i_love_cars said:
I agree that BMW should offer better caliper design, to an extent. For new drivers who aren't gonna go that fast or push that hard, the car will be safe on track. For someone like me, it'll cook the brakes in 2-3 laps though. If you want to roll an M3 off the showroom floor and take it to the track, then it doesn't matter what kind of caliper they give you - street pads are going to fall apart and overheat quickly at the track. There's no getting around it. So yes, a good race pad and fluid is honestly all you need in the e92 to do well at the track with braking (the e46 was the real weak link). Which is why I said buying this BBK is kindof overkill, but at the price I just couldn't say no.
Bottom line is, you're gonna need a good race pad no matter what if you want to go through a day of braking at the track without issues.
Also, "Brembos" don't really mean much. The 135i comes with 6-pot brembos in front and they come with sacrifices like shitty piston material that has literally been known to start on fire and melt during hard braking at the track. You need to drop another $400 to upgrade the pistons. They also didn't do that great at the track. Hell even my Acura TL-S came with 4-pot brembos in front standard and they were just not that great. You are still getting generic, mass-produced parts that are only slightly better than what a regular caliper would be.
Also, remember that piston counts don't mean anything. These PFCs I bought have 4 pot and they will stop better than any 6-piston caliper you can buy for this car. There is math and science behind why that is.
For sure I've now got more braking than my tires can make use of. In order to fully extract what this bbk is capable of, I need to run r-comps at the track, which will be next year. I jumped right into the E30 with slicks and it was very easy to manage because of how light the car was. I am going to run the M3 on street tires for a few events to learn the car a bit - r-comps just carry so much more speed through corners and with how heavy this car is, I want to get a feel for the weight transfer.
Nailed it. Even though the 135i has 6 pot calipers, they're a big downgrade from the single piston 335i brakes in stopping power. I think a common misconception is more pistons are always better.
Daggerty said:
The car should've came from the factory with fixed calipers.
A pure performance car that is going to be tracked shouldn't come with single piston fixed calipers just because they have a good stopping distance after one run.
Im sure with the right pads and brake fluid they would do alright but seriously if your selling a car for 90k put some decent calipers on. If Ford can put fixed brembos on a 40k focus, I think Bmw can sacrifice a little money for the upgrade.
Any street car sucks on track without track pads and fluid (excluding hyper cars, etc.). The F80 4 piston brakes are terrible on track as well. Also, the E9x M3 started at ≈$58k IIRC, not $90k.