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07-28-2001, 05:23 PM | #1 |
Scooby Newbie
Member#: 7702
Join Date: Jun 2001
Location: NY 326 whp
Vehicle:2002 WRXsilverWagon v7 sti-ra drivetrain |
does anyone else feel/hear a knock while shifting into 2nd
sometimes when i shift into second at high rpm's, i hear and feel a knock in the rear, is that normal? does anyone know what that is
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07-28-2001, 08:19 PM | #2 |
Scooby Newbie
Member#: 3791
Join Date: Jan 2001
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im pretty sure thats the rear diff locking under power. I think it's ok.
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07-28-2001, 11:36 PM | #3 |
Scooby Newbie
Member#: 8276
Join Date: Jul 2001
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I had posted the "WRX shifting technique" thread in WRX non-technical forum, see 2nd page, aod's response. aod said to use the clutch for a longer duration to avoid that slamming noise, when you are going high revs from 1st to 2nd.
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07-29-2001, 02:54 PM | #4 |
Scooby Newbie
Member#: 8791
Join Date: Jul 2001
Location: APS-Cobb RT-Spec. 1/4 mile: 12.76@106 mph
Vehicle:2002 Impreza WRX Midnight Black |
This is mainly caused by a heavy flywheel. If you upgrade to a lightweight flywheel, you will not have the driveline "thump" you are feeling now...
James '02 Midnight Black Subaru Impreza WRX |
07-29-2001, 03:10 PM | #5 |
Scooby Specialist
Member#: 3357
Join Date: Dec 2000
Chapter/Region:
MAIC
Location: Gburg, Maryland (East Coast)
Vehicle:2002 WRX Black |
It's the Center diff locking.. You have to drive the car smoother to avoid this.... Lightened flywheel will not save you on this one... Being a better driver would.
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07-29-2001, 03:44 PM | #6 |
Scooby Newbie
Member#: 8791
Join Date: Jul 2001
Location: APS-Cobb RT-Spec. 1/4 mile: 12.76@106 mph
Vehicle:2002 Impreza WRX Midnight Black |
All I know is, my 2.5RS with Minnam stage 2 used to do this until I got the lighter flywheel.... No more thumping noises...
James '02 Midnight Black Subaru Impreza WRX |
07-29-2001, 03:47 PM | #7 |
Scooby Specialist
Member#: 3357
Join Date: Dec 2000
Chapter/Region:
MAIC
Location: Gburg, Maryland (East Coast)
Vehicle:2002 WRX Black |
i guess we are answering two things... but for the main part.. My RS did it too...
Go figure... |
07-29-2001, 03:54 PM | #8 |
Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
Rear diff locking? Center diff locking? Uhhhhh guys... we have VISCOUS diff's - there are no mechanical parts in them to lock - AT ALL.
That noise you hear is purely driveline slop being taken up from the driveshaft, rear axles, trans... something, or maybe everything. I drove my RS with it for a while, then it started going away after I put a lot of miles on it and was beating on it profusely. ***Not recommended procedeure for new drivers - learn to slip the clutch better*** |
07-29-2001, 03:57 PM | #9 |
Scooby Specialist
Member#: 3357
Join Date: Dec 2000
Chapter/Region:
MAIC
Location: Gburg, Maryland (East Coast)
Vehicle:2002 WRX Black |
8, with 15k of beating on my RS. it's didn't go away.. if it did anything they became more apparent.
Curious to what made yours go away.. besides the habit of smooth driving.. |
07-29-2001, 04:04 PM | #10 |
Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
Heh, I drive far from smooth.
I don't know... I think I may have just beaten them right and they bedded in instead of floated about. I honestly couldn't say. *shrug* |
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