General > Product Reviews
VW Racing Big Brake kit product review
chungster:
--- Quote from: Janner_Sy on February 19, 2012, 07:37:06 pm ---Christ, i managed to get the DS2500s to fade with 312mm discs on my octavia when at Oschersleben Motorsport Arena.
That said, the discs are only small so wont dissipate the heat as well. Guess the Octavia is a heavy beast as well
--- End quote ---
As DaveB said earlier the DS2500 is a good Fast Road / light track use pad. I have them in my AP 4 pots. Done a few track days on them and theyve been fine but then again I know my own limits when out on track. The R is my road car at the end of the day.
tony_danza:
Non floating 2-piece discs are an odd choice, 2 metals expanding/contracting at different rates will only either stress the bolts or the weaker of the two materials. Mine used to grow by 7-8mm in diameter (tell tales on the bells).
DaveB@Vagbremtechnic:
Regarding floating or bolted, floating rotors are nice good to have invariably you'll always be bouncing off a temperature ceiling with bolted rotors. It needs to be explained that there is NO benefit in using these rotors if you want to have the benefit of expansion as heat increases, the rotor has NOWHERE to go. Using these rotors is a weight saving measure there is no other benefit if the disc is warped the disc can knock the pistons back into the caliper making the pedal seem unresponsive
For high end setups, track cars ( and I mean ALMS cars, Formula 1 cars upto about 5 years ago) you need axial and radial float! Radial is the expansion of the disc from say 360mm to say 365mm as it gets hot, axial float is the ability of the disc to acquire its own centre in the caliper, this needs to be controlled up to a max of about .7 of a mm ideally 0.2mm,
To mount the disc in a way that not only ALLOWS this float but also controls it is expensive but gives MASSIVE headroom and improves wear.
Whether you need bolted or floating is a function of corner entry speed and whether or not you want to put 5-6 laps back to back or 15-25 without worrying about brakes.
THe TTRS is a real disc eater especially in stage 2 guise we've had huge success on that car with these, they've done track days, rally's, shoot outs with Jonny C driving !
This is my TTRS replacement disc this is the hardware and bell design required for high end heat management, it's also OEM quiet and you can do 20 laps at Oulton drive home and then drive to work the following day without ever NOTICING your brakes. We designed and had manufactured the bobbin springs ourselves (Epic project, believe it or not Rochdale is the spring manufacturing centre of the cosmos....long story)
I've got this disc in Gallardo/ R8 front and rear/ C5 RS6, RS5, TTRS & Mk5 version with and without the built in spacer all fantastically technically successful.
the only person using this arrangement on here is Geordie56 on his rocco, I was desperate for you to have a go in it Steve as I think you would be converted, and imvho it's the pinnacle non hyped setup for the Mk5 platform.
if he ever packs in blowing it up, I hope you'll get a go in it
So what's my point?
It's the same price as the VWR kit.......
Janner_Sy:
--- Quote from: Janner_Sy on February 19, 2012, 07:29:26 pm ---
--- Quote from: DaveB1970 on February 19, 2012, 07:18:06 pm ---The rotors have ZERO float, they are simply bolted, the calipers are two piece so prone to flex, and all this hype about piston sizes is a load of crap , the surface area will work our at around 49-52 sq cm, they might tune the caliper with a smaller small piston for better bite but what's the point when they turn it upside down?
If they're having to turn it upside down to get it to work the piston sizes are WRONG.
--- End quote ---
Why would reversing the calipers provide no stopping power? Surely outright stopping power would be similar if not identical, but with the small piston deploying first you would maybe have a more progressive setup that doesn't eat pads?
Ref the fixed/bolted rotors vs floating, whats the real world difference between them bearing in mind im not a racing driver. Also do they not use the same bolted discs for the race cars?
--- End quote ---
Thoughts Dave?
jimk04:
Surprised to see these pukka brake kits having such bad pad wear,..rate and uniformity. Tho if they aren't oriented correctly piston wise.....but how do vmr sanction a kit with the calipers seemingly the wrong way round?! :popcornsoda:
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