Brake mods (for track)

[Boundless]

Hi mates!
Now I'am running Z4 3.0si with combo of ATE Powerstop discs + ATE Ceramic pads. It's good but nothing special. And while I'am gonna put a V10 in my Z4, I need to start thinking about some serious brake power. What swaps or kits can you recommend for track use ? (The only restriction - they should fit R18 wheels fron and R17 at rear)

[Punisher3.0si]

I'd love to hear more about this V 10 project!

[3002 tii]

Stoptech ST40 kit

[Vanne]

Your gonna run 18 inch at the front and 17 at the rear?

[Boundless]

Originally Posted by Vanne

Your gonna run 18 inch at the front and 17 at the rear?

I'am running Volk TE37 R18 all around. But for some tyre-burn fun I put R17 wheels at the rear

[Boundless]

Originally Posted by 3002 tii

Stoptech ST40 kit

Thanks for advice!

What size should I choose:
355x35 to the front and 332x32 to the rear ?
Or 328x35 is better than 332x32 ?

[3002 tii]

There is no rear kit. Are you sure it's for the 3.0si?

[Boundless]

Originally Posted by 3002 tii

There is no rear kit. Are you sure it's for the 3.0si?

I'am not. I thought you talked about full kit, but now I understand that it's only about front.

[The HACK]

A set of brakes designed to stop a 3,000 lbs car making 260hp is going to stop a 3,000 lbs car making 4,000HP. It is IRRELEVANT what engine you plan on stuffing into the engine compartment. The only thing you should concern yourself with, is how much heavier the car will be with the V10.

And since the brakes on the Z4 are direct carry overs from E46 sedans and coupes that weight over 200lbs more, it's a safe bet that your current brake setup sans the sh*tty ceramic pads will do just fine stopping your car despite the V10.

Brakes are designed to dissipate kinetic energy as heat. Kinetic energy is basically velocity squared times mass divided by 2. Notice the formula didn't say anything about power or work? Because regardless of how much power your engine pushes, every time you step on the brake it is the SPEED at which you step on the brake which determines how much energy the brake needs to convert into heat to slow or stop you from said speed.

What you're looking for, is a simple "line-lock" kit. You don't need upgraded brakes to slow down or stop the car. You need a simple kit to lock the front brakes and release the front brakes on command while you're stationary. Heck, for the amount of bias in weight you'll shift up front, plus the power being put to the wheels, you probably don't even need a line-lock kit to do burn-outs. You're probably shifting over 15% of the weight forward, and on a sprung system it means no amount of "brakes" on the rear is going to keep the rear wheel from spinning. Brakes, IMO, is the least of your worries.

Really, the question to ask here is, which big brake kit looks best under your wheels. And for that, the answer is it doesn't really matter...But buy the one that looks the best that fits within your budget, and judging from the attempt to shove a V10 into a Z3 3.0Si, probably whatever gaudy, 360mm+ kit with more than 8 pistons on a 2 piece molded block will do.

[3002 tii]

^^ Gaudy kit lol

[GuidoK]

Originally Posted by The HACK

Brakes are designed to dissipate kinetic energy as heat. Kinetic energy is basically velocity squared times mass divided by 2. Notice the formula didn't say anything about power or work? Because regardless of how much power your engine pushes, every time you step on the brake it is the SPEED at which you step on the brake which determines how much energy the brake needs to convert into heat to slow or stop you from said speed.

You dont think by virtually doubling the power he'll make more speed on the straight of a track? Thus having to brake harder/dissipate more heat for the next corner than he does now (also with some added weight from the v10)
He says it's for track use, so I suspect he's flooring it.

As for availability, I know D2 makes different sets both front and rear for the z4 where you can choose rotor size, floating/non floating, with or without dustseals etc. And with keeping the parking brake function (I dont know if that is something you have to maintain?).
The calipers they use, have fairly generic pad sizes, so you can choose from most pad manufacturers.
The uk site of D2 has some more info than the global site I think: http://d2brakes.co.uk/