Underdrive pulleys
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Senior User
Joined: Jun 2003
Posts: 225
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From: Memphis
Underdrive pulleys
I did a search and saw a lot of people recommending UP but i didnt see any brands mentioned.
What brand are you running and are you happy with them? How much did they cost? Are you running an alternator underdrive too and if so, do you have a higher output alt?
Thanks everyone.
What brand are you running and are you happy with them? How much did they cost? Are you running an alternator underdrive too and if so, do you have a higher output alt?
Thanks everyone.
Posting Guru
Joined: Mar 2007
Posts: 1,757
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From: Florida
I've got one pulley on my truck...bought it used it's only the crank pulley and I beleive it's BBK...if you surf E-bay I saw some the other day that wer like 50 bucks for the crank.waterpump, and alt pulleys flat black so they look stock.They do do a great deal of good on the motors.....I used my stock alt...what is that like 75 amps?lol......I think the battery in my truck is going dead though so I'd grab the full set.
Postmaster
Joined: Jul 2006
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From: Central PA
By turning accessories at a slower rate the strain on motor is less. They are fine for on road guys. I had set crank alt and fan on old truck and had no charging,cooling related problems even sitting in traffic down town Pittsburg in june with air on for 2 hrs. .
But at low rpms like off road they be a problem. There is a slight MPG increase . But as for a profomace add not much on mine. But any thing to add to MPG . Mine is a polished set from ebay . I got second hand and no marking could be found. Good luck
But at low rpms like off road they be a problem. There is a slight MPG increase . But as for a profomace add not much on mine. But any thing to add to MPG . Mine is a polished set from ebay . I got second hand and no marking could be found. Good luck
Elder User
Joined: May 2007
Posts: 544
Likes: 1
They now sell underdrive kits that allow you to still get power and the same alternator output.
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MCH%2D1015&N=700+ 4294908331+4294908312+4294924761+4294840126+429481 7292+4294862783+115&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MCH%2D1015&N=700+ 4294908331+4294908312+4294924761+4294840126+429481 7292+4294862783+115&autoview=sku
Posting Guru
Joined: Mar 2007
Posts: 1,757
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From: Florida
Moore, that is the kit.....to compensate for the crank pulley being smaller...they make the alt pulley larger so you still get the same charging capabilities.
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Elder User
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Originally Posted by lostin90s
By turning accessories at a slower rate the strain on motor is less. They are fine for on road guys. I had set crank alt and fan on old truck and had no charging,cooling related problems even sitting in traffic down town Pittsburg in june with air on for 2 hrs. .
But at low rpms like off road they be a problem. There is a slight MPG increase . But as for a profomace add not much on mine. But any thing to add to MPG . Mine is a polished set from ebay . I got second hand and no marking could be found. Good luck
But at low rpms like off road they be a problem. There is a slight MPG increase . But as for a profomace add not much on mine. But any thing to add to MPG . Mine is a polished set from ebay . I got second hand and no marking could be found. Good luck
