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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-05-2011, 12:14 PM   #1
Michel
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Rear 'Thump' when changing gears - wavetrac LSD

Hey everyone,

Before getting my lsd installed, i would hear the typical light thump when going into 1st gear or sometimes other gears. After I got my wavetrac lsd installed (which is amazing might I add!) I intermittently hear a loud thump when going into 1st gear from a dead stop, or when shifting into other gears. Basically the noise became louder and more frequent after the diff install.

The diff is properly shimmed and doesn't make any whinning noises or anything. My diff bushings seem ok as there is no shifting of the differential when I hear the noise (put it up on jack stands and checked) and my half shafts aren't binding from what I can see (not sure if theres any way to test them) Could it be clutch related? I'm running an m5 clutch w/uuc flywheel combo.

Thanks in advance,
Michel
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Old 07-05-2011, 01:55 PM   #2
paraklas
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Not that relevant with your issue (if it's an issue anyway) but from where did you get the LSD ?
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Old 07-05-2011, 03:12 PM   #3
Michel
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Got it from a local place called JRP - an authorized wavetrac dealer. I think their website is something like www.jrponline.com iirc.
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Old 07-06-2011, 10:28 AM   #4
mrshelley
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Try this:
Put the car up on jackstands
Start the car (let it idle)
Put it in 1st gear (brake not applied)
Does it clunk?
Is the car much easier to put in 1st gear?
Are the rear wheels turning?

After this, look at the driveshaft. The rear CV joint might be worn, the center U joint might be worn, the flex disk might be worn. Since you had the clunk before hand, the problem probably lies in the driveshaft department.

Also, make sure everything is tight and that the LR subframe pickup point is not ripping itself out of the body.
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Old 07-06-2011, 10:43 AM   #5
Steven747
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leaky axle boot
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Old 07-06-2011, 10:46 AM   #6
Michel
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^thanks those are good suggestions, I'll try that! My subframe is heavily reinforced lol so I know its not torn.
If the problem does lie in any driveshaft component, why did the noise get significantly louder after the diff install? could the fact that the lock in the diff. cause more strain on those components resulting in the louder thump? (kinda just making that up hahaha)

edit: Steven747, there are no leaks visible anywhere.
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Old 07-12-2011, 03:02 PM   #7
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Just got word from my mechanic, turns out the center u-joint is ceased, diff bushings are cracked and there is only slight play in the axles (axles are probably not the main cause of the problem as he said, but I'm replacing them anyways)... getting everything done this week. thanks for the suggestions!

Last edited by Michel; 07-12-2011 at 03:03 PM.
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Old 07-14-2011, 11:32 AM   #8
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Diff bushings would be my first guess, when they did install of LSD why did they not mention bushings?
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Old 07-14-2011, 12:06 PM   #9
Michel
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^ the bushings looked fine at the time, I've taking the diff out more than a couple of times now so I'm thinking with each time the bushings deteriorate further - plus my driving became more aggressive after the lsd install
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Old 07-14-2011, 12:25 PM   #10
TxZHP04
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I recently ran into a similar situation, except I've had my LSD for years and just recently started noticing the thump. Mostly I would notice it when shifting into 1st while sitting at a stop but sometimes I would notice it on a 1-2 shift, especially if I happened to shift while turning (say in the middle of a wide intersection). Initially thought it was just the diff bushing as an inspection revealed that it was due to be replaced again (was visibly torn). Replaced the bushing but the noise didn't go away. A month or so later I started to notice some grease leaking from the inner CV boot - the boot itself was not torn so I can only guess that the grease was squirting out underneath the clamp. Since the inner joint was losing grease, I started looking for any unusual signs of play or damage that might keep me from simply replacing the boot. Sure enough, with the full weight of the car sitting on the ground, I could reach under the car and slide the half shaft back and forth axially enough to cause it to make noise. I replaced the half shaft last weekend and the thumping noise is now gone.

I would definitely check for signs of grease leaking from the CV boots but I wouldn't stop there. You should also check for any abnormal play in the joints. If you have some play in the axle, perhaps the WaveTrac's spring loaded static lock mechanism is transferring load to that axle that the stock open diff wasn't thereby taking up the slack in the axle and causing the thump.
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Old 07-14-2011, 01:10 PM   #11
Michel
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^ welll said regarding the load transfer to the axles - makes perfect sense! My mechanic said there was some play in the axles so I just got new ones. I'll likely be picking up the car tomorrow and will report if the noise is gone. Thanks all for the suggestions!
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Old 07-15-2011, 10:19 AM   #12
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Quote:
Originally Posted by TxZHP04 View Post
I recently ran into a similar situation, except I've had my LSD for years and just recently started noticing the thump. Mostly I would notice it when shifting into 1st while sitting at a stop but sometimes I would notice it on a 1-2 shift, especially if I happened to shift while turning (say in the middle of a wide intersection). Initially thought it was just the diff bushing as an inspection revealed that it was due to be replaced again (was visibly torn). Replaced the bushing but the noise didn't go away. A month or so later I started to notice some grease leaking from the inner CV boot - the boot itself was not torn so I can only guess that the grease was squirting out underneath the clamp. Since the inner joint was losing grease, I started looking for any unusual signs of play or damage that might keep me from simply replacing the boot. Sure enough, with the full weight of the car sitting on the ground, I could reach under the car and slide the half shaft back and forth axially enough to cause it to make noise. I replaced the half shaft last weekend and the thumping noise is now gone.

I would definitely check for signs of grease leaking from the CV boots but I wouldn't stop there. You should also check for any abnormal play in the joints. If you have some play in the axle, perhaps the WaveTrac's spring loaded static lock mechanism is transferring load to that axle that the stock open diff wasn't thereby taking up the slack in the axle and causing the thump.
is there any reason to beef up axles with a ts+?
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Old 07-15-2011, 01:17 PM   #13
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Quote:
Originally Posted by steven747 View Post
is there any reason to beef up axles with a ts+?
That would really depend on driving style. If you're doing a lot of drop clutch launches, perhaps. At that point though you have to decide where you want your point of failure to be.

I replaced a half shaft at 120k miles, 50k of which have been SC'd. It hadn't "failed" but there was excess play at the outer CV (ironic since it was leaking grease from the inner joint). Unless you're frequently shock loading the drive train, I'd say the stock axles are fine even with the TS3.
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Last edited by TxZHP04; 07-15-2011 at 01:18 PM.
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Old 07-15-2011, 02:18 PM   #14
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^ what kind of axles did you replace them with? OEM or something aftermarket?
I went with FEQ, but sort of regretting this now after reading some reviews :s
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Old 07-15-2011, 02:47 PM   #15
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I ordered OE BMW through ebmwparts.com. With the exception of the parts I deliberately buy aftermarket for performance reasons, I tend to stick with genuine BMW parts.
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