Water Injection and e-Cool

[carlb]

I'm planning some mods to my BRP/FFS Coldside supercharger. The FFS manifold has a location for WI nozzle about midway down the manifold. However, the 5th injector location sits just below the Supercharger outlet. Does it make the most sense to have both water injection and eCool?

I have been planning to add larger injectors (460cc Rx-7 injectors controlled by Megasquirt). If I do, would I get better results putting the WI nozzle under the supercharger where eCool is currently located or keep it in the "stock" location centered in the manifold?

I've thought about adding dual nozzles, one pre-supercharger to cool it down. But, I've heard that methanol is very corrosive and will eat up the rotor coatings. I'd have to run pure water to do. Still might be an option if I think I can gain more than with having an methanol/water mix. Right now, I'm guessing no.

I'm trying to test to see if I can SAFELY get to that 120mm pulley and maybe much closer to 250hp.

Thoughts?

Thanks!

[FormerDatsun510Man]

Since you are going with WI and larger injectors, I think substituting the 5th injector location with the WI nozzle is a good one. Provided you can thread the WI nozzle in that hole. Theoretically at least, the WI would have the best distribution at that point. The fifth injector isn't necessary at that point anymore and besides you would probably get better fuel distribution with four larger injectors. If there are problems using the fifth injector hole for the WI nozzle, you could still just put the WI nozzle in the hole for the WI and still remove the fifth injector.

Bill

[carlb]

Thanks Bill. That's where I am leaning.

I was hoping that putting the water injection in a 5th injector location was a relatively common problem and someone would have developed an adapter of some sort. I'll have to root around and see what I can find.

[Kyp J]

Stupid question time. I don't know much about WI but I think it uses a fairly high pressure pump to inject water. I don't know anything about fiool injecturs more than how to spell them (apparently not even that much).

Can you guess the stupid question?

[Tom @ Fast Forward]

Carl,

You can get a 5/8-18 socket head cap screw and have someone drill the center to have a recess and 8mm-0.75 threaded hole for the WI nozzle. Then screw in the 5/8" bolt with an O-Ring like the 5h injector and install the WI nozzle. Should work.

[carlb]

Thanks Tom. I'll have to give that a try.

[Kyp J]

Stupid question time. I don't know much about WI but I think it uses a fairly high pressure pump to inject water. I don't know anything about fiool injecturs more than how to spell them (apparently not even that much).

Can you guess the stupid question?

OK, if nobody is going to guess, can you squirt water thru a fuel injector and why not?

[Tom @ Fast Forward]

Fuel injectors would pass most any liquid with a low specific gravity like water or fuel. Not sure if it would rust? You would have to properly size the injector to the amount of water you want to inject. Our E-Cool injector, for example is roughly 500cc/minute at 43PSI.

The specific gravity of gasoline is 0.739 so I wonder if the flow of water (SG = 1.00) "might" be 0.739 x 500cc (in the above example) = 370cc at 43PSI? The denser water might not flow as easily as the less dense gasoline.

[Banshee]

A simple way would be to use one of the vacuum/boost port at the front of the manifold as a water injection port. This is what I did. I use both the WI port in the middle of the manifold and also the very front vaccum port. No need to redrill. There's plenty of water injection nozzle with the same thread size.

[carlb]

A simple way would be to use one of the vacuum/boost port at the front of the manifold as a water injection port. This is what I did. I use both the WI port in the middle of the manifold and also the very front vaccum port. No need to redrill. There's plenty of water injection nozzle with the same thread size.

Very interesting. Are you also still using eCool or did you get larger injectors to replace the stockers?

Also, what WI system are you using Devil's Own, Aquamist, or did you DIY?

If you can just point me to where I can buy the nozzles you used, I would be forever grateful!

Thanks!

[Banshee]

Very interesting. Are you also still using eCool or did you get larger injectors to replace the stockers?

Also, what WI system are you using Devil's Own, Aquamist, or did you DIY?

If you can just point me to where I can buy the nozzles you used, I would be forever greatful!

Thanks!

I got one of the original kit without e-cool. I'm straight WI. I use a aquamist nozzle 0.4mm for the original Water injection spot. I then use a "aquasteath" nozzle for the front vaccumm port. I think it was a 75cc/min size. I made my own kit, but essentially its just a devil's own kit. Nothing fancy. Cost $200 at most.

Also, Track down a canadian washer bottle, it'll extend your refill interval by a factor of 3.

[carlb]

I've searched and searched and can't find an "aquasteath" nozzle. Where did you buy it?

[Tom @ Fast Forward]

Carl,

Start here.

http://www.aquastealth.com/index.asp?Category=203&PageAction=VIEWCATS

[Banshee]

http://www.aquastealth.com/index.asp?PageAction=VIEWPROD&ProdID=99

[carlb]

http://www.aquastealth.com/index.asp?PageAction=VIEWPROD&ProdID=99

Gracias! Appreciate the direct link.