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Whirring noise when downshifting...

Old Jul 2, 2006 | 08:04 PM
  #1  
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Whirring noise when downshifting...

When downshifting with the clutch pressed, I notice and feel a whirring noise coming from somewhere (but it sounds like from the shifter or tranny). It sounds like when you let off the trigger on a power trill and hear its gears and the motor come slow down to a stop. Is this normal? I hear it mostly when downshifting from 3rd to 2nd or from 2nd to 1st.
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Old Jul 2, 2006 | 08:06 PM
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From: socal
assuming you mean the synchros, yes its normal.
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Old Jul 2, 2006 | 08:07 PM
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From: CA, Rowland Hts.
normal
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Old Jul 2, 2006 | 10:22 PM
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Normal, and one of my favorite sounds.....

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Old Jul 2, 2006 | 10:29 PM
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yup, those are the snychros doing their job, I'm surprised you can hear it, many times you can't on manual cars.
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Old Jul 2, 2006 | 11:10 PM
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Originally Posted by bbtheory
Normal, and one of my favorite sounds.....

Oh my god yes...
That's my girlfriend's favorite part...well, that and the daily redline :D
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Old Jul 3, 2006 | 09:57 AM
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Hear that all the time too. Also I do love the sound.
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Old Jul 3, 2006 | 11:38 AM
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She whistles while she works.
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Old Jul 3, 2006 | 01:09 PM
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I'm still not sure how to engine brake =/
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Old Jul 3, 2006 | 01:12 PM
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From: portland oregon
synchros-
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Old Jul 3, 2006 | 01:13 PM
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From: socal
Originally Posted by Raptor2k
I'm still not sure how to engine brake =/
shift to a lower gear :|
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Old Jul 3, 2006 | 01:18 PM
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Do I rev match too?
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Old Jul 3, 2006 | 02:36 PM
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From: socal
of course.
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Old Jul 5, 2006 | 02:42 AM
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Wait you don't rev match to engine brake do you? I always thought you just shift to the lower gear and slowly let off the clutch.
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Old Jul 5, 2006 | 02:45 AM
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no rev matching while engine braking, I think (or at least, not much)...
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Old Jul 5, 2006 | 02:53 AM
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engine braking you do not rev match otherwise you just stay at the same speed u are at you slowly let go of the clutch and the car will slow down as the rpms rise
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Old Jul 5, 2006 | 03:34 AM
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That's what I've thought....rev matching wouldn't slow the car down, obviously, but slowly letting off the clutch and letting the RPMs find themselves did slow it down. But wouldn't it be bad for the synchros? (just a question, don't necessarily want to start another debate)
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Old Jul 5, 2006 | 03:44 AM
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From: socal
i may be wrong, but that's how i've been taught.
i don't see anything wrong with rev matching... why wouldn't you slow down after a rev match? if you're doing 65 in 6th, rev match to 4th and keep off the gas, of course you would slow down.
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Old Jul 5, 2006 | 03:52 AM
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From: socal
Originally Posted by limepro
engine braking you do not rev match otherwise you just stay at the same speed u are at you slowly let go of the clutch and the car will slow down as the rpms rise
so you're saying slip the clutch? ehhh, no thanks. i'll pass on that.
i don't understand why you think you would stay at the same speed.

Last edited by cjkim; Jul 5, 2006 at 03:54 AM.
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Old Jul 5, 2006 | 03:54 AM
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Originally Posted by cjkim
i may be wrong, but that's how i've been taught.
i don't see anything wrong with rev matching... why wouldn't you slow down after a rev match? if you're doing 65 in 6th, rev match to 4th and keep off the gas, of course you would slow down.
Then why not just let off the gas while you're in 6th?
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Old Jul 5, 2006 | 04:22 AM
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From: socal
you could... but that would only create minimal engine braking.
it's not all that useful unless you're traveling downhill a lot anyways.
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