Suspension adjustment - bump/rebound - Page 2

_Nathan_ · 15-03-2009, 10:16 PM

Would assume the springs have the rates written on them, you can use quite a different range with 1k2 as there is so much adjustment in them.

Bealo · 16-03-2009, 04:12 AM

I'm on KW V3 Clubsports and yes they are pretty hard on the road but i've gotten used to it.

I have had a play with the settings on the track but to be honest haven't got a clue as to what i'm doing LOL.

I intend to take the car to get the Geometry set up and a good basic track setting and road setting for the KW's then just switch between the 2 settings.

bryce · 16-03-2009, 04:20 PM

Quote:

Originally Posted by CATDT

Bryce

Colin says you're welcome to give him a call (01234 757633) as the quickest answer for you. He will penn a reply for all to read but it will be about a page long. He's out this evening and we have a corporate event tomorrow, so the earliest for his view here will be tomorrow evening.

Jo

Cheers Jo, thats very good of Colin.

Ive sent Thorney an email to see what they'd advise first (bought KWs from them), but if I have no luck I'll give Colin a shout.

Looking forward to Colins write up regardless.

Bealo · 17-03-2009, 05:11 AM

bryce

Let me know what settings Thorney recommends i would be interested to see how far off i'm with mine.

bryce · 17-03-2009, 02:57 PM

Quote:

Originally Posted by Bealo

bryce

Let me know what settings Thorney recommends i would be interested to see how far off i'm with mine.

No problem, will do

Whats yours set at just now anyway?

**DazBlackCSL** · 17-03-2009, 05:06 PM

Will get my settings on Friday for you, if your interested and post up when im back as im there on friday ...

Exhaust will be on for drive home !!!!!!!!!!!

bryce · 17-03-2009, 05:15 PM

That'd be spot on Daz, as you seem to use your car quite a bit for the road. Keep a note and fire them up here please

Oh, and I wanna see/hear a vid of this new zorst!

**DazBlackCSL** · 17-03-2009, 07:57 PM

Quote:

Originally Posted by bryce

That'd be spot on Daz, as you seem to use your car quite a bit for the road. Keep a note and fire them up here please

Oh, and I wanna see/hear a vid of this new zorst!

Na Worries my man

Will do .... all being well will do some cheeky vids and the obligatory pics over the weekend !!

CATDT · 17-03-2009, 09:13 PM

Bryce - apologies for the delay but our event took it out of us yesterday

Here is Colin's written information for you - but as he says, a verbal conversation is easier, so if you would like to chat any aspect through he'll be very happy to do so. He will next be in the office on Thursday.

Jo
-----
The Variant 3 system is track focused and offers little adjustment of the ride comfort setting. If you look at the adjustments more commonly found on a race or track damper it will help to understand what is happening underneath you when the wheel is excited by the road or the vehicle negotiates a corner.

Race/ Track dampers commonly have up to 3 settings (Variant 3s have 2)

High Speed Bump
This adjustment controls how the wheel reacts when the wheel is accelerated quickly over large bumps and holes in the road or a kerb or rumble strip on a circuit. It is controlling the unsprung mass of the wheel and suspension. High speed is not referring to the speed of the car but the speed of the impact and deflection experienced by the suspension. If the owner sets this overly stiff for the driving conditions the tyre will not follow the road, and grip can be reduced considerably, especially in the wet. On your Variant 3s this has been pre set by the factory and is not adjustable.

Low Speed Bump
This is adjustable on the Variant 3 and offers subtle adjustment of the unsprung mass consequently this reduces, in a limited way, body roll - reducing roll rates as you brake corner and accelerate. This adjustment offers fine control, a vernier adjustment with smaller gains in body control than the rebound adjuster.

Rebound Adjustment
This is adjustable on the Variant 3s. Its main function is to control the body’s dynamic movement. Remember as the body rolls the suspension is deflected through its range of movement, a soft setting can have a negative effect on circuit and road. Exaggerated body roll can affect the tyres capability to remain perpendicular to the road, as larger camber changes will be experienced by the tyre.

In summary by backing off both adjusters you have reduced the bodies resistance to dynamic movement (Dive, Roll and Pitch), hence the floating feel when changing lanes. But you still have stiff track focused high speed pre set bump settings, so the wheel is finding it difficult to follow the road and cope with the additional body roll and subsequent camber change. I hope this all makes sense – it’s much easier to talk and demonstrate on circuit than explain in writing.

My recommendation would be to stiffen the settings and find a compromise, so the rebound and low speed bump give a more predictable feel to the vehicle and ride comfort is reduced but acceptable. When you have one adjustment on a performance damper you are invariably adjusting rebound adjustment, as manufacturers do not like to give you isolated high speed bump adjustment, as it can compromise safety if set to stiff.

Nords · 17-03-2009, 09:59 PM

Interesting, so is it just 'overall' damping that is adjusted on Intrax? What does 'THIS BIT HERE' do?

17-03-2009, 05:06 PM	#16
DazBlackCSL CSL Register Uber-poster! Join Date: Apr 2008 Location: Shaboogling Posts: 7,199 Casino cash: $28478	Will get my settings on Friday for you, if your interested and post up when im back as im there on friday ... Exhaust will be on for drive home !!!!!!!!!!! __________________ CSL Register Lifestyle Coach and Social Secretary

17-03-2009, 09:13 PM	#19
CATDT S4 - Getting the hang of it Join Date: Feb 2009 Location: Bedfordshire Posts: 140 Casino cash: $1292	Bryce - apologies for the delay but our event took it out of us yesterday Here is Colin's written information for you - but as he says, a verbal conversation is easier, so if you would like to chat any aspect through he'll be very happy to do so. He will next be in the office on Thursday. Jo ----- The Variant 3 system is track focused and offers little adjustment of the ride comfort setting. If you look at the adjustments more commonly found on a race or track damper it will help to understand what is happening underneath you when the wheel is excited by the road or the vehicle negotiates a corner. Race/ Track dampers commonly have up to 3 settings (Variant 3s have 2) High Speed Bump This adjustment controls how the wheel reacts when the wheel is accelerated quickly over large bumps and holes in the road or a kerb or rumble strip on a circuit. It is controlling the unsprung mass of the wheel and suspension. High speed is not referring to the speed of the car but the speed of the impact and deflection experienced by the suspension. If the owner sets this overly stiff for the driving conditions the tyre will not follow the road, and grip can be reduced considerably, especially in the wet. On your Variant 3s this has been pre set by the factory and is not adjustable. Low Speed Bump This is adjustable on the Variant 3 and offers subtle adjustment of the unsprung mass consequently this reduces, in a limited way, body roll - reducing roll rates as you brake corner and accelerate. This adjustment offers fine control, a vernier adjustment with smaller gains in body control than the rebound adjuster. Rebound Adjustment This is adjustable on the Variant 3s. Its main function is to control the body’s dynamic movement. Remember as the body rolls the suspension is deflected through its range of movement, a soft setting can have a negative effect on circuit and road. Exaggerated body roll can affect the tyres capability to remain perpendicular to the road, as larger camber changes will be experienced by the tyre. In summary by backing off both adjusters you have reduced the bodies resistance to dynamic movement (Dive, Roll and Pitch), hence the floating feel when changing lanes. But you still have stiff track focused high speed pre set bump settings, so the wheel is finding it difficult to follow the road and cope with the additional body roll and subsequent camber change. I hope this all makes sense – it’s much easier to talk and demonstrate on circuit than explain in writing. My recommendation would be to stiffen the settings and find a compromise, so the rebound and low speed bump give a more predictable feel to the vehicle and ride comfort is reduced but acceptable. When you have one adjustment on a performance damper you are invariably adjusting rebound adjustment, as manufacturers do not like to give you isolated high speed bump adjustment, as it can compromise safety if set to stiff. __________________ __________________ http://www.catdrivertraining.co.uk "It's run by a top team of people and we thoroughly recommend them - Fifth Gear."

15-03-2009, 10:16 PM	#11
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	Would assume the springs have the rates written on them, you can use quite a different range with 1k2 as there is so much adjustment in them.

16-03-2009, 04:12 AM	#12
Bealo Driving it like I nicked it Join Date: Aug 2008 Location: Everywhere. Posts: 2,540 Casino cash: $12738	I'm on KW V3 Clubsports and yes they are pretty hard on the road but i've gotten used to it. I have had a play with the settings on the track but to be honest haven't got a clue as to what i'm doing LOL. I intend to take the car to get the Geometry set up and a good basic track setting and road setting for the KW's then just switch between the 2 settings.

17-03-2009, 05:11 AM	#14
Bealo Driving it like I nicked it Join Date: Aug 2008 Location: Everywhere. Posts: 2,540 Casino cash: $12738	bryce Let me know what settings Thorney recommends i would be interested to see how far off i'm with mine.

17-03-2009, 05:15 PM	#17
bryce S5, Sport On, DSC M-track Join Date: Nov 2008 Location: Scotland (sw) Posts: 1,369 Casino cash: $2512	That'd be spot on Daz, as you seem to use your car quite a bit for the road. Keep a note and fire them up here please Oh, and I wanna see/hear a vid of this new zorst!

17-03-2009, 09:59 PM	#20
Nords S5, Sport Off, DSC M-track Join Date: Jan 2009 Posts: 527 Casino cash: $1272	Interesting, so is it just 'overall' damping that is adjusted on Intrax? What does 'THIS BIT HERE' do?