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Thread: FB25 engine to power FT86

  1. #1
    Senior Member 4.5AG's Avatar
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    Default FB25 engine to power FT86

    In non-turbocharged models, a new engine (designated FB25) sits under the hood. It has the first completely new design from Subaru in 20 years.

    Subaru had a number of goals for FB25, including improved fuel economy and higher performance, especially at low engine speeds (low-end torque). Major differences between the FB25 and the EJ25 (which remains the engine of choice for turbocharged Forester models) include:

    Smaller bore and longer stroke
    Slightly higher displacement
    Chain-driven double-overhead camshafts instead of belt-driven single-overhead camshafts
    Compared with the previous non-turbocharged EJ25 engine, the FB25 produces:

    Same horsepower, but at lower rpm
    Slightly higher torque at lower rpm
    Improved fuel economy


    Does that mean that the"F" on FT 86 stands for FB25?

  2. #2
    Gunner
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    it'll have direct injection

  3. #3
    Gunner
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    I was wrong, it looks to be a 4 banger version of the EZ30, which isnt a bad thing.

    Just hope they keep some sort of EJ variant in the years to come, otherwise no easy mods for anyone for long time.

  4. #4
    Senior Member Moebius's Avatar
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    Why the switch to a timing chain instead of belt? What's the advantage there?

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    they don't need to be replaced and make a cool rattling noise. i'd imagine subaru owners would be quite happy to never have to replace a timing belt on those stupid VW motors.

  6. #6
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    great, so not only is it a epic cross bread on a old chassis, it now has a lovely truck motor! it just keeps getting better and better!

  7. #7
    Senior Member 4.5AG's Avatar
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    EZ30 timing chained boxer engines are one of the smoothest and reliable engines.

  8. #8
    Gunner
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    and sound absolutley porn

    heres one i prepared earlier




    I put this together while I was at Pulse Racing, would have to be one of my all time favourite subaru's that I have worked on, beautiful seamless power, from idle to redline. Ended up with near on 300kw on 12psi with standard internals.

  9. #9
    Senior Member 4.5AG's Avatar
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    Sounds like a 911...

  10. #10
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