BBK Datapoint

[james 408]

Couldn't find the BBK thread I wanted, so just making a new one to share the data:



this is a 14" brembo rotor, used primarily on canyon runs.

Just a datapoint for you, lotta opinion out there that this might help sway. Stock rotors with pads are good, but can be overheated. The 17" wheel and 13" rotor mark is better, but can be overheated. The 18" wheel and 14" rotor mark is better still, but there's the weight argument, even still, it can be overheated.

I've warped and cracked dozens of rotors now, and as far as i'm concerned, there's no such thing as overkill as long as you're really trying to kill it.

Please note this datapoint is best applied to heavy track use or similar -- it has nothing to do with you having 500hp and roll-racing or autocross or beginner track days.

[Monty23]

How does the car behave when the rotor is cracked like that? Lots of vibration in the steering wheel? Braking power reduced? Unnoticeable without a visual inspection?

[Bordom]

Solid or 2-piece rotor?

Everything graciously mispelled by Android

[Nichtknicken]

It would be further helpful to share pad compound and brake ducting setup, if any. Oh, and, stock weight car?

[getslideways]

It would be FURTHER helpful to post videos of you doing the canyon runs... you know... to... uh... analyze for....ummm... data?.... (ok I just want to see some hard running B5 canyon footage!)

[james 408]

How does the car behave when the rotor is cracked like that? Lots of vibration in the steering wheel? Braking power reduced? Unnoticeable without a visual inspection?

yeah just feels like a shimmy like brake pad deposits, maybe a bit sharper in feel (like a slotted rotor)

[james 408]

It would be further helpful to share pad compound and brake ducting setup, if any. Oh, and, stock weight car?

no real ducting on this one, buddy's got ducting same results. It's the extended downhill descents. Both cars are a few hundred lbs lighter than stock. Using full track pads, carbo xp 20s on this set

[kingkhalilz]

Ahh looks good throw it back on

[james 408]

It would be FURTHER helpful to post videos of you doing the canyon runs... you know... to... uh... analyze for....ummm... data?.... (ok I just want to see some hard running B5 canyon footage!)

i know i know. I need to buy a camera of my own, usually just get to see it on their camera before it disappears for good. There was a drift day that had some pretty amazing footage of tandem slides with a 240sx and the audi drifting at almost double the corner exit speed with zero-countersteer -- that's what I was gonna link a while back but I just couldn't pry the footage out from the guy.

[XLR8 Craig]

Wow! that looks like it was very fun though.

Maybe a StopTech big brake kit is in your furture we are offering about 25% off of msrp right now just so everyone knows!

Thanks,

Alex

[james 408]

Solid or 2-piece rotor?

Everything graciously mispelled by Android

2 piece floater -- stasis/alcon kit. This is pretty rare on this kit, this being the worst -- but surface cracks and the like occur regularly on my car and a buddies (he's on some 14.5" discs). Most of my rotor failures were pre-BBK.

[kingkhalilz]

Would a BBK kit be worth it if your just road racing? I am getting the worst shudders and curious how much of a difference these kits are?

[james 408]

definately if you're fast or experienced. Like advanced group in an established track club. Below that usually just track pads will suffice for a 20 minute session on most tracks. It does depend on the track though. it's the triple digit brakezones or downhill brakezones that just murder the brakes.

but if you hit those canyons that are by you in utah, 10 minutes on a downhill, because the brakes never really get to cool, you can cook your brakes in as little as 5 minutes on stock rotors. (be super careful on those canyons though, people, turnouts, and cliffs all over the place, but decent shoulder on some of them and definately some stretches without driveways)

[kingkhalilz]

I used to live in UT had to update that. Interesting, I never had any trouble with them back in the canyons and we hit that hard. But that crack is a good one.

[james 408]

yeah at a reasonable pace there's plenty of cooling. F= MV^2 that velocity one's the killer =P (might not quite be the right equation for the problem but close enough). I didn't have problems when I went to school there for a year, but half was snowy and the other half I was learning. Canyon has to be completely vacant to really go at it.

Just to give you an idea, the scene in c... Mexico is way different than it was in Utah when I was there:


that onboard you get in the middle is a pretty sweet mid-size turbo FDrx7, might be a 3 rotor the guy has a bunch of em.

[Cysco abt S4]

my rotors need ducts or they crack after some good runs , switched to porterfield street / race pads from ceramics and still cracked

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