Description

Subaru IMPREZA WRX, IMPREZA WRX STI 2011 Service Manual

If you’re trying to keep a Subaru IMPREZA WRX, IMPREZA WRX STI 2011 Service Manual on your workbench is the answer. 3350 pages of factory documentation, not a reprint or a third-party hack job. You get the exact tightening torque for every fastener, the oil capacity in quarts, the valve clearance specs in thousandths of an inch. No guesswork. No wasted time searching forums for the right number.

I’ve seen techs strip head bolts on these EJ engines because they used a generic torque chart from the internet. That’s a $2,000 mistake. This manual came from Subaru’s engineering department. It tells you the sequence and the angle for the cylinder head bolts, the wastegate control solenoid valve test procedure, and the SI-DRIVE system diagnostic steps. Page 73 (if you need the charge pressure for the turbo) — it’s in the INTAKE INDUCTION section. Every spec is in imperial units, because this is North America and we don’t work in metric for torque unless the fastener calls for it.

Subaru IMPREZA WRX STI 2011 Service Manual: Engine Mechanical Specifications

Under the MECHANICAL ME(STI) section, you get compression test specs, idle speed, ignition timing, intake manifold vacuum, oil pressure, fuel pressure. Then it goes into engine assembly, timing belt replacement with the correct tensioner setup, cylinder head removal and overhaul. The manual shows you the selective parts, sealing points, and locations for grease. If you’re rebuilding the short block, the piston ring end gap and bearing clearance specs are listed there. Don’t trust a third-party manual for these numbers — I’ve seen them off by 0.002 inch. That’s enough to spin a bearing.

What Torque Specs Are Listed in the Periodic Maintenance Section?

Every fluid change interval — engine oil, transmission gear oil, front and rear differential gear oil, brake fluid, coolant — with the exact capacity and type. Spark plug gap, V-belt tension, timing belt replacement trigger. The PRE-DELIVERY INSPECTION and PERIODIC MAINTENANCE SERVICES section (starts after the Foreword) lists the schedule and procedures. A/C filter replacement is in there too. If you’re doing a full service, you don’t need to flip between separate books. It’s all here.

Fuel Injection System and SI-DRIVE: Factory Diagnostics

The FUEL INJECTION FUEL SYSTEMS FU(STI) chapter covers throttle body, intake manifold, all sensors — coolant temp, crank position, cam position, knock, throttle position, MAF, MAP. It includes the Tumble Generator Valve Assembly, which is unique to the STI. The SI-DRIVE system, fuel pump control unit, and the Electronic Throttle Control relay. For diagnostics, the manual gives you the resistance values and voltage readings at the ECM connector. If you’re chasing a misfire or a lean code, you need these specs. Aftermarket manuals often omit the pinout diagrams or give you a generic one. This one has them.

3 Reasons to Choose OEM Factory Documentation

1. The specifications are from Subaru’s engineering — not compiled from a Chilton or Haynes writer’s interpretation.
2. Every tightening torque value is verified. I’ve torqued enough heads to know that 54 ft-lbs is not the same as 55 ft-lbs on a 10mm stud.
3. Safety warnings are embedded in the procedures. The manual defines Note, Caution, and Warning — and they’re applied where they matter.

Compare that to a $40 aftermarket manual that tells you “use proper torque” but doesn’t list the number. Waste of shelf space.

Turbocharger, Intercooler, and Induction: What the INTAKE INDUCTION Section Covers

The IN(STI) section includes the air cleaner element, case, intake duct, intercooler, turbocharger, air by-pass valve, resonator chamber. If you’re replacing the turbo, the manual shows you the oil feed and drain line torque, the coolant line connections, and the wastegate actuator adjustment. The air by-pass valve is a common failure point on boosted Subarus — the manual gives you the vacuum test procedure. No need to guess if it’s leaking. Also covers the intercooler removal and cleaning spec.

Additional Documentation: Related Manuals

If you own an earlier model year, check out the Subaru IMPREZA WRX STI 2008 Service Manual – OEM Factory Specs. For the 2012 version, there’s the Subaru IMPREZA WRX STI 2012 Service Manual – 3356 Pages of Factory Specs. If you work on Legacy models, the 2005 Subaru LEGACY Service Manual – Factory Specs, 4596 Pages is also in our collection. For broader industry context, the Automotive Industry Overview and Automotive Industry Overview are useful for understanding OEM documentation standards, but they don’t replace the specific manual you need.

Frequently Asked Questions

Does this manual cover the 2011 STI sedan and hatchback?

Yes. The foreword lists applicable models: GVE, GVF, GHE, GRF chassis. That covers both sedan and hatch for WRX and STI.

What torque specs are included for the cylinder head?

The MECHANICAL section has the tightening sequence and torque for the cylinder head bolts. It’s a multi-step process with angle tightening. You need the manual open on the bench.

Can I use this for a 2010 Impreza WRX?

No. This is specifically for the 2011 model year. The 2010 has different ECU calibrations and some sensor differences. Get the correct year.

Are wiring diagrams included in the 3350 pages?

Yes. The manual includes detailed wiring diagrams for the fuel injection system, engine control module, SI-DRIVE, and all sensors. They’re in the FUEL INJECTION and ENGINE sections. If you’re tracing a no-start issue, you need these diagrams. They show connector views and pin numbers. Aftermarket manuals often simplify the wiring to the point of being useless. This one does not. Every wire color and connector location is factory-accurate. You’ll find the diagrams after the component descriptions, with notes on inspection procedures before and after maintenance. Page references guide you to the relevant component section for each harness. The diagrams are in the PDF with bookmarks, so you can jump directly to the section. This manual’s 3350 pages include all harness routing and connector locations. Don’t waste an afternoon guessing which wire is the crank signal — look it up here.

Bottom line: If you’re working on a 2011 Subaru IMPREZA WRX or STI, this factory Service Manual is what you need on the lift. It’s 3350 pages of verified data, from the company that built the car. Access the Factory Manual.