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Suspension, Handling & Brakes Suspension set ups, uprated brakes

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Old 23-05-2010, 09:42 PM   #1
oniL
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22mm torsion bars with B8

hello everyone.

I got Bilstien B8 dumpers + 30 mm Eibach springs.
I got an option to buy 22 mm Peugeot Sport torsion bars.
and I wanted to ask:
the dumpers can handle it?
maybe it's too thick?

If there is anyone that used to drive like that, I will be happy to hear what he has
to say about it.

I checked the torsion bars myself, and the diameter was 22 mm.
any help will be very appreciated.
thanks in advance.
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Old 24-05-2010, 09:06 AM   #2
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Too stiff for the B8s I reckon, they're only really suited to standard torsion bars. 22mm bars are designed for the Peugeot Sport Gravel dampers I think.
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Old 24-05-2010, 09:19 AM   #3
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what will happen if I will install the torsion bars?
I really do not have any option to get other dumpers, the B8's are the best that I can get.

Bilstein B8 + 30 mm Eibach springs + Powerflex + upper and lower strut brace + 22mm torsion bars + 185.55.14 yoko A048.

^^ won't be balanced?
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Old 24-05-2010, 09:24 AM   #4
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I suppose all you can do is try it really, best case is they're a bit oversteery, worst case is they knacker your rear dampers as they might not be able to damp the higher spring rate of the 22mm bars.
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Old 24-05-2010, 09:29 AM   #5
oniL
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and what about 21 mm torsion bars?
it will be fine?

1 mm can make such a different?
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Old 24-05-2010, 11:15 AM   #6
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Quote:
Originally Posted by oniL View Post
and what about 21 mm torsion bars?
it will be fine?

1 mm can make such a different?
Um, yes it makes a really big difference:

As Sandy has previously stated, approximate torsion bar rates at the wheel are:

18mm 90lb/inch
19mm 110lb/inch
20mm 135lb/inch
21mm 165lb/inch
22mm 195lb/inch
23mm 235lb/inch
24mm 280lb/inch
25mm 330lb/inch

So going from 19mm standard bars to 21mm is a 65lb/inch increase!

If you are going to change the rear torsion bars you'll need to make sure the front springs are suited. Additionally you will need to make sure that your dampers are up to the job too. It's never simple making suspension changes, if you're going to do it you'll need to go the whole hog and do it properly... which will be expensive

In short the simple solution is keep the rear torsion bar standard.

If you uprate your rear torsion bar you will also need to uprate the front springs. When you go beyond a certain level of increase the stock dampners will need to either be replaced (or if they are Bilsteins you can get them revalved for a price) as they will not be optimised for the new stiffer spring setup and will be massively under the required level.

i.e. the standard settings are for relatively soft springs and as such the shocks are optimised for controlling the rebound of the suspension in this setup.

If you uprate the suspension, the springs become relatively hard and resist movement. As such the shock will no longer be optimised for the springs.

There are various posts in this part of the forum about ideal setups, mainly focused around the PSF Tarmac spec shocks, but there are many other options from the likes of Leda, Gaz, AST or of course getting your Bilsteins sent off to be tuned (basically getting the shims stack inside tailored for your setup).
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Old 04-06-2010, 03:42 PM   #7
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Group N bilsteins; 155lb Faulkners, 'b8' rear bilsteins..
Keep std or get 21mm Tbars ?



Also, i've got 23mm Tbars and PSF dampers on the rear of my other car, with Leda adjustables up front. I figured 350lb springs would be sufficient to get away with running no front ARB but im not sure what i should get the front dampers re-valved to? will be used with race slicks for trackdays.

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Old 04-06-2010, 06:42 PM   #8
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I'd try a 20mm front ARB rather than no ARB.
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Old 05-06-2010, 12:57 AM   #9
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Quote:
Originally Posted by Aleksandr View Post
I'd try a 20mm front ARB rather than no ARB.
no front arb is the way.
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Old 05-06-2010, 08:47 PM   #10
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Quote:
Originally Posted by freddy6868 View Post
no front arb is the way.
personal taste I'd say ,,depends on alot of factors ,,spring poundages and damper compression valving.
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Old 06-06-2010, 06:27 PM   #11
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Quote:
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no front arb is the way.
Maybe in the woods but not on tarmac.
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Old 24-07-2011, 03:41 PM   #12
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Quote:
Originally Posted by Garry.M View Post
personal taste I'd say ,,depends on alot of factors ,,spring poundages and damper compression valving.


and road surfaces too !!!!!!!!!!

here in Malta most of the road surfaces are a nightmare
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