Danger Den CPX-PRO Pump previewed..

[Xilikon]

LAING

happy?

Thanks, just a small pet peeve of mine

[Eternalightwith]

What if you replaced that plastic propeller with a lightweight metal instead? Slightly heavier yes. But it would never break. And the added rigidity might be a plus in water pressure

[NaeKuh]

What if you replaced that plastic propeller with a lightweight metal instead? Slightly heavier yes. But it would never break. And the added rigidity might be a plus in water pressure

depending on the metal would cause havok in your system. :T

[DarthBeavis]

LAING

happy?

Artie Laing?

[Martinm210]

I tried to find a comparison but only saw the D-Tek mentioned once.
BUT

It looks so much like the D-Tek dB-1,
I have had those pumps and loved them,
they were very quiet and great for single loop setup's.
And seemed to have good head pressure.

So how do they compare,to the Danger Den CPX-PRO
then look the same, cost the same....
hows the performance,


My favorite is the
Laing DDC-3.2 with the XSPC - Acrylic Reservoir ,
it's just a great all around set-up.

The D-Tek db-1 = CPX-1
This is just the bigger version of that, probably on the order of 3X or a bit more strong.

And yep, the DDCs and D5's are great pumps. I feel bad for the industry a few years ago before the DDCs and D5's came along, there was nothing but low head pond pumps. Those were the days where large ID tubing and large open channel blocks ruled. Now we're getting spoiled with all these good pressure pumps.

What if you replaced that plastic propeller with a lightweight metal instead? Slightly heavier yes. But it would never break. And the added rigidity might be a plus in water pressure

Well since you can't really do much in the way of a custom top for this one, who's first up for designing a new impeller. The only problem is the maginet is cast into the impeller, so you'd have to do the same. It wouldbe hard to pencil out, but it would be cool.

[NaeKuh]

Now we're getting spoiled with all these good pressure pumps.

Spoiled?!?!?!?!?!

martin you so know if there was a pump which performed better then the RD-30 without it being the size of a small baby, id buy it in a second.

I want more!

[cegras]

Why not make a ceramic impeller? : P

[Martinm210]

Spoiled?!?!?!?!?!

martin you so know if there was a pump which performed better then the RD-30 without it being the size of a small baby, id buy it in a second.

I want more!

You know you want that MD-70Z..you might have to run braded hose, but you'd like that.. The RD-30 is a baby compared to that thing...

Ahh..while your at it put two in series...just be sure to string about a dozen PAs together to take on the added heat..

[Xilikon]

You know you want that MD-70Z..you might have to run braded hose, but you'd like that.. The RD-30 is a baby compared to that thing...

Ahh..while your at it put two in series...just be sure to string about a dozen PAs together to take on the added heat..

While you're at it, don't forget the raincoat in case you forgot to tighten a barb

[ripken204]

any new info on this pump such as release date?

[ripken204]

i emailed DD and the said 3-4 weeks

[Gabriel Noraa]

I'm looking forward to this pump. Jeremy said they had small issues during manufacturing start so they will need a few weeks more until it's available. The impeller looks a lot like the Eheim ones.

[ripken204]

another delay

3-5 weeks

[redgabber]

Hi everybody... i m seriously thinking about this CPX-PRO pump.
I look for silence and silence. i m sure this pump is powerfull for common operation. (sorry my english is dirty)

Is the DDC 3.2 + Top noisier than the CPX-PRO ? and compared to the D5 #3 or #4 ? I know the DDC 3.1 sound, and it runs ok for my ears.

I m a beginner in WC and i know there are PROs in this topic so...i ask

Thanks waterboys ^^

[century child]

Hi everybody... i m seriously thinking about this CPX-PRO pump.
I look for silence and silence. i m sure this pump is powerfull for common operation. (sorry my english is dirty)

Is the DDC 3.2 + Top noisier than the CPX-PRO ? and compared to the D5 #3 or #4 ? I know the DDC 3.1 sound, and it runs ok for my ears.

I m a beginner in WC and i know there are PROs in this topic so...i ask

Thanks waterboys ^^

I have one of each of these pumps in 2 different systems (ddc 3.2 with XSPC top in one and cpx-pro in the other) and, in my case, the ddc is much louder.

[redgabber]

I did some investigation from several US and EU forum and i have a question about the DD-CPX-PRO here.

The only strange alien i found is the DD-CPX-PRO feature 800 l/h
I never see a DDC 3.2 + Top running this flow rate...

So Martin says a DDC 3.2 + Top will perform better than the CPX-PRO..
It's strange... even if the DDC have 0,7 more pressure.

Huhhhh ??? are they attacking yet !?

[Vapor]

Martin's testing data that was included with his estimator:

[redgabber]

Martin's testing data that was included with his estimator:

ok ok.. well it's estimator.

I m actually using a Laing 3.2 + EK top V2 (better than xspc top)
and i never reach 4 gpm. (low restrictive loop with x2 gpu + MCR220)
I m pretty sure that if i play the pump without any waterblocks, i will not reach 800 l/h

Mathematics are nice... but in real world ... hmmm
I have doubt with this diagram, no doubt about Martin skills but there is an Alien somewhere ^^

[OdinEidolon]

so the mcp355 is still way better than the cpx1pro... what about noise? martin said that it is the quitest pump he has ever tested, but the 355 is low noise too. will the difference be noticeable?

[redgabber]

Concerning the noise, i would be ok with Martin and other tester. the CPX-PRO with its mecanics seems to be quieter with low heat. i can believe that.
Note that the new EK Top V2 makes the DDC like "dead silence" (i have one and it's amazing)

But about the Flow... i continue to look for an alien ^^
I m a sofware engineer, i build many set-up tools for the clinical industries. Be sure that mathematics are often bypass the reality.

[Vapor]

ok ok.. well it's estimator.

I m actually using a Laing 3.2 + EK top V2 (better than xspc top)
and i never reach 4 gpm. (low restrictive loop with x2 gpu + MCR220)
I m pretty sure that if i play the pump without any waterblocks, i will not reach 800 l/h

Mathematics are nice... but in real world ... hmmm
I have doubt with this diagram, no doubt about Martin skills but there is an Alien somewhere ^^

The data is real data that he tested that is embedded into a system-flow estimator....that's how I have it (and how anybody can download the estimator themselves and graph any comparison of TESTED P&Q curves they want). It's an estimator because it takes real data from pumps and components and estimates flowrates as you combine them. The data itself is not an estimation--just what the Excel spreadsheet does when it combines the two different types of data is an estimation. FWIW, I did not combine the data in any way, I merely graphed the real data!

And of course you don't reach 4GPM. You probably wouldn't even reach 4GPM with three of your pumps and only a few feet of tubing and a radiator

[redgabber]

The data is real data that he tested that is embedded into a system-flow estimator....that's how I have it (and how anybody can download the estimator themselves and graph any comparison of TESTED P&Q curves they want). It's an estimator because it takes real data from pumps and components and estimates flowrates as you combine them. The data itself is not an estimation--just what the Excel spreadsheet does when it combines the two different types of data is an estimation. FWIW, I did not combine the data in any way, I merely graphed the real data!

And of course you don't reach 4GPM. You probably wouldn't even reach 4GPM with three of your pumps and only a few feet of tubing and a radiator

Ok Vapor...now i understand ^^

[Martinm210]

It's a very common misconception with pumps and pump specs. Alot of pumps don't give you any sort of pump curve to look at. They will only give you the maximum flow rate which is the theoretical maxium without any pressure. They also often give you a maximum head pressure which is at 0 flow or cutoff head pressure. The result is they they are giving you the two extreme points at each end of the curve.

Unfortunately it's two points that you will never operate under. Give the estimator a try and you can better see the interaction between the system's pressure drop curve and the pump PQ curve.

When testing pumps as I did in this case, I recorded actual pressures at specific flow rates and varied the amount of resistance (gate valve) to control and distribute those measurement points over as much of the curve as possible. It's the only way to really get a measurement over the entire usable range of a pump and important to see because some pumps have a nice curve like the DDC while others are more linear like the CPX-pro. If your pressure drop curve happens to fall where there is a nice bulge in the curve, it's good. It's also possible for a pump to have a higher maximum pressure and flow rate specs and perform worse than another pump if the two curves are very different in between those points.

Anyhow, don't look at maximum flow rate as a means to determine pump performance. If you do that with the D5 and DDC, you would come to the conclusion (inappropriately) that the D5 is the better pump. That's only one point and doesn't tell you much by itself. Specs are also unfortunately often wrong. For example the MCP-655 Basic pump and the MCP-655 Vario according to most vendors are exactly the same. They are not, the vario model is a good amount stronger than the basic because the basic model is crippled and stuck at setting 4 where the vario can run to setting 5. I noted these inconsistencies to Swiftech several times, pointing them to the Laing docementation that concludes this.

Here we are over a year later and no change. They simply don't care and people will continue to make bad decisions based on pump specs.

Bottom line, pump performance is more complex than a simple max flow rate and don't trust pump specs anyhow, they are often wrong.

[coolmiester]

What a great post so eloquently put..............as always cheers Martin

[redgabber]

OK Martin, i m ok with your conclusion. When you have to buy some liquid cooling elements, you know it s expensive. So people ask to others, sometimes too much, but the goal is legitim : spend Dollars/Euros and take the good decisions. The marketing doesn't help anymore.
But it's time to order now. More i read topics, more i discuss with XS forums members, i take good time for sure ^^ but more i m disturbed by seeing opposit voice about several concepts ...then more i think it's hard to be good in my choice ^^