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#Post#: 2230--------------------------------------------------
trackday coilovers, what kg?
By: Pingman Date: November 17, 2017, 1:48 am
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Hey guys,
My tuned mk2 16v came with the budget Prosport coilovers but I
find them a bit soft/body rolley on a track day. The BC racing
adjustable damping units look good for their price point but
unsure what spring kg to run and they come in so many options,
any advice please? (I also already have eibach sway bars front
and rear)
front/rear
5/4kg/mm
5/6kg/mm
6/4kg/mm
7/5kg/mm
7/9kg/mm
7/10kg/mm
8/10kg/mm
9/8Kg/mm
10/8kg/mm
11/9kg/mm
12/10kg/mm
help appreciated!
#Post#: 2231--------------------------------------------------
Re: trackday coilovers, what kg?
By: RobT Date: November 17, 2017, 3:02 am
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Hi - there are lots of views about this and many things affect
it.
But to begin 1kg/mm = 56lb/in which are units something a lot
more people are familiar with.
With a golf, the key to handling is to prevent loss of front
negative camber in roll, and front nearside compression. This
can be done in many ways - suspension geometry, anti-roll bars,
reducing the weight of the car, spring rate, damper
characteristics (primarily low speed bump).
Putting rock hard springs on is a simple way to achieve this but
traction will suffer as the tyre wont be able to ride the bumps.
If you drive on super smooth tracks then that's less of an
issue.
If you use slicks, you will have more grip which will lead to
more roll and correspondingly you will need more tactics to
counteract that roll.
I cannot remember the exact figures but I will dig them out
tonight for my sprint Ibiza - this ran on big sticky slicks and
didn't roll much at all towards the end of development, but
equally was not super stiff, rode the bumps well, and was a
proper weapon in the rain.
Cheers
Rob
#Post#: 2233--------------------------------------------------
Re: trackday coilovers, what kg?
By: Pingman Date: November 17, 2017, 9:37 pm
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[quote author=RobT link=topic=266.msg2231#msg2231
date=1510909342]
[/quote]
Hi Rob,
Thanks for quick reply,
I'm good with kg/mm, though actually not good with the old lb/in
lol
Your figures could well help and will give me a starting point,
how much did the car weigh would help too.
I'm no on slicks, on 'semi slick' track day tyres - RSR595s
Here's the evident 'roll' at brands going through druid:
HTML https://c1.staticflickr.com/5/4529/38208850322_0dd3b5123c_h.jpg
#Post#: 2234--------------------------------------------------
Re: trackday coilovers, what kg?
By: RobT Date: November 19, 2017, 1:59 pm
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Info here
HTML http://clubgti.com/showthread.php?263043-Advice-on-springs-please-ibiza-6k2-track-car
I've sold my Ibiza now but basically I ended up with about 400lb
front springs, 250lb rears, 25mm Eibach rear ARB, and an
adjustable front ARB which went from about 50-150% what a 28mm
regular bar would do. About -2 front and -1.5 rear camber.
Slight toe in at rear, parallel toe at front. Custom drop-pin in
the upright to raise the front roll center. Car was set up on
corner weight scales for even weight distribution. It drove
lovely - plenty of traction, rode the curbs and bumps well,
didn't roll much at all even on sticky slicks.
Think the car ended up around 900kg, would have been around 60%
frint.
Cheers
Rob
#Post#: 2235--------------------------------------------------
Re: trackday coilovers, what kg?
By: Pingman Date: November 24, 2017, 1:22 pm
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[quote author=RobT link=topic=266.msg2234#msg2234
date=1511121550][/quote]
Cheers Rob, that's some good info.
matches up near enough to BC Racing's 7kg front 5kg rear listed
track spring rates.
Where did you get the adjustable front ARB? not seen on of those
before!
#Post#: 2236--------------------------------------------------
Re: trackday coilovers, what kg?
By: RobT Date: November 24, 2017, 2:49 pm
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I had it made.
#Post#: 2237--------------------------------------------------
Re: trackday coilovers, what kg?
By: Pingman Date: November 25, 2017, 7:58 am
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[quote author=RobT link=topic=266.msg2236#msg2236
date=1511556550]
I had it made.
[/quote]
Sounds very interesting, is it a rally 'blade' style in car
adjustable one? or more a fixed one with different holes you can
move too on the bar itself? would be interested to see photos of
it if you have any.
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