Pulleys 101...

MeetJoeAsian

I really have no intention of modding my car to gain anymore power and such...I did however kinda been thinking about getting another 350Z, pay cash for it, and just make it a project car....which KINDA led me to wanting to maybe do something here and there with my 370Z...

One of my coworkers have been nagging on me to get some NST pulleys for my car, and he said that all I would do is change out the OEM pulleys for lighter pulleys...I haven't been in the loop for over 12 years, and the last few cars I had, I never really cared to mess with, even when I had my 350Z...my whole intention of buying a powerful car is just so it is what it is...I don't plan on racing or showing it...but SOMEHOW, I've just been getting a little ITCH (you can say) to do a little here and there...

My buddy said the pulleys won't affect the car (as in messing up the engine)...now, I've read something about underdrive pulleys...what's the difference? And also, can someone give me a rundown of advantage of lighter pulleys or how it affects negatively or positively in the engine...from what I understand, when you change the pulleys, you're only changing the weight of the pulleys, and thus giving you better power? or something like that?

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Caravanshaka

Underdrive Pulleys - Use different diameter pulleys to adjust the ratio of turns per revolution of the engine. This effectively reduces the amount of power that gets transferred to your accessories (A/C, alternator, PS, etc), and nets you a slight gain in HP but has a downside that your accessories will not work to 100%

OEM lightweight Pulleys - They are identical to OEM, just made of a lighter weight material. Since the engine requires energy to rotate these pulleys, reducing the weight will make the engine not have to work as hard to get the same amount of power. Its like putting lighter weight wheels and tires on...same diameter, but requires less power to keep em turnin'.

Personally, I would go with an OEM size pulley set if I got one. I don't like the idea of my accessories running at like 80% of the norm.

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RCZ

+1 rep for a great answer Car.

Caravanshaka

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____________________ PROJECT DiaD - Sold but not forgotten!
The first testicular guard, the "Cup," was used in Hockey in 1874 and the first helmet was used in 1974. That means it only took 100 years for men to realize that in order to work the penis, the brain must remain whole.

MeetJoeAsian

+1

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NonStopTuning

All of your questions and more are answered in full depth in the following thread...
NST (NonStopTuning) 370Z VQ37HR Pulley Kit Review w/ Dyno Charts

You will also find user reviews from people who have actually owned and used pulleys on the 350 and 370!

Good luck and have fun with all your projects!

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