I was wanting to buy an af/x underdrive pulley but heard that it messes up the roation of the crankshaft and will give me problems later. If anyone has any comments please say

Do a search, this was discussed before and the same conclusion comes up.......That it is a bunch of BS. I am by no means an expert on the internal combustion engine, but I have a UDP along with the majority of peeps on here and I don't think anyone (since I have been here) has experienced any problems caused by a UDP.

AFX UDP is one of the BPUs most here would consider MANDATORY. Whoever told you it's a bad idea is no one you want to pay to work on your car. Buy it. Rent the tool and install it yourself in about an hour. You WON'T regret it.

Welcome to the family. Stick around and learn many new things grasshopper. :P

on alot of engines UDP can harm the motor the 420a it doesn't...

Bill

>on alot of engines UDP can harm the motor the 420a it
>doesn't...

Very true. It can be a bad addition to some engines. The 420A loves it :thumbsup trust me, you'll like the power increase

Yup, 420A does not have a balancer pulley, just a damper. There's no damage and I say less strain on the engine due to the lower rotational mass. There's less stress now, buy, install and enjoy.



15.9 @ 86.7mph

Smooth idle? We don't need no stinking smooth idle.

Mods List:
http://highlander.dsmpower.com/sig.htm

ive had it for almost 2 years now and no problems .. the install isnt to bad and you'll enjoy the quicker revs ... from what i hear our factory crank is very well built and is quite strong