Re: Technical?Anyone have Nitrous on their Xfire?
Originally Posted by screaminjoe
Thanks guys, but I am really curious just to see what gain someone got from a stock crossfire, but I would expect a 50 shot would lower the quarter by about 1 second. I am very knowledgeable on using Nitrous itself, I had it on 2 prior cars and contrary to the nasty rumors that NOS blows up engines and increases wear, that is especially not true on a 50 shot. All Nitrous is, is a chemical supercharger or turbo, absolutely no difference to your engine than adding a turbo or supercharger. Both ways you are increasing the oxygen that can be burned in combustion. With a supercharger or turbo, you force it into the same cylinder volume under pressure with Nitrous you are adding more oxygen to the air mix chemically. The only way Nitrous wears or blows an engine is when there is not the right amount of fuel added to compensate for the extra oxygen, but a turbo would cause the same damage if a rising rate of gain fuel pressure regulator wasn't used or the stock fuel pump couldn't keep up. The NOS bad rumors come from the guys taking short cuts and not upgrading the fuel pump, when they go to a 75 shot or higher, or not get the jetting the fogger correct, both which cause a lean condition and possible damage. Also, not retarding the timing when using a 75 shot or higher, which causes an extreme heat increase from the excessive compression change (retarding the timing 3-4 degrees for every 40 hp of NOS, decreases the compression to compensate for the increase). As far as warranty, you just have to be smart and remove the tank and lines before bringing it in (cover your tracks). I ran 200 bottles through my '85 Supra, and never had a single problem or sign of engine wear. I sold the car with 250,000 miles with the original bottom end and it was still running strong and not burning any oil. I had a '93 MR2 turbo, that I also put 30 bottles through with no problems (which was a 12.2 second car) My friend is still driving the car today as his daily driver and it runs like new. Again, just be knowledgeable on what is happening when you use NOS and install it right, but also check the plugs after a night at the drags to make sure all cylinders are getting the right amount of fuel.
Not sure why your asking about details on the Crossfire since if your are already familiar with NOS, the setup in most vehicles is pretty universal. Electrical gremlins are common in M.B. cars without mods so this factor might be increased with NOS.
Also you were first talking about a 125 shot and now a 50 shot...sizable difference along with the effects on your engine. Like I previously posted, I have also used nitrous in the past and can tell you using it frequently especially in the higher shot range, will cause engine wear.
Your comparison to a supercharger or turbo is not valid since both of these provide power in a somewhat linear fashion compared to the "hit" of a nitrous shot. If your familiar with the way NOS works, your aware of how this "instant" power can adversely effect an engine. Added to the fact that most of the time factory cars that are supercharged/turbo'd are usually reinforced in one way or another to help compensate for the increased power.
Are you going to go to the trouble to remove everything when you take if your car even for unrelated repair issues ?...since you know the car will be flagged to you having nitrous if they see it...on one of mine. I integrated things like a gas pedal activation switch, bottle mounting brackets into the floorboards, and the spray nozzle which was drilled into the aftermarket metal cold air intake. Would be quite a pain to uninstall and reinstall these things ever trip to the dealer. Even without all that stuff in there, the dealer is going to start snooping to find the cause if you come in with burned valves, pistons, etc...
So, as in most cases, if this was in an adjunct to other full time power mods already done to a vehicle (i.e. turbo/super kit, intake, pulleys, headers, etc), it would be the next logical step...but on a new stock car, esp. one with that was not designed for high-performance; your risks outweigh any real net gains...
Last edited by respdoc; Nov 9, 2005 at 10:29 PM.