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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 07-08-2008, 10:26 PM   #1
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Under Drive Pulleys

Hi I'm new to this forum and I wanted to ask a question. I don't know if its been asked before but I wanted to know if an under drive pulley kit for an M3 is worth it. I also wanted to know if I change the alternator pulley will it make my lights dim or if it wont charge enough. Would appreciate any repies or suggestions.
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Old 07-09-2008, 10:44 AM   #2
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I'm using the TMS under drive pulleys and here are my thoughts: it will make a small impact to overall performance - so obvsiouly don't expect big gains. And it won't make your 'lights dim' while you drive...the caution I have heard is if you have a lot of aftermarket electronics it might not be a good idea...I have added some electronics to my car and don't have any problems.

Is this a track car?


1999 328i Sedan
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Old 07-10-2008, 07:32 PM   #3
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nah its just a street car but i was also thinkin about adding a supercharger in future would i have to go back to my old pulleys.
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Old 07-11-2008, 10:08 AM   #4
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Search and you will find a crap load of info on them.
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Old 07-11-2008, 10:39 PM   #5
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its your best friend. if you do plan to supercharge in the future they tend to use different pulley setups so you might want to consider getting under drivepulleys if your going to supercharge soon. but then again if your honestly looking to go fast then track lessons would do more good then either mod
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Old 07-13-2008, 08:11 AM   #6
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You might want to still run the stock water pump pulley. A smaller pump pulley just allows the pump to spin faster and allow for more flow around the block and cylinder head. Increased flow (especially around the cylinder head) just pulls more heat away from it thus less chance for the knock sensors to back the timing down (less power).
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