Advice on setup

[Greeny.]

Morning all,
On my last trackday I had 'bouncing' issues around slow(ish) corners loosing me loads of speed, had no issues with certain cars behind me on the straights but they were destroying me around corners as I just couldn't hold enough speed, when I tried to use more speed in/through them my car was bouncing around fairly badly and couldn't hold the speed. I'm not the best driver in the world by any means but can only assume I had my tyre pressures/dampening adjusted incorrectly.

Any advice please lads?

Cheers,
Dan

 

[DannyR]

What coilovers do you have? What's your camber and toe settings?

Was it the front bouncing or the rear?

 

[Greeny.]

What coilovers do you have? What's your camber and toe settings?

Was it the front bouncing or the rear?

BC Racing coilovers, I know you hate them, but not alot of options for Cup hubs, plus you get ALOT for the money. These were set fairly hard, if not at max.

Tyres were fairly soft as well, can't remember the exact hot pressure, but seem to recall around the 28's, this is on RSR's.

Toe/Camber standard minus the added camber from lowering the car as you would expect, average joe tracking was done before the trackday.

Bouncing on the front from what I remember.

 

[MarkX]

28psi hot?
They need more pressure, mine were set to 28.5psi cold and they were great. I'd try winding the damping back a little too, soft springs and little damping isn't great imo

 

[Greeny.]

I have the stiffer front spring setup but yes I agree perhaps they were a little stif!

 

[NorthloopCup]

What are the spring rates? Front and rear?

 

[Greeny.]

Listed as 5/8 kg?!

 

[NorthloopCup]

Listed as 5/8 kg?!

What's that mean in English then? Lb/ft or Newtons.

 

[TheEvilGiraffe]

What's the standard spring rates in the BCs .. Mine are magic on track even on full hard.

@MicKPM .. wot fink ?

I bet if you put 200kg in the car you'd have no issues :wink:

~~~~~~~~~

ok .. found it .. http://www.bc-racing.co.uk/applicat...sport-98-04/br-series-coilover-type-rn-1.html

4f / 8r kg/mm 'road' and 5f / 8r 'track'.

So you're 25% stiffer on the front end than mine.. and you've probably taken 100+kg out of it haha..

Derp.

 

[MicKPM]

You got em chap - They're brilliant aren't they on and off the track
FR 4.0kg/8.0kg RR = 220lb/450lb

 

[TheEvilGiraffe]

You got em chap - They're brilliant aren't they on and off the track

Yep. Think Dan's gone too stiff to start with ? [Ooh err..]

 

[MicKPM]

Sounds very much like too stiff a setup causing him to "skip" yes thus losing front end grip.

 

[Greeny.]

Shite, what do? Only bought these rates as they were branded as 'track' such a noob.

 

[TheEvilGiraffe]

IIRC you can buy pairs of springs for not-a-lot.. like £50 ? ..

Are you getting issues on the road with Tigger like bouncing..? Can only suggest you drop the damping down a few clicks perhaps and see what happens.... maybe the whole system is too firm..

Failing that - buy a new pair of fronts and sell those ones..

 

[DannyR]

I'd adjust the dampening first, especially if they are full hard.

 

[...]

Tyre sidewall issues , loads of grip winding up the chassis which then loads and unloads the outside front tyre

Stiifer sidewalled tyres , more pressure would be 2 starters

However has the car been corner weighted

Is the hopping the same on left and right corners and what sort of speeds ;

 

[NorthloopCup]

Sounds very much like too stiff a setup causing him to "skip" yes thus losing front end grip.

Mines stiffer than that mick (ooh er!) and it doesn't make the car skip.

 

[NorthloopCup]

Shite, what do? Only bought these rates as they were branded as 'track' such a noob.

Full soft on the front, full stiff on the rear and up the tyre pressures as a starting point.
Try it and adjust as necessary.

 

[MicKPM]

Mines stiffer than that mick (ooh er!) and it doesn't make the car skip.

I'm stiffer to but we're still talking suspension, right? Hehehe

We don't know what setup the car is running or the exact configuration either so it could be a combination of anything (too low, incorrect weight distribution, tyres, etc).

A proper geo setup is often overlooked but is also often the difference between a mediocre and a good car to drive.

 

[NorthloopCup]

I'm stiffer to but we're still talking suspension, right? Hehehe

We don't know what setup the car is running or the exact configuration either so it could be a combination of anything (too low, incorrect weight distribution, tyres, etc).

A proper geo setup is often overlooked but is also often the difference between a mediocre and a good car to drive.

Too many variables mate.

 

[...]

Agree totally

First thing after fitting shocks is full geo , then see how it behaves.

Then you can decide on how it feels and whats going on.

Working from an unknown base isnt an easy place to start

 

[Greeny.]

I'll have a play at the next track day, hard to reproduce it on the roads tbh!

I have xl rsr's so it has the stiffer sidewalls, however I think they were to soft and everything else to stif!

I'm so good at this lol need to learn how to drive next

 

[Greeny.]

Where are you based Mick and how much do you charge for a geo setup? Oh I've also lost my rear shims.... Was going to put the rear up slightly as the cars fairly flat atm, that or bring the front down but if I need to soften the front I might get some rubbing on my 205's rsr's if it's a lot lower

 

[NorthloopCup]

Where are you based Mick and how much do you charge for a geo setup? Oh I've also lost my rear shims.... Was going to put the rear up slightly as the cars fairly flat atm, that or bring the front down but if I need to soften the front I might get some rubbing on my 205's rsr's if it's a lot lower

Micks in Nottingham mate.

 

[MicKPM]

Where are you based Mick and how much do you charge for a geo setup? Oh I've also lost my rear shims.... Was going to put the rear up slightly as the cars fairly flat atm, that or bring the front down but if I need to soften the front I might get some rubbing on my 205's rsr's if it's a lot lower

I can't do a full and proper setup just yet as the builders are just starting the office and build areas. After that (and when the bank account has recovered) I want to put in a proper flat patch.