my complete BBK conversion using Cayenne S - BREMBO callipers

I know that there is another thread about this, but this is my actual own conversion in which I will try to find my way out of it.

the callipers that I bought are from a Porsche Cayenne S - 955 - front are Z18, so they've been designed to use 350x32 for fronts and rears with 330x28 :(
more informations can be found on the other thread about these calipers and their specs.
I dont care at this point of brake distribution, as I will check that later and solve it if necessary with a proportioning valve.

that beeing said, I have followed, in this forum and others also, how others have done conversions by using oem parts.
there are many benefits from doing it this way, instead of buying and spending tons on some branded products that are actually chinese.

So, for the front, after searching over catalogues it all came to: EVO X vs 370Z front rotors, basically 350x32 vs 355x32.

BUT, the 370Z discs have a -5mm offset, than the 3kgt ones, so probably for some of you that wants to use the OEM 18" wheels it will be possible as the calippers will sit inside with more 5mm - will let you know about that as I do have these wheels also here.
The front Nissan 370Z front rotors fit, as it has been done before here: http://www.3sgto.org/3000gt-stealth-...rakes-3-s.html
I didn't received yet the front discs, as this would possible be in the next couple of days.


now, the biggest issue on doing this is with the rear brake rotors and offcourse with the e-brake.
The donour cars for rotors, EVO and 370Z - have 330x22 vs 355x22.

The rear Cayenne calipers are designed to use a 330x28 brake discs, which is a hard to find one.
I've been looking around for the 28mm discs and couldnt find an OEM disc that was designed to be used on rear and be that wide.

So, for the rears I need a 28mm or I can use the 22mm ones?
This is very important, because if I choose to go with a 22 one, I would try to solve the e-brake with oem EVOX parts.

what others did:
on other platforms like vw, audi, etc.. they went with 22 ones and currently live happy - no problems at all, at least not mentioned on forums.

If I decide to go with a 28mm rotor, I will have to go with a front evo7-8-9 rotor which I can find them in 30-32mm width, remove the ebrake components and install a parking valve(or how its called).
I couldnt found any mechanical calipers that will fit over a 22mm(Willwood, brembo). don't know about Audi electrical ones..

next week probably I'll check to see how the complete calliper with pads will seat on a 22mm disc.

Quote:

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Originally Posted by stealthTT

remove the ebrake components and install a parking valve(or how its called).

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This is what I was thinking when I was reading your post. If it gets too big of a PITA use a valve in the line. I had one on my rail buggy and it worked great. Some people might not want a valve showing though, even though thay are small.

i don't agree to use the valve as it seems that if you have pushed your brakes hard, high temps, and after that you've parked it and use the valve, when it cools down it will slip. thats what i've read from others that are using this form of parking brake

now, it seem that the wilwood mechanical calipers are the best to use as I could use a custom spacer in order to accomodate a wider than 22mm discs.
they have 2 types of parking calipers

the best one they are selling is this one, as it comes with all the needed brakets, etc..:

http://www.wilwood.com/Images/Calipe...hanical-lg.jpg

Wilwood High-Performance Disc Brakes - MC4 Mechanical Calipers



and these are better as it can take a 35mm disc :)

http://www.ipsco.org/Custom%20Servic...g%20Brake1.jpg

http://www.ipsco.org/Custom%20Servic...ng%20Brake.htm

Don't park on a hill after you beat the shit out of the car http://www.bawcforums.org/vbb/images/smilies/533.gif

Do the EVO rotors have the same offset as the 3/S? I have wanted to fit 2nd gen callipers to the front of my 1st gen GTO but there are no good quality rotors around any-more available locally in that size so my thought was to just make a bracket so my first gen callipers [1st gen and 2nd gen callipers have the same "calliper" but the 2nd gen has longer mounting tabs] will work on an EVO or 370Z rotor. DBA stopped making rotors for the 3/S but still make EVO ones. Alternatively with the 5mm neg offset of the 370Z rotors that might help with wheel fitment and mounting the brackets.

Quote:

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Originally Posted by GTOJOE

Do the EVO rotors have the same offset as the 3/S? I have wanted to fit 2nd gen callipers to the front of my 1st gen GTO but there are no good quality rotors around any-more available locally in that size so my thought was to just make a bracket so my first gen callipers [1st gen and 2nd gen callipers have the same "calliper" but the 2nd gen has longer mounting tabs] will work on an EVO or 370Z rotor. DBA stopped making rotors for the 3/S but still make EVO ones. Alternatively with the 5mm neg offset of the 370Z rotors that might help with wheel fitment and mounting the brackets.

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there is one thing the EVO's and 370's are 32mm wide, but I think thats not a problem as if I remember corectlly supercar was selling wider rotors for our cars.
here are the specs for the VR4 2nd gen, 370Z and EVO X ones, as OEM.

3000GT vr-4 2nd gen:
Attachment 6327

370Z - the 355mm ones, what I've got:
Attachment 6328

and for the EVO X, I couldn't find a picture like for the upper ones but I have wrote de specifical numbers, just like in the picture.
the good thing on the other hand with the EVO ones is that you dont need to machined them on the center bore as they are the same.

the specs:
Diameter (1)[mm]: 350
Width (H2)[mm]: 32
Center Bore(3)[mm]: 69
Depth(offset) (H4)(mm): 43,7

so vr-4 has a 45mm offset while the evo have 43.7, so they will sit on an outer position that the stock vr-4 ones.
calippers could clear the oem wheels but it's a little bit risky as the OEM wheels are not concave like some aftermarket ones.
If I were you, I would go with the 370Z ones - its safer.

what you can look up for are the EVO6 front rotors also. the picture that I have is for the EVO6, but it seems the 8&9, probably 7 also, have the same specs on them.
Attachment 6329

I would have went further to help you by testing stock vr4 calipers on my discs, but i dont have oem wheels close to me. what I can tell is that I will test oem wheels once I have my bbk on the car.
hope it helped.

I don't know why someone wanting to do something like this doesn't just build brackets to extend the stock calipers out further. There is nothing really wrong with the stock caliper, it just needs a bigger rotor.

Quote:

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Originally Posted by Forest Gump

I don't know why someone wanting to do something like this doesn't just build brackets to extend the stock calipers out further. There is nothing really wrong with the stock caliper, it just needs a bigger rotor.

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if you've asked me I'll answer here short:
first because I've got them sitting arround for pretty long time, the cayenne calipers
second because the 19" volks that I've got will just look silly with stock stealth callipers that have been shaved by stupid previous owner because ricer wheels didn't fit even after he went with spacers.
also because of wheels, cause the rears didnt didnt fit - the rears are too small and hit the wheels even if the wheels are designed to acomodate large brakes.

and the last one, because race factor :)
jk,
now, I really like how they've performed on the 2500kg Cayenne even when I've pushed them hard enough.

and second - why should I invest the same time and money(minus the caliper price) into something that will not be way better than before.
there were some brakets available years ago, afaik, but not anymore
why?
because not so many of us grabbed them.

There were wide spacer brackets offered by supercar, but I never saw anything that would just move the stock caliper outboard. It would be laughably simple if you were willing to thread the caliper itself (would use a threadsert if you were smart). I could cut one out with a grinder.

I just wish one of these threads would actually end in a completed setup that works. I've probably seen 10 over the last 10 years and never seen one where someone doesn't give up. I hope it works out for you.

Quote:

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Originally Posted by Forest Gump

There were wide spacer brackets offered by supercar, but I never saw anything that would just move the stock caliper outboard

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like I said, I thought I have seen something done, didnt knew that it was just a spacer in order to use a wider rotor.

Quote:

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Originally Posted by Forest Gump

It would be laughably simple if you were willing to thread the caliper itself (would use a threadsert if you were smart). I could cut one out with a grinder

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i dont get it? maybe its my bad english again, or I'm not that smart as I thought :)
why should I thread the caliper?
the cayenne ones? for what?

Quote:

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Originally Posted by Forest Gump

I just wish one of these threads would actually end in a completed setup that works. I've probably seen 10 over the last 10 years and never seen one where someone doesn't give up. I hope it works out for you.

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the fronts it seems that are an easy task.
got the front rotors, and I'm very happy as they are way larger than stock ones.

the rears are a different story as I would really like to use the stock e-brake system and till now I couldn't found a car that uses 330x28 and also fit the ebrake system.

on some VW and Audi platforms they are using rears 2008 CL, CLS, S 63 AMG rotors which are the same dimensions as i need, but for the ebrake they use a mechanical caliper also as it doesnt fit.

the e brake calipers that they are using are from Viper, Ferrari and Jaguar R(E, S, etc..) which are kind a hard to find here where I live.

but, I need this done in short time so will see.