First off there are larger replacment calipers for the mini which allow you to use your emergency brakes. That being said may I ask how you arrived at the statment above with regards to larger diameter rotors with stock calipers not making a differance?

Randy
M7 Tuning

 

I read this very informative article recently on the type of testing StopTech does to each and every BBK they sell. Give it a read

 

In reading some of the fora concerning Autox and track suspension setups, I've noticed a couple of posts about uprated rear calipers.

Those who are addressing this issue are saying that you will get snap oversteer (very very bad) if you engage uprated rear calipers in a turn. The weight distribution in these cars is such that the rears are truly along for the ride. Plus, when you apply the brakes, you are transferring the weight of the car to the front. The front end dives, the rear end rises. Even with lowering springs and all sorts of mods, you're still shifting the weight to the front. Put the stopping power where the weight is, and you'll stop quickly.

Try pulling the parking brake on ice while doing a very gradual turn at low speeds(trust me, it's fun). You'll quickly learn what snap oversteer is and why it would be very bad on a track or in traffic.

 

My little 'pie' calculation for two pistons exceeds the area for a single 53mm piston. By a sizeable amount. But actually I am not sure of the formula to compare the clamping power. Probably has to include caliper rigidity, CoFs, and the increase in rotational mass. If they didn't have the ability to stop you sooner (ignoring heat induced brake fade which is probably much reduced), then what would be the point. Color notwithstanding. But clearly they do.

Larger disks with the stock calipers on the rear would weigh more and cost more. Pads could be used to fine tune things, a stickier pad on the back might increase braking and the heat gain on the rear might not matter much.


I have seen them on the shelf, but cough at the cost. I am somewhat jealous. Enjoy. Given a choice between 20% more power and 20% more braking power, I would take the brakes.

 

Really? There are kits for many cars that use adapters to push stock calipers farther out (radially) to make the braking CIRCUMFERENCE larger (more pad/rotor contact per rotation of the wheel). While the instantaneous contact area is identical compared to stock rotors, you cover more of that area in the same time with larger circumference. Remember, the difference in area between concentric circles is exponential [A=1/2(pi)(r1-r2)^2]. This is also helpful in heat dissipation.

Marty

 

Here are my observations after having them on the MCS for 5 days now:

1. The pedal feels more "connected" to the braking system over stock. It's more "communicative" and requires a little bit more pressure than stock to stop hard.
2. I have stopped so hard as to engage ABS and everything feels normal in this regard.
3. Hard stops after the system has warmed up are absolutely incredible. The adage "pop your eyeballs out" really does apply here
4. The “bed in” process proved difficult because building up the necessary heat in the system was difficult to do. The first cycle really made the most difference after a layer of pad material bonded to the rotor.
5. Fade resistance is noticeably greater than the stock system. I ran it hard the other day on a quiet stretch of road with no noticeable fading.
6. It stops "true" as in a straight line with no hands on the wheel.
7. The Axxis Ultimate pads dust less than OE pads

I’ll post more observations as time goes on and I get a track day or two under its belt.

 

Red Baron,
Don't forget to change your pads for the track. The Axis pad are only for the street.
Emmanuel

 

No worries. I'm researching appropriate pads. The Axxis Ultimate rears can stay in on the track (according to StopTech and some other brake gurus). Front swap is super easy now

 

Amen, they are really bad on the track. I used Hawk Blues on the front and Ferodo 2500's on the rear with my Stoptech BBK.

 

RedBaron,

Looking super sweet. After seeing them in person, I can honestly say that the pictures don't do them justice. This is the kit I will be getting when the time comes (read: when I am not broke from existing mods).

Great job on the install and awesome results! Have fun with them

 

Any one know the weight of the kit? Is it heavier than stock?

RedBaronF2001, do you notice any trade off in acceleration?

THANKS

 

I emailed Todd about some wilwood kits and fitments and he wrote back to look at his wheel fitament faq. I did and I measured it but I am wondering if I did that right. I put the ruler about the center of the hub and then measure six inches along one of the spokes. The I measured from there vertically and found I had 1 1/2 inches of clearance(approx..I will need to remeasure again).

Did I do the measurement correctly?

 

Quote:

Originally Posted by maxmini

First off there are larger replacment calipers for the mini which allow you to use your emergency brakes.

Hey Randy,
Please let me know what rear calipers are available with E brake, I'd be interested!

Quote:

That being said may I ask how you arrived at the statement above with regards to larger diameter rotors with stock calipers not making a difference?

You are right to question my statement and you may be correct in thinking it to be incorrect as it most likely is. I do run larger dia rotors in the rear and I just can't say one way or the other if there is a difference.

 

Significantly. RBf2001 is putting ~190HP on the ground, though. I doubt the weight addition was perceptible on the butt-dyno.

 

Do you think it might feel like putting on a heavier wheels and tires?

 

I'll avoid any comments on ST brake kits as they build a fine product.

However, I'll say that I know of no aftermarket rear calipers with parking brake that will work on the MINI.

I too would like to know the specifics of what someone may have found.