Why does nooone make a lightweight crank pulley for our cars? I know underdrive pulleys are available for our cars, but I don't really wanna go that route if I can get the same gains with a stock sized pulley that is lightened. Am I missing something?

http://3sxperformance.com/engine.asp

You want to use something other then hardened steel? (which i think the stock one is made out of)

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~Chris
03 SRT-4

why would you not want an UDP? AFX's is billet aluminum. A fraction of the weight of the OE damper. I am confused why you would not want the UDP. It will be less rotating mass on the crank as well as not making the crank spin the accessories as fast.

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2012 2500HD LML

I'm betting he's just scared off by the prospect of having heavier power steering or having his battery die because alternator is being starved.

this absolutely will not happen, just get the UDP!!!!

FS: 2.5" Test Pipe 25 shipped

FS: 2.5" Test Pipe 25 shipped

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~Chris
03 SRT-4

1. I dont want to underdrive my accessories at all.
2. AF/X pulley is aluminum, so is the 3SX stock sized pulley. The AF/X underdrives and the 3SX does not. Both give similar gains. I'd be much more happy with a stock sized pulley because you could retain stock sized belts, your lights wont dim, stereo wont suck, etc..

I'm surprised as how noone is making these. I've been a member of 3si for a while and those guys love the stock sized aluminum pulley.

I have never seen a UDP cause the lights to dim, p/s to be starved, or stereo to suck. Unless you are using some ghetto UDP that is overly small on small alternator car.

Either way a UDP on a DSM is not going to yield those problems. Do what you wish.

As said before, "to each his own"

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2012 2500HD LML

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I'm the guy that bans you for breaking the rules. I am the troll killer. I am the law here.

uhm, a high percentage of everyone here has successful gains with it and no problems. your friend proabably has the wrong belt sizing or he's not tightning his belt to well. both AFX and UR pulleys are good, and w/o a doubt free HP. oh well you're missing out. most of us don't have that problem.

Unorthodox UDP's are 50% underdriven. You wouldn't noticed being underdriven that little.

With your ground kit woodley, an optima yellow top battery, and platnium terminals I get 14.0v at IDLE (increases slightly w/ more engine speed) w/ my AF-X 33% UDP. BTW my car/alternator have 150k miles on them.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

just get the AF/X UDP.

you will like it.

i've never heard a complaint about it, other than the fact that it's a PITA to take off.

IMO there are NO drawbacks to using this part. you will not notice a difference in power steering. your battery voltage will be 13.5+ volts at idle.

besides, the whole idea with an UDP is not that it turns the accessories slower, but that the new pulley has a much smaller raidus. a long time ago i took a course in Physics and learned about center of mass, laws of inertia, and other things. the greatest gains is because the pulley has a smaller raidus which brings all of the mass closer to the center. ever watched figure skating when they twirl around like a top and then they bring their hands close to their body and they speed up? same idea. the fact that it's made of high quality aluminum is another bonus, because aluminum is a lot lighter than steel.

aluminum also has a much higher heat expansion rate than steel. this means putting on the AF/X UDP is a breeze. stick it in the oven for about an hour at 500 degrees and it will slide right on the hub like a fat chick going down a slip and slide. oh, the mental images are horrible.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

Thanks Joel, thanks Nathan. I really appreciate your help in clearing things up.

Ghettoraid, wtf? are you calling someone else's car a POS?
supercharged V6 > RS IMO...

Originally posted by JWoodley
Thanks Joel, thanks Nathan. I really appreciate your help in clearing things up. Ghettoraid, wtf? are you calling someone else's car a POS? supercharged V6 > RS IMO...

FS: 2.5" Test Pipe 25 shipped

Originally posted by turbo8u

Originally posted by GhEttOrAiD

Originally posted by JWoodley Thanks Joel, thanks Nathan. I really appreciate your help in clearing things up. Ghettoraid, wtf? are you calling someone else's car a POS? supercharged V6 > RS IMO...

If an underdrive pulley causes the motor to DIE at idle... that just sends up a red flag for me. "someone" has obviously done something horribly wrong!!

lighten up dood, we're all friends here. are you to high strung to have a reasonable conversation without bashing someones car? just chill out like uber said, comments like that arent needed, they'll get you know where....you're going to have to learn that quick here on 2gnt edit: woodley, the af/x udp works wonders, i have it and i love it. i also have a custom ground wire kit and the alternator is ground, i see 13.9-14.0 volts at idle and around 14.3 while driving, its fine. or like ^^^ said, optima battery. edit again: they also sell high output alternators for our cars if you're seriously worried about it _________ 96 talon esi-t san clemente, ca as needles of ice are the ill winds' talons the coldest of shadows they seep unto the bone

FS: 2.5" Test Pipe 25 shipped

Oops, I wrote an UR UDP is 50% underdriven, I knew it was ~15% larger, I just did my math the wrong way.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

turbo8u, you always have good advice. thanks bro. points for you! looks like i'll be sending out some money soon. how necessary are the upgraded belts?