UR Lightweight Crank Pulley Install DIY

[tollboothwilley]

After installing my lightweight crank pulley, I thought that if someone else wanted to do it they'd like a step by step DIY. I followed some instructions somebody else had done.

What you will need: 3/8" Socket Wrench with 14mm & 12mm sockets1/2" Socket Wrench with 19mm deep socketFloor Jack/Jack Stands

Jack your car up. Use jack stand for safety. I only raised the passenger side of my car and it was sufficient.Loosen the 14mm nut on both idler pulleys and loosen the tension using the 12mm socket.Remove Belts.

While you are under there, remove the nuts and bolts holding the sway bar bracket on each side.These are all 14mm. 1 nut and 3 bolts on each side.

With the sway bar out of the way and the belts off, now it is time to remove the crank pulley.Using the 1/2" socket wrench and 19mm deep socket. Trying to turn it now will just spin the crank.(see next pic)

With the socket wrench in place lower your car back to the ground. Remove the upper portion of the floor jack handle to use as an extension/breaker bar.Install your breaker bar and ensure that it is tight to the ground in a straight line to break the bolt loose.

You don't want the car to start while you turn the crank. Remove the ignition/ecu fuse. You only want to turn the key for just half a second. We are just breaking it loose. I used a 3/8" socket with a 3" extension first and broke the extension. Twice. Worked 1st time with 1/2".

Now that the bolt is loose, you should be able to spin it the rest of the way by hand. Remove Bolt.

Getting the stock pulley off took a little coersion. I tapped it with the end of the socket wrench a few times. Because it fits so tightly in, you will need to wiggle it side to side while you pull it off. Notice the difference in weight. The UR pulley weights about 2 pounds. My guess is the stock is around 8-10 lbs. I need to put it on a scale.

Use some WD40 to clean the area up a little. When that is dry use some white lithium grease to lube both sides of the pulley and on the crank where you will install it.

Push the new pulley on, making sure to keep the notch in the right place. Screw on the bolt, hand tight.

Now, jack the car back up and reinstall the sway bar brackets to their proper position. Use the nuts to hold it in place while you get the bolts started.

We need to tighten down the crank bolt now, but we face the same issue as before: you can't fully tighten because the crank spins. You need to hold the new crank pulley in place. I used some clamps like the picture. You can also use a tie down or some ring clamps if you can fit them over the sway bar. DO NOT try to use the cranking method to install, you most likely will cause serious problems.

Reinstall the belts, adjust the tension, then torque down the idler pulley nut. Reinstall the Ignition Fuse.

Start the car to make sure the belt tension is proper and no squealing.

Lower the car back down.

You're Done!

[G_whizz]

Phenominal!!!

Thanks for the effort and thinking of the other members John!!

So tell me...is this mod a must do? I have been toying with it since day 1.

Is it REALLY noticeable?

Thanks again for taking the time John!!

[tollboothwilley]

They say that you need about 200 miles to really get the full benefit by the ECU adjusting. While my results will not be optimal as I am still working out my idle issue, I can tell you that I can feel the difference. I can tell my ECU is playing catch up. I got about 20 miles on it since the install is all. Much faster rev up. Seems like the ECU is surprise to be at the shift rpm points so quickly.

I would say that this is a worthwhile upgrade for sure. I'll keep you informed as I get more miles and the car adjusts, and as I get the idle issue worked out.

The Stock pulley supposedly has a harmonic dampener, but I haven't heard of any problems from switching it out. Glad to have that fat piece of metal off.

I know Stillen came out with their own pulleys just recently as well.

[eZg001]

Excellent write up! Thanks

I paid an indy shop to do mine. Very noticable difference.

I am looking forward to a lightweight flywheel. I have heard that there is an aftermarket CF driveshaft availible for the 350Z but haven't been able to find on for our G's. Anyone seen one?

[tollboothwilley]

haven't heard anything about a CF drive shaft

hmmm

would make sense...

[4drsleeper]

Just put my pulley on last week and I've driven just over 200 miles now. I had the HFC's added at the same time so it's hard to say how much of a difference the pulley made, but between the two there is a deffinite difference. I think the ECU is still trying to adjust because under normal driving my cars seems to stay in 2nd gear about 2 seconds before shifting into third. 2nd gear is way to short.

[tollboothwilley]

HFC and the UR pulley make a big difference.I've only got about 100 miles on my UR pulley so far.

It'll be more once I get my idle issue resolved. It should be here shortly.

Then I will offer a full review.

[zozoka1212]

Sweeet bro.

Zozo

[suby01]

daam too bad the 07s dont have that much clearance.

[tollboothwilley]

I only have that much clearance because I did the E-fan conversion and I dont have the fans on there when I did the pulley install.

[suby01]

cheater!!!!!!!

[tollboothwilley]

haha. ya, I guess doing things the smarter way is cheating! LOL

[gmoney350Z]

what brand crank pulley did you get?

do you know if a crank pulley will work on a 350Z auto transmission???

thanks

[tollboothwilley]

UR (unorthodox racing) Lightweight Crank pulley (stock size, just light)

pulleys are the same between g35 and 350z

So, yes. You can use the same one on your 350z

Mine is a 5AT

[gmoney350Z]

ok yeah thats the one i was lookin at!

do you know whats the difference between Unorthodox Racing Ultra Series 12v Charger Pulley Sets (Stock Size) and the Unorthodox Ultra SS 3-Piece Pulley Set???

thanks

[tollboothwilley]

Stock size versus underdrive

Underdrive doesn't spin the accessory pullies as fast as normal.

Underdrive(faster) is ok if you don't have a stereo.

[gmoney350Z]

ok i think i get ya!!!

so you feel a big difference gettin off the line or what?

thanks

[tollboothwilley]

Its definetly noticeable. A worthwhile upgrade for anybody.

I would imagine that the underdrive pulley setup would be slightly more effective as well, but its diferent belts and I have a huge stereo that I'm not willing to part with.

[gmoney350Z]

ok i see

thanks for your help bro!!!

[tollboothwilley]

Anytime.