H&R 20mm Stud-Replacement Front Spacer Install

Alstann

Hey guys,

I did this install a couple months ago, but I finally found some time to do my write up and install on these spacers.

Having the 19in RAYS sports wheels, I decided the stock, sunk in wheels were a big no no in the looks department, and after much research on the forums, I decided to go with 20mm in the front, and 25mm in the rear.

I originally purchased a set of bolt-on 20mm/25mm PowerTrix spacers in the hopes my front studs would be short enough to accommodate just simply bolting on a spacer, but no dice. The stock studs were long enough to not let the spacer sit flat against the brake rotor. Lesson learned.

The rear spacer fit perfectly, though, and I still have the 25mm PowerTrix bolt on the rear of the car, and it's still perfect today.

I went ahead and purchased a set of H&R 20mm stud replacement spacers from a forum member here, and once I got them, went to work on installing them.

The Install:

I began with removing the front wheel, and then removing the "idiot bolt" on the rotor that prevents you from mounting the rear wheel to the front of the car. I forgot to take pictures of the removal of the caliper, but the DIY on this forum is great.

Personally however, I decided to remove the caliper completely out of the car, by dismounting the two bolts that hold the caliper to the car, and unscrewing the hard brake line on the backside. A quick tip to people that try this - the brake line will then start dripping fluid, so what to do is use one of the rubber plugs on the brake bleeder screws to plug the brake line and stop the flow.

Moving on to the rotor, I ran into one hell of a problem - the hub had already rusted itself and cold welded itself to the rotor. I tried EVERYTHING. I started with a rubber mallet, and moved into a 10lb soft sledgehammer, and even after using what seemed like a gallon of penetrating blaster and the muscle of the Hulk himself, the rotor wouldn't even budge.

I resorted to some crazy measures - I went to harbor freight, and purchased the largest gear puller they offered, and took it to the rotor:





The box the puller came in said it was for use in industrial diesel trucks and semi-trucks. The metal plate was a super thick piece of metal I bought at Home Depot - unfortunately, it bent like a piece of candy when I took the hydraulic puller to it. I forgot to take a photo, but I just put a big breaker bar socket there, and went at it again.

I pumped the puller around 10-15 times, and on the last pump, the rotor flew off the car about a foot and a half and nearly smacked the side of my garage. Needless to say, that was terrifying. I found it crazy after only 15k miles, my rotor was so hard rusted to the hub.

I did put the rotor back and and checked for warpage or runout with a dial indicator I own, and it was smooth as butter with no warp anywhere. Forgot to take pictures of the tool, sorry! I did this same technique with my previous SUV, albeit with a smaller gear puller, but it works the same. These are the biggest brakes I've ever worked on!

Either way, with the rotor off, I could proceed to hammering out the stock studs.



According to the DIY (http://www.the370z.com/diy-section-d...r-install.html), I had already went to NAPA and bought extra wheel stud nuts to hammer out with. One by one, I put them on, and took a deadblow hammer to the studs and hammered them.



Here are the stock studs compared to the H&R extended:



While the studs were off, it was a good time to lightly sand the hub free of rust and whatnot. A soft sanding block made quick work of the remaining rust on the surface. I also decided to apply some Anti-Seize on the hub so I would never have this frozen rotor issue again (opposite side hub, please excuse the picture discrepancy):



Again, like the DIY, I also had purchased a plumbing coupler at Home Depot and used it to fill in the dead space between the longer studs. I used my impact wrench to pull the studs through. I'm personally not sure how you would do this without one.



All the studs impacted and seated nicely:



Finally, it was time to put the rotor back on, and then put the caliper back on. Basically just reversing the removal steps of the caliper and rotor.

After that, since I removed the caliper completely, I introduced air into the brake line. I have a Motive Power Bleeder with the ford adapter that fits perfectly on our brake fluid tank.





The brake fluid I used to refill the tank was Valvoline Synthetic DOT 3/4 fluid from Pepboys, O'Reily's, etc. I've read it's basically the best fluid you can buy from any common auto parts store, and it'll do the trick for me.

The bleeder pressurises the system so that when you open the bleed screw, the fluid flows out smooth and nice. I let the fluid flow until I saw no bubbles, and considered the job done good.

Last but not least, it was time to just slide the spacer on, and mount the wheel on.

The Results:

I am completely happy with the results! The 20mm was PERFECT for the stock RAYS, and the wheel sits flush with the edge of the fender. I tried to capture it in pictures, but if you see a Z spaced out in person, you'll realize that 20mm in the front is absolutely perfect.











Also something to note, is that my front tires are 255/40/R19, and my rear are 295/30/R19. They are weird sizes, so take that for what you will.

The look from directly in front of the car is also insanely aggressive now - seeing the tires stick out from the car gives such a mean look!

__________________

Felix 808

Nice write up. The car looks good.

I have to get me one of those bleeders, I've been using the pump style for too long Searching internet now

__________________
Semper Fi

Μολὼν λαβέ

Benadrylz

I was planning to run a similar setup. Does it rub at all?

chrischhorn

Hmm.....I did mine and just left the rotor on lol. suspended the caliper in the air with a wire hanger and just knocked em through. Used washers to pull the new studs back forth. Bent the dust shield a bit to let the studs clear to get out.

__________________

R.I.P. 8/01/13 1SlowZ
One day I'll have another....

Alstann

When I was on stock suspension - I got ZERO rubbing, even with my weird tire sizes. It was perfect in every single way. I only ever got the car to rub if I was on full lock and I hit a bump hard. Obviously, something you don't do often, if ever.

That being said, I am now lowered on KWv3's, and with the front having less than a finger gap and the rear with one finger gap, I rub the front on hard bumps, and while turning I rub more. The rears do not rub whatsoever.

I also haven't installed my camber stuff yet, so my alignment maxed out at -2 degrees all the way around. If I try to fix my camber, I will rub even more in the front. I will definitely have to roll the front fenders.

Do you have the sport package on your Z? The brake line connecting the 4 pot Akebono's are hard lines, so you have to remove the caliper and therefore introduce air to the system. Thinking about it now, I suppose you might be able to leave the rotors on, but yeah, you would have to bend the dust shields. For most people with the sport package, the caliper will have to be removed and the rotor should come right off, so it's no biggie. I'm surprised my rotors were that hard rusted to the hub!

__________________

sparky

Next time just remove the idiot bolt, take the little spacer off of it, thread back in and tighten. The rotor will just pop right off with ease, no puller required!

__________________
2012 370Z GM 7AT/JWM LEDs / 3M clear bra / 35% tint / GTR start button / FI CBE SS 18" RES / Momo shift knob / K & N Typhoon / Z1 hood struts / H&R 20mm f/r / illuminated kickplates

Benadrylz

How far did you drop it on your KWv3s? I'm curious because I have a set of Eibach Pros coming in and plan to install it with 20mm spacers all the way around. Were you able to get your camber within spec or did you need a kit?

pfdaxe

I have the same size spacers (20f/25R) and did mine like this. No need for an impact.

That's exactly what I did. People make this a lot harder than it needs to be. I notice this quite often on DIY write ups.

Great pics for though

__________________
Build Thread: http://www.the370z.com/members-370z-...xes-build.html

cossie1600

Instead of doing all that work, just buy one of these tool for <$15

I swapped my studs out within 1 minute without impact tools

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1