Sway-bar sizing for rear

I'm looking to put new sway bars on my '70 911T. It doesn't have one on the rear right now, but it has the small original on front.
I was trying to decide what size to put on the front, either 19 or 21 weltmeister. It is going to be for street and track.
The fronts are not a problem. There seems to be no recommendations for the rear. So, if anyone has any experience with the different sizes for the rear, I would be happy to hear from you.
Also, my rear end is a little heavier than stock. I put in a 3.0 from an SC.
Thanks Ed

Ed,

The factory engineers seem to like equally-sized bars at both ends, and as I currently have 19 mm bars at both ends that work quite well, those Stuttgart elves must know what they are doing! Don't forget that you will need the adapter kit to install the rear bar!

If the track use you contemplate is at true race tracks, you may want to go with the 22 mm bars front and rear, other wise 19 mm bars will probably suffice, including autocrosses. You may want to go with heavier rear torsion bars, such as 26-28 mm, and the adjustable Sway-A-Way adjustable swing arms are nice, too!.

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Warren Hall
1973 911S Targa

I just put 22mm bars front and rear on my 73 T. I have Weltmeisters in back, and AJ-USA's through-the-body replacement in the front. If you get adjustable bars, then I don't think you have to worry too much about it being too harsh. I have my rears already set to full stiff, and the car rides fine (passes the CD player test). The nice thing about these is that you can easily soften them up -- or even remove the links completely if you need to take the wife and baby on a cross-country trip.

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Jack Olsen
1973 911 T sunroof coupe

I had Weltmeister 22s on my '73T widebody. Very happy with them. The car was 100% street. The torsion bars were left stock so the ride wasn't harsh.

After checking out recommendations from other track guys, I went with AJUSA front and rear setup, 22 and 19. Their sizes are a little different then the recommendation from Weltmeister due to the difference in hardware and materials. They seem to fall inbetween the Weltmeister and the expensive but very good Charlie Bars. Bruce A. recommends them in his book. Also, as Warren suggested, went with 22 and 29 Torsion bars and adjustable spring plates. The prices are getting better with the AJ's since the kit includes all the hardware and no add ons. They use splined ends rather than square.

For the early cars I agree with the recommendation to run equal sized bars front and rear. I had Weltmeister 19mm F/R bars on my 70 911 previously, and am "temporarily" back to running stock 15mm bars. (The front 19 is happily living on my 914 now.)

The Weltmeisters are nicely made for the price. Charlie bars and TRG's swaybars are nearly twice the price...nice if you need and/or can affort them. Weltmeister also has a "high end" line of blade-type adjustable bars now from what I recall.

The 19's are by no means unreasonable for the street. For aggressive street use or definitely autox/track cars I'd probably go 22mm. The improvement in roll resistance from either size compared to stock bars or no bars is very noticable.

IMHO 29mm rear bars are a bit stiff on an early car. I live rural and those bars would shake my car (and the wife)to death. I'm running 22mm front /26mm rear for torsion bars and they are a little stiff. Remember it's great to type and talk but how the car responds on the street/track is what the bottom line is. At least you have adjustable anti-sway bars so you can tune in the suspension. Ed, I am also running a 1983 SC motor. What do you have for shocks.

Randy Jones
1971 911

[This message has been edited by RLJ (edited 11-01-2000).]

Right now I have upgraded RSR struts with RSR bilstein inserts up front and Koni's in back(these will be changed to matching bilsteins shortly).