displaying posts 1 to 11 of 11

Author Subject: Differing torsion beam thickness?
Ben_W

Formerly gpm

Location: Lutterworth

Registered: 01 Sep 2007

Posts: 2,941

Status: Offline

Post #1
Been reading a little about beams etc as I'm looking at having the one off my Rallye to clean it up.....

What effect does changing the thickness of the torsion beam have? I'm assuming it alters the suspension rate, much like differing spring rates do on spring and strut set ups?

Why are the 21mm Xsara ones in demand?

Thanks

________________________________________

Cherry Red Rallye .... On going OEM spec resto

China Blue GTi6 .... Weekend toy

Black 208 GTi .... Wife's car now

Silver BMW 550i.... The executive missile

Posted 18th Jan 2015 at 17:09
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #2
you mean torsion bar not beam, beam is the name for the whole assembly

21mm are stiffer than 20 by about 20%

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Posted 18th Jan 2015 at 17:29
craig903

Regular

Location: whitstable

Registered: 08 Jul 2013

Posts: 273

Status: Offline

Post #3
every 1mm increase stiffens the rear beam at a rate off around 25%. I remember reading this somewhere. so maybe someone else can clarify it?

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208 GTI Owner
Turbo'd '6 project - work in progress
Posted 18th Jan 2015 at 17:30
clen666

Seasoned Pro

Location: Co. Durham

Registered: 12 Feb 2009

Posts: 2,401

Status: Offline

Post #4
20mm | 100% | 110lb (i.e. standard)
21mm | 122% | 150-180lb (i.e. Eibach 7011)
23.5mm | 191% | 300-350lb
25mm | 244% | 450lb

That info was taken from a thread posted a while back

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Posted 18th Jan 2015 at 17:58
Ben_W

Formerly gpm

Location: Lutterworth

Registered: 01 Sep 2007

Posts: 2,941

Status: Offline

Post #5
OK, that confirms what I thought......thanks.

So is the 21mm swap worth doing??

________________________________________

Cherry Red Rallye .... On going OEM spec resto

China Blue GTi6 .... Weekend toy

Black 208 GTi .... Wife's car now

Silver BMW 550i.... The executive missile

Posted 18th Jan 2015 at 18:05
jord294

Seasoned Pro

Location: somewhere in north wales

Registered: 09 Nov 2009

Posts: 3,103

Status: Offline

Post #6
Depends what you want from the car??

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Posted 18th Jan 2015 at 22:16
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

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Post #7
I had 24's on till a while ago and were spot on in a smooth track environment but to bouncy even with GAZ's cranked up to control them when on the road.

As said depends what you want from the car and how much or little weight you have at the back as well as your driving style.

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Posted 19th Jan 2015 at 13:58
Ben_W

Formerly gpm

Location: Lutterworth

Registered: 01 Sep 2007

Posts: 2,941

Status: Offline

Post #8
I'm not quite sure really. Something responsive but not crashy, something that's going to stand up to some fast road driving and enhance the handling......

________________________________________

Cherry Red Rallye .... On going OEM spec resto

China Blue GTi6 .... Weekend toy

Black 208 GTi .... Wife's car now

Silver BMW 550i.... The executive missile

Posted 19th Jan 2015 at 20:00
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

Status: Offline

Post #9
I'd just go for 21's personally but I've found that having decent rear shocks with adjustable bump and rebound makes more difference.

I'm currently running 21mm bars with GAZ Gold adjustable dampers. I massively prefer them to B6 rear dampers which most people tend to go for as their slightly stronger than standard but not too solid. Depends what your budget is.

A lot of people find they can't get the bars out anyway LOL

________________________________________

Black power baby! SUUUUUPERCHARGED Superman
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.
Posted 20th Jan 2015 at 10:20
Ben_W

Formerly gpm

Location: Lutterworth

Registered: 01 Sep 2007

Posts: 2,941

Status: Offline

Post #10
Thanks for that.

I'm half tempted to buy another beam in bits and clean it up and rebuild it. Doesn't matter it the torsion bars won't come.out of the old one then...!!

Thanks for the shocks advice, that's useful

________________________________________

Cherry Red Rallye .... On going OEM spec resto

China Blue GTi6 .... Weekend toy

Black 208 GTi .... Wife's car now

Silver BMW 550i.... The executive missile

Posted 20th Jan 2015 at 20:52
jord294

Seasoned Pro

Location: somewhere in north wales

Registered: 09 Nov 2009

Posts: 3,103

Status: Offline

Post #11
What front suspension set up will you be using?

________________________________________

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IF I'M NOT HERE, IT ONLY MEANS ONE THING.... I'M SOMEWHERE ELSE!
Posted 20th Jan 2015 at 22:13

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