Saturday, January 4, 2014

LS3 Accessory Drive kit

My LS3 engine is a crate motor, which means it came complete with intake, throttle body, coil packs etc, but does not come with the accessory drive as this is typically chosen to suit the vehicle. The same crate motor is used in HSV, Camaro, Corvette, Cadillac etc, so the accessory drive components and brackets vary by vehicle. The accessory drive is made up of alternator, power steering pump, idler pulley, belt tensioner and belt, brackets and bolts etc. I am using GMPP part number 19299070, which is the setup used in Cadillac CTS-V LS3.

This setup is narrower than the Australian HSV setups and will fit nicely between the inner guards of the Cobra. The accessory drive kit 19299070 includes alternator, power steering pump, pulley, tensioner, belt and all brackets and bolts needed to bolt it straight onto the LS3.

All the components laid out that form the one GMPP part number
The front of the LS3 before install
The install instructions include torque specifications for all bolts for which I used my Snap-On digital torque wrench
And used anti-seize on all bolts
Everything bolted straight on in no time. The supplied plastic power steering reservoir is not very nice looking, and I will replace this with a black aluminium billet reservoir. Fitting the power steering pump necessitated removing the front-left engine lift bracket, so that will need to be swapped back for engine installation and then the pump can go back on when the engine is in the car. The pump has to come off anyway to be modified, read below for why.
These newer GM alternators do not use an exciter wire, they are controlled by the ECU. The engine loom I have is a modified VZ Commodore loom and the pigtail does not match the alternator socket, but not to worry my loom supplier sideshow has already sent me the correct pigtail to match the alternator.
The power steering pump is going to need some modification. I will be using -6 AN fittings and Teflon hose for the power steering lines, for which I need an adapter fitted to the power steering pump high-pressure output. Such an adapter M16/-6 AN is easily sourced, but there's a problem in that there is minimal clearance at the back of the pulley to fit the adapter and then fit an AN hose-end in there. The solution comes from Detroit Speed and is a custom fitting designed to completely replace the factory outlet fitting but the Detroit Speed fitting is made with a -6 AN end, part number 090401. This will allow a -6 AN hose-end to fit in there with much more room.
The pump is as fitted to the Cadillac CTS-V, and will supply 2 gallons per minute @ 1640/1740 PSI, which is too high a pressure for the VP Commodore steering rack that I have. So I will send the pump to a power steering specialist and have them re-valve it and test to a more appropriate pressure of 1200psi.

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