gratian

Well,I search and I found that on a turbo car is simple to add Water injection.
Can we do something to our NA cars? I mean alcohol,water or something similar...

AznDrgn

why? You use water/alcohol injection to prevent detonation on a turbo car under high boost on an NA you shouldn't ever be detonating and if you are you just need to run better gas.

Geo

Actually, the reason you can add water to a boosted car and get better performance is that despite the fact the water displaces to the engine, in a boosted car you can just boost more, and with the cooler air it's less likely to detonate.

On an NA the water would displace air to the engine and reduce the power more than any lowering of the temp could produce gains.

Danno

Also you have to consider the delta-T of the water in a turbo engine. When you inject water at ambient temperature into a 250-degree stream of air, that water's gonna vaporize and absorb 540-kcal/mole and reduce the temp of the air down to 170-190-degrees. This cooler denser air will allow you to run more boost and make more power. However, if you do not run more boost, you will see minimal benefits from the cooler mixture, unless you program in more ignition advance and take it up to edge of knock/detonation. So water-injection and cooling the air in itself has minimal benefits unless you tune for it. Similar to adding higher-than-necessary octane gasoline.

Now let's examine water-injection in a non-boosted engine. Injecting water at ambient temperatures into a stream of air at ambient temperatures will most likely not have it vaporize. So it will provide minimal cooling effect to that air (70-degree water injected into 70-degree air won't really cool the air much below 70-degrees). This water will then displace some volume that could've been used to transport oxygen into the engine. So you'll most likely end up with less power because you'll have less oxygen to combust, and mixtures will be too rich (remember that '60s hot-rod saying?)..