My pad of choice on the evo is the XP8 from Carbotech. Speak to Ian, he's very knowledable & can supply any pads & compounds to suit your needs.
http://www.carbotech-europe.com/
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Ap Discs and pads?
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Ap Discs and pads?
I don't understand how higher friction pads gives the discs an easier life. From my high school physics, surely you are just converting the kinetic energy of the car to heat energy in the disc. The AVERAGE of the two must match, whichever way you do it to arrive at the same corner speed.
If you use a higher friction pad (which presumably reduces the DURATION of the braking), surely this results in a HIGHER peak temperature but for less time. The thermal shock on the disc is INCREASED! You also get closer to the traction limit of the tyres. Seems a little disingenuous to me, although I'm no expert by any means.
If you use a higher friction pad (which presumably reduces the DURATION of the braking), surely this results in a HIGHER peak temperature but for less time. The thermal shock on the disc is INCREASED! You also get closer to the traction limit of the tyres. Seems a little disingenuous to me, although I'm no expert by any means.
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Ap Discs and pads?
Yeah, I see what you mean. Thing is the friction coefficient is pretty high (0.49) already, I'm also weary of putting anything with even more bite will be like head butting the steering wheel on even the lightest application with these calipers.Lower wrote: ↑Wed Feb 14, 2018 2:00 pm You're looking at it from slightly the wrong angle.
If you go for a higher friction pad (coefficient of friction at 0.4 or higher) you get more initial bite for a lower pedal pressure and the disc/pad temperatures reduce as a consequence. You also don't necessarily want a pad that keeps working at massively high temperatures on a car you're using to track days because you have no way of knowing that you're overheating the discs. A little bit of fade at high temps can actually be a good indicator that you should allow the brakes to cool a bit.
I had success with Dixcel pads in the S2000 (R01 on the front and Z on the back), but i don't know if you can get them for the Z4M and different makes/compounds do seem to perform differently in different types of car so i can't really help with specific advice. It is quite hard finding the proper coefficient of friction figures for some pads so i ended up trying loads and cracked a number of discs along the way. Ferodo DS2500, Spoon, Porterfield R4S, RS9, etc etc. but the dixcel pad on a DBA4000 disc worked the best where the discs survived with excellent braking performance that didn't tail off. Worked well enough from cold too.
The discs should also be able to cope with those temps I was seeing.
I'll see how I get on with some more cooling and perhaps switch to RSL-1 next time round (pagid seem to have a new lineup of pads these days http://www.pagidracing.com/en/products/racing-brake-pads/product-family-rsl.html), I'm hopeful the PF discs will be better in any case.
Cheers
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Ap Discs and pads?
Cheers, yes I've heard good things about that brand.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- exdos
- Senior Member
- Posts: 2789
- Joined: Wed Feb 22, 2012 12:58 am
Ap Discs and pads?
In devising my brake cooling method, I had read that proper brake cooling has the equivalent effect as using a larger disc which is 1" greater in diameter. That's the way to go.
- RedUn
- Senior Member
- Posts: 1108
- Joined: Sat Jun 16, 2012 7:33 pm
- Location: Hertfordshire
Ap Discs and pads?
Couldn't agree more, they are the way to go and would be my recommendation too
IMOLA Z4///MR
- RedUn
- Senior Member
- Posts: 1108
- Joined: Sat Jun 16, 2012 7:33 pm
- Location: Hertfordshire
Ap Discs and pads?
Air flow is the answer for sure!
Custom backing plates would be ideal with some nice ducting
Be prepared for rust down the sides of your car paint work though after heavy use
IMOLA Z4///MR