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08-03-2020, 01:43 PM | #46 |
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I finally had a chance to perform this task. I kept asking friend to borrow a solder iron but finally someone has it. It work perfectly. After i did my brake upgrade, i had to align it but since i was off a little and i didn't have the tool to check whether is balance or not. During down shift the car feel jerky. Now with this, downshift smooth. Thanks again.
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09-08-2020, 09:28 PM | #47 |
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Quick question for those who did the swap, with the F8X retrofit, do you still need to remove/cut the dust shield like other BBKs? I don't think anyone mentioned it here, so I assume you don't need to touch the dust shields?
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09-09-2020, 07:54 AM | #48 | ||
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09-10-2020, 03:54 PM | #49 |
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For some reason I didn't see that part...my bad
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09-17-2020, 03:14 AM | #50 |
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About to carry this mod in coming week. In regards to the ABS wheel sensors, splicing the cable. I assume there's no polarity to follow any which way soldered/heatshrink works?
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09-27-2020, 02:20 AM | #51 |
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I found this thread with interest, as I have been doing lots of research into doing a properly matched BBK retrofit, with calipers that have as close to stock piston area and front/rear bias as possible.
My first consideration was of course this F8X setup as it would seem a no brainer, however despite the relatively simple fitment, I've realised that the M4 has a 10% smaller total piston area than the E92 M3, which means a 10% firmer pedal with 10% less modulation, and 10% less torque at the piston. Here are the caliper stats side by side: E92 M3 calipers Stock M3 piston area front 60mm - 2826 x 2 Stock M3 piston area rear 46mm - 1661 x 2 Stock M3 total area 4487 Stock front bias 63% M4 calipers F8X M3/M4 front BB-43 (40/40x30mm) - 2512 x 2 F8X M3/M4 rear BB-22 (44x24mm) - 1520 x 2 Total 4032 - 10% firmer - Stock bias 62% Ideally you want to find calipers that maintain the total piston area to match the capacity of the master cylinder. If you compare the E92 specs with even the Stoptech setup, we can see that even they deliberately only differ total piston area by 1% and shift the bias slightly rearward: Stoptech BBK Stoptech non Trophy st60 front = 36/36/30 - 2741 x2 Stoptech Trophy ST60 32/34/36mm = 2729 x 2 Stoptech st40 355 back = 34mm 32mm - 1711 x 2 Total 4452 or 4440 x2 / 1% harder 61.5 front bias To keep as close to stock piston area, ideally you need to find a combination of front and rear calipers with the following piston configurations: Front 6 Pot 32/34/38mm - 2845 x 2 30/34/38mm - 2748 x 2 30/36/36mm - 2741 x 2 32/34/36mm - 2729 x 2 Rear 4 Pot 34/32mm - 1711 x 2 30/34mm - 1614 x 2 32/32mm - 1608 x 2 Definitely not poo-pooing this setup, especially as I haven't tried it, but wanted to be transparent with my findings so that ppl can make an informed decision. Mart. Last edited by Captain Caveman; 09-27-2020 at 02:27 AM.. |
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09-28-2020, 08:04 AM | #52 | ||
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Shouldn't that have an effect on torque applied, since it is from both sides? It certainly doesn't feel like less torque is being applied to braking. Either way I am very happy with the upgrade especially at the prices I paid, as the prices on these parts have taken a jump recently, probably due to increased demand.
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Last edited by tdott; 09-28-2020 at 08:15 AM.. |
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12-28-2020, 10:01 PM | #54 | |
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Big fan of black calipers on the E9X as it's aligned with the GTS and is generation correct. Are these winter projects or you want on road testing these soon 😃 |
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12-28-2020, 10:44 PM | #55 | ||
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Drives: 2011 Frozen Grey E90 M3
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No road testing till the spring 😠
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12-28-2020, 11:14 PM | #56 | |||
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Did you opt for new spindles or did you have a custom bracket made? Curious to hear total conversion costs. |
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12-29-2020, 08:31 AM | #57 | ||||
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Spindles, hardware and F80 ABS sensors... As for the cost, I'm sure I could tally that up. There's a complete setup including spindles on Ebay right now for $1800 USD.
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03-29-2021, 01:35 PM | #58 |
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Has anyone tried this with f30 calipers and 370f/345r rotors?
I know the rear should bolt on easily just not sure about the front. Would I need f30 spindles instead? |
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03-29-2021, 03:52 PM | #59 |
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The calipers are the same, you need f8x spindles and f8x rotors to use them.
No idea what f30 spindles does to the geometry, the offset of the 370mm rotors are different, not sure if they would work. Can't help there. Not even sure if it would even be worth it to try.
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03-29-2021, 05:09 PM | #60 | |
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03-29-2021, 06:01 PM | #61 | |
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No idea if a f30 rear rotor will even work with the parking brake. |
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04-21-2021, 11:10 PM | #63 |
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Fronts are the same. Direct fitment. The rears don't.
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04-22-2021, 08:08 AM | #64 | |
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I went ahead and installed f8x dust shields on both sides so im not 100% sure.
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04-22-2021, 12:19 PM | #65 |
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04-22-2021, 12:20 PM | #66 | |
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