The 997 undersides, wheels
09-30-2006, 06:11 AM
#16
Poseur
Rennlist Member
Rennlist Member
Thread Starter
I apologise for the bad data that I put out earlier. I finally found my notes and have attached a couple of pictures to show the growth of these wheels over the years. The late wheels are the XRR rims (rear, 11.5 x 19 inches) contrasted with one from the 1980s,--a Fuchs forged 8x16 inch rim. The front, mounted XRRs weighed in at 49.5 to 50 lbs a piece. The rears at 62.5 to 63 lbs a piece.
Recall the wheels, alone, are as follows:
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
(Contrast this with the 7x16 and 8x16 Fuchs forged rims at approximately 15 lbs each).
The final shot is of the mandatory wheel hangers needed to aim the dismount and mounting of these wheels onto the car without risking damage to the ceramic brake rotors. One is a pretty good idea for the regular brakes and two are needed for the PCCBs.
Recall the wheels, alone, are as follows:
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
(Contrast this with the 7x16 and 8x16 Fuchs forged rims at approximately 15 lbs each).
The final shot is of the mandatory wheel hangers needed to aim the dismount and mounting of these wheels onto the car without risking damage to the ceramic brake rotors. One is a pretty good idea for the regular brakes and two are needed for the PCCBs.
09-30-2006, 07:36 AM
#17
Miserable Old Bastard
Rennlist Member
Rennlist Member
Interesting stuff. I do know the rears are HUGE - sort of astonishing when you get them off and look closely at them.
Dan - did we get the wheel hangers with our PCCB cars? Fortunately never had to use them but not even sure I have them (if I don't, I need to order a set).
Dan - did we get the wheel hangers with our PCCB cars? Fortunately never had to use them but not even sure I have them (if I don't, I need to order a set).
09-30-2006, 08:47 AM
#18
Rennlist Member
I'm with MC on this one. My first mod was Champion forged wheels which at 18.5/19.5 saved me a minimum of 18 lbs all around from my 987 sized 19s.
The dynamic difference was subtle but noticeable...equal to having my girlfriend (107 lbs) leave the car before a spirited drive (which she tends to do ???)
I also went light on options to keep weight reasonable. At only 280 hp I need all the help I can get!
The dynamic difference was subtle but noticeable...equal to having my girlfriend (107 lbs) leave the car before a spirited drive (which she tends to do ???)
I also went light on options to keep weight reasonable. At only 280 hp I need all the help I can get!
09-30-2006, 09:57 AM
#19
Rennlist Member
Originally Posted by Edgy01
I apologise for the bad data that I put out earlier. I finally found my notes and have attached a couple of pictures to show the growth of these wheels over the years. The late wheels are the XRR rims (rear, 11.5 x 19 inches) contrasted with one from the 1980s,--a Fuchs forged 8x16 inch rim. The front, mounted XRRs weighed in at 49.5 to 50 lbs a piece. The rears at 62.5 to 63 lbs a piece.
Recall the wheels, alone, are as follows:
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
(Contrast this with the 7x16 and 8x16 Fuchs forged rims at approximately 15 lbs each).
The final shot is of the mandatory wheel hangers needed to aim the dismount and mounting of these wheels onto the car without risking damage to the ceramic brake rotors. One is a pretty good idea for the regular brakes and two are needed for the PCCBs.
Recall the wheels, alone, are as follows:
8.5x19" 24 lbs. 2 oz.
11.5x19" 29 lbs. 4 oz.
(Contrast this with the 7x16 and 8x16 Fuchs forged rims at approximately 15 lbs each).
The final shot is of the mandatory wheel hangers needed to aim the dismount and mounting of these wheels onto the car without risking damage to the ceramic brake rotors. One is a pretty good idea for the regular brakes and two are needed for the PCCBs.
09-30-2006, 12:45 PM
#20
Rennlist Member
On Chris's note, I had heavy italian 18's on my DE car, and when I got fed up that they weighed 50 lbs on each corner and went back to my lightweight 17's, I was really surprised by how noticeable the stopping and accelerating benefits were. I think it overwhelmed whatever harder spring rate the smaller sidewalls in the 18's benefited.
I kind of don't see the point about 19's and larger, although they do look tres cool on our 997.
I kind of don't see the point about 19's and larger, although they do look tres cool on our 997.
09-30-2006, 08:53 PM
#21
1st Gear
Join Date: Nov 2001
Location: Pennsylvania, USA
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Regarding the multiplier for rotational vs. static mass, this guy does a pretty convincing job of demonstrating that it is less than 2:1 -
http://forums.audiworld.com/s4/msgs/1032814.phtml
http://forums.audiworld.com/s4/msgs/1032814.phtml
09-30-2006, 09:42 PM
#22
Rennlist Member
Dan -
Nice pic of the ceramics...now can you post one of them when they're glowing orange?
As for your original post,....I gotta agree, lifting those rear wheels is a serious chore...I'll be doing it again soon enough when I put the snow shoes on.
Nice pic of the ceramics...now can you post one of them when they're glowing orange?
As for your original post,....I gotta agree, lifting those rear wheels is a serious chore...I'll be doing it again soon enough when I put the snow shoes on.
09-30-2006, 10:45 PM
#24
Originally Posted by Edgy01
Thee PCCB option on the 997/997S probably is the same as the late 996-based GT3s but with the second generation rotors. (They carry a 996 part number).
Your wheel research is excellent,--your weights are getting down to the older (and much smaller) forged Fuchs aluminum alloy wheels of yesteryear.
Your wheel research is excellent,--your weights are getting down to the older (and much smaller) forged Fuchs aluminum alloy wheels of yesteryear.
MC
10-01-2006, 01:09 AM
#27
Poseur
Rennlist Member
Rennlist Member
Thread Starter
Originally Posted by jcnesq
Interesting stuff. I do know the rears are HUGE - sort of astonishing when you get them off and look closely at them.
Dan - did we get the wheel hangers with our PCCB cars? Fortunately never had to use them but not even sure I have them (if I don't, I need to order a set).
Dan - did we get the wheel hangers with our PCCB cars? Fortunately never had to use them but not even sure I have them (if I don't, I need to order a set).
As with Porsche these days, nothing comes for free (hardly). You will have to order a couple of the hangers for your car. Since these things are CRITICAL if you have the PCCBs I highly recommend that they stay in the car when you are not actively using them yourself in your garage. I got two and put them inside the existing tool kit carrier. There is actually room in there beneath where that cheap plastic carrier for the screw driver and wrench go. Pull that out and then slide one of these hangers in one at a time (each end to end like a couple of AA batteries) beneath that kit. They won't move around.
Apparently these were provided on the 996 cars but Porsche decided to cut back. You will want these in the event you are in some po-dunk garage somewhere that PORSCHE doesn't have a presence,--and you better (with the PCCBs) stay on top of whatever shop touches your car.
For Brett,--I concur,--the 19s, compared to the beautiful 16 inch Fuchs (which I considered the pinnicle of Porsche wheel technology (for the time) make the Fuchs look like little toys.
But, today, you don't want to have to man-handle these things at the side of the road yourself at 63 lbs.
