Lightweight PUlleys

[melicha8]

No, I don't mean underdrive pulleys. If 85% of HP comes from reducing weight of the pulleys why doesn't someone make some lightweight pulleys without reducing the diameter. Wouldn't this keep the harmonic balance? I think this would be a cool idea since it is a compromise between performance no loss in power to the aux pumps. Any opinions anyone?

 

[promp3]

um it think you got it mixed up a lil bit

 

[melicha8]

No I don't that is exactly what it says on the corksport website

 

[ARD MP5]

I've thought the same thing bro for at least 5 years now. And I don't know. lol. I think they should just Machine some pulleys that are billet aluminum or something.

There must be a reason. I think it's cause people want more function for their money and hypothetically someone who is worried about the single percent or so they will gain in power would always be running at high RPM's and cavitating the Water pump. This could have a worse effect than the added couple horsepower.

The real solution is to disconnect the A/C, lol. Any other accessories all together.

I don't think there will be major performance gain from the pulley itself. I think you'd really just worry about the main drive.

 

[alec172]

It works just the same as balancing a tire on a rim. It's add-on weight to a specific moment that will balance the system. If your balancing weight on your tire was made of titanium, it would be uge. It has nothing to do with size.

If you want to minimize your Hp loss, I suggest looking at changing your flywheel instead. More expensive but you get noticible gains compare to the pulleys.

 

[alec172]

well, a little bit on size (moment), but mainly weight.

 

[purePro5]

Just take the power steering and AC belt off. Drive it for a while, if you don't like it put it back on. This will give you about the same feel as underdrive pulley. A liitle better pickup, but not that noticeable.

 

[twilightprotege]

melicha8, you're right, 85% of the increase comes from the reduction in weight. BUT, i think what the others are thinking is the harmonic balancer. i assume you're talking about the accessory pulleys? the cost/benefit of replacing those with lighter ones is minimal, it's just that the harmonic ballancer is so god damn heavy in the first place that it makes such a big difference.

on my previous car (civic) i had all the pulleys replaced with unorthodox racing stuff. i had no problems at all with the engine, and i did notice a fair difference in response. i was very please with them. the problem with them is when you start making more power than original, the engine will become a little too unbalanced and that might create problems.

i will be getting pulleys for my P5 in the near future, i will also be getting a turbo in the near future....but having said that, i will totally rebuild my engine and balance it absolutely perfectly...in other words, a harmonic balancer wont be needed.

just before anyone jumps up and down and also to set the record straight, a harmonic balancer is ONLY used by car companies to reduce costs. it is a very very very cheap way of balancing an engine. i use the example of alec172 - it would cost a small fortune to perfectly balance a wheel in the factory - that's why they just use weights to do that.

later