really cold, dense air. As we all know, air requires fuel, so NOS is similar to boost in this regard. Ever hear of boost creep, like its a bad thing? ITs somethig that happens due to a poor wastegate and in cold weather, when the air is naturally colder and denser, requiring more fuel that doesnt always get added. Too much boost with not enough fuel kills engines, just like NOS without enough fuel would. Now, you apparently have a problem in the system already...this would only make it WORSE. I agree strongly with NZConvertible...find the problem. Your car isnt highly modified so something is not right.

FoXX

mark original position of CAS and then retard the timing by turning it anti-clockwise, a few millameters at a time.

rev the living **** out of it.. if it still knocks.. then dont look at me!

NZConvertible

Detonation is a sign that something is wrong. Retarding the ignition form stock will merely mask the problem at the expense of performance. Find the cause!

RestoTII

I'll go back to what I've said a few times..... the car doesn't detonate anymore that i know of. HOWEVER.... there are things going wrong now, so I believe that the detonation hurt it somehow. So I'm gonna have her checked out and possibly ditch the bitch cause I'm tired of the bullshit associated with these things when the previous owners lie to you about maintenance.

hypntyz7

Well, offer it to me first if you decide to ditch the bitch, since I tried to help you!

Felix Wankel

Nitrous on a detonating engine? Oh yeah, just what an engine that is running lean needs, a denser intake charge! ''Yeah, kick the boost up to 13 psi, that'll cool the intake charge and stop the detontaion"...

hypntyz7

No ****!

2DoritosOnAStick

If you believe all the bullshit Corky Bell writes, you will always be one step behind. Whether you choose to believe it or not, water when atomized into the intake charge significantly reduces charge temp. Water when it evaporates pulls heat out of the air, this is a PROVEN FACT. Steam in the combustion chamber also cleans carbon off the internal compontents.

A friend and I will be running our own 3 stage water injection kits when it's all finished. The goal is 500rwhp from stock twins on his supra TT with a custom shorty header (stock manifold sucks) and water injection. Why? To say he can

Whether you want to run more boost, or have a bit of safeguard against detonation water injection will always have it's place.

NZConvertible

Absolutely, water injection is proven technology and there are some very sophisticated and effective kits out there from the likes of Aquamist. It has its downsides like anything (complexity compared to intercooling, need to refill the water) but a properly designed system is as effective as an intercooler with the bonus of a short, restriction-free air path. Ignorance of its abilities is the main reason it is seldom used by modifiers.

xen

Jeez, what happens when you burn it?

sinfestboy

wait a second, how is what corky bell writes bull ****?