External Oil Pump

[Chip42]

Greg Amy: My reasoning for the external oil pump is that the stock pump does not have factory or aftermarket gears available that will increase volume and pressure. While there are means to adjust the pressure nothing available for volume increase unless an external single/two stage pump is allowed. This is for a mid engine Toyota.

Rudy, as you should already know, on our ITB MR2s we run a stock update (15100-19036 PN, which is the later PN replacing ...35 number. earlier pumps were 15100-19025 replaced by ...26 and are superseded by 35/36 units) which uses the round-tooth style rotor rather than the sharp tooth and bridge style the 4AGE came with before the update. this pump maintains the same pressure but moves a LOT more volume AND is less prone to failure due to reduction in sharp edge stress risers. in our IT cars we run through -12AN hose to a front-mounted LARGE oil cooler (19-34 row, depending on car) and back to a remote filter (I use WIX 51515R which take a qt of oil to fill) and then back to the OEM filter inlet via adapter plate (get the Earls or CM mounts, the rest have a ford-sized O-Ring and will leak) via -10AN hose, teeing to an Accusump on the way.

no shim in the pump (not legal in IT) I see 60+ PSIG in the block after all of that. we spin upwards of 9k RPM when needed, usually only to ~8200. you don't need an aftermarket pump.

the updated pumps are marked on the exterior "AISIN 2" older pumps just "AISIN"

BTW - this pump is the same PN used in the 20V (pre-hydraulic tensioner) and 2UZ-FE V8.