MCP655-B mod needed

[rbsmontemor]

Some one know a way to make this pump stronger? We know this pump is limited to setting 4, while other version has setting 5.

Someone could help me on this? Or the only way to have more flow is buying the another model?

I want to do this coz' messing around with martin's estimator I saw a considerable flow drop with the GPU block I'm planning to buy:

D5 vario (Setting 5)



D5 non-vario (setting 4)



What do you think about?

Thanks

Rbs.

[silverphoenix]

get 2 of martins elbows and call it a day hehe. Not sure on how to mod that pump though mebe some1 can here can help you though.

[welshtom]

You are between "Good" and "Great" on the flow graph - nothing to worry about.

Flow is over-rated, As long as you over over 1GPM then the performance will be negligible

[ownage]

There's almost no difference between 4 and 5. At least i can't notice any difference, just like some other forum members.

[XS_RoB]

Martinm210 also modded a D5 (dont know if he still uses it) but he used a dremel and rounded the sharp edges off on the inside. I will try to search for it for you.... yes - and here it is

http://www.xtremesystems.org/forums/...&highlight=mod

If it was good enough for Martinm210 it was good enough for me and I have since done to same to mine.... I have nothing to measure performance with - so I hope it was for the good!

But your flow looks really good and I would not stress it...

L8r
RoB

[rbsmontemor]

I did the port mod too

Look at what he said:

In fact the MCP655 variable model is almost 30% stronger in max presssure head than the MCP655-B

I can sell this one and get Vario model...but I really want to mod this one...It's really fun do this things

Rbs

[rbsmontemor]

Ok, martin's pics:

D5 vario:



D5 non-vario:



Someone help

Rbs.

[Jedda]

Until someone can take the DMM readings on a vario at setting 5, work out what resistor needs adding you're sool.

[rbsmontemor]

Until someone can take the DMM readings on a vario at setting 5, work out what resistor needs adding you're sool.

English is not my first language, so if you can re-write this for a newbie in english

Yes I'm waiting for someone to make some readings, but I don't understand the second part

Rbs.

[XS_RoB]

English is not my first language, so if you can re-write this for a newbie in english

Yes I'm waiting for someone to make some readings, but I don't understand the second part

Rbs.

too funny....

What Jedda is trying to say is that we will have to wait for someone to test to see what resistor is needed in order to achieve the speed of the setting 5 for non-vario's. The second part he is using US slang roughly and nicely tranlslated - " Until the time that someone test's the D5 - you will be Sh*t Out Of Luck - or nicer version of So Out Of Luck "
No worries - we will just have to wait until someone posts how to mod the electrical side so that the non-varios can achieve that elusive speed setting of "5" But with it being so close - I dont think there is much intrest in it, for what ever the reason.

Hope this helps clarify a little better for you....

[rbsmontemor]

hahaha yes, now i can understand

Martinn heoolpp with the mod!

Rbs.

[rbsmontemor]

The nuber on the side of the pot "103" means that is a 10K pot...but there are 2 marks on PCB for 2 resistors under the pot...looking at PCB lines looks like the resistors are in paralel with the pot.

But I need to know if the resistors are there or not.

Rbs.

[IanY]

Biddy,

You need to buy another D5 Vario pump and run them in series, back to back. You will have more head pressure and you will also have redundancy in case of pump failure.

[rbsmontemor]

contacts

Yeah, but I don't know if in vario model there's R17 and R18 soldered, under the pot.

Biddy,

You need to buy another D5 Vario pump and run them in series, back to back. You will have more head pressure and you will also have redundancy in case of pump failure.

Biddy

It's a good ideia, but I do not have space for this, and I like to mod things

Rbs.

[Xilikon]

If someone can pull this mod, it would be beneficial for everyone. I'm also curious how it works.

I think someone need to have enough balls and unsolder the POT of the Vario to see if there is resistors under it or bring the Vario to a electronics repair store and ask for some ideas. What the POT do is vary the resistance amount and I guess that to make it faster, you may need to decrease the resistance but the lack of resistance made me confused... Don't shoot me because electronics and me isn't a nice marriage.

[Eddie3dfx]

This would help me out tremendously as well and I have googled this to no end.
My B pump is substantially weaker than my other D5.

[rbsmontemor]

If someone can pull this mod, it would be beneficial for everyone. I'm also curious how it works.

I think someone need to have enough balls and unsolder the POT of the Vario to see if there is resistors under it or bring the Vario to a electronics repair store and ask for some ideas. What the POT do is vary the resistance amount and I guess that to make it faster, you may need to decrease the resistance but the lack of resistance made me confused... Don't shoot me because electronics and me isn't a nice marriage.

Yes I think your logic is right

This would help me out tremendously as well and I have googled this to no end.
My B pump is substantially weaker than my other D5.

And I want a stronger 655-B

Rbs.

[Fujimitsu]

EK is making a top for this pump I believe.. could always just wait.

But you won't get any extra performance out of this, so I wouldn't bother with any serious modding.

[Thorvald]

trip pot.pdf

Bourns® Trimpot®

Perfect, available from Electrosonic (in Canada) and looks like Newark.

http://www.e-sonic.com/aboutus/cat/P/potentiometers.pdf

$1.30 CDN each

Now are there any other differences?

---

Cheers

[NaeKuh]

hahaha yes, now i can understand

Martinn heoolpp with the mod!

Rbs.

LOL wait in line...

he has a ton of stuff to do. :T

And a ton of eq to play around with also.


And the mod trick was the smooth out the outlet bore in the inside. By reducing the sharp edges you get less resistance and hence more head output and better flow.

I havent dont it yet, i was thinkn of retiring all my 655's. There honestly too big, and for a little bigger you can get the rd-30. :T

[rbsmontemor]

And the mod trick was the smooth out the outlet bore in the inside. By reducing the sharp edges you get less resistance and hence more head output and better flow.

I havent dont it yet, i was thinkn of retiring all my 655's. There honestly too big, and for a little bigger you can get the rd-30. :T

He will come, he will come (finger crossed)

I've done the outlet polishing mod while ago heheh.
If you drop the 655s what will you use? MCP355 + Petras top? Are they smaller than 655? I telling this coz' MCP655 doesn't looks so big in pictures, but when it arrived here I looked at that and "oh boy, where I should put that thing now?"

If nothing works maybe I'll retire that pump and buy a MCP355 + Petras top...

Rbs.

[lior307]

Great stuff your'e doing keep up the good work

[rbsmontemor]

most likly not for its reserved for custom fixed speed costumer request

I'll try tomorrow and let you know

Rbs.

[rbsmontemor]

cat p/n: 3361P-1-103G same unit D5 uses

good find neighbour they are 15min drive away from me

3361.pdf

lead free solder info

Nice, you can try it too

Rbs.

[Martinm210]

Hehe..

Sorry, this one is beyond my abilities. If you need audio/video or a subwoofer enclosure design I can help you, but trying to completely understand the circuit and restistance needed is something for one of our many electronics gurus on the board.


I would have dug a little deeper and looked at the other side of the board, but it looks to me like the motor winding and all of the other side is glued in place.

I'm all for the name of science, but I only had two pumps at the time that were part of my system.

The mod is probably very easy, it's just something an electrician or electrical engineer needs to figure out.

I can calculate the pressure drop of the pump mod if you'd like...