2005 Porsche Cayenne S - What do you know?

[ChargerX3]

Yea not finding it yet.

[Jeff V.]

I found a thread where people were talking about it, but it never went anywhere. They all jumped ship for some Chinese brakes that came out around the same time.

[aaronatstate]

Yeah I found the same.

Basically you want to find radial mounted calipers, and go with those. Doesn't matter what it comes off of, because you're going to have to get rotors with the correct hub size, and bolt pattern. In all the time and money I spent on trying to make a "cheap" big brake kit, I probably could've gotten StopTechs (at least the fronts).

What I found is that EvoX front rotors and Viper front calipers, with 2g rear rotors and Evo8/9 or EvoX rear calipers is the best, cheapest, easiest combo. The Viper front calipers require a simple bracket (and 5mm spacers for stock wheels), and no modifications are needed if you use Evo8/9 rear calipers and 2g rear rotors (EvoX rears require some grinding to enlarge mounting tab holes). The Viper/Evo front combo with the Evo/2g rear combo nets you a brake bias of 2.6:1 F/R, which is only slightly more front biased than a stock 2g at 2.53:1.

[ChargerX3]

I think i found your thread. Guy got them to work with 370Z rotors.

https://www.3sgto.org/threads/13543-my- ... che+brakes

Almost fit right out of the gate...almost.



Weld in existing holes. Then widen 5-6mm...



Build a spacer/bracket...



Then presto!

[Jeff V.]

I've got a spare set of VR4 knuckles if you want them.

[ChargerX3]

[quote=""Jeff V.""]I've got a spare set of VR4 knuckles if you want them.[/quote]

I might hit you up if I do this then.


My only question is, how much will I really be gaining from all this work. Will it be marginal or a vast improvement?

[DCIV]

https://www.facebook.com/groups/3gfgfdf ... 067558993/

Don’t think that’s the same one.


Coop

[Jeff V.]

Stock brakes are sufficient to lock up the tires and trigger ABS. Bigger calipers and rotors are basically bigger heat sinks. The only reason to go bigger is to combat brake fade in repeated high speed stops, like during track use.

Or to look cool. I'll be honest...that's was what I was after.

[aaronatstate]

[quote=""ChargerX3""]I think i found your thread. Guy got them to work with 370Z rotors.

https://www.3sgto.org/threads/13543-my- ... che+brakes

Almost fit right out of the gate...almost.



Weld in existing holes. Then widen 5-6mm...



Build a spacer/bracket...



Then presto!
[/quote]

370Z rotors do not fit perfectly, as the hub diameter is 1mm smaller. With manufacturing tolerances, sometimes the rotor wont fully seat on the hub.

Also, if you go to the 6 piston calipers, but don't change your rears at all, you will throw off the brake biases significantly. You could use Evo rear calipers and 2g rear rotors and get a pretty good brake bias, if you used the Porsche calipers for the 350mm rotors (like the ones you posted). If you use the calipers for the 380mm rotors, it throws off the brake bias a lot because the pistons are bigger.

Also not sure how well the pad would match up with the swept area of the 370Z/EvoX rotors (the swept area on them is the same).

[ChargerX3]

Yea, they would look cool and be a one off item. Currently I dont even drive either as they are not family friendly atm.

[ChargerX3]

[quote=""aaronatstate""]370Z rotors do not fit perfectly, as the hub diameter is 1mm smaller. With manufacturing tolerances, sometimes the rotor wont fully seat on the hub.

Also, if you go to the 6 piston calipers, but don't change your rears at all, you will throw off the brake biases significantly. You could use Evo rear calipers and 2g rear rotors and get a pretty good brake bias, if you used the Porsche calipers for the 350mm rotors (like the ones you posted). If you use the calipers for the 380mm rotors, it throws off the brake bias a lot because the pistons are bigger.

Also not sure how well the pad would match up with the swept area of the 370Z/EvoX rotors (the swept area on them is the same).[/quote]

Not sure i fully understood all of that. Should i be running EvoX rotors with the Porsche calipers?

Lost me on the rear calipers. Should i grab the rear Porsche units as well, or just go evo?

[aaronatstate]

[quote=""ChargerX3""]Not sure i fully understood all of that. Should i be running EvoX rotors with the Porsche calipers?

Lost me on the rear calipers. Should i grab the rear Porsche units as well, or just go evo?[/quote]

If you run EvoX rotors with the Porsche calipers, and then run Evo8/9 rear calipers were 2g rear rotors, the brake bias will be very close to stock.

370Z rotors may not fit every time as the hub diameter is slightly smaller than the 3/S or Evo hub (by 1mm).

Swept area of the rotor/pad, is the area that is actually in contact between the rotor/pad. Not sure if the 6 piston caliper brake pad would be fully utilizing the rotor face, or vice versa.

Trust me, Viper Calipers are easiest to swap in. https://www.ebay.com/itm/dodge-viper-20 ... SwNJZfY-kx

https://www.ebay.com/itm/2003-2010-DODG ... SwVbVfEJKJ

[aaronatstate]

Also, no guarantee the Cayenne calipers clear stock 18" wheels. Maybe with 370z rotors as they sit farther inboard (but potentially need to be machined for hub size). These are the viper calipers with EvoX rotors. You can see how close it gets to the barrel of the wheel.

[ChargerX3]

[quote=""aaronatstate""]If you run EvoX rotors with the Porsche calipers, and then run Evo8/9 rear calipers were 2g rear rotors, the brake bias will be very close to stock.

370Z rotors may not fit every time as the hub diameter is slightly smaller than the 3/S or Evo hub (by 1mm).

Swept area of the rotor/pad, is the area that is actually in contact between the rotor/pad. Not sure if the 6 piston caliper brake pad would be fully utilizing the rotor face, or vice versa.

Trust me, Viper Calipers are easiest to swap in. https://www.ebay.com/itm/dodge-viper-20 ... SwNJZfY-kx

https://www.ebay.com/itm/2003-2010-DODG ... SwVbVfEJKJ[/quote]
Ok, that clears things up. If the 370Z are 1mm undersized then I could probably get around that with a drill and a large sanding wheel.

I dont know how well it would be using the face either. The thread i posted doesn't show it well. It does appear the lower section (1-2cm) isnt used.

I was going to go your route when you posted a while back, but if I can pick of these calipers for $20 a pop then that will be hard to turn down. Then if i can fab up that bracket he has and re-drill the calipers I shouldn't be out much. Am i nuts?


[quote=""aaronatstate""]Also, no guarantee the Cayenne calipers clear stock 18" wheels. Maybe with 370z rotors as they sit farther inboard (but potentially need to be machined for hub size). These are the viper calipers with EvoX rotors. You can see how close it gets to the barrel of the wheel.

[/quote]

Good point. Keeping it inboard helps with wheel clearance and might open up further wheel options.


On a side note I might explore this on my Ram 1500. It might be a close fit with those as well. The Ram would be an added improvement over stock. Its probably my only gripe with the truck at the moment.

[aaronatstate]

I mean for $40 you're not out that much if it doesn't work.

Also the brackets in the Facebook post don't look too sturdy...

[aaronatstate]

Just looking at it a bit further, and going back through my research, it looks like 2010 Mustang GT500 rotors would work with Viper Calipers. That will get you 355mm (instead of 350mm) diameter, the hub size is 2mm bigger so it will fit over the hub, and it only sits 1mm further outboard than the stock rotor. Now I may have to look at getting GT500 rotors to test fit

[ChargerX3]

[quote=""aaronatstate""]I mean for $40 you're not out that much if it doesn't work.

Also the brackets in the Facebook post don't look too sturdy...[/quote]
Yea, it seems like a logical investment either way. I would be making my own brackets based off the 3sgto forum post i linked. Those look meaty enough. I would likely come back after the fact and weld them on the leading edge to the spindle once everything is properly fitted.
[quote=""aaronatstate""]Just looking at it a bit further, and going back through my research, it looks like 2010 Mustang GT500 rotors would work with Viper Calipers. That will get you 355mm (instead of 350mm) diameter, the hub size is 2mm bigger so it will fit over the hub, and it only sits 1mm further outboard than the stock rotor. Now I may have to look at getting GT500 rotors to test fit [/quote]

Now that is a big plus. Do you have unused brake pad on the outer edge?

[aaronatstate]

[quote=""ChargerX3""]Now that is a big plus. Do you have unused brake pad on the outer edge?[/quote]

Nope, the GT500 brake pad is the same part number as the EvoX brake pad and Viper ACR brake pad.

[ChargerX3]

Went back for lunch today to grab them. I left the one in the back cab of the fugly mighty max. Turns out someone found it and then took the remaining 3.