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Author Subject: Track suspension setup
alexd

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Location: Canvey Island

Registered: 05 Jul 2011

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Post #1
Hi,

Ok we have had our track car a little while now and starting to think about improvements.

I know all the old timers whose advice i really need have more than likely answered this question 100 times over but, I have done a few searches on here to gather some info and it didnt really turn up what i wanted. Maybe im searching for the wrong keywords and feel free to push me in the right direction.

Below is a list of mods i think we need:

Hybrid Arb

Solid rear beam mounts

21mm Torsion bars

Roller bearing wishbone kit

Now, currently we are running on Spax RSX height adjustable & dampening coilover kit with a solid race spoox motorsport top engine mount, powerflex bottom engine mount, a group N gearbox mount, a OMP strut brace and o.e wishbone bushes

What order should we do the above in, im thinking the order i have placed them above?

Thanks for any help or advice you can give.

Alex

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Posted 3rd Nov 2011 at 12:31
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rallyeash

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Location: Devizes

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Post #2
sounds like your thinking in the right direction.

i would do solid beam mounts, tb's and arb at the same time and wishbone kit when funds allow.


if you havent already, get a decent set of front pads with brembo discs, decent track tyres (R888's) and an thermostatic oil cooler.

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Posted 3rd Nov 2011 at 12:44
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #3
fatter torsion bars Thumbs up

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Posted 3rd Nov 2011 at 12:49
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coskev

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Location: Oswestry

Registered: 01 Nov 2009

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Post #4
Mines not a track car,but have just fitted a rebuilt rear beam with 21mm TB's and solid mounts with Koni dampersWink

I thought it handled well beforeLOL now its brilliantCool

Got some solid mounts in the garage if your after some,PM for detailsThumbs up

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Posted 3rd Nov 2011 at 12:55
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simonjames

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Location: Whitland S.Wales

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Post #5
Thats the set up im running on mine but with AVO coilovers not had a chance to take on track yet but driving it localy it does handle quite well, i just need to lift the front slightly though

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Posted 3rd Nov 2011 at 13:00
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owain

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Location: Essex

Registered: 20 May 2009

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Post #6
rallyeash wrote:
i would do solid beam mounts, tb's and arb at the same time and wishbone kit when funds allow.

if you havent already, get a decent set of front pads with brembo discs, decent track tyres (R888's) and an thermostatic oil cooler.


All this.

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Posted 3rd Nov 2011 at 13:02
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welshpug!

Capt Pedantic

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Post #7
21mm bars are fine for the road with eibachs etc, really do need larger for coilovers

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Posted 3rd Nov 2011 at 13:17
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owain

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Post #8
welshpug! wrote:
21mm bars are fine for the road with eibachs etc, really do need larger for coilovers


True, but you're talking the difference between £100 for a set from an old Xsara against a few hundred for some Pug Racing ones or whatever they are.

I have 21's on mine and there's very little roll whatsoever.

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Posted 3rd Nov 2011 at 13:19
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #9
got some 23's on the way for £180.

no roll? not trying hard enough Razz

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Posted 3rd Nov 2011 at 14:22
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alexd

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Location: Canvey Island

Registered: 05 Jul 2011

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Post #10
Im glad my searching wasnt a complete waste of time then Smile

Are there any suggestions on height? The previous owners set the height for the 17" track wheels we have and we havent adjusted this, how would i measure the height?

Also would corner weighing be a big benefit?

In the brake department we are running on standard sizes with braided hoses and uprated disks, pads and fluid. I think we will keep it as such until we have finished the suspension mods.

We run slicks on the 17" wheels, i know there is a debate on whether you can use them to their ability but four 2nd hand slicks are a lot cheaper than four R888's or alike Smile

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Posted 3rd Nov 2011 at 14:34
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #11
wheel size has no bearing on ride height unless you are exceeding the standard overall sizing.

measuring up to the sill jacking points is a good reference.

for slicks you will definitely need stiffer springs to make the most out of them.

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Posted 3rd Nov 2011 at 14:44
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simonjames

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Post #12
As Mei said as long as rolling radius is the same heigh doesnt make much difference

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Posted 3rd Nov 2011 at 15:01
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rallyeash

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Post #13
only thing with 17's you might find the rolling radius is to large and will have better acceleration on a set of 15's.
i know my brother dropped from from 17's down to 15" cyclones on his 306 rallye and gained 7mph down the straights at castle combe!

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Posted 3rd Nov 2011 at 15:19
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clen666

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Post #14
welshpug! wrote:
got some 23's on the way for £180.


Oh really, any more info on these?

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Posted 3rd Nov 2011 at 15:32
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hovis16

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Post #15
I have the spax rsx set up with solid mounts, hybrid arb, 21tb,vibratechnics p bushes and an omp brace. I found on the road if feels better without the brace.....but then i havent set the shocks up right and the back end is to high so can be oversteer ish LOL

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Posted 3rd Nov 2011 at 15:38
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alexd

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Post #16
@ Welshpug - What is the standard height from the sill so i can have a reference point? Ive read that a 30mm drop is a good start? I think the rolling radius is increased, can this cause us handling issues?

@ Rallyeash - Yes i think acceleration would be better with the smaller wheels but it takes us back to the road legal track tyres being a lot more expensive than 2nd hand slicks?

Does anyone know how i can find out the spring rate that is fitted? Will it be printed on the spring somewhere?

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Posted 4th Nov 2011 at 11:37
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adam b

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Post #17
As you don't need the 17s for brake clearance get shot of them and use 7" wide 15s instead. They will be lighter and a lot more responsive - you can easily get under 5.5kg per wheel (minus tyres) in that size. And yes the spring rate should be on the spring.

Slicks will be causing your suspension a huge amount of stress at the moment, especially rubber beam mounts and P bushes. What size tyre are you using and what wheel width do you have on?

I guess it depends if you want more grip or better handling at the end of the day. Cost obviously does come into it as well.

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Posted 4th Nov 2011 at 11:49
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hovis16

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Post #18
spring lbs on them is 220 mate

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Posted 4th Nov 2011 at 14:29
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adam b

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Post #19
hovis16 wrote:
spring lbs on them is 220 mate


Assuming they haven't been changed, thats not a bad match for the rear standard springs for a road car.

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Posted 4th Nov 2011 at 15:13
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simonjames

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Post #20
Rear shock from bolt to bolt is 330mm standard if you measure yours you will know what drop its had, for each 20mm the shock is shotened the height drops 30mm

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Posted 4th Nov 2011 at 15:32
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chrisd306

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Post #21
ive got gaz shocks and 450lbs springs and solid kad top mounts, miles solid mounts on rear and 21 bars, and hybrid arb seems to be good, may go for larger torsion bars tho

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Posted 4th Nov 2011 at 21:21
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adam b

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Post #22
Chris - tbh i'd just speak to Ash and Denis about what they are running. Then copy/buy it from them. Thumbs up

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Posted 7th Nov 2011 at 10:35
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owain

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Post #23
If you ever want to talk about springs, Denis is certainly your man Yes

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Posted 7th Nov 2011 at 10:36
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greenbelt

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Post #24
From your list I would do things in this order;

1) Roller bearing wishbone bushes - The increase in steering feedback is immense.
2) Hybrid ARB - The thicker Hybrid ARB reduces roll and your car will feel more planted in long sweeping bends.
3) Solid rear mounts and 21 mm torsion bars - Reduces LOOS and increases stiffness at the rear.


If money and time are not an issue then I would do the roller bearing wishbone bushes first to get used to the more direct feeling and increased feedback. The difference over standard bushes is amazing.

Do everything else at the same time Thumbs up

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Posted 7th Nov 2011 at 19:41
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hovis16

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Post #25
chrisd306 wrote:
ive got gaz shocks and 450lbs springs and solid kad top mounts, miles solid mounts on rear and 21 bars, and hybrid arb seems to be good, may go for larger torsion bars tho


i'll have your 21'sThumbs up

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Posted 7th Nov 2011 at 21:10
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