how much to inject?

[Phreakish]

I tried searching, with no luck...

How much water can I inject into a suck-thru T1 without hurting anything (I dont want to trial-and error a set of rods!).

I want to get to about 14psi on cool days, and am changing induction to suck cooler air too, I only run 91+ octane, so I dont think its pushing it.

I have a cut-out raiser ready to install, but want to cool things a bit (as well as add some more fuel over the cut-out point), and would like to do a water, or water/alky injection.

So, how much is too much? Not spraying enough and Its not worth doing it at all, spraying too much, and I'll be towing my car home at the end of the semester...

[QKsilverF1]

if you sprayed too much you probably wouldnt see any damage unless the water wasnt atomized and it washed the cylinder walls or something. if you were spraying too much the car just wouldnt run well

[Phreakish]

how would I know its too much? Should I add a certain amount until I see something from the exhaust, is there a 'recommended' flow rate for a mister? What is considered GOOD?

[supercharger2.2]

http://www.dawesdevices.com/howto.html

[QKsilverF1]

that site reccomends injecting WAY too much in my opinion. they reccomend using a 9.xx GPH injector which translates to 600CC/min id keep it around 200cc/min mabye 300cc/min max

[QKsilverF1]

yeah i just flow tested one of those injectors reccomended on dawes devices.com and it flowed 900cc/min, but that was with a walbro 255 pump so it was probably making some pressure

[Phreakish]

so 3 to 5 GPH... thanks! now to build my injector hat!

[dodger]

I will be using 5GPH on my 300hp set up.

[Phreakish]

whats the main reason for using it? enrichment? or charge cooling?

[TRRBOJEEP]

5 gal/hr is good for a little charge cooling, but not much for enrichment. I'm up to 15 gal/hr now. (and climbing)

Basically, if your car is adequately fueled now for the boost level you're running, and you just want a little charge cooling and a bit more octane, the 5 gal/hr works fine. But, if your wanting to up your boost another 3-5psi (or more) and do it solely with the alky, you'll need quite a bit more. (20+ gal/hr)
Plus your mix will change from a 50/50 (distiled water/alcohol) @5 gal/hr to maybe 25/75 @ 15 gal/hr (or just run strait alky)

[QKsilverF1]

yeah i was talking about just adding a cooling charge, with straight water

[dodger]

Iam just using it for extra cooling as i have enough fuel,that way in the hot summer days my timming wont retard,i think our car really benefit from the extra cooling.
For the little money it cost i think everyone should run one,not to mention it lower EGTs.

[QKsilverF1]

yeah i agree with this, i notice a huge difference between summer and winter performance, obvious temperature is a huge factor for our cars. Im making a IC sprayer in addition to water injection for added cooling

[Phreakish]

very good info! thats exactly what I wanted to know! how much to add for enrichment, and how much for cooling... I want a little of both in the near future

I need to install a new fuel pump first, and get some other things squared away so I dont blow the engine out due to stupidity... But until I get my IC installed into my log charger, I'm thinking of building a mister setup for some cooling, and a seperate alky feed for enrichment over 12psi (to about 15psi). But I've still got some other projects cooking to get me THAT far...

[QKsilverF1]

i could see alot of benifit from water injection in arizona, i used to live in scottsdale and it would be like 120 in the summer sometimes