Quote:
Originally Posted by alex87f
Looking back at when the 86 was released, everybody thought the WRX FA20DIT would be to go-to performance swap for our cars. Seven years later, and -AFAIK- nobody's got it to work properly.
These FA24s might very well be the same story. Can it be done? Of course. Does it make any sense vs. a low-boost supercharger kit that's known to work? Probably not.
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People have done the FA20F swap, but it is an inferior engine, so there is no reason to swap the motor. It has lower compression, so it can take more boost on pump gas, but it takes more boost to make power. The rods are only slightly stronger, but generally, 350hp is around the max target. The turbo system is mounted under the engine, so there is likely some type of interference issues unless the engine is mounted higher. It might require an aftermarket turbo system anyways. Then the starter is on the opposite side of the engine, so I think some custom work would need to be done to mount the transmission. It makes more sense to just install an aftermarket turbo system, so this is why swaps aren't common.
For the FA24, there is more low end torque, there will be more power potential, it likely has stronger internals for more reliability at a given horsepower or a higher power potential, it will spool a turbo faster, etc. The cost of a swap could be cheaper than building a piston/rods motor FA20, and it might have an improved power curve.
If the motor has the same dimensions, but is just bored out larger, or rather, it has larger sleeves then the block might possibly be matted to the FA20's heads with some minimal head work to open the chambers. We don't know yet.