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underdrive pulley?


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I keep hearing about these underdrive pulleys but don't understand what it is. Is it a smaller, lighter bottom pulley or what? I've been working on cars in the motor trade for 14 odd years, just having trouble with the lingo. I have an N/A manual import, any serious poer gains from this mod?

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I'm only getting about 21 mpg for my N/A, i was told that the TT's do this as well, wondering if i should have bought a turbo.

Thats been done to death mate and people will never agree, but there are not many Zeds TT or otherwise that I would swap my NA for.

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Is the underdrive drive that much lighter to make a difference?

 

A lightened Underdrive Pulley is 9lb lighter than the stock pulley.

According to some reports, a 2.5hp increase can be gained for every pound taken off the pulley. That's approx 25hp gain.

However, I agree with Dave (Legrath). The main difference you'll notice, will be the the engine revving quicker and feeling a lot more responsive.

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