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Are Underdrive pulley setups worth having? 

 

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 Post subject: Are Underdrive pulley setups worth having?
Posted: Wed Jan 10, 2007 1:18 am 
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The subject pretty much speaks for itself. I've read in a few other threads and forums that people put them in then go and take them out again. Why is this? I was thinking about getting them fitted when I supercharge the motor but am wondering if it's such a good idea if everyone ends up pulling them out again.

 

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Posted: Wed Jan 10, 2007 1:26 am 
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what exactly does it mean to have underdrive pulleys?

 

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Posted: Wed Jan 10, 2007 1:41 pm 
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i have only heard good things about the set b.p.t. do for 5ltrs.

 

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Posted: Wed Jan 10, 2007 1:43 pm 
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kapul wrote:
what exactly does it mean to have underdrive pulleys?



they reduce the power loss of runing things like power steer, aircon and altanator.

 

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Posted: Wed Jan 10, 2007 1:45 pm 
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kapul wrote:
what exactly does it mean to have underdrive pulleys?


i second that.....

u said it reduces power taken from air con etc....how???

how is it typically set up??

 

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Posted: Wed Jan 10, 2007 1:49 pm 
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the pullies are sized different to standard, smaller i think. makes it easier to turn the pullies so less strain on the donk to run accesories. i think thats the way it works.

 

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Posted: Wed Jan 10, 2007 1:50 pm 
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oh ok...so its just different size pulleys.....not a new belt system?

 

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Posted: Wed Jan 10, 2007 1:53 pm 
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SpuDTE wrote:
kapul wrote:
what exactly does it mean to have underdrive pulleys?


i second that.....

u said it reduces power taken from air con etc....how???

how is it typically set up??


By changing the size of the pulleys on the crankshaft and accessories (alternator, water pump etc), you change the gearing acheived through the accessory belt.

By changing the gearing, you alter the relationship of the power/speed/torque which is required to drive each accessory - and therefore change the amount of the engine's power which is absorbed by driving the accessories.

 

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Posted: Wed Jan 10, 2007 1:54 pm 
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SpuDTE wrote:
oh ok...so its just different size pulleys.....not a new belt system?


yep. prety sure you use the standard belt.

 

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Posted: Wed Jan 10, 2007 1:56 pm 
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millard455 wrote:
SpuDTE wrote:
oh ok...so its just different size pulleys.....not a new belt system?


yep. prety sure you use the standard belt.


Yeah i think for the actual change in the pulley sizes (prob only a few % difference), the tensioner would be able to cope with the difference.

 

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Posted: Wed Jan 10, 2007 7:04 pm 
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There are two sets available from BPT. Street series consists of just the one crankshaft pulley and requires a smaller belt and race series consists of 3 pulleys crankshaft, alternator and water pump and this kit uses your original standard size belt.
Hope this helps, Jeff

 

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Posted: Wed Jan 10, 2007 11:51 pm 
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I'm going to get the supercharger done at BPT so I guess it's good to know they have the kits. However, is there someone out there whose had them in then pulled them out and can tell me why they've done so???

 

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Posted: Wed Jan 10, 2007 11:54 pm 
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XH4LWEPN - which set are you using and is there a noticable difference?

 

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Posted: Thu Jan 11, 2007 8:47 am 
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I had heard that they actually change the turn ratio so that the accessories turn slower and in some cases too slow. Any truth to that?

 

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Posted: Thu Jan 11, 2007 8:57 am 
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MikGan wrote:
I had heard that they actually change the turn ratio so that the accessories turn slower and in some cases too slow. Any truth to that?


I'm using a 3 pulley setup on my car and theres been no probs at all,car still runs cool and alternator seems to work fine,still uses the same size belt.suppose to gain around 10-15 kw's. :?:

 

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