Over Steer and Understeer
#1 _Viper_
Posted 29 March 2006 - 10:00 PM
And ive heard people talking about sway bars effecting over/understeer.. eg putting one on the rear increases one or the other... which is which?
Cheers
-Viper
#2
Posted 29 March 2006 - 10:36 PM
If the front tyre approach the traction limit more rapidly, the effect is that the front of the car takes a wider radius curve than the driver intended. The car is said to understeer.
Copied from a web site.
RACV MAN
#3
Posted 29 March 2006 - 11:27 PM
Yeah thats a fair description (in simple terms) of understeer, with oversteer its just the reverse (funnily enough) the car will turn in more - with less turns of the steering wheel
There are various factors that will contribute to more or less oversteer/understeer - it is common to get more oversteer when you put a rear sway bar on....
Generally lsd(or locked) vs open wheel diff changes how the car will behave on turn in (and exit) of corners as well. There is also spring rates, shock tuning, whether you have front bar (and how thick it is)..... etc etc
#4
Posted 06 April 2006 - 08:48 PM
Any Ideas,
Les
#5
Posted 06 April 2006 - 09:16 PM
Like "threshold braking" in that the tyre and the road are just starting to move against each other at different speeds. Follow?
The above was copied off a net site and the wording may confuse.
Edited by rodomo, 06 April 2006 - 09:29 PM.
#6
Posted 06 April 2006 - 09:28 PM
Edited by rodomo, 06 April 2006 - 09:30 PM.
#7
Posted 07 April 2006 - 10:24 AM
A car can also have understeer or oversteer with out loosing traction, steering box ratio, the suspension set-up ect.
Just an example, but I drive to work in my missus's Excel with power steering, then I jump into a toyota landcruiser also with power stereing and the steering ratio difference is huge. In the excel I turn the wheel about a 1/4 of a turn for a 90 degree corner, In the landcruiser it's nearly a full turn for a 90 corner.
So after jumping into the cruiser, you tend to understeer as you need to turn the wheel further for the same corner in the cruiser compared to the excel.
Les
#8 _CHOPPER_
Posted 07 April 2006 - 07:30 PM
And ive heard people talking about sway bars effecting over/understeer.. eg putting one on the rear increases one or the other... which is which?
A simple change of camber and castor angles can increase or reduce understeer or oversteer. It may not alter it to the extent you want, but it's a much cheaper option than playiong with sway bars. Good tyres helps a lot too.
#9 _brett_32i_
Posted 09 April 2006 - 09:08 AM
oversteer/understeer is related to the loss of traction at either end, not steering ratio.
#10 _73LJWhiteSL_
Posted 09 April 2006 - 12:06 PM
With the Sprintmasters and some decent tyres the car tends to oversteer before it will understeer.
I am hopping to get the wheel alignment done, and get it setup so it hooks into corners a bit better. I guess more negative camber would help, but what other settings help turn in?
At the moment with regular rotation the tyres are wearing more evenly than the first set i had (wore out the outside edges of the fronts) but it could go further.
Steve
Edited by 73LJWhiteSL, 09 April 2006 - 12:07 PM.
#11 _mervex_
Posted 09 April 2006 - 05:05 PM
#12
Posted 09 April 2006 - 05:25 PM
#13 _devilsadvocate_
Posted 09 April 2006 - 06:02 PM
If you are really trying to get out a tight spot, inching out on full lock can make all the difference to those necessary inches, rather than even trying to get out at even a relatively low speed of 1kmh where slippage can see you still not getting out, the differences are far more dramatic on a slippery surface like grass or wet concrete.
#14 _82911_
Posted 09 April 2006 - 07:35 PM
simply put, understeer is when the front hits the armco first, oversteer is when the backend hits the armco first!
Oversteer is when the passenger is shittin' bricks..
Understeer is when the driver is shittin' bricks...
Cheers Greg..
#15
Posted 10 April 2006 - 08:41 PM
Edited by gtrboyy, 10 April 2006 - 08:42 PM.
#16 _CHOPPER_
Posted 10 April 2006 - 09:45 PM
Without seeing your car, I would suggest a MAXIMUM of -1.5 degres camber. More positive castor would help, but also makes the steering heavier. Start with +2 degrees castor and see how you go. 32 PSI in all tyres helps a bit too.I am hopping to get the wheel alignment done, and get it setup so it hooks into corners a bit better. I guess more negative camber would help, but what other settings help turn in?
#17 _73LJWhiteSL_
Posted 10 April 2006 - 10:12 PM
When i take it back after 5,000ks we will see how its gone and if it needs more of anything.
Its a LJ running King Springs, Koni Adjustables and a whiteline swaybar.
Steve
#18 _CHOPPER_
Posted 10 April 2006 - 10:28 PM
#19 _revmaniac_
Posted 03 May 2006 - 12:25 PM
unless of course you get into oversteer then jump outta the throttle and it snaps back and spits ya nose first into said armco....i definately prefer a slight tendancy for the car to oversteer as it only takes a slight lift of the throttle to continue merrily along the way..whereas understeer requires a very deft use of the brakes and steering and generally washes off soooo much more corner speed....very hard to get natural oversteer in a torana with a locked diff though.....simply put, understeer is when the front hits the armco first, oversteer is when the backend hits the armco first!
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