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UNDERDRIVE PULLEYS 

 

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 Post subject: UNDERDRIVE PULLEYS
Posted: Thu May 04, 2006 12:39 am 
Getting Side Ways
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Ride: 07 BF mk2 E-gas wagon + eb 5.0

Power: 174 rwkw

Location: Adelaide
SA, Australia

basically i just want to know what they are and what they do. i see this listed a lot in ppls mods. i'm a bit knew to the v8 thing so just bear with me if i seem to be asking some basic questions over next few weeks

 

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eb v8: low loud and fast. just how a v8 should be. i guess the big question is, is it fast enough...

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Posted: Thu May 04, 2006 8:20 am 
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Ride: BA Ford Fairlane V8

Location: Lower Hunter Valley
NSW, Australia

The underdrive pullies are a way of getting much better engine acceleration and throttle response plus a bit more grunt by substituting your main pulley that is attached to your harmonic balancer that drives your serpentine belt. for a smaller pulley. The engine doesn't work as hard with the smaller pulley as it once did with the larger stock one.

An easy way to think about it is. Your mountain bike has 18 gears with 6 at the back and 3 sprockets at the front. The gears at the back are the air con, power steering, water pump, alternator etc and when you use the biggest front sprocket, its harder to push these items than the smallest front sprocket.

Thats the easiest way of explaining it. Well worth the cash too if you fit them.

 

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Posted: Thu May 04, 2006 3:34 pm 
Getting Side Ways
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Ride: 07 BF mk2 E-gas wagon + eb 5.0

Power: 174 rwkw

Location: Adelaide
SA, Australia

thanks mate.

 

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eb v8: low loud and fast. just how a v8 should be. i guess the big question is, is it fast enough...

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Posted: Thu May 04, 2006 4:14 pm 
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hi there all
is there any problems with alternator charging or pwr steer geting heavier due to the smaller pully? what kit do people recomend street or race kit?

 

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Posted: Thu May 04, 2006 5:38 pm 
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i have the ford racing 3 pulley version, the main pulley, water pump and alternator, haven't noticed any issues with the power steering but lately the car has only been making short trips down to the shops, 50/60km zone, with my missus driving she doesn't get the revs up to charge the battery and the volt meter doesn'y get past the first line about 11v, she's has had to get a jump start twice, it's fine when I take it to work though, cos the revs get up into the charge zone for the alternator not quite 14v on the gauge, so just something to think about if you don't get much highway driving, I now have to put it on the charger if I don't use it, Otherwise they are worth it.

 

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Posted: Thu May 04, 2006 7:59 pm 
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so would it be worth getting just the street kit - just the crank pulley?
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Posted: Thu May 04, 2006 9:45 pm 
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gunit18 wrote:
so would it be worth getting just the street kit - just the crank pulley?


If you gonna do it get the lot, I reckon the belt tension would be questionable with just a crank pulley as it is smaller, it may be fine I don't know, but by putting the larger alternator and water pump pulleys on it negates that, up to you I suppose, I just couldn't see the point of doing half the job.

 

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Posted: Fri May 05, 2006 12:19 am 
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WA, Australia

im just runnin crank pulley.. its fine..

no noticable charge/power steering issues.

 

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Posted: Thu May 08, 2008 7:51 pm 
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Ride: XR6

Location: Sydney
NSW, Australia

Just wondering if anyone has had these crack or what not and are they good wearing, what are they made out of too Thanx
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