ud pulley concerns

[2005g35]

just a quick question, I bought a 2005 g35 sedan as a daily driver and want to add some minor bolt ons.

question:

on the g35 is the crank pulley the harmonic balancer as well? and also are you concern about vibration at high rpms with a lighter UD crank pulley?

thanks,

[tollboothwilley]

Yes, the stock crank pulley is also a harmonic balancer.

I haven't heard anybody have any issues with using underdrive or just lightened crank pulleys or the whole pulley set.

I'm running a UR lightweight crank pulley.

If i was running FI then I would probably not do anything with the pulley because those vibrations could cause much more of an issue under that kind of pressure.