We know sometimes even the producers are wrong, guess you know better than anyone LOL, I have checked Pirelli's site, they say 12.5 ideal size for 325/660-18... another example would be the 335 R888 they say 12-12.5 to be ideal... idk why..

Now another example, the 315/30/20 R888 were specifically designed for GTRs to fit even OEM rims, oems are 10.5 only... on their website they say will fit 10.5-11-11.5... clearly the 10.5 are too small... gt-r guys are even running 335 MPSS (seems mpss are narrow -almost same width as 315 R888) on 10.5 wheels.

I run the new version R888R on 10.5size rim and guess a 11.5 would be ideal. fronts are 285 on 10 and they look fine

 

Take what the tire manufactures list with a grain of salt Fadi. Nitto for example lists a max of 12.5 for the 335 NT01. It's clearly better on a 13 fitting square while a 12.5 was pinched. The NT01 275s and 335s run very wide and would easily fit on a 10.5/13.5 but those sizes would not fit the car. OEM Porsche fitment of a 305/30/19 on the GT3 is on a 12" while the max tire listed by the tire manufacturer is an 11.5. Wider is always better from a performance standpoint.

 

I have decided to go on 997.2 gt3 brakes route as you recommended, but consulting your (really nice&helpful) list bellow I have found 6 caliper codes instead of 4 and have seen for fronts you recommended 2 models

997GT3.2 PCCB brake calipers: 997 351 431 92 and 997 351 432 92
But also
Calipers: 997 351 427 32 and 997 351 428 32

Guess the second are from 991 turbo ...

I would guess that the first ones are the correct buy for us, isn’t it ? Also will buy pads for gt3 997.2, not sure they are the same with 997 turbo . Thanks

 

Hey Fadi,
Just sent you a PM regarding the suspension. Regarding the 380 calipers, this is the part number for the front 7GT3 PCCB versions:

997 351 431 92 and 997 351 432 92

DO NOT use the 427.32 and 428.32 versions. Those are the 997TT PCCB versions which have larger pistons and do not have the zircon insulators. These are not rebuildable.

The 997GT3 pads are the same size pads as the 997 turbo version but they are a different compound.

Rear caliper part number are 997 352 425 98 and 997 352 426 98

 

Fadi if you want to run gt3 offset hats on your front rotors let me know. I'm going to be machining the adapters mounts for that offset soon as they are not an availbe part. Gives you more rotor options.

 

Hey guys, this is what I am going to do, hope is ok..

Girodisc 380mm front and keep the rear Giros 350mm
Pads wil be Performance Friction - PFB08 fronts and PFC08 rears, gt3 size

FRONT
997GT3.2 PCCB brake calipers: 997 351 431 92 and 997 351 432 92
Caliper adapters: 997 351 505 02
Adapter bolts: 999 073 313 09
997GT2 oil scavenge / vacuum pump 997.107.022.72
997GT2 vacuum line 997.105.116.73
997GT3 brake master cylinder - 99735591030 ?????? not sure if this is the right PN ????

REAR
997.2 PCCB rear Calipers: 997 352 425 98 and 997 352 426 98
Rear Supports: 997 355 503 10 and 997 355 504 10
Rear Brake lines: 996 355 585 11 and 996 355 586 11
Rear Caliper bolts: 999 067 040 01

Not sure if will need other adapters pt good to know we have options.


And one other question, does anybody have the measurements bellow just to know and make sure once and for all if one rim will fit and clear the 380mm+gt3 calipers
I am running oem 996tt uprights, etc.. I am looking for measurements like the ones bellow, I am trying to order my rims, but might need to wait on calipers delivery first. thanks

 

Use PFC08 front and 11 rear when using the stock ABS.

 

any body uses this design of rear wing? i am going to use some flares and getting car 1inch wider each side, 160cm/63" wing should still look ok I guess, or should I do even wider wing?

Also this German supplier can do only RSR type wing, not Cup... (pics bellow) Idk what that means in terms of aero, but here are some pics, should I go with the rsr instead of cup ?


In front might do Joe Toth splitter and canards, hope the splitter will fit as front bumper is going to be wider too

 

I honestly have no clue what difference their is between the RSR lid/wing and Cup. But one thing to be mindful of is airbox integration. Make sure they can utilize the proper GT2/turbo airbox inlet design. It is different between the CUP, RSR and GT2/turbo.

 

The car is about 72 inches wide IIRC. Im eying a 70 inch rear wing myself. My current is 62.

 

The stock decklid doesnt have an inlet IIRC (been a long time since I looked at one). Im wondering if that is actually necessary.

 

The stock turbo has a duct going to the plastic fan frame piece. The GT2 has an air inlet that ties to the two wing support inlets.

 

I use air filters above ICs, guess should work well in my case

 

Cup and RSR wing are similar Fadi. 7Cup wing is 67". The RSR is 72" if I recall. The one I run is 63" in the picture below. I'm not sure if anyone make a wider wing for our cars besides Getty. You can add a gurney flap to a wing to increase it's effectiveness if you don't want to go overly wide. If you end up with a large rear wing make sure your front aero is also increased. Vent the center radiator up and over the hood (instead of dumping air under the car) as this does wonders for donwforce. Add a splitter, canards, etc...

[url=https://flic.kr/p/KTkSRb]

I have both a Getty decklid (pictured below) and an OEM GT2 decklid/wing. Both have air intakes in the vertical uprights which are exposed to ram air feeding the OEM air box with positive pressure air via an inlet on the passenger side. Works well. Just make sure you have a tight seal between the lid and the air box. To get a better seal I transferred the seal to the air box and use a flat CF plate on the decklid. None of this really applies in your case as you have fender well intakes and the air inlets in the decklid are useless.

[url=https://flic.kr/p/LgJD8C]

 

Yes this is the route I am going to do, I already run a fully functional gt2 in front and adding splitter, canards etc.

Seems to me the 62-63" wing is exactly the same size as the body, from a functional and design perspective we should be able to run whatever size we want, but seems more elegant to be the same size ?! In this case I might need a custom size 65" wing (63+1+1)

Front will be wider too, I dont have pics of a turbo/gt2 based setup but looks like this, hoping to be able to fit in front 26.0" tires after doing again the radiator mod and all tricks that I know of, if can get this done, than the tire options is just... huooaaaaaa huge !