New 11" 4 piston front kit

[bwh13]

We have figured out how to use a production rotor that has almost the exact offset as the stock E30 rotors, plus it has the same face thickness so no spacer is needed for the hub centric.

This rotor WILL stand up to race conditions as it is from a $50K sports car and these cars are tracked all the time. Plus they are only $60 each to replace. The rotors WILL have 1 hole that overlaps the current bolt pattern.

Before anyone starts questioning this, please keep in mind we have been selling rotors like this for the past 10 years with ZERO issues. The stresses placed on the rotor ARE NOT directed at the overlap hole area. We could make a 2 piece design but it would raise the kit price by at least $300.

We'll mock up the kit next week to determine final bracket specs and offer them starting Jan 2. Expect a price of around $800 retail, the R3V price will be $675.

We will use the Wilwood Dynalite calipers with BP20 pads. Kit will include the Wilwood calipers, BP20 pads, 6061T6 aluminum brackets, rotors, brake lines, attaching hardware.

Optional calipers will include:
Dynapro 4 add $20
Dynapro 6 add $270

[dude8383]

Very cool! Glad that there are more vendors making kits for our cars :)

[rhett325i]

so you are now offering an 11.75" rear kit, and an 11" front kit? that seems a little backwards to me.

[bwh13]

We have 2 11.75" front kits (or rather a 11.75" front 2 piece rotor kit, and an 11.8" 1 piece rotor kit).

The 11.8" kit is available with either the Dynalite or Dynapro lug mount 4 pot calipers, or the Dynapro 6 pot calipers.

The 11.75" 2 piece rotor kit is available with the Dynapro radial mount calipers with dust seals or we can also fit the Superlite 6 piston radial mount calipers.

The 11" kit is for those who don't feel the need to upgrade the rear brakes.

[StereoInstaller1]

So this is the Audi TT rotor, right?

Lets see some pics, yo.

[bwh13]

No the TT uses a 312mm (12.28") rotor, which usually has 10 holes in the hat face already...making it hard to put a 4x100 pattern in it.

There is an Audi rotor that is 288mm...but it is heavier than the one I will use. Usually a rotor around 14-15 lbs is plenty for cars of the E30 size/weight.

[StereoInstaller1]

I have looked at 3 or 4 TT rotors...saw nothing but the normal 5, plus the locater.

What am I missing? I am no expert on this, but a 12" rotor is perfect for a 17" wheel, IMO.

I only need the looks, my car stops mostly fine.

[bwh13]

I'm going by the illustration in my rotor catalog. For the TT it shows multiple holes. If they are only 5 hole, then putting the 4 x100 pattern in them would be easy.

[WhatWentWong]

Is this the essense of this rotor setup? Re-drilled 5x112 Rotors? I don't think you can get away with less than two sets of 'close-to-overlapping' holes.

The criticality of this has come up many times here before, but for wheels. I agree with you though, this isn't so bad for rotors since the rotor hat is compressively loaded between the wheel and the hub, so a slightly messier bolt pattern isn't going to have a huge structural impact. But, like you mentioned, you should expect resistance here on R3V about this. It'll be a big deal for some, and a non-issue for others.

I hope to see some pics of a prototype or a mock up soon!

[bwh13]

The overlap will only be on 1 hole, and it is approx 1/2 the diameter of the hole. With 3 other holes and the hub centric assuring the rotor will not rotate into an out-of-round position, plus the 80 lbs of torque on the bolts, the rotor isn't going anyway anytime soon.

We've been using this same technique on a couple of kits we make for about 10 years on many track only cars with zero issues, so I don't expect any mechanical issue.

Aesthetics and general resistance to something not conventional is another matter.

Picked up the rotors today and will test fit it to my car tomorrow. Will take some pics and post as soon as I finish.

[bwh13]

OK test fitted the new rotor onto the car, but did discover the face thickness is not as much as needed, requiring a 2mm spacer to allow the wheel to mount flush with the centric. I really thought this one would work. This rotor requires a hub centric ring, so it may be possible to make the spacer/centric ring as one piece to resolve both issues.

Bracket fit just fine, so only need to resolve the rotor issue. I'll check another rotor today and see if it has the correct face thickness...

[bwh13]

OK checked the other rotor and it has a similar issue as the one I originally planned to use; the face thickness is less than the E30 rotor.

Looks like no matter what rotor we use a spacer of some type will be required (unless we use a 2 piece rotor, in which case the hat would be made to the same thickness as the E30 rotor).

I have designed the spacer and will get a pair made this week to confirm the dimensions.

The spacer can be re-used so they will be a 1 time purchase (the cost will be factored into the kit costs; I don't expect any change in the estimated pricing).

[T Verdier]

if I'm already running spacers I'll be fine? Or will I a different hub sized spacer?

[bwh13]

The spacers I'm referring to are to place the rotor in the correct position on the hub to ensure the wheel to hub centric position is correct.

The E30 uses a thick 'hat' area compared to most other rotors, so we have to either move the rotor into the proper position or place a spacer between the rotor 'hat' and the wheel that will have the correct centering dimensions for the wheel.

[bwh13]

We have finished the 11" front kit and have come up with 2 versions, a standard and a heavy duty.

The Standard kit will use a 282mm x21mm rotor, while the HD version will use a 282mm x 28mm rotor. Either of these rotors will work well on track cars. We make several kits using the 282mm rotor and they typically last a whole season before replacements are required.

Both kits fit easily in the TR 15x8 wheel so other wheels with similar clearances will fit.

The HD kit will cost $20 more than the standard kit. The kits use a different caliper due to rotor thickness and the HD kit uses a spacer/centric ring.

As we stated previously R3V members will get a discounted price on both kits. To keep the prices down, rotors will be plain. Slots/dimples would add approx $50 to the kits.

Kits will consist of:

282mm rotors
Wilwood Dynalite calipers (optional Dynapro calipers, add $25)
Wilwood BP20 performance pads
adapter brackets, hardware
Front braided steel brake lines

Standard kit retail price is $825, R3V members price $625, plus shipping.

HD kit retail price $845, R3V members price $640, plus shipping. Picture shows the $25 optional Dynapro caliper. Any questions contact us at sales@fastbrakes.com