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Dual Pump Assembly Pressure Testing and Engineering Change Process (ECP) for the Dual Pump Quick Spool kit Installation!

For those of you who have been lucky enough to have received a dual pump quick spool kit we have an engineering update for you brought to you by our friends at Speedfactory Racing who have provided us some independent testing on the fluid dynamics of the Dual Pump Differential! A while ago we received some support from “James Kempf” of Speedfactory Racing who was able to provide us some much needed information on the stock flowing capabilities and pressure for the stock dual pump assembly and modified ones! This information is to aid in providing more performance attributes to the dual pump assembly and increase clamping load to the differential clutch assembly!

James Kempf performing a baseline pressure test of the Honda Dual Pump Assembly using pneumatics and a sealed dual pump piston assembly.

The initial baseline testing revealed a 60.53 psi pressure generated through the clutch piston assembly that would typically be supplied to the piston assembly to engage and disengage the clutches. This is the base pressure from Honda generated using an inline pressure sensor drilled through the dual pump piston assembly and supplied through the oil seals on the primary pump!

Upgraded Quick Spool Springs Installed

With the Quick Spool kit installed James went for another test this time revealing 78.30 PSI worth of pressure generated by the pump thus increasing the hydraulic pressure generated to move the piston assembly and engage the clutches. Again this testing was done with pneumatics and a pressure sensor drilled through a sealed dual pump piston assembly.

With this above mentioned configuration James was able to see a dramatic increase in performance on his Turbo Honda CR-V project after the Racing Diffs Clutches were broken in correctly. However where we made our mistake was including the instructions of drilling out the oil orifices in the CR-V Differential Dual Pump assembly so this engineering change should dramatically increase performance full spectrum and allow much needed oil pressure to be supplied to the differential clutch assembly.

Oil Orifices Drilled to 1/8th” Pressure Testing

With Oil Orifices drilled to 1/8th” and the upgraded springs installed this revealed a 3.71 PSI pressure generated by the dual pump assembly using pneumatics. “Do not drill out the Oil Orifices !” However everyone knows oil is heavier than air and these pressure are done independently using pneumatics and pressure could very slightly but this engineering change allows for the best performance overall. Our instructions covered the removal and drilling of the orifices and will be revised to include this engineering change. Thank you all and we apologise for any inconvenience!

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