![]() |
|
|
|
Je Ne Sais Quoi = Targa
|
Alignment question
According to my '82 SC owners manual, camber should be straight up for the rear wheels and very slightly positive for the front wheels, most of the P-cars out there seem to using negative camber, at least for the rear, is the factory info obsolete, or the optimum for long tire life, or....?
__________________
'74 Targa lightweight widebody, 3.6 motor, big bars, Speedlines, Sold 2018, '81 SC Targa with 3.2 spoilers, Webers, SSIs, 7&8X16 Fuchs, 911R style exhaust, Had a '71 911S Targa in the 80's, miss it, Had a '61 Roadster in the 70's, miss it also, |
||
![]() |
|
Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
|
My vote is optimum tire life. also tires have improved alot in 30 yrs. I have alwqys run a little neg camber up front and about 1/2 deg more neg at the rear.
__________________
1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 |
||
![]() |
|
Wash. State
Join Date: Jun 2006
Posts: 3,569
|
I'm not sure all drivers can tell the diff. on the street, the track is another story. Regardless, neg. camber at the rear will wear the tires; can't rotate, obviously, but if you drive only several thousand miles a year, you will have better handling, and new tires every five years+? Not too big a deal, I guess. I'm at -1 degree, and I see the wear...........but again, over 4 years plus, not a big thing. Once had a guy tell me that with "straight up" the car would feel, quoting here, "...squirrelly as Hell". I have to question that, for "normal" street driving.
|
||
![]() |
|
PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
|
That spec is for when the ride heights were raised in the U.S. to meet bumper height regulations. These cars also had a thick spacer between the upper strut mount, and the top of the strut dust cover.
For the normal ride height it was 0 degrees front, and -.5 rear. Most cars are well below either of these ride heights, so it is usually impossible to achieve these settings at the usual ride heights. (In the front anyway. The rear has a greater range of adjustment.) A more typical street setting is -.5 front, and -1.0 rear.
__________________
'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
||
![]() |
|
Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
|
Tyson is spot-on.
You do NOT want positive camber on these cars otherwise you will become aquainted with your local bodyshop on a first-name basis.
__________________
Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
||
![]() |
|
Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
|
Quote:
What other factory settings should we be concerned about? |
||
![]() |
|
![]() |
Banned
Join Date: Sep 2010
Posts: 5
|
My vote is optimum tire life. also tires have improved alot in 30 yrs.
|
||
![]() |
|
Registered
|
Just to add to this, how about caster setting for the front for street use? 6 deg sound right?
__________________
1983 911 SC 2015 Volks GTI 1991 Volks GTI 2011 Nissan Juke 1992 Nissan NX 2000 |
||
![]() |
|
Registered
Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
|
Steve and Tyson are giving good advice.
I run an additional .2 to .4 neg camber front and rear for AX and track, no noticable odd wear for street driving. |
||
![]() |
|
Je Ne Sais Quoi = Targa
|
Thanks for all the input guys, I have been a fan of negative camber since 356 days, but now I am also noticing in our host's book, "101 Projects for Your Porsche 911", on page 153, he states that the 911 camber should be "0" with a slight positive emphasis, about 1/6th of a degree,
Curious....
__________________
'74 Targa lightweight widebody, 3.6 motor, big bars, Speedlines, Sold 2018, '81 SC Targa with 3.2 spoilers, Webers, SSIs, 7&8X16 Fuchs, 911R style exhaust, Had a '71 911S Targa in the 80's, miss it, Had a '61 Roadster in the 70's, miss it also, |
||
![]() |
|
Max Sluiter
|
Really?
![]() ![]()
__________________
1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
||
![]() |
|
Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
|
The factory spec calling for a slight pos camber is probably chosen to reduce what is called "camber thrust". This minimizes wander and following of ruts in the road. It may improve road manners but won,t produce max cornering force. That will improve with neg camber, at the expense of road manners in a straight line and tire mileage.
__________________
1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 Last edited by johnsjmc; 10-06-2010 at 03:15 PM.. |
||
![]() |
|
![]() |
abides.
|
With basically stock suspension I run settings that are close to what Tyson wrote. I generally get very even treadwear.
__________________
Graham 1984 Carrera Targa |
||
![]() |
|
Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
|
Quote:
I don't think that tire wear was the issue when you mentioned being aquainted with your bodyshop. |
||
![]() |
|