![]() |
Just for completeness sake I checked the factory specs for front track w/ the same 7ET55 & 205/50 x17 setup
964 1374mm 993 1405 mm difference 15.5mm per side, all of which appears to be in the longitudinals and the mounting holes are 30mm apart |
Quote:
Also 993 rotors space wheel a bit wider. I found out that Fuchs wheels can not clear 993 caliper without rotor mounted (scared the @#$%^ out of me when I tried wheels on the bare hub before I realized:) Next time I get around I'll measure outer rotor wall thickness for 993 and 964 rotors. Oleg. |
Quote:
W/ 993 rotors you use 993 wheel carriers or w/ 964 wheel carriers a caliper adapter w/ their o/s here's the difference between a 964 322 and a 993 322 http://forums.pelicanparts.com/uploa...1391021209.jpg |
Got around to look at rotors. Wall thickness is same, 993 hat is about 10mm shorter.
https://dl.dropboxusercontent.com/u/...d/IMG_1347.jpg https://dl.dropboxusercontent.com/u/...d/IMG_1349.jpg So looks like longitudinals are major contributor to track change. I may measure uprights... Also, I can not find 964 RS track width spec anywhere, Bill do you have any reference for it? Thanks! Oleg. |
That looks to ba a 964 28x298 rotor on the right, What rotor is on the left?
https://dl.dropboxusercontent.com/u/...d/IMG_1347.jpg When comparing 964RS/t 322x32 to 993 322x32 I think that the height difference was ~5mm 964RS came w/ 7.5x17ET55 & 9x17ET55 wheels 205/50 & 255/40 tires, factory spec for track is 1379/1380mm 964 base wheels were 6ET52 & 7ET55 wheels 205/55 & 225/50 x16 tires, factory spec track is 1380/1374mm 964 option was 7ET55 & 9ET55 wheels, 205/50 & 255/40 x17 tires, factory spec track is 1374/1374mm 993 base 7ET55 & 9ET70 wheels 205/55 & 245/45 x16 tires, factory spec track is 1405/1444mm 993 option was 7ET55 & 9ET70 wheels, 205/50 & 255/40 x17 tires, factory spec track is 1405/1474mm, rear also used 9x17ET55, I believe that the 9ET70 used a spacer but I've never seen those wheels so don't know for sure the spec is for the 9ET55 wheel 993RS was 8ET52 & 10ET65 wheels 225/40 & 265/35 x18 tires, 1413/1452mm |
Quote:
One thing that I want to understand - why factory rolled fenders on RS? It did used 964 turbo wheel carriers and unique upper strut mounts but other suspension pieces were practically 964 parts mounted in NB configuration. Before switching to this new suspension, I had my car with stock 964 parts & 7.5et55 front wheels at much lower than RS setting and never had problems with lips ... I had bump steer and tire rubbing inner fender issues, but no lips issues. PS. After move to CA all my books and old reference mags/docs are still boxed up.. |
Quote:
My guess is that they were prepping the cars to almost Cup specs, as they also flattened the oil line. These are both steps that allow the use of 8 & 9.5" wheels on the Cups |
Great thread! Thanks for all the info.
|
Does anyone know the difference between the regular (99334101700) wishbones and the Carrera RS wishbones(99334101780) ?
Tks P |
Quote:
If anyone has info on the track of the 3.8RS 964 I would be interested. |
Quote:
option was the Cup 1 7ET55 x17 w/ 205/50 tires and 8ET52 x17 w/ 255/40 tire, this was used w/ M1(steering stop) and M2(bumper edge) mods RSA used the same 17s as above 964 RS used 7.5ET55 w/205/55 x17 tires and 9ET55 w/255/40 x17 tires 964Cup used 8ET52 w/ 235/40 x17 tiresa and 9.5ET47 w/ 275/40 x17 tires for '93 this was changed to 18 w/ the same ET not sure what tires 3.8RS street used 9ET48 and 11 ET5 wheels, I'd need to dig some to find the tire specs |
Nice suspension setup in this thread!!!!very informative.
|
Few updates to this thread.
Wheel studs Here’s list of some Porsche wheel studs, diameter 14.70mm 40mm 901 341 671 01 Standard 964 45mm 904 341 671 00 Standard 994 < 94 45mm 993 331 671 01 50mm 928 341 671 01 Standard 928, Standard 993 > 94 50mm 928 341 671 02 Standard 928, Standard 964 Turbo 52mm 901 331 671 00 65mm 911 331 671 00 72mm 901 331 671 01 For S rear with 21mm spacer Here are common Porsche wheel studs. I have (new) Fuchs wheels and use 12mm spacers at rear. Standard 964 or 993 studs have not enough thread: https://dl.dropboxusercontent.com/u/...n/IMG_1084.jpg I ended up ordering set of 65mm 911 331 671 00 studs that have best fit: https://dl.dropboxusercontent.com/u/...n/IMG_1256.jpg https://dl.dropboxusercontent.com/u/...n/IMG_1255.jpg To remove studs, do not use hammer, press them out. To press in 65mm studs hand brakes needs to be partially disassembled: https://dl.dropboxusercontent.com/u/...n/IMG_1252.jpg https://dl.dropboxusercontent.com/u/...n/IMG_1259.jpg Car with spacers (needs wash:) https://dl.dropboxusercontent.com/u/...n/IMG_1305.jpg |
Rear spring plates My rubber rear spring booths been cracked: https://dl.dropboxusercontent.com/u/...n/IMG_0550.jpg They are reasonably easy to remove: https://dl.dropboxusercontent.com/u/...n/IMG_0551.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0553.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0556.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0559.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0560.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0566.jpg At this moment one can install Elephant racing bushings. |
Rear spring plates continued I ordered 935 style plates. They look like they may provide independent toe and camber alignment (I was wrong - see later) https://dl.dropboxusercontent.com/u/...n/IMG_0993.jpg They also turned to be thinner than stock, so Weissach effect is probably a bit increased, but also they have welded in bolt section which should make them a bit less flexible. I'm not sure if they decrease or increase Weissach effect (no matter what advertisements say) https://dl.dropboxusercontent.com/u/...n/IMG_0996.jpg https://dl.dropboxusercontent.com/u/...n/IMG_0997.jpg Need also rubber rod ends, otherwise ball joint won't last long: https://dl.dropboxusercontent.com/u/...n/IMG_0998.jpg Need also rubber rod ends, otherwise ball bearing won't last long. Putting them on is ROYAL PITA :o, REALLY: https://dl.dropboxusercontent.com/u/...n/IMG_1001.jpg Now, there's widely discussed topic on what side to put slotted hole. 1st time I put it down. I had hard time getting rear toe to 0, it was always way in. After I flipped them and put slotted hole on top I was able to get toe right and had up to about 3.5 deg freedom in camber. Note. Adjusting toe screw WILL change your camber, so alignment takes about as long as regular 964 plates. https://dl.dropboxusercontent.com/u/...n/IMG_1276.jpg Putting rear suspension in the car without engine is real pleasure! https://dl.dropboxusercontent.com/u/...n/IMG_1002.jpg https://dl.dropboxusercontent.com/u/...n/IMG_1005.jpg |
Yes, with the slotted hole at the bottom I maxed out at -1.2 rear camber. When I put the slotted hole at the top I could get up to -3.0 rear camber. I set it at -2.0 when aligned.
Regarding Weissach effect, I believe that comes from the rubber in the OE spring plate bushing. The 935-style with the monoball and no rubber will not deflect under braking because no rubber components, so Weissach effect is eliminated. The rear axle feels much more stable and predictable, especially when over the limit and over the limit in transitions, than with the old OE spring plates. It's a great upgrade. |
Quote:
https://dl.dropboxusercontent.com/u/...ension/pf1.jpg On RS they used special spring plates (somebody can measure them please?) and modified bushing, here's page from RS broshure: https://dl.dropboxusercontent.com/u/...on/rs-susp.jpg Quote:
|
Wow....! I hadn't run across this thread before, the compilation of info is amazing. Cheers
|
Is the metal of the spring plate really designed to flex?
The Weissach-effect is suppose to add toe-in under braking. Let's assume the spring plate member is supposed to flex. Any flexing of the metal of the spring plate wouldn't add toe-in because that member is never longer than when it is perfectly straight. And flexing would shorten the length of the member and reduce toe-in. The RS-spec bushing is the outer bushing in the cast trailing arm. This RS arm (Porsche never sold the bushing by itself) is NLA and that's why Ninemeister worked with Powerflex to engineer their poly bushing kit for the rear trailing arm to mimic the stiffness of the RS piece. |
Quote:
Here's description from same book: https://dl.dropboxusercontent.com/u/...ension/pf2.jpg and here's enlarged piece of previous page with comments https://dl.dropboxusercontent.com/u/...sion/pf1_1.jpg I think as time went by that design turned to be less liked by enthusiasts. But I think 964 fans are lucky to be spared from 993 rear which has it's own problems that are not easy to deal with. I agree, full solution will be to redo bushings, there are few models available. Well - leave me topics to cover here in this thread:) |
All times are GMT -8. The time now is 08:22 PM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website