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02-22-2024, 10:55 AM | #155 | |
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So in general, no. However, you can get the 370mm version F calipers and install the 370mm rotors. |
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03-07-2024, 03:52 PM | #156 |
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I thought I would add this information. I saw people adding front rotors/calipers without a rear upgrades and worried about the brake bias implications. I've done in excess of 10,000 track miles with half of those in a heavily modified MKIV Supra. I went through several brake configurations over the years and have a basic understanding of some of the pitfalls. Adding larger rotors and pads help with heat management and rotor/pad life, but adding more front brake bias is not good. You spend a meaningful amount time at less than 100% braking (trail braking) and this puts a greater load on the front brakes and reduces rear brake pressure. This uses less of the rear tire contact patch and can actually lengthen stopping distances. In most cases you want to add more rear bias to reduce stopping distances. Because of this, I decided to run some basic calculations to understand the impact of the BMW 135 front brake "upgrade" used by many. Don't get to caught up in the actual numbers as I used some basic assumptions for the pedal ratio, master cylinder piston diameter and resulting line pressure. The differences are more important. The good news is though the 135 front brakes have larger diameter rotors (more leverage) and visually larger caliper, the actual brake torque is less than the stock 35i front brakes. This means 135 front brakes and 35i rear brake are a nice street setup with the ability to dissipate more heat than the stock brakes and still have good brake balance. Using the 135 front brakes with the stock 35is rear brakes actually keeps the bias almost identical to the stock 135 and Z4 35is setup. Please let me know if I have any of the specifications for the rotor or piston diameters incorrect and I will update the sheet.
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03-30-2024, 09:08 AM | #158 |
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No mention from anyone of coding ‘performance brake’ option in VO?
Discuss!
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11-05-2024, 12:48 PM | #159 |
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380 mm F series upgrade
Trial fit of 380 mm 30 mm M4 disc with series 4 pot caliper..
Caliper looked big in isolation..not looking so big now!
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11-08-2024, 08:30 AM | #160 | |
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I think there are more mods to do with DSC module and others...i think the biggest issue is the initial brake feel... Certainly would be interested in what is offered for the Z4 as tweaks but I'm not really interested in addtional part replacement performance mods for my Z4 other than the simple stage 1 MHD tune |
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11-08-2024, 03:59 PM | #161 | |
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11-09-2024, 09:48 AM | #162 |
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11-09-2024, 12:19 PM | #163 | |
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The bigger swept area and bigger area pad should offer increaed friction Apart from coding on an E89 there's not much you can do..the brake servo isn't interchangeable.. All E89s run the same servo irrespective if the sizes of the front and rear stock brakes..from 300 mm front and 284 rear through to 348 and 300 rear
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01-17-2025, 01:24 PM | #164 |
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Previously I’d discussed the evolution of various BBKs for E89s…
Of course there are several manufacturers and suppliers that will do bespoke BBKs for the front of E89s..it’s relatively simple for the fronts as essentially the E89 has the same fundamental front end design as non M E90s and E82s..give or take some offset/king pin issues.. So Alcon, AP racing and Brembo all do BBKs..around £3,000 upwards .. Also Ceika and Performance Brakes in Taiwan and HK do pretty ones too..again same prices for decent multi pot bigger brakes.. My and others search has been about exploiting off the shelf products from BMW and their suppliers .. Many folks even some E89s have gone down the route of F series M cars with 4 pot Brembo attached to 340/70/380 mm BMW discs.. My example in gold with a 340mm caliper upgraded to support a M2/M4 380mm disc..(caliper is the same for all disc sizes..just the mounting bracket size changes) However..whilst I’m playing and following on from my success with creating 345mm and 370mm rear BBKs for the E89..s much tougher challenge due to the unique rear brake system of the E89 with integrated electronic parking brake..I couldn’t resist this next challenge. And so..here is the next project..the Brembo BIG BBK using 2017-2023 Shelby Mustang Brembo made calipers sold and used by Ford on the 526-650 BHP versions.. The reason for this..apart from..because you can is.. These calipers..made by Brembo retail through the Ford dealer network for around 375 dollars ..but..you can get them discounted to around 250 USD..ironically the bright red ones are a few dollars cheaper than the matt grey version..red was for the the 350 GT the grey for the 350.. These are a monobloc design ie cast in one piece which makes it more difficult/ expensive to machine than a two part design as used on the M Performance /M2/M4 calipers..go figure.. For the E89 this is married to the same M2/M4 380mm diss but with a lot more pad and clamping force.. A US company has made an adapter bracket which I’ve imported.. However there are some issues to resolve.. First is front / rear bias.. So my BBK calculator..(others are available)..allows one to model the impact of various front / rear brake setups on the front / rear bias.. This BIG Ford based Brembo kit pushes the bias forward a lot in the absence of an E89 rear BBK.. However ..the B21 370mm rear E89 BBK brings the bias into the range between the 35is and the other E89s ..ie normal.. Second issue is master cylinder ..size ie bore diameter and leverage on the pedal.. This is an imponderable at this stage.. Some people…almost all in the US have tried this on E90s..some report some ‘soft’ peddle issues.. Others no issues.. Complicating matters there are two electronic options.. The E90/E89 has an option in the Vehicle Order to code ‘SPBR’..BMWs then 6 pot Brembo…however this boy is a bit bigger all round … Secondly ISTA offers DSC recalibration..where the DSC recalibrates its management of the calipers pads by analysing the current forces acting on the discs / pads and recalibrating its system to ‘optimise’ response.. Frankly until it’s all bolted up..programmed and tested..who knows.. You’ll be relieved that I’ll be refinishing the Brembo in a touching Phoenix Gold…. Pics show a rear caliper of a F series about the same size as an E89 front caliper ..plus the 340/370/380 BMW/Brembo front caliper and the FoMoCo/Brembo Shelby Mustang front caliper plus their associated pads.. Enjoy!
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01-19-2025, 01:03 PM | #165 |
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Attention moves to the front end..the existing BBK..the trusty E82/E90 6 pot Brembo with 338mm x26mm discs removed for the new owner..
Current plan is still to fit the big Shelby Mustang Brembo 6 pot (bigger pots) with M2/M4 380mm 30mm discs.. However here’s the F series M Performance caliper (340m with adapter for 380mm discs)… Also trial fit of 380mm M2 front dust shield..will need a little work but 3 out 4 holes line up.. The M Performance caliper is slightly lighter..the old Brembo s bit chunkier..but it does have harmonic weighs bolted on.. Enjoy..
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01-20-2025, 12:36 PM | #166 |
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Brackets for the 345mm E89 rear BBK arrived from the shop..
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