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> do underdrive pulleys really help?
post Aug 5, 2006 - 12:35 PM
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nate95

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Just curious if any body had put an underdrive pulley on there car, and how much of a difference it made, or how much HP you gained,, thanks.
 
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post Aug 11, 2006 - 1:13 AM
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Bitter

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pulleys need to be balanced as well, not to mention that most crank pulleys have a rubber dampener that helps to absorb vibrations so you dont get erroneous misfire codes.

its about DSM's but can be applied to most any other motor http://www.machv.com/tip11cranpul.html

This post has been edited by Bitter: Aug 11, 2006 - 1:16 AM


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post Aug 11, 2006 - 3:19 AM
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Kwanza26



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QUOTE(Bitter @ Aug 11, 2006 - 6:13 AM) [snapback]467737[/snapback]

pulleys need to be balanced as well, not to mention that most crank pulleys have a rubber dampener that helps to absorb vibrations so you dont get erroneous misfire codes.

its about DSM's but can be applied to most any other motor http://www.machv.com/tip11cranpul.html

All gospel... at least when it comes to toyota engines. Those "rubber damners" do absorb vibrations... but it's nothing more than glue for the most part. If it were such a big deal, little things like over tightened drive belts, slightly overtorqued/undertorqued pressure plate bolts, grease build up... would all upset the crank balance. I've run underdrive pulleys on damn near every performance engine we've built at my shop... and never had a problem for 8 some odd years. Myth. There's a lot more needed to upset the crank balance than a crank pulley weighing a few pounds less. Hell... driving the car hard upsets the crank balance more than an underdrive pulley...


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Posts in this topic
- nate95   do underdrive pulleys really help?   Aug 5, 2006 - 12:35 PM
- - celicaST   QUOTE(nate95 @ Aug 5, 2006 - 11:35 A...   Aug 5, 2006 - 3:50 PM
|- - Fastbird   QUOTE(celicaST @ Aug 5, 2006 - 4:50 ...   Aug 11, 2006 - 7:26 PM
- - Bitter   most aftermarket underdrive crank pulleys... 1. do...   Aug 7, 2006 - 12:13 AM
|- - Kwanza26   QUOTE(Bitter @ Aug 7, 2006 - 5:13 AM...   Aug 7, 2006 - 12:38 AM
|- - Bitter   QUOTE(Kwanza26 @ Aug 7, 2006 - 12:38...   Aug 7, 2006 - 2:30 PM
- - pure_dx   in some cars, it works better, and in some it wont...   Aug 7, 2006 - 11:19 AM
|- - m0dd3d1   QUOTE(pure_dx @ Aug 7, 2006 - 11:19 ...   Aug 7, 2006 - 11:27 AM
- - Kwanza26   The difference also depends on the engine. On the...   Aug 7, 2006 - 1:49 PM
- - K-ESD   Thanks Kwanza26 for your knowlege and solid answer...   Aug 10, 2006 - 7:36 PM
- - Bigmeanbulldog55   Kwanza always bashes on the 5sfe motor, especially...   Aug 10, 2006 - 8:28 PM
|- - puretone   underdrive pulleys, not balanced, is all i gotta s...   Aug 10, 2006 - 10:55 PM
|- - Bigmeanbulldog55   QUOTE(puretone @ Aug 10, 2006 - 11:5...   Aug 11, 2006 - 12:54 AM
- - Bitter   pulleys need to be balanced as well, not to mentio...   Aug 11, 2006 - 1:13 AM
|- - Kwanza26   QUOTE(Bitter @ Aug 11, 2006 - 6:13 A...   Aug 11, 2006 - 3:19 AM
|- - puretone   QUOTE(Bitter @ Aug 11, 2006 - 1:13 A...   Aug 11, 2006 - 6:07 PM
- - ExSane   I've also learned some new stuff. Thanks Kwanz...   Aug 11, 2006 - 4:01 AM
- - pandakid   where can you get pulleys?   Aug 13, 2006 - 4:23 AM
|- - DeW_H0e_GT   QUOTE(pandakid @ Aug 13, 2006 - 4:23...   Aug 14, 2006 - 12:33 AM
- - AllTrac96   kwanza i don't see you come around very often ...   Aug 13, 2006 - 11:51 AM


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