This is great. I've got an 07 Cayman S that might get a v8 soon. I might do the brake upgrade in stages, this would be interesting to test. I will say that with the increased rotor weight and if you're moving from a 17 or 18 up to a 19" set of wheels. The increase in wheel/tire weight along with the heavier rotors...this can be felt. With such an increase in unsprung weight you're giving the damper a lot more weight to control, and if you're still using stock dampers, you're asking a lot more of them and I would be worried about a loss of resolution/ refinement to the ride (this will be compounded by a slimmer sidewall). Also, the caliper spacers with the washers is a mickey mouse solution. A machinist will turn up those spacers to your specs in very little time. Don't get me wrong, I love the interchangeability and the ingenuity, it's just the increase in weight and the washers with the spacers. I would check on those often.
Depending on which suspension setup you have, I would not be too concerned about the added weight of larger wheels and tires. 19" wheels were a standard option on many of the 987 models and the cars were set up properly to accommodate for this. Mine came with 19" wheels from the factory and my current wheel/tire combo is even lighter than stock. While I have felt the added weight from the larger rotors, it hasn't been enough to feel problematic on the mountain roads. I'm not sure I understand the issue with the washers. Obviously, my measurements were off and I needed 1mm taller caliper spacers. Next time I take things off, I'll consider replacing the spacers I got with a single unit. But a 1mm Grade 8 washer shouldn't cause any problems. There are dozens of kits to retrofit these exact Porsche brakes on other cars and they use various size washers and spacers to accommodate for the rotors being used. What I have pieced together in this video isn't unique. There's even a company that sells a kit for the 987 to run the GT3 rear rotors on the front. But that kit cost $500 and my self sourced route cost me $60 for the same parts.
@@MyNameIdeasWereTaken The issue with the washers is the optics, not the failure rate. The P-community is attracted to refinement and clever engineering. For mock up and fitment, cool. For personal projects? Awesome. But as a how-to walk through, the washers make the concept come off as being unsafe or unfinished. Not a criticism, just an alternative perspective.
@@Russell_and_Rosko Makes sense! Though GiroDisc just offers washer spacers as well, exact same as what I sourced, and they've received a lot of praise in the Porsche aftermarket community. Their floating rotors are far superior, but their solution for spacing the caliper is no different.
FYI, I have measured the clearance with my 987 Boxster S 18"wheels and there is around 25mm clearance. That would leave 9mm clearance. I'm very close to needing new rotors anyway....
Follow the video and ready to install the rotors… only to find out they are 28mm thick. New stock 987 Base rotors for my car are 24 mm thick. 987 caliper will not fit over this 28 mm thick rotor. Yes I double confirmed the part numbers. These are SHW Performance rotors from FCP euro. This mod is for S models unless you want to upgrade calipers too
Those calipers shouldn't require spacers, but I believe the GT3 has different knuckles for the caliper mounting points. So it's worth confirming on the forums.
Hello Michael! Great video and excellent low budget upgrade! I have a couple of questions, looks like you had to get longer screws that hold the rotor to the hub but that was not mentioned...I guess you need to measure the original screws and add the thickness of the spacer to figure out the length of the new longer screws. My second question is if you have idea this can be done on a 2003 Boxster S, not sure if my car has the same rotors as the 987. Thank you!
Oops, I forgot to mention those screws. They were about 7mm longer than stock. I just got some generic screws from the hardware store for this. I would imagine a similar application could be done on the 986. Though it would depend on your current front rotor width and offset. You'll need to do some research on compatibility. Good luck!
Hello, I have another question for the rear brake discs in size 350mm. Which sizes should I look at to find some. Do you think there is a possibility to mill off 34mm thickness to 28mm? Thanks in advance for your reply. Attila
While you could turn the rotors down to 28mm, that would be too much surface material and be dangerously close to the cooling fins. For a rear upgrade, I would look at what Girodisc has to offer. You'll also need to consider different rear brake lines if you're going to move the rear caliper that much further out. This may also upset the braking balance and ABS.
@@MyNameIdeasWereTaken Do you think if we take off 3mm on each side that this would cause a problem? That about the ABS I don't understand what you mean by that. I think the brake lines can be customised. The Pn you gave for the front ones have been ordered and will arrive one day. Then I will see if I can't customise these for the rear. Hope I'm not bothering you too much with my questions. Thanks in advance. Kind regards Attila
@@AttilaFarkas-n4g 6mm total is still more than I'd suggest, as Porsche recommends replacing the rotors once they have worn down by 4mm. The ABS is calibrated for the front brakes being larger than the rears. If you make the rear brakes too large in comparison to the front, the rears can potentially lock up during ABS activation. But I would be very interested in your findings, so please report back!
@@MyNameIdeasWereTaken Hi Mikael, Thanks in advance for the info. When the front ones are installed I will let you know and then I will look into the rear ones. Best regards Attila
Helo Michel, I had to watch your video at least 10x to understand that the 350diameter disc is actually for the rear, and you then use it in the front but with a 7mm Spacer. So can you use the same brake disc for the rear? Or do you still have the 300mm diameter on your boxter. Thanks in advance for your reply. Attila from Belgium
The rear has a fairly different offset, and it would also be a much further stretch on the brake lines. I kept the stock 300mm on the rear. If you want to upgrade the rears, I would consider Girodisc.
@@matyasfarkas1080 Hello Matias, Igen, nagyon jól sikerült!!! Elöl és hátul is. Én a Gt3-asból 4 tárcsával közlekedem. Amilyen féknyergek vannak elöl, olyanok vannak hátul is. A Cayman már sokkal jobban fékez. Egyetlen hátránya van!!! Az autó vizsgáztatása nem engedi ezt és egy időre visszatettem az eredetit. Sok üdvözletet. Attila
Pushing out the calipers has the same effect on the bolts as the bigger discs have. The fulcrum point is bigger... so be prepared for snapping bolts. And than you're in a big pile off Barney.
The use of the longer factory bolts is no different from what you get on the Porsche models that come with larger factory brakes. For the various 987 and 997 models that share the same knuckle assembles: rather than a spacer on the caliper bolts like I did, the larger calipers themselves have extended brackets. I'm not asking any more from the bolts than Porsche already is. On most cars, where the caliper bolts run parallel with the axle, then the bolts are subject to force while braking. But with the perpendicular layout on Porsches, the bolts shouldn't be experiencing any sort of fulcrum forces. If they do, then the caliper is not seated properly and then you have bigger issues.
I was able to find them on ebay. As mentioned in the video, I would look for something a bit taller than what I sourced. 16mm wasn't quite enough for a comfortable amount of clearance.
This is great. I've got an 07 Cayman S that might get a v8 soon. I might do the brake upgrade in stages, this would be interesting to test.
I will say that with the increased rotor weight and if you're moving from a 17 or 18 up to a 19" set of wheels. The increase in wheel/tire weight along with the heavier rotors...this can be felt. With such an increase in unsprung weight you're giving the damper a lot more weight to control, and if you're still using stock dampers, you're asking a lot more of them and I would be worried about a loss of resolution/ refinement to the ride (this will be compounded by a slimmer sidewall).
Also, the caliper spacers with the washers is a mickey mouse solution. A machinist will turn up those spacers to your specs in very little time.
Don't get me wrong, I love the interchangeability and the ingenuity, it's just the increase in weight and the washers with the spacers. I would check on those often.
Depending on which suspension setup you have, I would not be too concerned about the added weight of larger wheels and tires. 19" wheels were a standard option on many of the 987 models and the cars were set up properly to accommodate for this. Mine came with 19" wheels from the factory and my current wheel/tire combo is even lighter than stock. While I have felt the added weight from the larger rotors, it hasn't been enough to feel problematic on the mountain roads.
I'm not sure I understand the issue with the washers. Obviously, my measurements were off and I needed 1mm taller caliper spacers. Next time I take things off, I'll consider replacing the spacers I got with a single unit. But a 1mm Grade 8 washer shouldn't cause any problems. There are dozens of kits to retrofit these exact Porsche brakes on other cars and they use various size washers and spacers to accommodate for the rotors being used.
What I have pieced together in this video isn't unique. There's even a company that sells a kit for the 987 to run the GT3 rear rotors on the front. But that kit cost $500 and my self sourced route cost me $60 for the same parts.
@@MyNameIdeasWereTaken The issue with the washers is the optics, not the failure rate. The P-community is attracted to refinement and clever engineering. For mock up and fitment, cool. For personal projects? Awesome. But as a how-to walk through, the washers make the concept come off as being unsafe or unfinished. Not a criticism, just an alternative perspective.
@@Russell_and_Rosko Makes sense! Though GiroDisc just offers washer spacers as well, exact same as what I sourced, and they've received a lot of praise in the Porsche aftermarket community. Their floating rotors are far superior, but their solution for spacing the caliper is no different.
Wondering if you could mill off some of the disc that the stock pad is not sweeping to save weight without losing strength.
FYI, I have measured the clearance with my 987 Boxster S 18"wheels and there is around 25mm clearance. That would leave 9mm clearance. I'm very close to needing new rotors anyway....
lmfaooo DO IT
Lol did you end up doing it 😂
Great idea and video. Do you have a part number for the front rotors?
Part numbers are in the description. 997 GT3 Rear Rotors:
99735240502 and 99735240602
Wonder if this works on the 986
Thanks for sharing. Do you happen to know the difference in rotor weights? Also, what size/brand hole saw?
Follow the video and ready to install the rotors… only to find out they are 28mm thick. New stock 987 Base rotors for my car are 24 mm thick. 987 caliper will not fit over this 28 mm thick rotor. Yes I double confirmed the part numbers. These are SHW Performance rotors from FCP euro. This mod is for S models unless you want to upgrade calipers too
Hi, do you think that when mounting the caliper of the 997 GT3 or the 997 Turbo then it would be necessary to mount the spacers for the discs?
Those calipers shouldn't require spacers, but I believe the GT3 has different knuckles for the caliper mounting points. So it's worth confirming on the forums.
Hello Michael! Great video and excellent low budget upgrade! I have a couple of questions, looks like you had to get longer screws that hold the rotor to the hub but that was not mentioned...I guess you need to measure the original screws and add the thickness of the spacer to figure out the length of the new longer screws. My second question is if you have idea this can be done on a 2003 Boxster S, not sure if my car has the same rotors as the 987. Thank you!
Oops, I forgot to mention those screws. They were about 7mm longer than stock. I just got some generic screws from the hardware store for this.
I would imagine a similar application could be done on the 986. Though it would depend on your current front rotor width and offset. You'll need to do some research on compatibility. Good luck!
Hello,
I have another question for the rear brake discs in size 350mm.
Which sizes should I look at to find some.
Do you think there is a possibility to mill off 34mm thickness to 28mm?
Thanks in advance for your reply.
Attila
While you could turn the rotors down to 28mm, that would be too much surface material and be dangerously close to the cooling fins. For a rear upgrade, I would look at what Girodisc has to offer. You'll also need to consider different rear brake lines if you're going to move the rear caliper that much further out. This may also upset the braking balance and ABS.
@@MyNameIdeasWereTaken Do you think if we take off 3mm on each side that this would cause a problem?
That about the ABS I don't understand what you mean by that.
I think the brake lines can be customised.
The Pn you gave for the front ones have been ordered and will arrive one day. Then I will see if I can't customise these for the rear.
Hope I'm not bothering you too much with my questions.
Thanks in advance.
Kind regards
Attila
@@AttilaFarkas-n4g 6mm total is still more than I'd suggest, as Porsche recommends replacing the rotors once they have worn down by 4mm.
The ABS is calibrated for the front brakes being larger than the rears. If you make the rear brakes too large in comparison to the front, the rears can potentially lock up during ABS activation.
But I would be very interested in your findings, so please report back!
@@MyNameIdeasWereTaken Hi Mikael,
Thanks in advance for the info.
When the front ones are installed I will let you know and then I will look into the rear ones.
Best regards
Attila
Helo Michel,
I had to watch your video at least 10x to understand that the 350diameter disc is actually for the rear, and you then use it in the front but with a 7mm Spacer.
So can you use the same brake disc for the rear?
Or do you still have the 300mm diameter on your boxter.
Thanks in advance for your reply.
Attila from Belgium
The rear has a fairly different offset, and it would also be a much further stretch on the brake lines. I kept the stock 300mm on the rear.
If you want to upgrade the rears, I would consider Girodisc.
Hello,
Thank you for this quick reply.
What is Girodisc?
Is this a brand of brake discs?
Many greetings 👍🙋♂️
Sorry for my question.
I found it😉.
Many Porsche greetings
Attila from Belgium
Szia Attila,
Megvalósítottad végül a nagyobb tárcsás átalakítast?
Köszi
@@matyasfarkas1080 Hello Matias,
Igen, nagyon jól sikerült!!!
Elöl és hátul is.
Én a Gt3-asból 4 tárcsával közlekedem. Amilyen féknyergek vannak elöl, olyanok vannak hátul is.
A Cayman már sokkal jobban fékez.
Egyetlen hátránya van!!! Az autó vizsgáztatása nem engedi ezt és egy időre visszatettem az eredetit.
Sok üdvözletet.
Attila
Pushing out the calipers has the same effect on the bolts as the bigger discs have. The fulcrum point is bigger... so be prepared for snapping bolts. And than you're in a big pile off Barney.
The use of the longer factory bolts is no different from what you get on the Porsche models that come with larger factory brakes. For the various 987 and 997 models that share the same knuckle assembles: rather than a spacer on the caliper bolts like I did, the larger calipers themselves have extended brackets. I'm not asking any more from the bolts than Porsche already is.
On most cars, where the caliper bolts run parallel with the axle, then the bolts are subject to force while braking. But with the perpendicular layout on Porsches, the bolts shouldn't be experiencing any sort of fulcrum forces. If they do, then the caliper is not seated properly and then you have bigger issues.
where did you source the caliper spacer?
I was able to find them on ebay. As mentioned in the video, I would look for something a bit taller than what I sourced. 16mm wasn't quite enough for a comfortable amount of clearance.
That just seems rough.. and not needed for a 987…
Congrats you just spent money and time to make your car worse.
Explain?
Yes do