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XRAY - Model racing cars :: View topic - Setup advice
XRAY - Model racing cars
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Setup advice
https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=8&t=11415		 Page 1 of 1
Author:  dgi [ Mon May 23, 2011 14:10:15 ]
Post subject:  Setup advice
I ran at the STCC round at Adur (UK) at the weekend and struggled with setup for most of the day with the back of the car being very loose both on corner entry and exit. This gave me a car that I was having to tip toe in and out of the corners to avoid the rear coming round, and was no fun to drive.

I'm running a T3 with the setup very close to the kit standard, except the droop was set to 5 and 4, ride height 5 and 5.5, 425 cst oil all round (rebound of 25%), and the wheelbase lengthed (all shims moved to the front of the rear wishbone).

What changes would you make and in what order to try to dial out both off power and on power oversteer?

Don
Author:  markw [ Mon May 23, 2011 14:34:41 ]
Post subject:  Re: Setup advice
my car was nearly spot on in the finals only half a second from mark fuller best lap , just shame bout the driver :(

droop 4 all round
1.1mm 3 hole pistons
50 wt in front 45 rear (full rebound)
2.8 ft 2.6 bk springs
1.4 roll bars all round
ride height 5.5 all round
track width on front was 1.2mm spacers (found that gave me more steering )
speed 6 shell

going back to geared diff at southend (lost a drive shaft on sat so cudnt run it)

the rest is kit set up ....

as mike as said loads of times its down to tire prep... love to no wat he does coz mark was realy fast all day...
Author:  Skiddins [ Mon May 23, 2011 14:48:02 ]
Post subject:  Re: Setup advice
I ran simlar to both of you but;

Standard wheelbase
450cst/350cst
2.6/2.6 springs
5mm ride height
5-4 droop
1.4/1.1 roll bars
0.5mm above front C Hub
Shocks in position 3
Author:  dgi [ Tue May 24, 2011 00:04:48 ]
Post subject:  Re: Setup advice
Looks like our setups were very similar - my more detailed setup:

Droop 5 ft, 4 bk
Ride height 5 ft, 5.5 bk
Alloy Shocks 1.1mm 3 hole piston
Oil 425 cst all round
Shocks in position 3 all round
Roll bars 1.4 ft, 1.2 bk
Springs 3.0 ft, 2.6 bk
Camber -1.5 degress all round
1mm shim on front c-hub
4mm shim on rear hub
l1/l2 roll centers
Speed 6 shell
Ball diff

I notice that both your springs are softer at the front. Doesn't this give you more front end, so would exasberate any instability at the rear?

Perhaps all this is coming back to my tyre prep - What magic were you using ;-)? My tyres had previosly been run at the STCC round at Brooklands, I was cleaning with lighter fluid and applying LRP carpet and baking at 60 degrees for approx. 20 minutes before my run.

I'm still interested in how you dial out oversteer as I've struggled with this in the past.

Don
Author:  Skiddins [ Tue May 24, 2011 01:47:59 ]
Post subject:  Re: Setup advice
I only had some oversteer if I was violent or used a lot of lock when braking around a corner, but it was managable.

I had soft front springs to try and get the car to turn in harder as I think this is where mine was lacking.

I tried a couple of different carpet additives and CS Max Grip and couldn't tell any difference between them, although my fastest lap was set using Max Grip (16.57)
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