2010 Subaru STi Hatch Project | AWD Monster Without a Heart!

We continue from last week’s article about the 2010 Impreza STi Hatchback project!

Below is part two of our three part series covering every facet of this 2010 Subaru STi Hatch project!

2010 subaru sti hatch build

Last week we gave you a little background information about the build and told you why the car is here at MAPerformance for some treatment. This week, we’ll talk about exactly what’s in store for the Subaru, and get into some of the motor-swapping goodness!

As noted in the last post, the car was seeing a ton of track time and the engine was getting pretty worn out. The result was a blown head gasket and a very frustrated owner. Jeremy needed to source out his options, and MAPerformance was the solution. After a quick phone exchange with Ian, it was concluded that a Stage 3 sleeved short block was just what he needed. The car was transported to our shop here in Cottage Grove and dis-assembly began.

Chris, one of our resident shop technicians was tasked with removing the engine from the car since he is most familiar with the process. Just a few hours later, we had a naked Subaru STi engine bay! Props to Chris for his quick work. With the engine out, it was time to get onto the next stage of this build: the motor work!

Teardown was smooth, and the proper inspection was done to ensure the block was still usable. Despite the head gasket being blown, the engine was still very clean and able to be reused for the build. Furtermore, it showed no additional signs of wear, furthering the belief that Subaru WRX engines are capable of holding additional power (just not the head gaskets!). After disassembly, we cleaned the block and sent it to our shop for sleeving before bringing it back for reassembly! We were returned a thing of beauty!

With the motor back in the shop, it was time to start putting this bad-boy back together. Our talented team of engine builders assembled the block with a recipe that has been proven for power. Included were JE Pistons with Manley Turbo Tuff I-Beam Rods, and a stock crankshaft. Once we had the engine block halves assembled, she posed for a few pics while the builders moved onto the cylinder heads.

The cylinder heads were sent off to our porting expert, Dave, to be given a stage 3 head preparation. The stage 3 service includes cleaning and hot tanking, along with visual inspection before being sent off for deck resurfacing and 5 angle valve job, and finishing with a port and polish. After these services were performed, each head was rebuilt using GSC Stage 1 Camshafts, Supertech Valves, GSC Valve Springs, and topped off with Injector Dynamics 1000cc Fuel Injectors. Pretty cool to see them all neat and fresh!

With everything reassembled, we bolted the heads up to the block, installed a high-capacity oil pan, and got a few more pictures before the engine saw it’s way back into the car. Check out that Moroso oil pan!


OmniPower 4 Bar MAP Sensor


Click here to get your Omnipower Sensor


Click image to get yours today

Why do you need an upgraded MAP Sensor? Well it is fairly easy to max out a stock sensor. the stock sensor is also slow, and once you start modifying your engine this upgrade is a must.

These sensors are very durable and compatible with all aftermarket engine management systems. Cases are designed to withstand in excess of 130 PSI without leaking. AND will operate in extreme temperatures from -40 to 260 degrees fahrenheit. It is also the fastest responding sensor on the market with the ability to respond from 10% of the pressure scale to 90% of the pressure scale in a thousandth of a second.

Omni Power USA MAP (Manifold Absolute Pressure) sensors use state of the art circuitry with thin film resistor networks built into each micro chip.

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Oil Cooler Kit by MAPerformance | Unbox

Cool off your Scion FRS & Subaru BRZ

Click here to get yours now!


Click the image to order

The BRZ/FRS FA20 tends to run hot under load in stock form, thus modified vehicles with increased output are even more susceptible to the adverse affects of high oil temperatures. Extend oil life and protect your investment from oil oxidation and thermal breakdown with an FA20 oil cooler kit from MAP.

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COBB 20G-8 Turbocharger for your 2008-2012 Subaru STI

COBB 20G-8 Turbocharger

COBB 20G-8 Turbocharger

Click image above to BUY IT NOW!

20G-8 Turbocharger

The COBB TD05H-20G-8 is an ideal turbo upgrade for those looking to increase the top-end power of their STI while maintaining low and mid-range response. Capable of producing 400hp and retaining excellent throttle response, the COBB 20G is a perfect turbocharger for street or track use! Continue reading

3-port Electronic Boost Control Solenoid

From Grimmspeed for the Mitsubishi Evo X

Click here to get your EBCS


Click image to get yours today

The GrimmSpeed 3 port is designed to work with your factory computer. Although keep in mind it does require tuning. It will not reduce the life of your factory computer because it is designed to draw the same amount of power as the factory boost control sensor but flows better and reacts faster.
It plugs in with ease and requires no splicing or soldering of resistors. With the included bracket you can bolt it in, plug in the connector, and start tuning for fast boost response, increased boost pressure and free up lots of power. Planning on returning the car to stock? Simply reverse the installation process.

Why run and Electronic EBCS instead of a manual boost controller?

With a MBC, you have very limited control and are forced to run a fixed boost through the entire rev range.

Why is this bad?

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