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Forced Performance (FP) has been one of the biggest names in bolt on turbochargers for well over a decade, especially in the 4 Cylinder market such as Mitsubishi Evo and Subaru WRX. The FP Green for example has been pushing the limits of what a stock position turbo can offer and setting the bar for a lot of other turbocharger brands to compete with. FP offer an optional 84mm Flow Advancement Port compressor housing to further push these turbo’s performance.
For Subaru owners, FP turbos with the 84mm compressor covers are notoriously difficult to fit. In order to bolt up to the factory down-pipe the turbo has to be positioned perfectly while still allowing clearance under the intake manifold and the engine block. This makes installing the turbo inlet hose very hard as the compressor inlet sits behind the TGV housing.
Fortunately, the installation of the FP 84mm turbos has been made much easier with the release of the Killer B aluminium turbo inlet pipe. Killer B offer an optional coupler that adapts the inlet pipe to the 84mm compressor cover and is made from an extremely flexible silicone material allowing you to squeeze it between the turbo and TGV housing.
Other Challenges
With the inlet hose being taken care of however there are still other challenges to overcome when installing this turbo. A small amount of material will need to be removed from the engine block to allow the compressor cover to clear. This can be accomplished with a small amount of grinding with a dremel. This amount will vary from car to car but oftern only a few mm is required.
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Aftermarket TGVs are a must to allow enough clearance for the silicone coupler, but also more importantly to allow the additional air flow to enter the engine effectively. Additionally, using phenolic spacers to raise the intake manifold is also a must as the coolant hose sits quite high above the compressor housing due to its size.
Finally, due to the huge air flow capabilities of these turbochargers they are offered in externally wastegated configurations to allow for accurate and effective boost control.
Is it all worth it? A small search on the internet will find numerous examples of WRX and STI models making huge power with FP turbos. Some vehicles have been observed running low 10-second quarter mile runs with FP green turbos. This can all easily be achieved with a large universal turbo and a rotated turbo setup but that is not an option for a lot of us without access to fabrication services. The FP range of turbos offer massive performance while still allowing the use of off-the-shelf front mount intercooler kits and exhaust systems, requiring no custom fabrication.
See below for all FP turbos currently in stock as well as options for all the required parts to install them. For any other questions please contact us today.
