Boxer RUMBLE(?!??)
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This is a discussion on Boxer RUMBLE(?!??) within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have WRX with cat back and HKS BOV. I have about 2000 miles on them. My engine seems like ...

  1. #1
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    Boxer RUMBLE(?!??)

    I have WRX with cat back and HKS BOV.
    I have about 2000 miles on them.
    My engine seems like it shakes A LOT....is it normal? I mean does everyone else's car shakes a lot too?
    Thanks for your help.

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  3. #2
    Registered User Nexus6's Avatar
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    My car shakes, Im sure all of our cars shake. I woudnt say a lot but its noticeable.
    La Fee Verte
    Subaru 2002 Impreza WRX Sedan

  4. #3
    Registered User gryphon's Avatar
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    The boxer engine by design (especially the four cylinders) shake, moreso at idle. Irvine Subaru sells a pitch bar (attaches to the engine and firewall) to reduce flex under load, and there are also STi mounts for the engine and tranny that will help reduce the engine vibrations (basically transferring them to the cabin )

    Those SHOULD reduce vibration while helping keep the actual power where it should be.... to the wheels!

    Irvine's prices right now (special I-Club price, so mention it when/if you buy) is $150 for the engine/tranny mounts and $50 for the pitch bar. I'm very tempted to get them!!
    2002 Subaru Impreza WRX
    Midnight Black Pearl

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    I see~~

    I see.
    I feel alot of shake when the car in on idle, but when I'm driving...I don't feel much at all. I think I'll get the pitch bar, due to my financial problem... I don't have much money.
    Thanks for the replies, I really appreciate it.

  6. #5
    Registered User JMRQ's Avatar
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    I've got 250 miles on my new 2004 WRX. I've been breaking it in just fine. It idles fine, but every 15-30 seconds the car will twitch a bit. Its something I just noticed and I thought I would ask. Is noticeable rumbling common among WRXs?

  7. #6
    Banned dark_rex's Avatar
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    Originally posted by JMRQ
    I've got 250 miles on my new 2004 WRX. I've been breaking it in just fine. It idles fine, but every 15-30 seconds the car will twitch a bit. Its something I just noticed and I thought I would ask. Is noticeable rumbling common among WRXs?
    completely normal. the boxer engine is situated low, and further back than most car engines. this is part of the benefit of the design, it's a lower center of gravity, and it's actually back pretty far b/w the front wheels, where a typical v4 or 6 is much further in front of the axles.

    the result is the cabin is much closer to the engine, and a lot of that vibration is right under you. also, the firing pattern of the boxer produces an irregular exhaust pulse through the headers. this accounts for a shake, and that notorious boxer rumble.

    those pulses (w/o an uppipe cat) help spool you up a lot faster though.

    dR

  8. #7
    Registered User Shard's Avatar
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    Originally posted by dark_rex
    ... a typical v4 ...
    ...

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