GM Stage Two Performance For The Supercharged LSJ Ecotec - Power Up

The Stage Two performance upgrade kit for the supercharged Ecotec 2.0 liter engine (RPO LSJ) consists of four high-flow fuel injectors, a smaller diameter pulley and properly-sized belt, and a dealer installed 'calibration' to unleash the newfound power.

These are all the tools you'll need to install the Stage Two performance upgrade kit: a small flat screwdriver, 1/4-inch and 3/8-inch ratchets and extensions, various sockets (10mm, 14mm deepwell, T30 Torx) and some open-end wrenches (8-, 10-, 21- and 24mm). An 'lb-in' torque wrench is needed to install all the fasteners on the Stage Two kit as every fastener that needs to be reinstalled on the vehicle should be torqued to 89 lb-in or 18 lb-ft.

To begin, remove the relay controlling the fuel pump from the fuse block. The fuel pump relay is located towards the rear of the fuse block. Then, start the engine and idle it until it stumbles, then shut it off. Reinstall the fuel relay in the fuse block and move to the trunk to disconnect the negative battery cable (10mm nut) from the battery. Let the engine cool off before beginning your work.

Unbolt the two T30 Torx screws holding the engine cover and remove the 10mm bolts on two brackets holding the fuel line onto the engine. Then loosen the 24mm fuel line nut with a 21mm open-end wrench situated on the fuel rail anchor nut (shown) with a rag under the fuel line fitting for fuel leakage. Remove the temperature sender and coolant steam pipe also.

After pivoting the fuel line off the front of the engine and laying it on the driver side of the engine bay, blow off and/or vacuum the top of the engine to remove any debris. Pull the fuel rail/fuel injector assembly out of the cylinder head. This should require minimal force. Make sure the fuel injector plastic 'inserts' stay in the cylinder head. If the inserts come out, reinstall them into the head after wiping a light coat of the Vaseline you keep handy on the O-ring seal.

Remove the air inlet tube attached to the throttle body on the blower by loosening the 8mm hose clamp bolts and sliding it off.

Now, remove the many electrical and hose connections on the blower. These will include the MAP sensor (shown), brake booster hose, evap purge line, boost control vacuum hose and intercooler reservoir bracket. These will all need to be hooked up after the blower is reinstalled.

Remove the four 10mm bolts holding the throttle body and gasket on the blower. Pivot the throttle body away from the blower to allow blower removal.

Relax the blower belt tensioner with a 15mm wrench and remove front drive belt by hand.