| Author | Message | ||
| Ben Cannon (Artherd)
Member Username: Artherd Post Number: 724 Registered: 6-2002 |
Great words by Mitch. Unless you *REALLY* know what you are doing (and if you do, you'll install a full custom pedal assy with a bias bar.) don't fsck with the brake bias, and that means increasing rotor sizes in proportion, and keeping the proportion of the caliper bore sizes (and their absolute sizes relatively close to avoid pedal sponge.) the same. One last thought; Brembo makes kits (and OEs the Porsche rotors too...) to adapt most of their calipers to most cars. Surely they make a big-brake kit for the 308? (this would save you all the R&D of doing your own, big $.) Best! Ben. | ||
| Mitch Alsup (Mitch_alsup)
Member Username: Mitch_alsup Post Number: 969 Registered: 4-2002 |
My take: you want to increase the front and rear rotors in the same proportion (diameter). This leaves the reletive front to rear leverage unchanged. Front_diameter_old/rear_diameter_old = Front_diameter_new/rear_diameter_new you want to end up with the same ratio between the total caliper bore area front and rear. This leaves the brake proportioning the same. Front_caliper_area_old/read_caliper_area_old = Front_caliper_area_new/rear_caliper_area_new This will avoid confusing any ABS system that may (or may not) be on the car. As long as you are in there doing custom work, duct some cold air to the front rotors. In addition, these rotors are big enough that you can duct cold air to the center of the rotor and use the vanes to propel cooling air through the rotors to enhance heat disipation capabilities. | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 653 Registered: 5-2002 |
I think just trying put the fronts on will all cause a serious bias problem too, it'll need a bias valve either way. I hadn't thoght about the master cylinder, it'll need that too. On the parking brake, there are a few ways to do it. Adding a mechanical lever to the caliper like you have is one (the 308 does anyawy...I think that is what the 328 has too). This is easy on a 1 piston caliper, do-able on a 2, but a nightmare on a 4 piston. The other 2 commom set-ups are a drum brake inside the rotor hat or a small mechanical caliper. Another option is what I'm working on for my car. I bought big brembo rotor, had hats made and as so as I find some time (I'm working on the engine at the moment...still...) I'm going to modifiy the stock calipers to fit the new rotor. No master cylinder or bias valve to add....although not quite as nice either...  | ||
| chaz richards (Chaa)
Junior Member Username: Chaa Post Number: 74 Registered: 5-2003 |
Hi Omar me again, just looked at the pics of the calipers.And by the looks of them there bloody big so you will need a new break cylinder becourse you are buying front and rear.And a bias valve mate.If you dont you break pedal will be very low if at all,becourse think about it the volume of fluid in your calipers will be moor than in your 328 master cylinder. As i said dude go fronts you may get away with it. | ||
| chaz richards (Chaa)
Junior Member Username: Chaa Post Number: 73 Registered: 5-2003 |
Omar you only realy need the front ones, so your hand break will still remain.After my expereance in rooding cars i do know that if the caliper bores are bigger than standard you will also have to get a larger break master cylinder,and if you change both front and rear calipers you might also have to start looking at front and rear bias valves.So i have found that changeing only the front calipers is easyer becourse you will still have the same break bias and you will probably still be able to use your 328 master cylender.After all around 70% of breaking is done by the front calipers. sorry about my spelling dude. | ||
| Omar (Auraraptor)
Member Username: Auraraptor Post Number: 881 Registered: 9-2002 |
Thanks for the help Mark, just wondering why on this detail. Don't porsche's have a handbrake system/setup? | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 652 Registered: 5-2002 |
"If I bought a set of porsche calipers...would I be able to put them on my Ferrari 328 (after I got 18 inch wheels as well)?" yes, probably "Would I be able to get a custom disk holder to hold the floating disks?(I assume they have diff. bolt patters) Yes "Would everthing else fit right? What of offset?" No, absolutely not. You�ll need to make brackets to mount the calipers and live without a parking brake or add a mechanical aftermarket unit. It�s a lot of work, but I believe it can be done. Plan on at least $2000 of additional parts to install it. | ||
| Omar (Auraraptor)
Member Username: Auraraptor Post Number: 879 Registered: 9-2002 |
If I bought a set of porsche calipers...would I be able to put them on my Ferrari 328 (after I got 18 inch wheels as well)? Would I be able to get a custom disk holder to hold the floating disks?(I assume they have diff. bolt patters) Would everthing else fit right? What of offset? I want to put this on: RUF Brakes |