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Old 06-03-2020, 09:51 PM   #21
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Member#: 90539
Join Date: Jul 2005
Chapter/Region: South East
Location: SWLA
My BOV goes


Originally Posted by carnz-pj-410 View Post
Yeah i've determined i have a flow issue with my pumps that is causing my limitations.

A buddy with a larger built setup than mine made 840 wheel on the same dyno with ID2000s, so we are going to dig into it
If you split the oem wire on the hanger for both pumps and are still using the oem connector on top, you may be losing a lot of voltage. The oem ground for the pumps goes all the way to under the passenger front seat on my old impreza, and if yours is also there you can lose a lot. The oem pins for the hanger connector are very tiny and won't handle much pump current. Also factor in that there are two sets of contacts the power has to run through for the connector...the ones outside the hanger and the ones where the pump harness in the tank plug in to the hanger. You could also consider the connectors at the pump, but most people probably aren't going to solder them for risk of warranty denial.

On my modded oem hanger I have an aftermarket connector also added and have both the oem two wires and the ones from the other connector going to the same pump. I originally was going to use the 400 pump and it draws a good bit over stock, but ended up with a 300 for now the hanger is major overkill.

-Is your hanger running on the oem speed controller or straight from a relay with a dedicated thick wire from the battery?

-I'd also recommend running two of the same pump if they are paralleled on the hanger. Someone may chime in saying they believe it's fine, but something about two pumps with different flow and relief valve pressure worries me. Also one pump may have a check valve with the other not. Something to check into.

Either way, seeing several people running two pumps has convinced me to buy another (hnnnhghhhhhh) DW400 to install in the surge tank. Two will surely get rid of my only limitation. May as well make full use of the 2000cc injectors!
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