Porsche 911 Rear Spring Plate And Torsion Bars

We continue with our Porsche suspension series. In this lesson, we look at the spring plate bushings and the torsion bars. We have oversized torsion bars in this build, from 23 to 26mm. The ride height is set by the torsion bar to spring plate angle. We use an angle finder to accurately read the spring plate angle before, during, and after we have all the parts back together. The whole series of videos work together. We have to do a four-wheel alignment and test drive before we are happy with all of the work. Check in again for the alignment video, we use string!

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[SpankysHotRodsandCustoms]

Thanks for your help and advice. Building a 911 on my channel and your tips surely help.
-Spanky

[peterandkodiak]

A very comprehensive video with excellent content. Very well explained by a pro mechanic! Thank you.

[Mike_Z_Gamer]

By adjusting the spring plate would i be able to lower the passenger down by half and inch or would the max be reliastically a quarter inch in ride height drop ? My right passenger rear is 1 finger higher than all of the other corners
The tires are all equal tire pressure at 32 psi

[GarageBiljon]

I am currently rebuilding the rear suspension of my 924 and your video has really helped me to understand the reindexing of the torsion bars.

[.Carrera]

Thanks for this one as well Kurt. I did this! My car is an '89 so the torsion bar hole in the bodywork has that notch on the bottom so I could take the entire assembly out as one piece and then use a mallet to separate the spring plate and bar. Everything went back together just as you said and I got to see exactly the effect on the inner and outer torsion bar splines to the spring plate angle. These engineers thought of everything. These cars are amazing and I love how things like this are achievable. I've already been studying your alignment video and I thanked you in advance there as well. A side benefit after doing this is to turn the eccentrics for the rear toe and camber for fun to get familiar with what they do to the rear wheel alignment before tackling that project. Thanks again.

[x.x..x.x]

This was such a wonderful video. Thank you for doing this for the Porsche community.

[johnfreeman]

Such valuable information.
Thanks for your expertise and also have to give credit to the person behind the camera. Great work!

[saqibnawaz]

Vry wonderful extraction of torsion plate bushing & adjusting measurements of new torsion bars on customer's request to raise ride height of porsche 911 cuz porsche can & hav to navigate bit rough terrain one vry lucky customer under unparalleled porsche's expertise of klassicAutomotive Training school

[Petrolhead]

Maybe this will help someone going forward, just today October 24 ive done the same job.
I found that the end cap at the outer end of the spring plate (spline end ) can be knocked out once the plates are off the car, the new caps can be purchased from Buttys Bits in the uk.
Removal of the cap allows better access to the splines for cleaning greasing etc, plus you can also mark the position on the end of the torsion bar and corresponding position on the spring plate cover, this makes it easier to see how many splines you move on the outer.
Thanks again kurt

[PApilot]

Fantastic video..thanks so much. Really helped me !

[anesennaidoo]

Such an excellent video / tutorial. Thank you

[r.m.]

As someone just getting to learn more about the ins and outs of these cars, I really appreciate how you laid out the video. Gives me confidence to start tackling work on my car. Was wondering if you could share your experience and any opinions you had regarding switching over from torsion bars to coil spring set ups in the rear for these G body cars. On the surface, it seems like adjusting ride height and spring rates would be a lot less time consuming/involved with coils.

[thomas]

Great video! As always from you! I would appreciate a video to see how you proceed to raise a 911 G body car in front and rear ride height without dismanteling the axles. Because most of 911s are way too low adjusted...This results in a poor driving comfort. Especially how you verify and adjust the wheel loads and the alignment in a pragmatic way for DIY...and how do you setup a perfect 911 for ambitioned dring on public roads? Stiffer torsion bars, thicker anti roll bars? Or do you prefer stiffer suspension?

[gordpower]

This is an excellent video. You said that the inner part was rotated 5 splines CCW. How many splines did you rotate the outer CW?

[David_Inc]

Good information but definitely counter to OEM bushing install which is done dry with bonded bushings. How do you find this differs in end result?

[bartvanrysselberge]

Hello, this is a very good film of how jou have to replace the suspancion . Can you help me i have a 912 from 1967 en and whant to replace the rear suspancion . But i don't now how much degrees the angel needs to be . Thanks Bart

[mrtoronto]

If I can ask a question, right at the 21:00min mark you can see corrosion around the hole. How long can you let it go before you need to send to the body shop as you mentioned earlier in the video? Can you put POR15 on that to help? Thank you for your videos.

[peterfrode]

Good video as usual. I have the same torsion bars. How much would you say you change the ride height in the fine adjustment for each 1 degree or 0.1 degree what ever is the more common way to tell?

[lawrenceevans]

Hi Kurt,
The bolt with the spacer...that has to be installed once the car is on the ground? Many thanks,
Lawrence

[FredBTs]

Probably a stupid question BUT if I zero my level inside the door why does the car need to perfectly level?