During my research I recall some one said you need a check valve with a high "cracking pressure". One of the difficulties of building your own system is trying to find the right components, components that work properly and are durable. Seems you have to worry about leaking check valves, solenoids, and fittings. Since the pressure differential on the micropumps is 100 psi, it might be a better idea to hook it up in series with another pump. I have acquired two used 24 volt micropumps and two 12v to 24v step up transformers. I thought the micropump would be well suited for a continuous operation setup like Aquamist uses. It would be interesting to know if it could be adapted for use with one of their systems. Richard if your interested in testing one of these pumps to see how suitable it is for a methanol injection system, I can send you one. You could return it to me in the future or we might be able to work something else out.

 

I was planning to do some very basic test. As far as I gethered, there is 0-5V input yo control the speed of the pump motor.

Steps on my test:

1. Apply 12v and 24v to the pump
2. Record pressure, flow against an input of 0-5V in 1V steps with a nozzle
3. Repeat the above with a couple more nozzles
4. Chart it

Once we know how the brief performance data of the pump, we can predict the outcome when couple up with a map sensor.

I believe 94AWDcoupe has missed this bench test stage and went on to a MAP sensor. Alternatively, you can perform the same test as me, just need a trimmer potentiometer and a voltmeter. Ideally, record the line pressure and water into a measure glass. I am very happy to do this as I have all the setup on the bench at all time, takes no time.

 

Any news on this wonderful pump?

 

nope. on to different methods. will just resell these pumps on ebay.

 

It is a pity, after all that catchy title, this project stalled without a meaningful conclusion.

 

sorry I am not on same level to you.
by seriously you should get your hands on one and consider designing one to the specs we need. i an sure it can be sized larger with 200psi and sufficient flow.using someone elses pump that doesnt hold up that well is my biggest complaint about what you are doing with your kits. if your kit had a reliable pump in it i would be using them...

 

I am more than happy to continue with your research if you can sell me one of the pumps. As time is of no essence, shipping to England via USPS is very reasonable please email me the total cost and I will paypal you.

We have 24 volt supply here to test the full capability of this pump.

 

Can I assume you don't want the go further this "God's gift" pump?

 

I just acquired a Micropump for this very purpose. I'm curious. I'll send you the pump if you pay for shipping.

 

I have no commercial interest on this pump. I offered to test the pump for free in my spare time.

I am not sure if I want to pay shipping on top just to help someone's brain storm regarding using this pump for water injection purpose.

As far as I am concerned, the 0-5V is just a speed control for open flow (unrestricted). It is no good for controlling volume through a restrictor (a nozzle for example).

I could be wrong.

 

I'll tell you what. I'm going to buy two and send you one. They were $40 on ebay are there are lots of them.

After doing quite a bit of reading, there are many pump designs. I'm not sure what I bought but it is EGR-177 which is a little bigger of a model than what he has here. Please PM me your mailing information.

 

The biggest problem is the supply voltage. 24V DC is not common on automotive applications.

I am more than happy to test and study it for you and I have give you a report (for my own interest too) and return the pump back to you.

I want to see it for myself how good it is for WMI applications.

 

Something to keep in mind... this pump is used and therefore could be on its last legs as far as we know. This may cause a flow rate concern that may not actually exist.

Also, i planned on using a 12v to 24v step up converter, do you bieve the power would. Be sufficiently clean? I know you would lose something in the converrsion process. These converters arent suitable for stereo amplifiiers i know that, but perhaps these pumps would be ok? Also i need your mailing info so i can ship.

 

I will keep that in mind when I test it.

As far as I know, the pump is a gear-type. A positive displacement pump with a 100psi by pass valve.

For open flow (no restriction) the volume is proportional to RPM (0-5V).

If a restrictor is placed on the outlet (nozzle), pressure will build up as you increase the RPM. Once it has reached 100psi, you will not expect to see any more flow volume increase. The point where it reached diminishing returns will depend on the size of the restrictor. A small nozzle will max out much earlier point along the 0-5V input than a large nozzle. Therefore the flow is not linear to 0-5V input on the entire range.

I have emailed you by address. I hope I am wrong because it is a good pump. We will soon find out if it is really a god's gift to wmi.

 

By stepping up the voltage I believe that the available current may be lower.