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TMonte · 01-17-2006, 10:48 PM

Hi bigben,

Interesting. I did some more digging after you pointed me to that graph, and found that the measured flow through the Swiftech G4 with an MCP655 (aka D5 as you know) was 87GPH or 1.45GPM using 12v, at setting 5.

So...I did some rough math and came up with this, which seems to jive with the ProCooling graph:

Code:

S  RPM    Est. flow rate (GPM)
1: 1800   0.53
2: 2550   0.76
3: 3300   0.99
4: 4050   1.22
5: 4800   1.45

(RPM figures assume the pot control is linear, min & max figures are from published data)

Which means the difference between 3 and 5 @ 12v is approximately 0.75C, according to the ProCooling data.

Thanks! That helped a lot! I figure a ~40% drop in RPM from where I am now (calculated as ~5300 RPM @ 13.4v) should net a large drop in noise and still deliver excellent performance. We'll see how it works in the real world.

I'm excited.

Tom

01-17-2006, 10:48 PM	#3
TMonte Cooling Neophyte Join Date: Dec 2005 Location: New Jersey, USA Posts: 14	Re: Laing D5 noise and speed adjustment Hi bigben, Interesting. I did some more digging after you pointed me to that graph, and found that the measured flow through the Swiftech G4 with an MCP655 (aka D5 as you know) was 87GPH or 1.45GPM using 12v, at setting 5. So...I did some rough math and came up with this, which seems to jive with the ProCooling graph: Code: S RPM Est. flow rate (GPM) 1: 1800 0.53 2: 2550 0.76 3: 3300 0.99 4: 4050 1.22 5: 4800 1.45 (RPM figures assume the pot control is linear, min & max figures are from published data) Which means the difference between 3 and 5 @ 12v is approximately 0.75C, according to the ProCooling data. Thanks! That helped a lot! I figure a ~40% drop in RPM from where I am now (calculated as ~5300 RPM @ 13.4v) should net a large drop in noise and still deliver excellent performance. We'll see how it works in the real world. I'm excited. Tom