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Higher compression ratio in an s3?

Discussion in 'A3/S3 Forum (8L Chassis)' started by ian52, Dec 7, 2011.

  1. ian52
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    ian52 2000 a4 1.8tqs-yellow

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    [Dec 7, 2011]
    Basically im running an ARY engine in my s3 instead of an APY engine so now i have 9.5 to 1 comp ratio instead of 9 to 1. Can anybody think of anything that i should be wary of or look out for running higher compression? I know i have 19mm wrist pins before anybody mentions that. Just thought i would check to make sure.
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Dec 7, 2011]
    High boost will be the biggest issue... high comp ratio, high boost, higher cylinder pressure, weaker rods...

    As you have had issues with boost (in a previous thread) then cap it with an MBC...

    <tuffty/>
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  4. ian52
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    ian52 2000 a4 1.8tqs-yellow

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    [Dec 7, 2011]
    Yeah,im just running it at 5 psi just now with the n75 unplugged. Getting a manual controller to plumb in with it off my mate to see how it goes. Im just running it on super unleaded too.
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  5. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Dec 7, 2011]
    Welly is running that compression ratio but he has the rods to take that pressure
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