bolarbag Posted April 22, 2008 Share Posted April 22, 2008 Say the frictional force required to stop the wheels from turning at 150mph is 500 (just a number plucked out of the sky). Stamping on Jspec brakes creates 600 and stamping on the BBK creates 800 therefor the Jspec brakes are just as good at stopping the car in that situation with those tyres. This of course is a theoretical example but its how i understand it. Good example, so my ankles will last that extra few year, thats a good enough reason to upgrade for me;) Link to comment Share on other sites More sharing options...
Scott Posted April 22, 2008 Share Posted April 22, 2008 Good example, so my ankles will last that extra few year, thats a good enough reason to upgrade for me;) Loads of good reasons to upgrade the brakes, its the justification of the price that some people have to look at. No way i could afford a big brake kit and i think the UK's are enough for me right now. If i had the spare cash i would have a set in a heartbeat Link to comment Share on other sites More sharing options...
paul mac Posted April 22, 2008 Share Posted April 22, 2008 I dont get all these opinions on UK brakes being a match for anything on the road...why? before the guy rushs off to buy the latest e-bay front brake set up i would suggest some bedtime reading http://www.stoptech.com/tech_info/tech_white_papers.shtml of particular note is the section on bias Link to comment Share on other sites More sharing options...
Guest DaveWilko Posted April 22, 2008 Share Posted April 22, 2008 I went from a golf gti 180 which has R32 discs with 2 pot callipers to a UK spec Supra and my leg hurt for a few weeks with the extra force needed to brake. I put this down to bigger discs and extra pots in the callipers spreading the force over a larger area. Recently though I had cause to stomp the brake pedal at 35mph on a dry shellgrip surface coming up to a set of traffic lights which had changed while i was looking the other way at another supra. I swear my brain bounced off the front of my skull! It stopped the car within 20 feet and left me 10 feet from the stop line! lol. (there was nothing behind me thankfully ) Link to comment Share on other sites More sharing options...
bolarbag Posted April 23, 2008 Share Posted April 23, 2008 before the guy rushs off to buy the latest e-bay front brake set up i would suggest some bedtime reading If I went for the ebay parts, believe me my car would be finished by now and I'd have quite a healthy bank balance, I'm awaiting on Stoptech replying about a possible Carbon Caramic kit for the Supra, if they can convert their regular rotors to the Carbon Ceramic ones then I dont see why not, Bias will be something I'll work on once installed, I'll be upgrading rears too Link to comment Share on other sites More sharing options...
paul mac Posted April 23, 2008 Share Posted April 23, 2008 If I went for the ebay parts, believe me my car would be finished by now and I'd have quite a healthy bank balance, I'm awaiting on Stoptech replying about a possible Carbon Caramic kit for the Supra, if they can convert their regular rotors to the Carbon Ceramic ones then I dont see why not, Bias will be something I'll work on once installed, I'll be upgrading rears too wow you must have money to burn fella i thought my brakes were expensive http://www.mkivsupra.net/vbb/showthread.php?t=121701&highlight=brembo Link to comment Share on other sites More sharing options...
bolarbag Posted April 23, 2008 Share Posted April 23, 2008 What do you do for bias, and how do they perform? I contacted System ST, I'd like to use these with the Brembo 6Piston Monoblocks, but they fobbed me off to Movit, I'm awaiting a reply from Surface Transforms, same company but I know their the manufacturers, these guys are just braking into the market but they have already gathered quite a bit of interest so their prices are likely to rise rather than go down My supra is basically my version of a kit car these discs should be a good investment Link to comment Share on other sites More sharing options...
Rob Posted April 23, 2008 Share Posted April 23, 2008 I run 2-pot calipers on my 2JZ-GTE Aristo but can outbrake much lighter cars...why? Video of me racing my Aristo at Le Mans and outbraking the Lotus. . I think you've messed up the link there, that video doesn't show you outbraking an elise, it links to another video showing an elise kicking yo ass out of every corner. Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 23, 2008 Share Posted April 23, 2008 "these guys are just braking into the market" Freudian spelling? Link to comment Share on other sites More sharing options...
Terminator Posted April 23, 2008 Share Posted April 23, 2008 I remember years ago some went to the trouble of working out the piston surface area for UK four pots and well a known 6 pot system. There was either very little difference, it was so negligible that the braking force was the same. For fast road use the UK setup should be fine, if regular track use is intended, then the six pots will take more repeated use. The is another reason to fit six pots but it has nothing to do with braking. Link to comment Share on other sites More sharing options...
bolarbag Posted April 23, 2008 Share Posted April 23, 2008 Increasing the area of the pad face will not increase the friction between the pad and the disc. Brake pads are the size they are as a function of other factors. Primarily to do with the size and number of calliper pistons. (Increasing the size of the piston increases the force that is being exerted on it by the hydraulic fluid, which increases the clamping force of the pad) However there are obvious geometric limitations as to how large a piston can be. Didnt have time to look at this thread until now, a quote from TL Licence here, It appears that these two statements almost contradict everything said in this thread, if you increase the size of the piston area you will increase the clamping force on the pad, Also The "brake horsepower" mentioned in the table posted refers to the amount of work done by the braking system to stop a car. Using my very rusty math's, to stop a 1600Kg Supra travelling at 100mph in 5 seconds would require an average of 708084 Joules / second of work to be done = 962 metric HP. This is basically the work done to convert 3540418.6 Joules of kinetic energy into other forms of energy (predominantly heat) in 5 seconds, which is exactly what the braking system is doing. According to the table given, if the TT 4 pots can do work at a rate of 1665HP, and the tyres were able to cope with the rate of deceleration, then it should be possible to stop the car from 100mph in a little under 3 seconds.... So does that mean extra clamping force will in theory stop the car in say 2seconds? As you all know TLicence is pretty well versed in having a career in motorsport, and has endured many countless hours of R&D Link to comment Share on other sites More sharing options...
Scott Posted April 23, 2008 Share Posted April 23, 2008 So does that mean extra clamping force will in theory stop the car in say 2seconds? Yes it does, if you had the tyres that could handle that force. Thats what i have been saying all along, the UK brakes are just as good at stopping a TT as any other brakes until you increase the rolling rad or the "stickyness" of the tyres meaning it would take more effort to stop the car. Link to comment Share on other sites More sharing options...
paul mac Posted April 23, 2008 Share Posted April 23, 2008 What do you do for bias, and how do they perform? i avoided any bias issues by using a matched front and rear set from the same model of car so effectively let Mr Mercedes worry about working out the bias, they are full floating so do make a bit of noise round town when going over bumps etc but nothing to drastic, they perform as well as they look and once hot the bite from high speed is awesome, i use porterfeild pads which i am really impressed with Link to comment Share on other sites More sharing options...
supratoy Posted April 28, 2008 Author Share Posted April 28, 2008 I think I'll try some different pads and go from there just so I get more use of the UK brakes and more experiance on them, so when I do upgrade I can feel the diffenece more easily if any on the roads. Cheers for all replys and information Link to comment Share on other sites More sharing options...
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