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      09-09-2021, 08:09 PM   #10
slcook54
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Drives: 2012 MR M3 / 2018 SMB M3 CS
Join Date: Aug 2014
Location: San Francisco

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Quote:
Originally Posted by zcp312 View Post
Quote:
Originally Posted by sokkiee View Post
how did the car feel after installing the MS underdrive pulleys
My butt dyno didn't feel anything, maybe a tiny bit more instant responsiveness on the throttle but could have been mental. This is with a direct comparison actually, I was already on his older stage 2 tune with all the other mods, then installed the MS pulley without flashing the new tune and drove it for a few weeks prior to this dyno run with a new tune.

But the car 100% runs hotter after the MS pulley on both old and new tunes. It gets past the 210° point quicker when I push the car or track it and gets to a higher temperature overall as well. I also remember Alex did advise against the pulley when I initially asked him his thoughts. Searching the forum also sees people give mixed reviews on installing pulleys and my shop did say they haven't seen problems with them so I decided to try it out.
Pulley underdrives the water pump, I've never understood this for like 10hp.
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