@ Malik, Was the pump voltage the same for all testing?...and exactly which DDC were you using?

Quote Originally Posted by hellcamino View Post
Depending on impeller design I would think the motor would slow with restriction unless it would just cavitate beyond a certain amount of restriction. Where and how in your loop were you creating the restriction WL?
Waterlogged's Whacked Out Lab!

I busted my video/Youtube cherry for ya.

Quote Originally Posted by SNiiPE_DoGG View Post
my ddc 3.2's spin at RPM's 300 apart, one ~4400 one ~4100
SNiiPE, not every pump is going to read the same. I figure the RPM sensor has probably ±10% accuracy. The thing I'm talking about (that's shown in the vid), is once to pump starts, it's going to show you pretty much the same RPM's regardless of how you try to restrict the flow. The only way the RPM's will vary on the DDC 3.x like they do on a DDC-2, is if you play with the voltage. I've got 2 DDC 3.1's (just need to solder them) here that I'll check against the DDC 3.2 probably sometime tomorrow to try and varify some kind of RPM range.