Nifty Posted March 9, 2006 Posted March 9, 2006 I have sitting in my garage a pair of HiSpec 4 pot Ultra Lite calipers that have been waiting for 12 months to go on. Since I'm about to increase the hp to the 200 mark they will definitely be going on but I think I should uprate the discs too. However, what should I put on - vented, cross drilled or grooved 🤔 What are the inherent advantages/disadvantages of each type 🤔 *confused* Keep off the straight and narrow 😬 Edited by - Nifty on 9 Mar 2006 22:25:35
Nifty Posted March 9, 2006 Author Posted March 9, 2006 Also forgot to ask ...who to buy from. Might well see what HiSpec say because I rather fancy getting a pair of rear handbrake calipers too ... if they will have any ready by 2007 ❗ 😳 Keep off the straight and narrow 😬
nickh7 Posted March 9, 2006 Posted March 9, 2006 Nifty I spoke with Perfermance Braking and they not that keen on drilled prone to cracking phone thm on 1600713117 to discus option, me I went solid brembos Nick h Its Yellow and Black and makes me 😬
Billyboy Posted March 9, 2006 Posted March 9, 2006 Go with traditional vented - cross drilled and grooved do not offer much in additional braking....if anything they eat brake pads far quicker! and has been said are very prone to surface cracking!
caterhamnut Posted March 9, 2006 Posted March 9, 2006 Nifty - the only discs I have ever seen crack have been vented (Marks and Alex wongs - same failure - see pics on our website) Now that doesn't prove a thing, but when it costs £120 (roughly) to replace a big vented Caterham disc, compared to about £12 to replace a solid one if that ever failed, I know which I would prefer. We have James Whiting Alcon brakes (almost the same as AP) but with nice cheap, effective, reliable, easy to replace solids..... www.mycaterham.com here 91,000 miles -1st 1.6k Supersport, '95 Motor Show car
Nifty Posted March 10, 2006 Author Posted March 10, 2006 Replacement cost isn't the issue so much as stopping power, although one obviously doesn't want a failure ❗ Vented, grooved or cross drilled all have their technical advantages over solids when it comes to braking power but which is best 🤔 Keep off the straight and narrow 😬
oilyhands Posted March 10, 2006 Posted March 10, 2006 Vented disks will cool better at the cost of a marginal loss in pedal feel. Grooving and drilling helps to deglaze the pads and allows gases to escape when conditions are arduous and temperatures very high , this delays the inset of fade a little by preventing the pad from floating on the gases. Drilling reduces weight but increases the tendency for cracking, grooving is ideal since it performs a similar function to drilling but without the tendency to form cracks. If it were me I would fit vented grooved disks. Oily
Griff Posted March 10, 2006 Posted March 10, 2006 On advice from Performance Braking I've stuck with standard solid disks which I've now renewed as they were so cheap and couldn't be fagged to buff up the old ones for a change of pads. Never had problems with standard disks before. I've also upgraded to DS3000 pads (few other good choices for my WIlwood calipers). This winter's other upgrades included a racing master cylinder for a harder "feel". Car is just over 200hp and stopped pretty well on the old setup (1144s all round) but I did feel there was more to come. As regards this question of cooling, the pads need heat in them to work at their best so you don't want to over-cool. They're unlikely to overheat on a car of this weight - it's more a function of the limiting factor, tyre grip or braking efficiency. The soft A048s on the front certainly helped with grip and whenever I've driven on slicks it was clear the brakes still had scope to work harder. Hoping now that the new setup will be closer to optimum - for me at least since everyone has different preferences on this subject! It's not pink, it's medium red violet...!
Mark Durrant Posted March 10, 2006 Posted March 10, 2006 Personally I would fit vented discs with Pagid RS15 pads Mark D Comp Sec
Bricol Posted March 10, 2006 Posted March 10, 2006 So is it really true all you big, heavy, vented brake disc owners really need the extra cooling - considering the weight of the car, the momentum created by it's mass being moved, the change in energy required to slow it down - and the front brake discs being out in the air ? After a "spirited" run down various Alpine passes last year, loaded up with luggage and the pressurised air containing device made of rubber hung on the back, the front wheels were slightly warm at the bottom of the big passes - whereas the back ones were rather warm - well hot - with nice cooked brake material smells coming from under the arch - so surely consideration ought to be given to improving the rear brake cooling? Bri (okay - "spirited" - I was told off by Debs for overtaking too many motorcyclists and making her worried about hitting them . . . but they were wayyy too slow down the hills . . . and up them . . .)
DohNut Posted March 10, 2006 Posted March 10, 2006 All this does assume that you can get hold of the disk with correct bolt pattern, diameter and offset at the correct price and you caliper will accept the vented width 😳 and it can be mounted with the correct offset and reach. Where are you thinking of getting the disk from? Nick here
Nifty Posted March 10, 2006 Author Posted March 10, 2006 I was going to have a word with HiSpec to see what they offer and get some dimensions. Keep off the straight and narrow 😬
Area Representative Crudders Posted March 10, 2006 Area Representative Posted March 10, 2006 Hi Nifty, I've been told that vented discs on the front of a 7 are overkill unless you're racing and really need rapid dissipation of heat - as said above, the discs already have plenty of air flowing around them. I went for EBC grooved and dimpled discs, which don't feel any different to the standard discs but in theory should give you some improved fade resistance by allowing hot gases to escape via the grooves and dimples, in the same way as drilling but without the risk of cracking. They also come in a nice bling gold cadmium plating so the area of the disc outside of the pad running area doesn't rust Crudders Edited by - Crudders on 10 Mar 2006 18:20:17
Nifty Posted March 10, 2006 Author Posted March 10, 2006 Gold bling discs ...... Crudders how could you ❗ ❗ 😳 😳 *confused* Keep off the straight and narrow 😬
Area Representative Crudders Posted March 10, 2006 Area Representative Posted March 10, 2006 Well, I say gold but actually it's that matt silvery goldy colour with all colours of the rainbow mixed in, like the average brake servo finish. I'm wriggling, does it show? 😳
Nifty Posted March 10, 2006 Author Posted March 10, 2006 Where did you get them from? Keep off the straight and narrow 😬
Area Representative Crudders Posted March 10, 2006 Area Representative Posted March 10, 2006 Nifty, they're called EBC Turbogroove and I got them from Powerstop. I did a bulk buy on them a few years back and I'm pretty sure as a club we still have a discount arrangement with them - 15% I think? Crudders
Nifty Posted March 10, 2006 Author Posted March 10, 2006 Thanks mate .. I've had a look. I'll check the discount issue and give them a ring. Keep off the straight and narrow 😬
rgrigsby Posted March 10, 2006 Posted March 10, 2006 Nifty it depends on what you are going to use them for, in general road use and light track use solid or drilled disks are fine. If you're going for longer track use or racing then the extra heat dissapation of vented discs help. The downside is vented discs are a lot heavier! Having said that the standard uprated kit from caterham includes vented discs although I'm fairly sure for 90% of the people that have them they never get anywhere near the limits of this set-up Cheres Rob G www.SpeedySeven.com
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