dillon410021

When I rebuild my car over the summer I want to upgrade the suspension. My rear suspension has the torsion bars and I would like to update it to coilovers. Will this just bolt up or does it require special tools and custom fitting. Did the turbos come with coilovers in the rear? Where is the CHEAPEST place to buy coilovers and lowering springs?

SoloRacer

Ground Control

http://www.ground-control-store.com/.../II=749/CA=159

Or were you looking for a particular brand? If so, it might help to tell us what you are looking for.

To answer your question, the turbo's also have torsion bars. Why do you want replace the torsion bars?

dillon410021

Will replacing the torsion bars improve rear suspension and body sway? Would replacing the struts have a big impact?

schwank

Your second question should have been your first.

If you have high mileage, for sure the shocks will help. You may find there is no reason to spring for coilovers which will run you $1000 more than just rear shocks.

Depends on your goals.

333pg333

Replacing the t-bars won't have any effect on the body sway really. You can go to stiffer t-bars of course. What about your sway bars, what ones do you have on the car now? Do you have the stock suspension on the car now and just want to make it corner flatter? That's easy enough without taking out the t-bars. Unless you want to change over the rear coils on a regular basis because you race at a whole bunch of different tracks and have recorded what springs suit which course, then what you want to do is overkill. Look at the pics of my car in the thread on the front page now titled 'Pictures of the car at speed'. This is pushing through an off camber corner hard in 3rd gear. Doesn't look like it does it. I've got stock t-bars in my car. You can upgrade your suspension to handle very well without taking out the t-bars IMHO.

dillon410021

The car has the original struts in the rear and the stock sway bar. What company of shocks works the best for the money? Will a front strut brace help a lot?

HansB

I am still not clear what you are looking for.

I agree with Patrick, there is no structural advantage to coil-overs over T-Bars. A spring rate is a spring rate

Rear coilovers have the main advantage that it is easier to adjust height, so makes the job of corner balancing easier. Corner balance is one of the major factors in understeer/oversteer and turn-in behaviour.

Along with that there is a bigger range of spring rates that you could use, because there is a wider choice in coil-over springs than in T-bars.

Body roll is best reduced with sway bars. If you feel you have got to much body roll rear (how do you know?) a thicker sway bar will help. Too stiff and you will increase oversteer.

A strut brace will stiffen up the front end, and keep the camber more constant wile cornering, and as such improve the front grip.

All new shocks are better than old worn shocks. Koni and Bilstein work fine on Porsches, as I am sure many others will too

333pg333

There is so much info using 'search' to find all sort of opinions as what is the best upgrade suspension package out there. Not sure what's the cheapest though?

Bltzkrg

So if you keep the torsion bars in the rear and run a coil over setup, how much of a spring rate would you suggest running for the track? Let's say I was to get 250lbs rear springs, that would bring the grand total of the rear to what?

mj951

this link will get you started, but be warned you have hours of research to do and a lot of opinions (all valid) to sift through when looking at suspension modifications.

http://www.asco96.dsl.pipex.com/944t/suspension.htm

dillon410021

is it possible to lower the rear of the car if it has torsion bars?

333pg333

There's a formula you need to use for figure out the combined rates of the springs and t-bar to arrive at your effective wheel rate in lb/in. I'll dig it up from when Karl from Racers Edge figured out mine.

333pg333

PITA but yes. Take it to someone who knows what they're doing. Then it becomes their PITA

Bltzkrg

Those of you that do have upgraded the rear suspension, do you keep the rear rate equivalent to the front? Or do you run a slightly higher rate in the rear?

CP944T

Just changed my susp to 250# Welt springs in front, 27mm tbars rear (220#), so should be pretty balanced and comfortable on street w/ a decent upgrade from stock for DE. I also run Koni yellows all-around. I'll have to play with the rebound settings some as I'm getting used to this car. I'm also installing a 22mm Welt adjustable rear swaybar and a M030 30mm hollow front swaybar, hopefully receiving from Paragon this week :-)

Changing the tbars was a pretty big job. Definitely helped to have a 911 guy helping me index the new bars. It is possible to get about 1" of rear height adjustment using the eccentric bolt on the spring plate.