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      01-15-2013, 07:36 PM   #1
uplusd
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Macht Schnell Underdrive Pulley Potential Issue

I installed Macht Schnell Underdrive Pulleys last week. Now when I turn the steering wheel full lock (car doesn't need to be moving), I get a constant squealing sound.

I understand the pulleys will underdrive the power steering and at low to no speed thats where power steering needs the most power. But I'm wondering if this is normal and other people experience it as well?
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      01-15-2013, 07:55 PM   #2
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There should not be any squealing. Maybe you got oil on a belt or pulley somehow or maybe you installed the pulley(s) or belt incorrectly.
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      01-15-2013, 08:05 PM   #3
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Squealing means the belt is loose. You need to tighten it
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      01-15-2013, 08:18 PM   #4
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If you have done this job, you know that you cannot tighten the belt. There is a self-adjusting tensioner.
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      01-15-2013, 08:18 PM   #5
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Quote:
Originally Posted by pbonsalb View Post
If you have done this job, you know that you cannot tighten the belt. There is a self-adjusting tensioner.
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      01-15-2013, 08:21 PM   #6
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Make sure the bolts are tight.

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      01-15-2013, 08:24 PM   #7
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Have the exact same issue with my Dinan pulley. Others have told me that I should not hold the steering wheel against full lock (bad for steering pump and will make noise no matter what), but don't recall this happening pre-pulley, so I'm not sure what the right answer is.
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      01-15-2013, 08:25 PM   #8
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Quote:
Originally Posted by pbonsalb View Post
If you have done this job, you know that you cannot tighten the belt. There is a self-adjusting tensioner.
No havent..know better than to fool with this for some nothing gains..but thats a topic for a different discussion..

Bottom line something is loose..be it the belts or the bolts..fyi spilling oil on your belts wont cause them to squeal either.
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      01-15-2013, 08:34 PM   #9
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Quote:
Originally Posted by mhabs View Post
Have the exact same issue with my Dinan pulley. Others have told me that I should not hold the steering wheel against full lock (bad for steering pump and will make noise no matter what), but don't recall this happening pre-pulley, so I'm not sure what the right answer is.
I've heard this as well. Though it wasn't clear to me whether it was bad for the pump or the rack (or both).

Either way, mine didn't squeal before and doesn't now (AA pulley). Something is not right.
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      01-15-2013, 10:08 PM   #10
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Quote:
Originally Posted by uplusd View Post
I installed Macht Schnell Underdrive Pulleys last week. Now when I turn the steering wheel full lock (car doesn't need to be moving), I get a constant squealing sound.

I understand the pulleys will underdrive the power steering and at low to no speed thats where power steering needs the most power. But I'm wondering if this is normal and other people experience it as well?
How hard are you turning the wheel against the lock?

I just installed the MS pullies but haven't ever turned my wheel hard to the lock so I don't know if I have this problem. I can try and report back. T he power steering pulley is no longer ribbed so it may be slipping and squeaking?
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      01-15-2013, 11:01 PM   #11
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sadly, this is exactly why I didn't get a UDP this time on my second M3... I had it on my first m3 and really don't feel that all these potential issues / risks are worth it for a few extra ponies..
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      01-16-2013, 12:14 AM   #12
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Quote:
Originally Posted by mhabs View Post
Have the exact same issue with my Dinan pulley. Others have told me that I should not hold the steering wheel against full lock (bad for steering pump and will make noise no matter what), but don't recall this happening pre-pulley, so I'm not sure what the right answer is.
Correct, you should never be holding full lock on your power steering, as this can cause damage to the rack.
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      01-16-2013, 12:18 AM   #13
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Quote:
Originally Posted by tom @ eas View Post
Correct, you should never be holding full lock on your power steering, as this can cause damage to the rack.
I first noticed the noise when I had to go full lock to get out of a tight parking spot.
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      01-16-2013, 12:23 AM   #14
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I've had the MS pullies on my car for over 2 years and around 35K miles. No problems, no weird noises, no issues at all. I occasionally will hit full lock, but will always give it less wheel to bring it off lock.

You may have had an installation error or now the pullies are highlighting a pre-existing problem
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      01-16-2013, 12:32 AM   #15
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Quote:
Originally Posted by Rapture View Post
I've had the MS pullies on my car for over 2 years and around 35K miles. No problems, no weird noises, no issues at all. I occasionally will hit full lock, but will always give it less wheel to bring it off lock.

You may have had an installation error or now the pullies are highlighting a pre-existing problem
M3s typically don't have power steering issues, but you've got the right idea.

Belts do grip best when warm, its not uncommon to hear a chirp from a cold engine. Make sure there is no grease/oil on the pulley surface or belts, the tensioner should provide the tension it needs.
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      01-16-2013, 12:32 AM   #16
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Thx Tom, would you advise to have someone take a look at it, or is the noise to be expected at full lock? I have a super tight driveway/garage that's tough to get out of and therefore that causes me to go full lock sometimes (will have to be more careful).

Quote:
Originally Posted by tom @ eas View Post
Correct, you should never be holding full lock on your power steering, as this can cause damage to the rack.
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      01-16-2013, 12:34 AM   #17
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Quote:
Originally Posted by mhabs View Post
Thx Tom, would you advise to have someone take a look at it, or is the noise to be expected at full lock? I have a super tight driveway/garage that's tough to get out of and therefore that causes me to go full lock sometimes (will have to be more careful).
Nothing wrong with a second opinion, but everything should be perfectly fine.
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      01-16-2013, 12:39 AM   #18
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Thx..probably will have dealer take a look at it next time I get the oil changed.

Quote:
Originally Posted by tom @ eas View Post
Nothing wrong with a second opinion, but everything should be perfectly fine.
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      01-16-2013, 04:55 PM   #19
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I have the sound after installing the MS pulley as well, at full lock. I wonder if the single pulley design of the AA pulley exhibits this issue. It stands to reason that the smooth pulley/belt from MS isn't grabbing as well as a ribbed pulley/belt would.
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      01-16-2013, 07:01 PM   #20
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Quote:
Originally Posted by urBan_dK View Post
I have the sound after installing the MS pulley as well, at full lock. I wonder if the single pulley design of the AA pulley exhibits this issue. It stands to reason that the smooth pulley/belt from MS isn't grabbing as well as a ribbed pulley/belt would.
My AA pulley has never made a sound. I have the older '08 pulley though. I dunno the differences so I'm not sure if that affects it or not.
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      01-16-2013, 07:03 PM   #21
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Mine is older 08 as well.
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      01-16-2013, 07:09 PM   #22
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I installed an AA pulley about 2-4 weeks ago and do not experience any of the symptoms you mentioned. I double checked
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