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03-31-2012, 11:21 PM | #1 |
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What 18 wheel can clear AP 378mm BBK
Like the topic said. I really want to know What 18 wheel can clear AP 378mm BBK. As I think 368mm for the front is not big enough. I saw BMW GT4 is on AP 378mm kit with BBS wheels.
Front brake system: AP 6-piston racing braking system, 378 mm diameter
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03-31-2012, 11:57 PM | #2 |
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Are you getting the GT4 brakes? Is this for a street car or a race car? I ask because racing calipers typically do not come with dust boots nor paint to protect the caliper against corrosion. And you live in Indiana? (snow, salt?)
In terms of wheels that fit... see here http://www.m3post.com/forums/showthread.php?t=359764 |
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04-01-2012, 12:18 AM | #4 | |
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04-01-2012, 12:23 AM | #5 | |
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04-01-2012, 01:13 AM | #6 |
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Do you have the kit number and specs?
My StopTech has been working great. Best part is the ease of changing pads and cost of replacement parts. Though I have Brembo now... http://www.m3post.com/forums/showpos...3&postcount=62 |
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04-01-2012, 04:52 AM | #7 | |
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Model Year 2008 on Brake caliper Type - RH = CP5555-830S0BG - LH = CP5555-831S0BG Brake Disc - Drilled N/A Brake Discs - Grooved Yes Brake Discs - Plain N/A Brake Discs - Strap Drive Ă˜378 x 36mm / 72V - Kit = CP6895-001M.G8 Waitting for you brembo review~ and when you going to try AP haha
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04-01-2012, 08:30 AM | #8 | |
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04-01-2012, 11:25 AM | #9 |
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AP makes both a 368mm and 378mm kit. The 368mm kit is most commonly used as it can be used with OEM 18" rims and a variety of other 18" rims. I have the 368mm kit and would not want the 378mm kit due to the limitations it imposes on wheels. That being said, lots of people run the 380mm ST or Brembo kits and are happy with them (notwithstanding the greater difficulty with wheel clearance). However, I doubt that the 378mm kit will have significantly better thermal capacity than the 368mm kit.
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04-01-2012, 02:22 PM | #10 | |
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Nevertheless, I agree that the 368 mm rotor is sufficient in terms of thermal capacity for the e9x M3. I'm running the PFC BBK with a 372 mm rotor and I've never encountered any type of brake issue. If PFC offered a larger rotor I would still use the 372 mm rotor. |
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04-01-2012, 06:01 PM | #11 | ||
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04-01-2012, 06:27 PM | #12 |
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04-01-2012, 08:02 PM | #13 |
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Um, Not saying that 368 is not good, maybe it is good enough for my skills at the track. But jump from stock 360 to 368 and cost that much $$, I would rather spend a litter more and get a 378 kit. I haven't check with vendors yet. Did some search, it can get in US just need to wait a little more. Also I'm not ready to add BBK at this point, I just went to my first track day in my life in my M3 today. I wasn't push it hard, but I still passed whole lot of people in my Novice group. I used stock brake pad, and it only started to loosing brake power on the third section
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04-01-2012, 11:10 PM | #14 |
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Keep in mind that rotors are not all just about size, or the outer diameter in this situation
You also need to consider the number of vanes, width of the ring, total thermal mass, just to name a few. For example, my Brembo 365 mm rotor is actually heavier than the StopTech 380 mm rotor by 4 pounds. The stock rotors, although similar in weight compared to the BBK rotors, have only 30 vanes each, vs. 48 for StopTech 355 mm rotor. This is a main reason, at least in my opinion, why the stock rotors don't cool as well as the BBK rotors. Hence, even at the same size (diameter), two rotors can perform drastically different depending on how the vanes are designed. So don't be blinded by size alone. FYI the European AP kits (which is what you've been looking I think) are slightly different than USA AP kits. That's why very few have heard about 378 mm AP front kit here. |
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04-02-2012, 04:44 AM | #15 |
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^+1
Also, the vanes on the OEM rotors are partially blocked by the floating pins which are centered on the rotor and supported by cast flanges on the Aluminum mounting hat. This reduces the overall effectiveness of the pumping ability of the OEM vanes. Here's a post showing the OEM vs. AP vane design/clearance: http://www.m3post.com/forums/showpos...91&postcount=1 As for thermal mass, the OEM front rotor is 360x30 mm whereas the AP front rotor is 368x36 mm - significantly more thermal mass along with more vanes on the AP rotor (72 curved vanes). OP - glad to hear you had a great time during your first track day This is when things start to get really expensive |
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04-02-2012, 10:32 AM | #16 |
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I have the standard AP kit. It's more then what you need. Your are waisting your time and money going with the larger kit.
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04-02-2012, 10:48 AM | #17 | |
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Running standard AP 7100/7150 kit here, more than adequate for HPDE. These were intended to run under stock 18" wheels.
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04-02-2012, 10:49 AM | #18 |
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Just to answer the original question, you should also take a look at the Advan TCIII 18" wheel. I've got 384mm rotors upfront, and the TCIII has more clearance than my TE37SL.
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04-02-2012, 11:49 AM | #19 |
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They wont fit under stock 18s without a spacer. They were suppose to fit under EU 18s, but they are the same as NA 18s now, so the fronts require a spacer.
I know because I ordered and test fitted both versions.
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04-02-2012, 12:13 PM | #20 | |
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04-02-2012, 12:17 PM | #21 | |
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04-02-2012, 12:57 PM | #22 |
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As a few others mentioned. The 368 AP kit is more than you need. I have run this kit for the past few years like others with no issues on the track and it gives you a lot of options for track set ups
The Stoptech kit is also more than you need. If it works for Leh Keen - it will definitely work for you too. |
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