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      03-31-2012, 11:21 PM   #1
Zzhou
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Question 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, 12:04 AM   #3
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      04-01-2012, 12:18 AM   #4
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Quote:
Originally Posted by rldzhao
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
Not the GT4 brake,i dont know if it's the same or not.I will use it on both street and track. I currently live here, studying in college. Will move to other place after graduate. My home is Shanghai!! HAHA
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      04-01-2012, 12:23 AM   #5
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Quote:
Originally Posted by rldzhao
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
I also heard somewhere that AP 378mm need more space than ST-6 380 and brembo 380. I really like the look of AP, but don't want 368mm. How's ur ST? My list is 378mm AP, and #2 is ST.
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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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Quote:
Originally Posted by rldzhao
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
this is from AP website.
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 Ø378 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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Quote:
Originally Posted by zhouzitao View Post
this is from AP website.
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 Ø378 x 36mm / 72V
- Kit = CP6895-001M.G8

Waitting for you brembo review~ and when you going to try AP haha
Is this from AP Racing's website or Brake Pros (AP Racing US importer)? On Brake Pros website the e9x M3 front rotor is 368 mm (14.5"), not 378 mm. Also, why do you think a 368 mm rotor is not adequate for your car?
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      04-01-2012, 11:25 AM   #9
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Quote:
Originally Posted by dbarnes View Post
Is this from AP Racing's website or Brake Pros (AP Racing US importer)? On Brake Pros website the e9x M3 front rotor is 368 mm (14.5"), not 378 mm. Also, why do you think a 368 mm rotor is not adequate for your car?
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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Quote:
Originally Posted by HP Man View Post
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.
I could be wrong but I thought Brake Pros was the only authorized US importer of AP Racing "street" BBKs?

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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Quote:
Originally Posted by dbarnes
Quote:
Originally Posted by zhouzitao View Post
this is from AP website.
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 Ø378 x 36mm / 72V
- Kit = CP6895-001M.G8

Waitting for you brembo review~ and when you going to try AP haha
Is this from AP Racing's website or Brake Pros (AP Racing US importer)? On Brake Pros website the e9x M3 front rotor is 368 mm (14.5"), not 378 mm. Also, why do you think a 368 mm rotor is not adequate for your car?
AP site, if I can go for 378, why not?
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      04-01-2012, 06:27 PM   #12
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Quote:
Originally Posted by zhouzitao View Post
AP site, if I can go for 378, why not?
I was wondering why you felt 368 wasn't adequate for the e9x m3 - more of a technical question. Sorry if it didn't come across that way.

Have you checked with vendors to see if they can get the 378 mm BBK in the US?
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      04-01-2012, 08:02 PM   #13
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Quote:
Originally Posted by dbarnes View Post
I was wondering why you felt 368 wasn't adequate for the e9x m3 - more of a technical question. Sorry if it didn't come across that way.

Have you checked with vendors to see if they can get the 378 mm BBK in the US?
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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Quote:
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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.
+1.

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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Quote:
Originally Posted by STALKER
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.
I'm running on OEM ZCP right now, and will switch to some 18 track wheels most likely volk G25.
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      04-02-2012, 12:17 PM   #21
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Quote:
Originally Posted by dbarnes
^+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
Do you know how many vanes on stoptech 380 rotor? I love APs design while Stoptech is lot cheaper. I saw so many corvette on the track day has stoptech kit. And those cars have more than 600whp..
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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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