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!
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!