Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Lowering rear suspension without removing rear beam
Goto page 1, 2  Next
 
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades
View previous topic :: View next topic  
Author Message
nrwilliams  



Joined: 28 Sep 2009
Posts: 9
Location: East Sussex, UK

PostPosted: Sat May 29, 2010 12:03 am    Post subject: Lowering rear suspension without removing rear beam Reply with quote

Hello,

Quick question. If I were to cut holes in the rear cills of my car to allow the torsion bar cover to come through will this allow enough room for the ride height to be adjusted without removing the rear beam?

I saw a couple of 924 race cars last week which had holes in this location and I can only think it is for the above purpose.

Anyone think this sounds correct?

Thanks

Neil
Back to top
View user's profile Send private message
Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11373
Location: PacNW

PostPosted: Sat May 29, 2010 12:40 am    Post subject: Reply with quote

Hard to imagine the PITA level of doing that as less than dropping the carrier, if you are only doing it one time. I believe race guys might do it to experiment with different bars.

But it answer to your question, yes, that is why the holes are there.
_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
Back to top
View user's profile Send private message Visit poster's website
fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Sat May 29, 2010 2:03 am    Post subject: Reply with quote

There was an article from back in the day that talked about doing this.

They machined off the end of the torsion bar carrier, drilled and tapped the end of the torsion bars and then marked and cut a hole through the sill of the car using a hole saw I believe. The hole in the body was capped with a simple plug made from the removed bodywork and painted black and held in place with a bolt threaded into the end of the torsion bar.

To adjust ride height, pre-load, change torsion bars, etc the crew would simply need to raise the back of the car up, remove the plug, thread in the end of a slide hammer and gently use the hammer to remove the torsion bar, adjust the control arm position with a jack (or replace the bars) and put it all back together and back on the ground.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
Back to top
View user's profile Send private message Visit poster's website
Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11373
Location: PacNW

PostPosted: Sat May 29, 2010 2:34 am    Post subject: Reply with quote

fiat22turbo wrote:
They machined off the end of the torsion bar carrier.


Not the carrier. Called "strut" in PET (?), called spring plate by me.
_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
Back to top
View user's profile Send private message Visit poster's website
fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Sat May 29, 2010 2:43 am    Post subject: Reply with quote

Okay, just going from memory there, but it seemed that he magazine wonks called it a carrier.

Bottom line? Its the tube thingy that sticks out the side of the rear suspension and holds the end of the torsion bar.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
Back to top
View user's profile Send private message Visit poster's website
Carrera RSR  



Joined: 08 Jan 2010
Posts: 1778
Location: Somerset, UK

PostPosted: Sat May 29, 2010 7:51 am    Post subject: Reply with quote

EMC Motorsport here in the UK who specialise in 924/944/98 race cars cut a hole on my sill to allow easy re indexing of the the torsion bar after fitting my GAZ Gold coilovers. This allows quicker ride height adjustment for various tracks subject to the surface quality. Thankfully being a Turbo I have sill covers to hide the hole behind.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
Cédric  



Joined: 27 Aug 2004
Posts: 1870
Location: Sweden

PostPosted: Sat May 29, 2010 5:27 pm    Post subject: Reply with quote

For adjusting it feels pretty unnecessary, If you do some thinking ride heigth should be almost spot on when you change the bars. Then there is the adjustability in the spring plate which allows for plenty of adjustment easily done by turning an eccentric.
_________________
´80 924 Turbo
Back to top
View user's profile Send private message MSN Messenger
RC  



Joined: 25 Mar 2007
Posts: 2634
Location: Australia

PostPosted: Sun May 30, 2010 4:08 pm    Post subject: Reply with quote

Heaps easier to R&R or index TBs with the hole that Porsche put in the earlier cars.

Back to top
View user's profile Send private message
Captain_Kirk  



Joined: 17 Dec 2009
Posts: 243
Location: Colbert, WA

PostPosted: Thu Oct 07, 2010 3:52 am    Post subject: Reply with quote

Bringing up an old post here. I have searched and read every post here about reindexing my torsions bars and I am still left with some questions.
I want to lower the rear end just to level the car. I have a '77 NA (May of '76) and it has the holes in the rocker panels to pull out the spring plate just like in the pic above ^^^^ so I don't need to drop everything out of the car.
My car does not have the eccentric bolt so don't tell me to use that first. All I have are three bolts holding the spring plate to the hub, two of the bolts are holding the sway bar inplace. So where is the tension on the suspension? When I unbolt the spring plate from the hub will it want to rotate? Then do I slide it off the torsion bar, rotate it, then bolt it back up? Or do I unbolt the spring plate from the body first? Am I going to need spring compressors on the plate to hub connection to get it bolted back up?
I understand all the splines and degrees and all that so don't just send me to another link cause I've read them all and all seem to pertain to the next year and newer cars that have the eccentric bolt and more hardware holding them together.
I'm just trying to figure out where the actual tension is in the suspension so things don't come flying apart when undone.
Thanks in advance.
Captain
_________________
1977 924na BlackSeaRD.com Torque Tube SuperBearings, Xenon air dam, 200# Weltmeister springs, Bursch header, 944 exhaust, Audi throttle body
Back to top
View user's profile Send private message
Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11373
Location: PacNW

PostPosted: Thu Oct 07, 2010 5:09 am    Post subject: Reply with quote

You'll need to raise the car, remove the wheels, and support the trailing arms, maybe after raising them a tad, before unbolting the spring plate. If you want this process to take less than forever, I recommend a cheap angle finder from the hardware store.

As you probably figured out, because you don't have the adjustable spring plate to make fine adjustments to ride height if you are a bit off on one side, you will have to get it tits-on.

Try and rotate one tooth at a time (meaning, one inner tooth and one outer tooth at the same time). This is the finest adjustment possible.

Did you find the spreadsheet on the Spec944 website?
_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
Back to top
View user's profile Send private message Visit poster's website
fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Thu Oct 07, 2010 5:26 am    Post subject: Reply with quote

BTW, if you want to swap your rear arms out with the adjustable steel arms from my 79 and/or a set of stiffer 944 torsion bars. They're yours if you want them.

I'll give them to you for the cost of shipping. I'm down in Portland, so it shouldn't be too bad.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
Back to top
View user's profile Send private message Visit poster's website
Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11373
Location: PacNW

PostPosted: Thu Oct 07, 2010 5:58 am    Post subject: Reply with quote

^^^^^^^
No-brainer.
_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
Back to top
View user's profile Send private message Visit poster's website
Captain_Kirk  



Joined: 17 Dec 2009
Posts: 243
Location: Colbert, WA

PostPosted: Thu Oct 07, 2010 7:56 am    Post subject: Reply with quote

Quote:
Did you find the spreadsheet on the Spec944 website?

Whooosh. That's the sound of it going over my head. My wifes a math teacher (trig, calculus, algebra, geometry) finally I found something she can help me on the car with.
fiat22turbo: are the arms adjustable as in they have the eccentric bolt on them? Is that the arms your speaking of? Anything else needed to adapt them to a 4-lug drum set up? Shoot me a quote on shipping to 99212 business address.
I was hoping there would be an easy solution to just dropping the rear a bit. I've got some 15" wheels and 195/55-15 tires and there is alot of space showing in the wheel well.
Quote:
Try and rotate one tooth at a time (meaning, one inner tooth and one outer tooth at the same time). This is the finest adjustment possible.

Can I just rotate the spring plate or do I need to pull the torsion bar and rotate it? Can't the inner end of the torsion bar stay in place and just turn the spring plate or am I missing something.
Thanks.
_________________
1977 924na BlackSeaRD.com Torque Tube SuperBearings, Xenon air dam, 200# Weltmeister springs, Bursch header, 944 exhaust, Audi throttle body
Back to top
View user's profile Send private message
Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11373
Location: PacNW

PostPosted: Thu Oct 07, 2010 8:14 am    Post subject: Reply with quote

Captain_Kirk wrote:
Can I just rotate the spring plate or do I need to pull the torsion bar and rotate it?


No Cap'n! They can't stand the str-r-r-r-rain!

Captain_Kirk wrote:
Can't the inner end of the torsion bar stay in place and just turn the spring plate or am I missing something.


Aye, Cap'n, you'r-r-r-re missing the whole damn thing! One outer tooth'll dr-r-r-op ya more than two inches! Besides which pulling off the spr-r-r-ing plate without disengaging the inner-r-r-r splines is nigh on impossible!
_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
Back to top
View user's profile Send private message Visit poster's website
fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Thu Oct 07, 2010 8:21 am    Post subject: Reply with quote

Captain_Kirk wrote:
Quote:
Did you find the spreadsheet on the Spec944 website?

Whooosh. That's the sound of it going over my head. My wifes a math teacher (trig, calculus, algebra, geometry) finally I found something she can help me on the car with.

fiat22turbo: are the arms adjustable as in they have the eccentric bolt on them? Is that the arms your speaking of? Anything else needed to adapt them to a 4-lug drum set up? Shoot me a quote on shipping to 99212 business address.
I was hoping there would be an easy solution to just dropping the rear a bit. I've got some 15" wheels and 195/55-15 tires and there is alot of space showing in the wheel well.




The arms are from a slightly later 4-lug car and still have the drums attached.

They have the eccentric bolts to fine tune the ride height.

You need the spring plates (meaning you get to reindex the torsion bars) and the trailing arms I believe. It should all bolt up like stock.

I know someone else in Portland that is selling the appropriate bits to convert your car to the 5-lug setup. You would need new wheels though.

The 944 torsion bars should be a nice upgrade for a relatively stock 924. You'll probably want to upgrade the front springs at some point though to help keep it better balanced along with swaybars, etc.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades All times are GMT + 10 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group