GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Underdrive Pulleys

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Old 6/22/05, 09:03 PM
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What is the downside to underdrive pulleys? Will the battery go dead easier? Will the airconditioner not work as well, will the water pump not cool the engine fast enough?

Thanks for the info
Old 6/23/05, 12:38 PM
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Anybody with this mod have any problems?
Old 6/23/05, 12:50 PM
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No problems
Old 6/23/05, 12:50 PM
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I've had the UD pulleys on for about 6-7 months and had no problems at all. I doubt anyone will have any problems either. Maybe years back it would have been more risky.
Old 6/23/05, 01:58 PM
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the down side is 189 dollers for them!
Old 6/23/05, 02:21 PM
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Originally posted by porsche@June 23, 2005, 1:01 PM
the down side is 189 dollers for them!
try 249...
Old 6/23/05, 02:26 PM
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Originally posted by stkdidy@June 23, 2005, 2:24 PM
try 249...
wow went up! :notnice:
Old 6/23/05, 02:59 PM
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Originally posted by porsche@June 23, 2005, 3:29 PM
wow went up! :notnice:
You can get them for 169 on Sean Hylands site
Old 6/23/05, 09:14 PM
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This is good info. I have been thinking about headers and pulleys.

Old 6/23/05, 09:22 PM
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Working fine here.......no noticeable temp rise.....Of course we have 9 months of winter , 1 Fall , 1 spring and one HOT
Old 6/23/05, 09:37 PM
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no problems here!!!!!
Old 6/24/05, 07:21 AM
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Check out SeanHylandMotorsports and read what they say about their pulleys. Some companies are selling a 3 pulley underdrive kit which can damage the alternator. Also, the weight needs to be close to the factory pulley weight. I see a lot of kits that are lighter, a lot lighter, which also can cause a problem.
Old 6/24/05, 02:25 PM
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Originally posted by softbatch@June 23, 2005, 2:02 PM
You can get them for 169 on Sean Hylands site
ya i ordered those...then after 2 and a half months of no pullies and no contact with me they refunded my $$$ and i bought steedas from someone here with it
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