On that note, we are extremely excited to announce the release of the all new COBB Front Mount Intercooler Kit for the 2011-2014 Subaru STI. This is a kit that has been in the works for quite some time, and the fit and finish would indicate so. Primarily aimed towards vehicles with upgraded stock location turbochargers such as the COBB TD05 20G, this intercooler kit significantly increases the potential power output of the STI. We’ve also released an additional Subaru Universal Bypass Valve which is included in our Front Mount Intercooler Kit and is also compatible with others with 1″ BPV bungs.
That’s a very shiny piece of metal you have there, why do I need one?
Intercooler efficiency is defined as the ratio of the temperature removed from the charge air by the intercooler relative to how much temperature is put into the charge by the turbocharger. In this case, the factory top mount intercooler achieved around 74% efficiency during peak torque and dropped off to 60% by the 6700 RPM redline. In comparison, the COBB Front Mount Intercooler Kit is able to achieve well over a 90% efficiency rating throughout the entire pull.
So, what does all of that mean in the real world?
The graph above represents charge air temperature during a dyno pull before and after the intercooler for both the stock TMIC and the COBB FMIC. The top section represents pre-intercooler temperatures and the bottom section represents post-intercooler temperatures. Notice that the pre-intercooler temperatures follow each other almost exactly throughout the entire pull. Testing with the factory intercooler in place saw pre-intercooler temperatures reach 321.896°F and with the COBB FMIC installed pre-intercooler temperatures reached 326.06°F. This is where the aforementioned intercooler efficiency rating comes into play. The factory TMIC is able to cool the charge air by 144°F at the hottest point where the COBB FMIC Kit is able to reduce charge air temperatures by 225°F. In fact, throughout the entire pull temperatures only rise by 10°F. What this means is that the COBB FMIC is able to keep the air entering the engine significantly cooler which enables more aggressive tuning and higher power figures.
Remove the overworked factory intercooler from your STI in favor of the COBB Front Mount Intercooler Kit. Featuring a massive 30″ x 10.35″ x 3.5″ Bar and Plate core and 2.5″ piping, this kit is capable of supporting in excess of 800 whp. The piping is mandrel bent aluminum and finished in wrinkle black powder coat to keep the engine bay tidy. The COBB FMIC is designed to work with the COBB SF Intake and Airbox combination.
The COBB XLE BPV is a compact and lightweight by-pass valve that is capable of holding very high boost pressure without leaking. Its unique design allows for extremely fast venting of boost when actuated. Innovative engineering and precision manufacturing result in a compact package able to fit in the confines of a tight engine bay. The XLE BPV is able to vent pressurized air more quickly than other bypass valves due to several unique design elements. Due to the low weight of the components, the moving parts in the XLE BPV have less inertia and can respond faster than heavier components in other bypass valves. Furthermore, the shapes of the exhaust port and piston face are designed to evacuate air as quickly as possible. The third design element is treatment of the piston with hard anodizing and a Teflon coating that provides low sliding friction, reduces surface wear and minimizes maintenance requirements. This “Universal” valve is included with and designed to be used with the COBB Front Mount Intercooler Kit for the 2008-2014 Subaru STI. It can also be used in other configurations that call for a 1″ bypass valve inlet.