Replace bushings
 

I have a 71' 911t Targa. My car feels nervous in speed, and it feels likes it want to turn over every second, kind off. I think my shocks are firm and OK, and I have adjusted the wheel alignment.

Maybe it's a good starting point to replace all bushings?

Someone know which bushings that should be replaced, complete list?
Which special tool is a must have for this?
How much will this run me?

push against the bumper, and shake the car side to side while looking at the rim. Repeat for each wheel. Bushings are not expensive, but the job will take a weekend per front/ back set.

First and easy, perform a visual inspection of the tires, check for foreign objects that could have caused a slow leak, and also check the manufacturing date. Old tires need to be replaced even if they have plenty of tread left.

As mentioned by Rusnak shake your car up and down and side to side, and listen for strange noises as you do so.
In all likeliness your bushings are shot anyway due to age, unless a PO had them replaced, so it would be a nice upgrade. While you are there check your rubber brake lines. Just watch out for that slippery slope...!;)

I have new tires and rims (Toyo P R888), and I have allready replaced all parts on the brakes: lines, mastercylinder, disc, tottaly restored calipers, pads and so on.

alignment can also cause the nervous or darty feeling (toe out). if you did alignment yourself I would have a shop check it. also check tie rod ends.

I notice you live in Norway and you are running R888's. How does the car feel after you've driven it for over a half hour? I have RA1's on my car and even when the temp was in the low 40's, it would take a while to get some heat into them, and until they were properly warmed up, the car felt very greasy. I've read that the R888's are much more difficult to get heat into compared to RA1's.

No problem with grip. I only use the car in the summer when warm. I even have no heating in my car. I have checked/adjusted the wheel alignment at shop. I think replacing bushings is a good idea. Soemone have complete list on what to order?

Here is a good starting point. Obviously you won't need everything on the list, and your budget will dictate which products you will choose.
For a strictly street application you won't need the polybronze, and ER offers quality rubber bushings that should work great for you.
Just beware... temptation is great on that site!:D

How many miles on the tires? And did the set of four go on at the same time or are you mixing 2 new tires with 2 older tires?

I ask, because new tires cause the car to feel darty for some miles. And mixing new with old will definitely cause some darty feeling until the new tires break in.

It's not the tires, for sure.
I know what darty tyres feel like, that is not the issue.
Thanks Zippy, I check it out.

That may be the case, but I've driven my car with totally worn out bushings and it didn't feel like it wanted to spin out all the time. It was choppy driving over bumps as if it had much stiffer torsion bars than it had. I think we are trying to help you solve your problem without spending a fortune on the car.

It sounds like you want to replace the bushings irregardless of whether they are the issue or not. Having said that, if your bushings are original, they are definitely worn out. I also suggest using the Elephant Racing rubber bushings. I used them on my car and the difference in ride quality and noise is out of this world. The fact that they are zero maintenance is icing on the cake.

I just want to replace the cheap bushings, if possible, and not spend a fortune. I know the issue is not the wheels because I have new rims and tyres. And before that I had normal "Rain Sport" tyres and different rims, and had exactly same issue. I have been driving pretty worn out tyres before, until they are ripped apart, and the cars have not felt like this. In my car , everything you can imagine has been worn out when I first got the car, so I am pretty sure also the bushings are worn out.

Day and night difference replacing the bushings.
Wouldn't hurt to check your shocks and possibly revalve them.

Verify these parts for your car:
99-3014-340-M230 - Front A-Arm bushing
PB-004 - Rear Spring Plate inner bushings
Looks like the same part number is used for the outer bushings
or get Neatrix for the rears ->PEL-PP909976

add maybe front and rear sway drop link bushings.
There is a foam washer that can be replaced on the control arm.

This is the closest to stock and the cheapest.

Look for install tips here (and videos elsewhere) - I did my fronts and they were a bear, but I am not a pro.

That's totally reasonable. Just want to exhaust all trouble shooting options. As others have said, just be careful of the slippery slope. Replacing the bushings is easy, it's the taking the entire suspension and brake system apart to take the old ones out that's tough. So it's very beneficial to be 100% confident in your upgrade goals in plans. Once you've taken the car apart, you aren't going to want to take it apart again, so it helps to get it all right the first time.

How are your tie rods ends? The inner ones have a rubber bushing which can fail, and even if they haven't yet, have to be fairly brittle. The "Turbo" tie rods are a good replacement.

When I got my '77 in 1985, one of the rubber bushes on the inner tie rod articulation was entirely missing, and the pivot was installed 90 degrees from where it should be. The tie rod needs to be free to move in an up and down, not front to rear, motion.

Front control arm bushing specs
 

Good to know