| PERRIN Front Mount Intercooler: 2008+ WRX & STI
PSP-ENG-435 Fits all WRX models 08+ H/B and Sedan
PSP-ENG-430 Fits all STI Models 08+
The process of compressing incoming air to create boost and power also has a nasty byproduct of heat. Heated air lacks the density to make higher horsepower, increases detonation and forces the ECU to pull timing. All of which reduce the power you are looking to create.
Easy solutions do exist for this problem and PERRIN™ offers several choices for your vehicle and personal taste. For mild modifications and a stealthy look turn to our Top Mount Intercooler upgrades, available for Impreza, Forester, and Legacy models. These bar and plate cores offer more surface area per square inch than cheap tube and fin choices from our less worthy competitors and the overall size is more than 200% of the OEM unit! But Top Mount Intercoolers do suffer from underhood heat buildup and while excellent for mild performance gains the Front Mounts are the ideal choice for all out, bar none HP gains!
Enter the PERRIN™ Front Mount Intercooler upgrades. With gargantuan cores, cast endtanks, high velocity tubing and proper mounting supports, there simply isn’t a better choice for your car, period. These intercoolers will support more than 1000 HP and due to our stringent quality control process have less than 1/4 psi drop across the core at 20 psi., improving throttle response and putting the boost where it belongs in the the combustion chamber!
Intercooler Core
The most important part of any intercooler system is the core. The core is what is doing all the work. The core is like a radiator for the charge air. The turbo heats up air as it creates boost, and this super heated air is not good for power. Hot air isn’t good as it is less dense that cold air, and the heated charge can cause detonation. This is where an intercooler comes into play. As the hot air passes through this glorified radiator, ambient air temp/flow cools the charge. But how well the charge is cooled is controlled by the size of the core, and how quickly the air flows through it. Also the pressure drop is important as if a core is very restrictive and has a high pressure drop, you are loosing power.
The factory Intercooler is a tube and fin design which is great for being light weight, and easy to manufacture, but not good for performance. We feel the optimum core design is the 3/8” bar and plate style. This gives a 3/8” charge air and ambient air path, instead of the common 1/4” size, or smaller tube and fin style. Also the bar and plate core is much more durable than the tube and fin. This is something to consider since the intercooler will be on the front of the car, rocks and other debris will hit it. A tube and fin is very thin and can easily get damaged.
The factory Intercooler does an ok job of cooling air on a stock car, but start to modify it, and forget it. The PERRIN FMIC core is 28”long x 9.25” tall x 3.5”deep. This gives you a volume of 906.5 cu-in. The stock core is 7”long x 18.5”tall x 3”thick giving it a volume of 388.5 cu-in. The volume is a great way to get an idea how well the intercooler will do both in both flow, and cooling. Generally bigger is better, to a point. Too thick and you start to loose cooling efficiency. Our FMIC core is the best overall for cooling, pressure drop, and looks. Because of its size, it fills the opening of the WRX/STI bumper very well!
Endtanks
The endtanks to an intercooler are also very important. They control the dispersal of air across the intercooler core. A properly designed end tank will allow for near perfect distribution of the hot air across the core and the PERRIN tanks are design that way. With a smoother gradual taper from top to bottom, and with no 90 degree corners, our cast aluminum tanks will ensure that hot air get across the entire core. Built into each tank is an innovative bracket that contains the intercooler support beam. This allows for a simple yet strong connection of the intercooler to the chassis.
Intercooler Support Beam
Our Intercooler support beam is made from steel and is futher powder coated to ensure a long rust free life. Because the installation of the PERRIN Front Mounted Intercooler requires the OEM bumper beam to be removed, we choose to make our replace part out of steel. This is in contrast to some competitors that use aluminum in favor of saving a little bit of weight. We feel that some safety factor is important when removing the front bumper beam. We have not crash tested this part, nor do we say it is, but having something stronger than a tin can, should make you feel a little safer.
Boost Tube Routing
The beginning and ending points of all Front Mounted Intercoolers are the same. The turbo and throttle body are always in the same place but getting to these points are where all intercoolers vary. We choose to take the smoothest shortest path to get to the intercooler. Right off the turbo a smooth offset coupler, and a perfectly matched 2.25” tube travels in the engine bay next to the battery, and down behind the radiator to the intercooler. We chose this size to make for smoother cleaner, clearance free routing and still large enough to flow more WHP than a GT4088R can put out. The cold side of the intercooler travels smoothly to the throttle body through the engine bay. The tube is mounted as high as possible to ensure it clears all turbo and intake combinations possible.
Boost Tubes
The boost tubes are CNC mandrel bent aluminum tubing. You have your choice of polished or powder coated finish. We choose not to use Stainless steel tubing as this is heavy and there is no need for the added strength. Every boost tube has an oversized bead on the end. This small detail helps ensure the hose clamps and couplers stay connected and sealed!
T-Bolt Clamps
Yet another benefit from PERRIN! No more std. type clamps. Each T-bolt clamp is designed for uniform clamping at all points around the band, vs one pressure point with conventional clamps. The wider band distributes the force over a larger area. Fine threaded bolt section and nylon lock nut allow for accurate torque and proper clamping overtime. No reason to re-tighten down the road. Plus each PERRIN logoed clamp is made in the USA and has the torque spec engraved on each one. Advantage PERRIN!
Weight
With all of these parts installed, the one thing people don’t think about is weight. If you take all the parts you removed and compare them to the PERRIN parts you are installing, you will find you only added 9lbs! This is great as many of the autocrossers and weekend racers
Blow-Off Valve
Included with every PERRIN FMIC is a blow off valve flange that allows the use of the stock BOV to be used. This doesn’t force the end used to use a BOV they don’t want, or force them to buy a BOV for their new FMIC. Another neat feature is the flange connects to the boost tube using a silicone coupler. The size of this coupler fits many aftermarket BOV’s including ours. This makes for a very clean BOV installation of aftermarket BOV’s.
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