Friday, November 21, 2014

Lexus UCF30 Monoblock to Ralliart Colt Dog Bones - 320mm Evo Disc Setup

After much looking for brake options I decided to follow what FullBlast did. It seemed the logical choice :) /ls400ucf20-or-ls430ucf30-front-brake.html
 - lightweight
 - radial mounts
 - low profile (fits 16" wheels)
 - monoblock
 - cheap
 - built originally for a V8 Lexus + similar design is used by TRD (uses same rebuild kit as TRD item /monoblock-rebuild-kit-04479-50130-lexus.html)

Other options were the Nissan R32 GTR setup, non brembo & GTO Mitsubishi 4pots.

Ok then it was onto rotors, originally they were for a ~300mm setup.
The 294mm I am using is hard to come by, plus even harder for a two piece setup.
So then I looked at GTO rotors ~310mm, but they are no longer made.
Hence the typical Evo 320mm will be the only logical option, still used by the Evos today with lots of after market options.
Reason why I was sticking with Mitsubishi rotor setups is because of the hats, hub bore, heights are all the same.  Only difference is PCD, which is an easy change.
Little bit on the rotors:
/calipers-arrived-ucf30ls430-sumitomo.html


So rotors are picked, calipers are picked then the design.
/upgraded-brake-production-resumes-money.html
Started in CAD measuring everything I could. From centre points, offsets, lengths and cutouts.
Then used that template and measurements to make my wood sample.


Then off to my trusted machinist to work his magic. We discussed metal options and decided on aircraft grade 7075.  Its twice the cost of a 6061, but twice as strong.  So we went over kill and picked that over the 6061 you see commonly in car parts.





My 294mm Evo IV RS setup vs the future 4pot monoblocks 320mm
/new-track-pads-elig-rs709-evo-1-3.html

Currently it mounts with M14 95mm bolts into a helicoil M14x1.75 (should have gone fine thread, next version). M12 35mm attach it to the hub 12.9g



5 comments:

  1. Hi, im richard from Malaysia. Im interested in the brakes conversion. Is it possible to share the measurement for the brackets? I would like to make a pair of the brackets for my car to use the lexus 4 pot. Thanks.

    ReplyDelete
    Replies
    1. Sorry mate, I wont share final dimensions after spending $$$
      In Malaysia it is probably cheap, but here it cost me $800+ to do the RnD

      Delete
  2. Will you be able to make another set and post to Hong Kong if I buy from you instead? Thank you

    ReplyDelete
  3. How much for the brackets? Email me price at h3ll_rayza@yahoo.com

    ReplyDelete