The above DDS3 v8 drawing shows how the DDS3 can be used to construct a single stage water injection system wirth only a few parts, possibly obtainable in most home depot stores for less than 100 dollars (not including DDS3v8).

The alternative shopping list (non aquamist component):

1) A 60psi diaphragm water pump: from $45.00 click here
2) A nozzle: from $10
3) Inline filter/fitting hose/relay etc 25 dollars
4) a 1-bar check valve: from 18 dollars
5) solenoid valve option (in place of check valve).

I believe a single point ready made system will cost ~$300 without any failsafe. The above system can be built around $375.

There is also a simple upgrading path to a more complensive system from Aquamist in the future, if preferred - full system, compatibility due to the DDS3.

Please comment

.
.

 

very nice, this is similar to the snow kit minus a gauge...best bang for buck systems, stage1 with failsafes...

 

nothing in the market comes close in terms of the DDS3 for the combination of price and safety. The user definable safety operating window is what sets this failsafe apart from the rest of the "flow sensors" out there. Flow outside the defined window = NO BOOST....wastegate pressure actually (~12psig)

 

one of this boost defeating solenoid will complete the setup

http://www.macvalves.com/PDFS/36_Series.pdf

~$23

excellent valve, used by big guys out there like AEM and turbosmart

 

Damn, who thought this clever design out?



Slowcar, who can sell one (ea) of those mac solenoids? Last I heard they sell 50 at a time

Also, I need one of those 14 psi check valves(14psi pressure bypass, right), where at?

I need these parts to refurbish my homemade OEM DV stop leak

 

mac valve distributors, they WILL sell you one

http://www.macvalves.com/distributors/USA.htm

aquamist has an excellent high precision metal to metal seal 15psig checkvalve

806 248 or 806 249

http://www.aquamist.co.uk/sl/plist/frm-4-USD.html

you using 1/4"OD tubing?

 

You wouldnt happen to know off hand the WGA solenoid coil resistance (MAC)?

Richard,

is the 806 155 (NO 0.2 - 2 bar pressure switch) for liquid, air , or both?

And does the 0.5amp rating mean that a relay (or whatever it routes power to) can't draw a load beyond 0.5 amps? Right now I'm running a 10.5 psi differential psi switch (dont ask where I got it), It's silicone microswitched and closes on time, it just lags upon reopening (lowest bid aircraft parts)


I actually need a part similar to function of that but has to be pneumatic and needs to be more like 5-7 psi upon opening

snow failsafe:

 

the resistance of the mac solenoid coil (12V, 5.4W) = 27ohms

 

Richard, a lot of users of injection also use a MBC. Would be nice if you could show a schematic of the dds3 + mbc + failsafe solenoid valve

 

The 806-155 can be used with air, water or alcohol - NBR diaphragm. It is available in EPDM also on special order.

The contact rating is 0.5A, it is designed for routing signal rather power switching.

Are you saying there is a time lag between pressure rise and contact closing? Can you adjust the dead band?

Richard

 

Yes, I will do it. It will be based on the 2/3 MAC valve?

Richard

 

i think the mac valve suits this application very well because its reliable, fast acting, low power consumption, high Cv and very resonably priced.

 

The switch closes contacts at 10.5 psi differential and opens when pressure is less. It lags in opening after pressure decreases.

Switch controls a solenoid which vents or supplies air to the bottom of DV diagram allowing for solid boost operation above 10psi and stock drivability under 10 psi.

I added a home made ball sring relief valve to compensate for the lag but it's loosing it's simplicity.

If theres a switch that doesnt lag

 

Do you what causes the delay in the re-opening? Most mechanical switched has a fixed hysteresis of a psi or two. The hystersis is desiged related- plunger/micro switch type has more than the diaphragn type.

Can you post a picture of the switch so to help me identify what type.

 

Richard what is the voltage requirement for the map sensor imput.