21/29's-- any on running?

[911st]

I know 21/29's are not a recommend standard and are more rear biased.

I have a 85 3.2 Carrera around 2700 lbs with LSD for street/DE.

Is anyone running this set up or close to it (22/30 or 31's)?
What do you like about it ?
How is it working on the track or street?
What sways are you running with them?

Unless you have tried it please don't hammer me.

Thank you for any input.

[jester911]

I have 23/30s and Elephant bushings and LSD. I still have the stock sways for now. I also had it corner balanced and aligned. My setup is great for now. I have had it on the track 2 weekends and I am still catching up to the car.

It can be a tad harsh on the street depending on how bad your roads are.
I think it is just as important what bushings you run as the size of torsion bars.

[175K911]

Originally Posted by 911st

I know 21/29's are not a recommend standard and are more rear biased.

I have a 85 3.2 Carrera around 2700 lbs with LSD for street/DE.

Is anyone running this set up or close to it (22/30 or 31's)?
What do you like about it ?
How is it working on the track or street?
What sways are you running with them?

Unless you have tried it please don't hammer me.

Thank you for any input.

On my old '86, I tried the 21/29 combination and it was too loose for my taste. I had adjustable 22 mm sway bars and ended up running the front full stiff to balance out the car on high speed turns at places like the Glen. Swapped out the 21 for 22's and was much happier. Drove that combination extensively on the street too and it was very comfortable.

Current setup on this 86 is 23/31 with Tarett sways and Elephant polybronze everywhere. Custom valved Bilsteins to match the torsion bars. Wonderful on the track but marginal ride comfort on the street.

FWIW- before the 21/29, I ran 21/28 which was a nice combination with the stock 86 sways (which were bigger than your 85 sways.) But not enough roll stiffness for track duty to justify the work to swap it all out.

My recommendation is just do the 22/29. But either way, you'll need shocks to control the added stiffness of the torsion bars.

[JP911]

I've got 22/29s with late Carrera sways on my 74 and it's a nice compromise between street and track. Not too stiff for the street and pretty neutral on the track. However, having recently driven an SC race car with 24/31 torsion bars and 31/31 adjustable sways, I can tell you that my setup is FAR from ideal for a track car. My 911 felt like a Cadillac afterwards.

[ChrisBennet]

22/29's love em.
-Chris

[88 Club Sport]

My SCarrera is set up for DE's and spirited mountain blasts. It probably weighs 2650 or so. When I put it together, I went with:

22/29's
Poly bushings up front and Neatrix in the rear
Carrera sways 22/21mm
Bilstein sports

It handled good but I was not convinced it was the best for the intended use. I then went with:

23/31's
Poly bushings all around with zerks
Tarrett adjustable sways
Bilstein sports revalved for the bars etc by Bilstein

It handles great on the track and for fun rides but I would not want to daily drive it.

Check out this thread:22/28 vs. 22/30

[ted]

Originally Posted by 911st

I know 21/29's are not a recommend standard and are more rear biased.

I have a 85 3.2 Carrera around 2700 lbs with LSD for street/DE.

Is anyone running this set up or close to it (22/30 or 31's)?
What do you like about it ?
How is it working on the track or street?
What sways are you running with them?

My experiances were about the same as 88CS.

On street tires you might be OK.
Mine had 21/30 on a 2200lb early 911 with a 3.2, R rated tires.
Handled great at the track, almost too stiff for hour long freeway drives.

Increased spring rates also benefit greatly from custom valved shocks.

With higher traction DOT R rated tires with your weight car I would expect you would start to feel a bit of pitch and roll through high speed sweepers and during direction change transitions.

I'd say on the street your combo is about the best compromise you can make for a very track-able ride and still streetable.

I like adjustable Sway bars on the small side.
Optimize your handling with springs and shocks first.

[KTL]

I had 22/29 with HD front, Sport rear Bilsteins and stock front sway, Welt adj. 22mm rear, rubber bushings all around. Handled well at the track but I was not happy with body roll. Very nice combo for a car that you like to drive on the street and take to the track.

I don't drive mine on the street much and would like more out of the car. With the 22/29 combo, factory-equipped cars did not struggle to keep up with me. Currently working on 24/33 or 23/31 depending on availability. I'm sure it'll end up 23/31. Shock tuning is the key to avoiding harshness. Those who revalve can attest to this, plus it's simply the correct way to set your car up- dampers need to match spring rates.

Seems to me the best bet is single adjustable Koni yellows- document your settings to dial it in, then soften them up to drive home.

[don911]

22/30 hollows, RSR struts/shocks valved to match, #27 SRP adj sways, elephant bushings

Love the set up. Great for both street and track. Much better rotation than 22/28 but no tail happy. Easy to drive on the track

[Jeff Alton]

Don, glad you are still happy with the set up!!!

The 21/29 set up on a 915 car is good for someone who like a car that rotates. I would normally suggest 22/29 on that car for someone with your needs. For a G50 car, I usually go 22/30 like for Don.

That said, I have done another 22/30 G50 car where the owner finds it too tail happy. It all depends on your driving style and how YOU like a car to feel. Starting with 22/28 as the old standbye suggestions, you end up with a car that has the same balance as stock. Decide from there if you want to increase the rear rate, decrease the front rate, or keep the balance to get what you want for your money.

I personally like more rear spring rate, but to some, that can create a car that feels tail happy to them. To me , Don's set up is great, to others, not so much.

Figure out what you like/want and adjust the sizes to suit!

Cheers

[911st]

Thank you to everyone.

If 22/29's are not faster by much than a properly driven stock suspension car I may consider just freshing my bushings, hd/sports, and updating to 86 specs (stiffer rear torsion & sways). This lets me stay back a class at the DE's.

I am leaning toward the 22/29's -w- HD/sports. However, it sounds like this is a lesser of suspension possibilities and others will be running much stiffer $etups. I still want to street my car.

I guess, still thinking what to do but the rear bias 21/29 combo is out.

[RoninLB]

I learned a lot

[Rusty Heap]

22/28mm t-bars in the car last weekend.

front revalved struts from Rennsport systems in portland, billstien sport shocks in back.

Just got the car back on the road, it's a whole new beast, point it and it goes, Steve at Rennsport has valving set soft-medium on compression, and firm on rebound, so the shock takes a set and stays firm.

I like it, first Autocross in 1 week, I can't wait.

[KTL]

I'm a rather conservative driver, so I don't think i'm a good gauge for comparing a stock car to my car with 22/29. The 22/29 is clearly an improvement just in feel alone. The car is much more solid-feeling with the bigger t-bars. I think my car with the right shocks and sway bars would be hard for a stock car to catch. It's all a system- tuning is key to getting the most out of it. Plus some balls (for me) would help too.

[KFC911]

+1 for the 22/29 with Bilstein HD/Sport combination.

[911st]

I think 22's are about 90% stiffer than stock in front. (21/27's are about 57% each)

28's are about 80% stiffer and 29's are about 108% stiffer or about a 14% difference on the total.

Thus, the choice between the two might more be about how one wants the car to handle than total stiffness.

Dose any one know the ideal spring rates to match the valving of the Bilstein shock HD's and Sport's out of the box?

[85eurocarrera]

Originally Posted by 911st

Dose any one know the ideal spring rates to match the valving of the Bilstein shock HD's and Sport's out of the box?

Good question. I just put in 21/27 with revalved Bilstiens in my 2800lb carrera. I have a 101 miles on them and all I can say is WOW. I just need to get it alligned before I chew up my tires. Even with it out of allignment it seems way more fun to drive.