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I have 18's for track use on my 981. Looked at the CS PFC items but found 997.2 cup car (or GT3 or RS) front calipers work fine and heaps cheaper. The OEM rear calipers clear the barrels of my 18" wheel but it's quite tight. The braking performance is the same as the OEM calipers and there is no effect on ABS or traction control or ESC. The upside is is takes just a couple of minutes to change pads. Anyway that's my experience and I think the 718 brakes are the same as the 981.
997.2 GT3 or RS calipers have a lot of flex and they are inferior to 981/991 GT4/GT3 front caliper. If combined with slicks and r-comps that caliper cant simply keep up and brakes become your limiting factor. I have looked at that and the only plus side is the cheaper cost.
I think that's just your view of the 997 callipers re the flex. Not substantiated in many years of Porsche Cup racing running slicks. All endurance racing callipers by other manufacturers use the same basic design so that pads can be changed during a race. Porsche just decided to change supplier to PFC for 991 (and later for GT4 CS) cars for unknown and unpublished reasons.
997.2 GT3 or RS calipers have a lot of flex and they are inferior to 981/991 GT4/GT3 front caliper. If combined with slicks and r-comps that caliper cant simply keep up and brakes become your limiting factor. I have looked at that and the only plus side is the cheaper cost.
if they are poor why used on 997 cup and gt2 and gt3 rs 4.0? I have read of no complaints, could you point me to any posts, i am about to fit some so better to know.
Deman fits them in their 18” kit fir GT4 along with IIRC forgeline custom wheels?
Brembo makes the brakes for the 992 Cup (as well as the stock brakes on all street Porsches) and I imagine these might be an option too (18" wheels on that). Brembo recently replaced PFC as supplier for this and other factory race cars.
997.2 GT3 or RS calipers have a lot of flex and they are inferior to 981/991 GT4/GT3 front caliper. If combined with slicks and r-comps that caliper cant simply keep up and brakes become your limiting factor. I have looked at that and the only plus side is the cheaper cost.
Cough
Fanboy reply. Just like Porsche went with PFC recommendations because PFC claimed the same thing. You cannot tell me you can actually notice that with the thickness of that caliper metal.
Love the comment of slicks "and" r-comps.
if they are poor why used on 997 cup and gt2 and gt3 rs 4.0? I have read of no complaints, could you point me to any posts, i am about to fit some so better to know.
Deman fits them in their 18” kit fir GT4 along with IIRC forgeline custom wheels?
Just because they are used on 997 models it doesnt mean they have amazing performance. Are they good brakes for a street car and average track guy - yes, are they great for racing - not really ... you can see that Porsche Motorsport switched to a fully dedicated racing brake system on on 991 Cup / CS cars.
Porsche also never admited there is an issue with coolant pipes coming apart on 997 . Do they work - Yes, are they relible - No .
Fitting 997 calipers is a cheap way to be able to run 18" not necessary the best way. This is just my opinion based on my experience.
Fanboy reply. Just like Porsche went with PFC recommendations because PFC claimed the same thing. You cannot tell me you can actually notice that with the thickness of that caliper metal.
Love the comment of slicks "and" r-comps.
Cough
Ok, I am a fanboy and so is Porsche. Porsche and PFC are wrong and you are right.
Thanks for your view hopefully as my GT4 is down to 1358kg they will be good enough for me and my level of driving!!
The PFC stuff from TPC looks excellent - but jaw droppingly expensive at USD 14k - too much for me and so you are right, I got a set for front 997 Cup 2 brakes on for c.£1.8k (I bought a good used set and have had them fully refurbed with pistons and seals) and see how those do. They have almost exactly the same area of pistons (<1% difference) too so I don't need to think on master cylinder/balance. ABS etc. Currently, for those on here interested there is a pair of new 997.2 GT3 front calipers for sale on ebay for cUSD2k. I will post images of fit on the old GT4 section when I have done them with spiegler lines and Tarrett studs.
I wonder if the Essex/ AP Racing set up works with 18" that set up looks excellent too?
To the poster asking about the 992 Cup car, I believe that the 718 GT4 upright is the same physically as the 981 GT4 and 991 GT3 so not yet clear if those new Brembos will fit our upright. Also I cannot imagine the price !
Any updates on how the brakes/wheel combo work?
Would like to know spec on wheels and if you had to change any suspension part n(clearance issues, etc).
The Clubsports use a 18x 10.35 wheel at ET47.5, probably to make room for the toe link?????
I don't think you can run the AP Racing calipers on 18". They use a 394mm front rotor.
The 405mm PFC racing caliper also doesn't clear 18" wheels. The Sport model (380mm) does though.
That's correct....but the question is the wheel specs and any particular suspension piece that needs to be swap, like can you use any toe link or only some that have a low profile?
That's correct....but the question is the wheel specs and any particular suspension piece that needs to be swap, like can you use any toe link or only some that have a low profile?
Those wheel specs are 18x9" ET46 front and 18x10.5" ET44 rear. This does not require aftermarket toe links from a clearance perspective but I would expect a track-oriented GT4 to have them anyways to keep their alignment in check. At this offset, the 10.5" rear wheel ends right by the mounting location of the toe link but does not extend over it like an 11" rear would. This is what frees up the rear toe link selection.
02-17-2021, 04:28 PM
