Alright i want a little more hp and with no tune coming anytime soon im considering a small amount on nos or water/meth.

i would be using this nos kit.

http://www.holley.com/05134NOS.asp

or this mater/meth kit.

part number 30-3000
http://www.aempower.com/ViewCategory...CategoryID=120

I need input, any experience with either system.

 

Nitrous oxide and water/meth injection really serve two different purposes. The nitrous kit can add significant power, but the water/meth injection is primarily to prevent knocking and pinging, and is really most useful if you already have engine modifications or a tune that won't allow you to use pump gas without the knock sensor activating and retarding your timing. With a stock engine on premium gas, the knock sensor probably isn't activating often enough for water/meth to make much of a difference.

 

I wish I could remember who did the test but, with meth injection on a turboed vehicle you can keep giving it more spray and and advance the timing and add major hp I will look for the article. Wikipedia describes it all in the 1st paragraph. http://en.wikipedia.org/wiki/Water_injection_(engines)

 

you have to be carefull doing "alternative" mods like these. if the water meth combo advance the timing, and you dont have the right octane youll do some serious piston damage.
if you use NOS and dont upgrade the pistons, you can melt them if you get to agressive with it.
If you read any engine performance building book on the market you'll find that they all tell you that if your going to play aroiund with NOS you need to build the engine differently.
You will get lots of people "claiming" how they run it with no issues, but it will shorten the life of the motor and that is a fact.
why not work on the turbo boost? it's conservative from the factory, you can bump it up a bit with no harm to the engine. maybe someone else on here can chime in on cost involved.

I also noticed that the NOS kit dosent tell how much of a shot it is. If it's a 25-50 shot, is not all that bad if you stay concervative with the trigger. But a 100+ can blow your motor in no time

 

A gasoline's octane rating is nothing more than a measure of its resistance to detonation/knocking. If you've suppressed the detonation issue with an alternative method like water/meth, then it doesn't matter what the particular octane of your gasoline is, as long as there's no detonation. Of course, as others have pointed out, if you have an aggressive tune that *requires* water/meth injection to combat detonation, then you're pretty much locked into using it at all times.

 

but if you used a lesser octane that would retard the timing in order to avoid engine knock, which in return rob the vehicle of its power output.
so the octane is very important in the cars power potential

 

The ECU doesn't analyze the gasoline's octane rating and retard timing to *prevent* knock - it listens for knock and *then* pulls timing as needed. So as long as you're not getting any knocking (such as by using water/meth), it doesn't matter what the actual octane rating of the gasoline is.

Likewise, adding water/meth in and of itself doesn't cause the ECU to advance the engine timing - it just prevents knocking, which in turn prevents the ECU from retarding the timing.

So, you'll never run into a situation where the water/meth itself causes a timing advance that results in knocking from too-low of a gasoline octane rating.

 

Another thing: the methanol is only used as an antifreeze. Water injection systems were originally installed in large piston aircraft engines to allow them to run their superchargers in high gear, high boost, and best power fuel-air mixtures at any altitude. The alcohol was added only to prevent the water from freezing at altitude.

As an example of how much extra boost these engines made to take advantage of the water injection: according to the Pilot's Manual for the F4U Corsair, the Pratt and Whitney R-2800-8 had a normal full throttle limit of 44 inches of mercury (+7 psi boost) to get 1,675 BHP. With water injection the limit was 57.5 inches (+13.6 psi boost) to get 2,250 BHP.

Isn't an aviation maintenance education great?

 

Yep - the methanol also absorbs heat as it's vaporized, but less than half as much heat as an equivalent mass of water.

Plus, the methanol is 20% less dense than water, so if your sprayer is set up to spray a fixed volume of fluid, you'll get 20% less mass injected into the airstream with pure methanol than you would with pure water.

Methanol does provide a little extra power since it's combustible, but in terms of cooling, pure water is more than twice as effective as pure methanol.

 

@KenG,
very interesting info