# 9 second zr1

**URL:** <https://forums.speedlife.net/t/9-second-zr1/248885>\
**Category:** Shift518 Automotive\
**Created:** [December 7, 2009, 3:21pm UTC](https://forums.speedlife.net/t/9-second-zr1/248885 "2009-12-07T15:21:53Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![94Gt5.0](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/94gt5.0/32/6377_2.png) [@94Gt5.0](https://forums.speedlife.net/u/94Gt5.0)\
**Post date:** [December 7, 2009, 4:42pm UTC](https://forums.speedlife.net/t/9-second-zr1/248885/5 "2009-12-07T16:42:37Z")

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> [@Shots Fired At Kids Choice Awards After-Party](https://forums.speedlife.net/t/shots-fired-at-kids-choice-awards-after-party/26948/6):
>
> What is the upper/lower pulley? On my car theres only 1 pulley you change to make the blower spin faster, and that’s the one at the end of the supercharger snout.
> 
> Just curious, i’m not very informed when it comes to modding ZR1’s :lol

The lower pulley is the crank pulley

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