hey slowcar, u seem to be one of the most knowledgeable when it comes to meth injection. what if someone didnt want to do a full blown system with failsafes and an aggressive tune, could there be a benefit to run a small nozzel just to aid in the cooling of the air, kind of like a super intercooler but not getting into overboosting. like make the car run better on the hot 90 degree days?

 

run distilled water....
...sorry, This is slow car

...not lol

 

so i could run the bigger nozzle even though im out of the operating range (hp wise)?

 

http://www.aquamist.co.uk/rescr/rescr.html


35. We shall see the intercooling properties of water injection.
Water temperature is 25°C and the compressor exit temperature is 124°C and Water flow rate of 250cc per minute.

In the region we are working in the partial pressure of water vapour in the mixture is very low.
We can assume that the enthalpy is a function of temperature alone within reasonable accuracy (e.g. for 250g /min of water and 8.64Kg/min of air, the partial pressure of water in about 0.06 bar).

Consequently the final temperature is an inverse linear function of water proportional as nearest makes no difference.

The calculation and results:
At 200cc/min: 66.09°C
At 250cc/min: 50.88°C
At 300cc/min: 36.27°C

So there we are, we have proved our point, water is just as effective as an intercooler.
We decided to calculate a few more water flow rates so that a chart can be plotted, useful for visual prediction.

Even at a modest flow rate of 200cc per minute, water is a better cooler than a 50% efficient intercooler by a long way.

Notice at 350cc/minute of water, the final temperature dropped below the ambient of 25°C !!! there just isn't a 110% efficiency intercooler around yet ...

36. Summarising the comparison...
Before rushing out to buy an intercooler or make a water injection, please beware of the short comings of both systems, we listed a few here.

Water injection will only be effective if it is injected in a form of mist, the droplet size is the key to a successful water injection system.

Small droplet size increases the overall surface area, essential for good intercooling property. This is the reason why Aquamist uses line pressure over 7 bars.

 

^ gotta love this guy and his numbers lol

 

so in a nutshell can you use water injection as a addition to the intercooler without a failsafe if you dont raise the boost or timing. like get a 150.00 kit just to keep the intake air cold for track days , hot days?

 

yep.
-a small atomizing jet
-a hobbs switch/relay
-a switch to disable system on cool days
-a bypass pump (due to the very small volume sprayed, a on-demand pump might have longevity issues)
-tank, fittings, tubing and hardware

 

or you can just get AEM and have 1 map for pump and one for race and not have to worry about any "failsafes"

I had meth in my past evo though, and I loved it. You need to get tuned though if you want to run more boost... that's the whole point of it.

 

thanks for the info, it seems like all turbo cars should at least do this type of setup if they are scared to go all out. 90+ temps have to put a damper on the intake air of a turbo car.

 

Not everyone has the funds for Aem, but if you're giving yours away

meth > heatsoak
water > heatsoak

 

90F+ ambient air
90F+ intercooler
90F+++++ in intake manifold

a little bit of water will do wonders

 

ok thread jacker... back to my last question post 19

 

if u're running 100% methanol, slap the biggest nozzle in.

if you are running 50/50, you will prolly cause misfiring or over cooling due to the lack of precision of a progressive pump speed injection system