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Old 10-18-2012, 08:07 PM   #43
the bruce
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If someone knows the wall thickness of the Hotchkis it's easy to calculate the stiffness ratios.
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Old 10-18-2012, 08:37 PM   #44
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Doesn't say. Only says:

Adjustable from +90%, 135% and 200% increase in stiffness over stock.

Which would mean 113-178 N/mm depending on setting. Which setting did you use to calculate 122 N/mm for the 24mm bar?
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Old 10-18-2012, 08:54 PM   #45
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there's a reason you see 27mm RSB's for sale all the time on here....
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Old 10-18-2012, 10:06 PM   #46
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Quote:
Originally Posted by troyguitar View Post
Only says:

Adjustable from +90%, 135% and 200% increase in stiffness over stock.

Which would mean 113-178 N/mm depending on setting. Which setting did you use to calculate 122 N/mm for the 24mm bar?

122 N/mm is the theoretical 'medium setting' while 109 and 139 N/mm are the real settings.


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Originally Posted by the bruce View Post
This is the sway bar stiffness in N/mm.


short arm vs. long arm

....
....

- stock rear sway bar Mk.V/VI GTI, dia 21,7 x 3 mm - tube:

c = 59,5 N/mm

- H&R rear sway bar, diameter. 24 mm - solid:

c = 122,7 N/mm center (~ 109 N/mm long and 139 N/mm short arm)


Obviously the rear H&R doubles the torsional resistance, ....

The question is if the Hotchkis values are related to the stock GTI rear sway
or to the softer stock Golf/Rabbit rear sway bar.

Nevertheless I wouldn't fit a rear sway only. I'd always do both. If fitting rear
only a 22 or 23 mm solid bar would be the better choice.
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Old 10-18-2012, 11:20 PM   #47
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Quote:
Originally Posted by GunKata View Post
there's a reason you see 27mm RSB's for sale all the time on here....
As in they're too soft or they're too stiff?
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Old 10-18-2012, 11:34 PM   #48
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don't know if this is too off topic but how will adding something like a Unibrace UB affect the suspension feel? Would it act like sway bars?
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Old 10-19-2012, 12:18 AM   #49
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sorry for the late reply
http://img02.taobaocdn.com/imgextra/...!!82030992.jpg
http://img01.taobaocdn.com/imgextra/...!!82030992.jpg
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Old 10-19-2012, 12:19 AM   #50
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Old 10-19-2012, 12:19 AM   #51
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Old 10-19-2012, 12:26 AM   #52
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Quote:
Originally Posted by troyguitar View Post
As in they're too soft or they're too stiff?
the latter. my 24mm on my GTI, set to stiff, was way too much for me on the streets.
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Old 10-19-2012, 02:19 AM   #53
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I quite understand.

THX, crabb45.

EDIT:
I figured out H&R makes these yellow bars for the Chinese market.
Possibly some of us are jealous of these colored sways.
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Last edited by the bruce; 10-19-2012 at 03:21 AM.
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Old 10-19-2012, 09:02 AM   #54
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Quote:
Originally Posted by GunKata View Post
the latter. my 24mm on my GTI, set to stiff, was way too much for me on the streets.
Fortunately it can be set to soft for the street and bumped back to stiff at the track.

We probably have different tolerances for stiffness too. 20 years of racing karts with no suspension at all besides the flex in the tire sidewalls and the flex in the frame tends to make one more tolerant of a stiff suspension

The question, unfortunately, still remains as to which car the Hotchkis quoted stiffness increase over "stock" is actually being compared. They list:

10-11 Volkswagen Jetta TDI
09-12 Volkswagen Jetta MKVI
09-12 Volkswagen GTI MKVI
09-10 Volkswagen Golf MKVI
06-08 Volkswagen Jetta MKV
06-08 Volkswagen GTI MKV
06-08 Volkswagen Golf MKV
06-08 Audi A3
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Old 10-20-2012, 08:25 PM   #55
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Indeed. Ask Hotchkis?

(A3 sways are way softer than GTI's while I presume the A3 S-Line comes with stiffer springs)
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Old 10-20-2012, 08:41 PM   #56
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I sent them email, no response yet. Will update if/when I ever find out the answer.
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