August 10, 200718 yr When I'm rough on the clutch I get a big thunk. This is particularly noticable when I step on the clutch pedal quickly in first gear. Is there something broken? Maybe a tranny mount?
August 10, 200718 yr Can you tell what area the thunk is coming from? I've drag raced a couple wrx and STi cars. They all have a thunk from the rear end when hitting gears.
August 10, 200718 yr Author Sounds like it's coming from the front, and it doesn't happen when engaging the clutch, just when I disengage it abruptly.
August 10, 200718 yr sounds like a motor mount, but could be other things. check the pitch rod device on the top of the motor as well, they can crack, though i've never heard of noises resulting from that. not sure of a good way to test motor mounts.
August 10, 200718 yr The mounts can visually look ok, but still be torn apart. I had a set of the round style that fell apart when I took out the motor on one of the legacy's. If you stand over the motor and rev it up manually, does it seem like the engine is twisting off the crossmember excessively? If you can get under the car you can inspect the tranny mount visually, and also jack it up some and see what the mount looks like when put under stress.
August 12, 200718 yr Author If you stand over the motor and rev it up manually, does it seem like the engine is twisting off the crossmember excessively? How much is excessive? I'm not sure I've ever looked at a normal one for comparison.
August 13, 200718 yr Its more of a judgement call on that. But I'd say if it rotates more than 5 degrees something isn't cosher.
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