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Suspension, Handling & Brakes Suspension set ups, uprated brakes

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Old 29-06-2016, 11:05 AM   #1
TarkMalbot
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Gravel Rally Car Suspension Setup

Hi,
I am trying to build up a gravel car and was wanting a good starting point for the suspension regarding torsion bar and ARB sizes front and back for use on gravel stages.
I am likely to run Bilstein Group N dampers and currently have 170lb front springs.
Thanks.
Mark.
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Old 29-06-2016, 11:24 AM   #2
Cris B
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Do a search on the forum Garry M has posted a lot of valuable information about Spring rates and coilover conversions should you go down that route
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Old 29-06-2016, 03:05 PM   #3
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I have been searching for hours all over the internet and keep coming across the same few forum topics but I am getting conflicting information as some people say don't use a front ARB on gravel and some say don't and others say dont use a rear ARB on gravel. At the moment my car is running Group N Tarmac dampers on the rear with an Xsi rear ARB and GTI Torsion Bars and Group N Tarmac inserts and 170lb springs on the front. Unsure about the front ARB (Although I know it has one).
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Old 29-06-2016, 03:36 PM   #4
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it depends massively on driving style and techniques as much as anything else.

the tarmac saxo I service for doesn't run a front arb, but it is a satchell setup and colin does most of his without roll bars at all, does have a standard VTS rear arb though.

traction is fantastic.
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Old 30-06-2016, 07:34 AM   #5
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Old 01-07-2016, 01:28 AM   #6
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I recently build a 106 for gravel, Proflex front and rear shocks. I think you shoul try thiner ARB front and rear. Also i had listen to remove the front one, and use a thiner on the rear. The GTi one is 24mm, too hard for gravel.

I'm testing lot of new things because is a complete new car that we build, so i will keep you with information about the results.
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Old 18-12-2016, 02:47 PM   #7
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Quote:
Originally Posted by BGuic View Post
I recently build a 106 for gravel, Proflex front and rear shocks. I think you shoul try thiner ARB front and rear. Also i had listen to remove the front one, and use a thiner on the rear. The GTi one is 24mm, too hard for gravel.

I'm testing lot of new things because is a complete new car that we build, so i will keep you with information about the results.
Any progress with this? I have done a few rallies this year but have a new car for 2017 which I will be setting up and can use some of the components from my old car if any use.

It turns out I have 306 dampers in my front struts. They are K4-XDE-60660T9 which is a 300/200 Tarmac Damper. I have 10.5" long 2.25"ID 170lb springs on them.

On the rear I have Blue Sleeve Bilsteins B46-1276, GTI Torsion Bar and 1.4 XSI ARB.

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Originally Posted by blakeyrallye View Post
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Sorry for the delay but I have replied.

Last edited by TarkMalbot; 18-12-2016 at 02:47 PM. Reason: Automerged Doublepost
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Old 19-12-2016, 11:07 AM   #8
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300/200 sounds more like 205 inserts, that part number would be long top spindle iirc.
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Old 19-12-2016, 11:25 AM   #9
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Quote:
Originally Posted by welshpug View Post
300/200 sounds more like 205 inserts, that part number would be long top spindle iirc.
I didn't know what they were so took the numbers off them and e-mailed Bilstein.

"This could be K4-XDE-60660T9 – this is actually listed as a 306 insert…

These are not stocked/available off the shelf, but we should be able to make some to order if required.

The setting if they have not been modified is 300/200 which is Tarmac."

I am getting some really conflicting information about the rear dampers too! Everyone I speak to has said something different so far.

Just some of the comments:

" Group A have black boots, Group N have Blue Boots"

"Group A F4-B46-2220-T1 = 460/250 (@.39M/s)– supposedly tarmac"

"Group A F4-B46-2220-T0 – 360/250 (@.39M/s) – supposedly forest"

"Group N: B46-1276 = 480/280 @.39M/s"

Totally confused!

Last edited by TarkMalbot; 19-12-2016 at 12:08 PM. Reason: More info
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