Brake Bias Controller, Lightened Pulleys + Tail Shaft

[JAGR33]

Troy - 1:18.70, your pretty much on the money, people forget how heavy the GTR is, so pulling up a car so heavy needs decent brakes.

Geoff - you do have a point to an extent, but good pads and fluid don't cut it with the power our cars are running. In a GTS-T with mild power maybe yes, if I went with your recommendation I'd be lucky to do 2 laps without ending up in the rough, and also the braking performance is not the same..

e.g at Calder I reach around 250km/h on the straight, hit the brakes at the 200m mark to take turn 1 at about 70km/h. I'll find it very hard to believe the standard calipers would match this performance, using the same car...

I agree, higher corner speeds means less use of the brakes, but our cars need the bigger brakes to wash off speed before tight corners (e.g turn 1 @ Calder).

Another good example is Chris (Scotsman) still runs the standard calipers all round, but with the best rotors/pads/fluid, he seems to be doing fine although he's power is around the 270rwkw mark. Add another 100rwkw and watch those brakes melt after a couple laps...

Tracks such as Calder and Winton are very hard on brakes, my car has never even hinted any sign of fade or braking performance, even after 4 laps....

[GTRgeoff]

Jack, that is of course a great time and to be commended, my point though is that with a properly setup car and the right training and focus on linking critical lap sections (such as not power oversteering on many critical corners ) your times would plummet and your brakes would take far less beastings. Of course it is difficult for a lot of people to make the leap in their minds as to just how fast they can go through a corner or how late they can brake. Racing is not just one off lap times but consistent fast lap times for the course of a race. That is the job of engineers to solve within rules. I have some experience in such things, not even remotely that of SK but enough to know where to find the critical improvements. I've also undertaken concentrated formal training and education in the field with a long past view toward graduating to professional race engineer. I have since moved on but the knowledge elements are still the same.

Now the GT production cars run on slicks which can confuse issues, so I've included the link to IPRAVic for comparison and with their power restrictions and on Yokies they are more than comparable and you might say handing our high powered cars their asses on the balance. And these aren't really fast race cars. Swing by SelectMaz sometime for a tour of the IP RX-7 series 2 NA they have that holds lap records in its class and be amazed by how small the brakes are. Sure we can argue power and weight and thermal budgets, but the fact remains that they simply corner a truckload faster, and that is simply good setup. http://www.ipravic.com.au/frames.htm

All Improved Production Cars must run on the same tyre - the Yokohama A032R Race tyre and users claim it is a piece of poo compared to RE55S. http://www.yokohamatire.com/TireIntro.asp?TireID=2

Troys thread for lap times and comparos.

http://www.skylinesaustralia.com/forums/in...c=46199&hl=

So my fundamental argument is that with the right work and setup and driver, you don't need the big brake setup. Sure it is good for the progressive feel of the setup but ABS generally knocks that about anyway while hiding a lot of balance issues, and the heat capacity benefit is fantastic as well but that just hides other problems with a big bandaid. And of course a GTR is a big wad of money to have circulating too and no-one wants to write one off but I think you would be seriously surprised if you made the next step and undertook some training and committed to setting the car up well. It would of course be entirely uncomfortable on the road, but that is the compromise.

It's just unfortunate my last few years being disabled have prevented me from developing the GTS25t to a point where I could demonstrate these things, and time now won't permit but I have a firm understanding of where it would be and it wouldn't be circulating with other gtst's.

[JAGR33]

Geoff, I totally agree with what your saying in regards to big brakes are not essential, but the issue here is that we're talking about street registered GTR's that see the track. Its all good not having big brakes on a car that weighs 1000kg, add another 600kg's and the brakes will definetly not perform as good.

Improved production cars are race cars, we're talking about GTR's that are driven on the street and taken to the track. I refuse to rape my car in regards stripping out interior and setting it up as a full blown race car, what's the fun in that?? I want to enjoy my car on the street, that's the difference. Surely I could strip it, put a cage in it, carbon fibre doors, full slicks and wind up the boost with race fuel to give me over 400rwkws, the times will drop dramatically, but I can't see myself looking at it in the garage on a fine sunday morning thinking it would be nice to take it for a spin through the hills, when obviously I couldn't..

So I guess what I'm trying to say is that the discussion here is based on street registered GTR's, not race cars competing in a race series..

[GTRgeoff]

Jack, not saying you would need to strip out and cage, though a cage at those speeds is definitely worthwhile, or fit CF doors and crank the boost up. IP GTR's aren't far off the pace of the RX-7s and with a cage are close to stock weight. If you take a moment to contemplate and spend some time in discussions with race engineers then the arguments answer themselves.

Anyway, well off topic so I'll keep my education and experience to myself.

[JAGR33]

Your education and experience is very well welcomed around here!!!

[justinfox]

I'm with Neil. I like going all out!

Good points raised. Can test them first and see how they go, that seems logical to me but hey buying a set of brakes which cost $12k (when you can buy a whole car for that) ain't that logical is it?!

I'd like to know a ballpark figure for a brake bias controller set-up? Anyone have any ideas?

[blk180]

http://www.skylinesaustralia.com/forums/in...53125&st=20

Gaint has just done this with his AP racing setup maybe ask him.

[justinfox]

Sweet, hassling the giant now.

[ferni]

What did you end up doing with this Justin?

[justinfox]

Nothing is tested yet but here's the update:

Got brakes?

Greddy lightened pulleys

[88silhouette]

bloody beautiful!

[Roy]

I so need to get off my ass and work in Qatar. The money my industry pays here means i cant even afford to mod my GTSt let alone build a tasty GTR