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Go Back   RacingBrake Forums > Category > Group Buy > BMW

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Old 09-20-2012, 11:45 PM   #1
racingbrake
 
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Default BMW 335i Brake Upgrade

This thread is for the 335i brake upgrade Group Buy. The GB will offer three options:
  1. Two piece rotors upgrade
  2. Complete OE size two piece rotor kit, or for previous RB two piece owners to purchase PU (Progressive Upgrade) kit; RB big 4 piston calipers and adapter for an affordable brake kit (retain the same two piece rotors)
  3. Purchase the BBK (rotor will be 360x30 - Same as E90 M3); 380x32 BBK also available!

This GB discount will be:

15% for 5+ orders
20% for 10+ orders
  1. Front two piece rotor set (348x30): Regular cost: $950.84 GB cost $760.68 (-20%) or $808.22 (-15%)
  2. Complete OE size brake kit (348x30) :Regular cost: $2,606.47 GB cost $2,085.17 (-20%) or $2215.49 (-15%)
  3. Big brake kit (360x30): Regular cost: $2,960.55 GB cost $2,368.44 (-20%) or $2,516.43 (-15%)
  4. Big brake kit (380x32): Regular cost: $3,256.60 GB cost $2,605.28 (-20%) or $2,768.11 (-15%)
Above brake kits are good for the following models:

- 128i (2008-11)
- 135i (2007-11)
- 325i (2006-11)
- 328i & 328xi (2007-11)
- 330i & 330xi (2006-11)
- 335i (2007-11)
- 5-series (1997-03)
- Z4 (2010)

Kits (Stock or BBK) discounts will include package discounts, plus we will offer "wheel stud conversion kits" for free so your overall saving can be around 25-30%.

Here is the official sign up list:

1)
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Old 09-24-2012, 11:12 PM   #2
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OE Size Kit (348x30):

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Old 09-25-2012, 04:50 AM   #3
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360mm Kit:

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Old 11-13-2012, 07:55 PM   #4
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Hello,

Just keep you updated, we just have the adapters made for 360x30 BBK, which will be test fitted and pictures posted.
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Old 11-15-2012, 07:16 PM   #5
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How is brake bias affected if using the OEM kit or the 360mm BBK?

I just did some measuring and it looks like the 360mm BBK fits nicely under me Kosei 17 in track wheels.
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Old 11-16-2012, 06:21 AM   #6
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Rotor size is the only one of the several factors that can affect the brake bias, while the diameter increase is only 1/2" (from 348 to 360mm) so it should not be a concern at all.
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Old 11-16-2012, 07:26 AM   #7
N55pr
 
Default brake bias

thanks

I did some rought paper and pencil calculatiosn and the brake pad contact surface area of the D1149 FMSI appears to be 10-20% more compared to a Hawk DTC-70 OEM sized pad. So larger rotors, more pad surface, race compounds, etc. lead me to believe brake bias will be affected. I am an engineer, know nothing about this brake stuff...just my common sense thoughts.

Stoptech claims their bbk is "balanced" and that you can upgrade just the fronts with their ST60 caliper without affecting brake bias. This is an attractive selling point to me. However their BBK does not fit my wheels, plus is more $, but seems it is pretty much guranteed it will work well in the 335i. What would be your response?

I am on the edge, your product seems to fit my needs nicely...
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Old 11-16-2012, 07:27 AM   #8
N55pr
 
Default brake bias

thanks

I did some rought paper and pencil calculations and the brake pad contact surface area of the D1149 FMSI appears to be 10-20% more compared to a Hawk DTC-70 OEM sized pad. So larger rotors, more pad surface, race compounds, etc. lead me to believe brake bias will be affected. I am an engineer, know nothing about this brake stuff...just my common sense thoughts.

Stoptech claims their bbk is "balanced" and that you can upgrade just the fronts with their ST60 caliper without affecting brake bias. This is an attractive selling point to me (it could be marketing BS for all I know) However their BBK does not fit my wheels, plus is more $, but seems it is pretty much guranteed it will work well in the 335i. What would be your response?

I am on the edge, your product seems to fit my needs nicely...
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Old 11-16-2012, 08:00 AM   #9
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Quote:
Originally Posted by N55pr View Post
thanks

I did some rought paper and pencil calculations and the brake pad contact surface area of the D1149 FMSI appears to be 10-20% more compared to a Hawk DTC-70 OEM sized pad. So larger rotors, more pad surface, race compounds, etc. lead me to believe brake bias will be affected. I am an engineer, know nothing about this brake stuff...just my common sense thoughts.
Brake force (F) is a resultant of hydraulic pressure (P) and caliper piston size (Area:A), the larger pad area will provide larger heat sink and better insulation preventing overheat thereby your brake can run cooler and reduces the pad/rotor wear but is not a part of brake bias factory like the compound (COF), or torque arm (rotor diameter)

Quote:
Originally Posted by N55pr View Post
Stoptech claims their bbk is "balanced" and that you can upgrade just the fronts with their ST60 caliper without affecting brake bias. This is an attractive selling point to me (it could be marketing BS for all I know) However their BBK does not fit my wheels, plus is more $, but seems it is pretty much guranteed it will work well in the 335i. What would be your response?
This is an untrue statement made up by them to deceive consumers. It seems the real reason for not offering the rear BBK was due to the rear BBK involved drum e-brake which is not easy to make (you must disable your e-brake with aluminum hats, unless the hats are inserted with iron liner like RB's).

An intelligent consume should suspect/question if what the claim is true then what's the point of upgrading the front to BBK?
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Old 11-16-2012, 10:24 AM   #10
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I couldnt help but run some numbers on piston area:

Stock OEM caliper has single piston, measured from the footpring of the psiton on the pad it is 55mm in OD. Piston area 2,375 sqr mm

Stoptech ST60 has 4x 30mm and 2x36mm pistons, area of 4,860 sqr mm

RB 4 piston has 2x40 and 2x44mm, area 5,551 sqre mm

If my calculations are correct your kit has 2x the piston surface area over the OEM and has 8-9% more A than Stoptech.

I seem to be the only guy interested in the GB, which is puzzling to me.

Can I piggy back on the E46 GB to purchase my BBK? When will the 360mm kit be availabe to ship?
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Old 11-16-2012, 10:47 AM   #11
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Quote:
Originally Posted by N55pr View Post
I couldnt help but run some numbers on piston area:

Stock OEM caliper has single piston, measured from the footpring of the psiton on the pad it is 55mm in OD. Piston area 2,375 sqr mm

Stoptech ST60 has 4x 30mm and 2x36mm pistons, area of 4,860 sqr mm

RB 4 piston has 2x40 and 2x44mm, area 5,551 sqre mm

If my calculations are correct your kit has 2x the piston surface area over the OEM and has 8-9% more A than Stoptech.
For OE floating type calipers, you have to multiply by 2 to get an effective area so being OEM is 50mm the area s/b 39.27 cm^2
Stoptech 4x30, 2x36 s/b 48.6 cm^2
Our pistons size are the same as Brembo's F40: 2x40, 2x44 is 55.5cm^2
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Old 11-16-2012, 11:04 AM   #12
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Can I piggy back on the E46 GB to purchase my BBK at GB prices?

I saw that you just got the brackets in, when will the 360mm kit be availabe to ship?

Black calipers available?

thanks
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Old 11-16-2012, 11:07 AM   #13
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Quote:
Originally Posted by N55pr View Post

I seem to be the only guy interested in the GB, which is puzzling to me.

Can I piggy back on the E46 GB to purchase my BBK? When will the 360mm kit be availabe to ship?
We have one kit available for promotion which is ready to ship. However this kit is reserved for one customer who has been helping us posting in BMW forum, so we are waiting for his response. If he is not interested then we can sell the kit to you.

Also I would remind you to double check the wheel space requirement, I doubt it will fit 17" you may need 18".

We have more kits to ship in a week or two so we can sign you up on the list. Once it's known to other 335i owners I am sure the list will quickly fill up especially with different choices available.
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Old 11-16-2012, 11:14 AM   #14
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Picture with the actual rotor (360mm) & caliper installed on 335i spindle.

Note this set up uses the same hat as the stock (348x30 rotor), but with M3 stock rotor size (360x30)


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Old 11-16-2012, 11:19 AM   #15
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I printed the Stoptech template and used it to measure the clearance. I have 196mm radial clearance iside my wheels and your 360mm kit diagam shows a radial dimension of 191mm. I took into account the axial dimension of the caliper as well when checking, the caliper extends 12mm out from the rotor hat surface. I shoudl have 5mm clearance....yes its tight.
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Old 11-16-2012, 11:42 AM   #16
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Quote:
Originally Posted by racingbrake View Post
Picture with the actual rotor & caliper installed on 335i spindle.


is this the 360mm rotor? looks very nice!
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Old 11-16-2012, 11:52 AM   #17
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The is a 360x30 (same rotor as M3) set up.
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Old 11-16-2012, 12:01 PM   #18
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Quote:
Originally Posted by N55pr View Post
I printed the Stoptech template and used it to measure the clearance. I have 196mm radial clearance iside my wheels and your 360mm kit diagam shows a radial dimension of 191mm. I took into account the axial dimension of the caliper as well when checking, the caliper extends 12mm out from the rotor hat surface. I shoudl have 5mm clearance....yes its tight.
Our experience tells us for a rotor size over 332mm (13") would require 18" wheels.

The rule of thumb is to add 4" (50mm) to the rotor size for the wheel size:

For example:

13" (332mm) rotor kit --> 17" wheel
14" (355mm) rotor kit --> 18" wheel
15" (380mm) rotor kit --> 19" wheel
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Old 11-16-2012, 12:39 PM   #19
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OEM rotor is 348mm and I track my car with 17" wheels with plenty room.

Apex ARC-8 17in wheels clear the Stoptech BBK for 335i, my Kosei 17 do not by 5-6mm (2-3 mm plus 3-4mm clearance)

If the diagram posted is accurate, I should have 5-6mm clearance. You will have a lot of people interested in your 360 x 30 mm if you kit clears some 17in wheels like the Kosei which are popular.

Is it possible that your caliper has a lower/thinner profile than the ST60? It does have fewer pistons so it may be a bit more compact.

I will be glad to test fit the kit for you
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Old 11-16-2012, 06:30 PM   #20
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Quote:
Originally Posted by racingbrake View Post
Picture with the actual rotor (360mm) & caliper installed on 335i spindle.

Note this set up uses the same hat as the stock (348x30 rotor), but with M3 stock rotor size (360x30)


Looking at the picture, it seems that the ends/tips of the caliper are further away from the center of the spindle the the center of the caliper. Is 190mm radious measurment the max the caliper sticks out from the center?
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