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Banned
Join Date: Feb 2002
Posts: 6,930
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how good does your car Turn?
hi
i am wondering if anyone here who has done suspension work can tell me what worked for you how do 911`s take to stiffer springs/shockes. did you set up your car for more overstear or understeer and how did it react to your mods i have a 71 911 T which i plan to autocross this summer i know setting up the handeling charistics of this car will take some trial and error but i am looking for a place to start i have the koni adjustables front and rear but i am unshure of what size torshion bars to get ect Thanks Kyle 71 911 |
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04-24-2002, 03:25 PM
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Registered
Join Date: Apr 2001
Location: Greenfield, IN
Posts: 412
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As light as your vehicle is, 21/27 torsion bars should be fine. Many ppl go 22/28 in the later SC's and Carreras. I went 21/27 because mine is a cab. I then went 22mm WM sway bars front and back. They are adjustable so you can dial in the understeer/oversteer and get close to a neutral balance. This is a good starting setup and will compliment your Koni's nicely.
Colby |
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04-24-2002, 04:36 PM
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Join Date: Aug 2001
Location: Chicago
Posts: 77
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I also have 21/27 torsion bars, 22mm Weltmeisters, and Koni Sport adjustable shocks. For me, it's noticable stiffer (I also changed to Yokohama A032R tires) but the handling improvement is impressive. There is lots of room for adjustment with the shocks and anti-roll bars. Right now I seem to have pretty neutral handling - I would adjust for more oversteer at autocross than on track.
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1972 911T Coupe |
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04-24-2002, 05:02 PM
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Too big to fail
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I'm running 22/29 t-bars, 23/22 sway bars, Bilstein 'Green' shocks, 7&9 Fuchs on a widebody car. I have TRG adjustable sway bars, set to about the middle of the adjustment. I'm running 205/50 and 245/40 RE730 tires for the street and Kumho V700 VictoRacers for the track.
At 'normal' speeds, ie on the street, my car is fairly neutral, but I can throttle-on oversteer at will. On the track, I have a wee bit of understeer at high speeds, which I counter with more throttle or more steering input. I have no immediate plans for further suspension work, other than maybe replacing the ball joints - that's the only piece I *haven't* replaced. I just bought a set of 17" track wheels today, 9's and 11's - that should be fun!
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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04-24-2002, 05:26 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,334
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Damn you, Fitpatrick! You've outflanked me on the wheels!
 To readers who are puzzled by my uncharacteristic outburst of competitive rage, see this thread.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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04-24-2002, 08:16 PM
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In addition to suspension, wheels and tires, lightening the pendulums(aka bumpers) at both ends of the car can have a dramatic effect on turn in on a later car. Jack wouldn't benefit much because the early bumpers were already pretty light.
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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04-24-2002, 08:24 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,334
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I already switched front and back to fiberglass.
Keeping myself on topic, I run 21/30 torsions and 22/22 antisways. The way you set your suspension up (camber/caster/toe) can make a big difference, too. In my case, having a fairly light car, with a fairly torquey motor, and an 80% limited slip, means my car pushes a lot in low speed tight turns. Aside from that, it's fairly predictable. Pelicanite Tyson Schmidt's been working his magic at TRE Automotive to get it to handle even better.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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04-24-2002, 08:34 PM
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Registered
Join Date: Apr 2001
Location: Greenfield, IN
Posts: 412
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Ok, so if reducing the weight of the front bumper is good for turn in, then I would think moving the battery farther back would be equally good. Yet few ppl do it, and many say it may negatively affect handling.
Also, if you reduce the weight on the ends of the car, and get better turn in, does that make the car less stable at high speeds in the straights? Is it a trade off (I believe toe or caster has this same effect). Colby |
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04-25-2002, 04:19 AM
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Join Date: Jan 2000
Posts: 6,950
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The most effective improvement if not already done in turning is plenty of negative camber, especially in autocross. You'll have much quicker turn in, along with darty highway driving, steering that requires both hands on the wheel and uneven tire wear.
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04-25-2002, 04:33 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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I noticed an significant increase in body roll after I had my car aligned with negative camber. I didn't want to go with stiffer bars all around to counteract the roll that the negative camber induced and make my already stiff suspension even more uncomfortable, so I set the camber back to stock.
I also did not care for the added push I experienced in slow turns with negative camber, not something I'd want in an autocross. Cheers, Joe Garcia 86 Carrera 92 Grand Caravan 86 Olds 98 |
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04-25-2002, 07:40 AM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
