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06-23-2015, 09:40 AM | #45 | |
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06-23-2015, 11:06 AM | #46 | |
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Here's a great white paper from Stoptech: http://www.stoptech.com/technical-su...alance-matters |
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06-23-2015, 04:00 PM | #47 |
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If the 135 stockers are that bad, why did bmw ditch the sliding style in the newer f8x M cars? They have 4 pot fronts and 2 pot rears now. I think the reason the 135 fronts hold so much heat is most race setups run 17inch wheels and super wide fronts.
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06-23-2015, 08:40 PM | #48 | |
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06-23-2015, 08:59 PM | #49 | |
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Anyway, this probably means few people have a factory brake bias with any sort of brake and/or suspension changes lol |
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06-23-2015, 09:15 PM | #50 | |
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06-23-2015, 09:34 PM | #51 | |
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http://www.turnfast.com/tech_handlin...ling_weightxfr |
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06-23-2015, 09:35 PM | #52 | |
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ps: saw your other thread on using 330 rotors, looking forward to seeing how it turns out |
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06-24-2015, 06:06 AM | #53 | |
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The brake proportioning valves on street cars are pretty much set, although you can easily install adjustable valves. Formula 1 cars have electronically adjustable proportioning valves, which allows the pilot to adjust the brake bias while driving. And, they do that often during a race, sometimes on every lap if there is a particular situation that calls for it, e.g. a corner where the pilot is experiencing lockup. Of course, they are also adjusting it more often as the current era puts such an emphasis on managing tire degradation. Playing around with their brake bias becomes one of the chores that F1 pilots have to keep them busy, as they are not busy heel-toe shifting and reaching for a proper gear selector. In my particular case, I did actually run the calculations, although I am having a hard time finding the paper where I scribbled my notes at the moment. But, as I recall, the conversion I did took my front brake bias up from around 63% to 71%. The biggest factor is the larger front rotor and the additional leverage it creates. I made some rough assumptions on the friction coefficients associated with the brake pads, as I could not find the actual data for these. Either way, it did not make a significant difference. The fact is that most manufacturers automatically build in front brake bias, because it is much safer to lock up the front wheels than the back wheels. But, let me tell you that I am still able to lock up the rear wheels under extremely hard braking, from high speed, with my new setup. I could interpret this to mean that under those extreme conditions, I probably want even more front bias. But, for normal street driving, and even spirited driving, this setup is more than adequate and still very safe. Very cool discussion; cheers! |
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06-24-2015, 08:37 AM | #54 |
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06-24-2015, 08:54 AM | #55 | |
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06-24-2015, 08:57 AM | #56 | |
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Well look at that - someone modded their car and actually put some thought into the details!! You guys are few and far between. Good on you for thinking this through! So based on the other thread Supergnat started (using 330i front calipers), is it safe to assume a 335 front caliper and Z4 35is rotor will NOT fit under 17" wheels? |
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06-24-2015, 10:41 AM | #57 | |
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I like the 207Ms and what I plan to do is get an extra set and use the 7.5" wheels in the summer, throw the 7" wheels on with winter or all-season tires those few weeks of the year when I need to and, if I ever get the time, a separate set of track wheels and tires. |
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04-25-2016, 10:49 AM | #58 | |
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part# are http://www.realoem.com/bmw/enUS/show...diagId=34_1476 : left - 34216768697 Right - 34216768698 Much appreciated! (firing the order tomorrow...) |
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04-26-2016, 03:15 AM | #59 | |
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http://www.realoem.com/bmw/enUS/part...&q=34216768698 |
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04-27-2016, 10:10 PM | #60 | |
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I'm not one of those folks who write off multi-pot as a gimmick. Multiple pistons serve to increase piston surface area and better distribute clamping force across larger pads. What kills the 135i brakes is the dimensions of the rotors. Where I think 135i brakes will stop as quickly as any M brake the first time, they will never hold up after repeated braking. 135i rotors have a smaller diameter then the M or even 335i rotors meaning reduced torque radius. 135i rotors are also thinner meaning they have less thermal capacity. This means the 135i brakes, while being able to brake as well as the M or 335i brakes, will heat up faster and be slower at dissipating that heat. Higher heat means reduced friction coefficient between the disk and the pad, boiled brake fluid and cracked pistons. |
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05-06-2016, 04:27 AM | #61 |
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Just did a set of 335i brakes to my 130i, everthing bolts right on, no modification required not even the dust shield. Is 128i rear handbrake module different from EU 130i? Because the handbrake shoe on my car works on 335i rear disc?
Front Rear Pedal feel remains more or less the same, but now with much better brake fad resistance.
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06-25-2016, 03:51 PM | #62 |
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Yes the handbrake is different between the 128i and the 130i. Doing this on a 128i will sacrifice the handbrake.
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01-23-2018, 01:42 PM | #64 | |
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Just one question, isn't the EBC red pads for track purposes? Was looking at yellow pads since the car is 90% street and 10% on track (during spring and summer). Last edited by Zombie_Head; 01-24-2018 at 02:14 PM.. |
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01-24-2018, 11:58 AM | #65 |
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Hi, quick question. So I have a 2013 e82 128i. I'm installing the BMW Performance Brake Kit on the front because the full front/rear kit seems to be out of stock everywhere and because I'm running 17" wheels (making it tough to bump up to F30 M calipers). For the rears, I have on order a set of F30 328i calipers. When buying matching rotors and pads, should I be buying 300x20mm rotors and pads designed for an F30 328i then, instead of rotors designed for a 128i? Or does it not matter? What about the rotor bolt pattern?
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04-15-2018, 03:09 PM | #66 |
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Does going to a 335/128 rear caliper/rotor on a 135/128 require the narrow hub mod or does it swap straight over?
Answer to anyone in the future: Yes, you need the hub mod to use 335 calipers and rotors. Or find rotors that line up and have the right OD, I chose to do the hubs to keep the brake set up simple, and expand wheel choices. Last edited by amg6975; 05-03-2018 at 06:39 PM.. |
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