Author Topic: Where would you look to correct snap oversteer on Braking?  (Read 3443 times)

[SJ]georgec5614

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Where would you look to correct snap oversteer on Braking?
« on: October 26, 2007, 07:06:58 pm »
I hope you can give me some hints on what to look for to correct the condition.  I have a problem keeping the car under control when I coming to the end of long high speed straight I start to press on the brake and the car steers to one side or the other like I had turned the wheel.  Does anyone know what I can look at to try and correct this?  When I look at the replay it does not 'appear' that the tires are locking up so I can't really tell wether the fronts are locking first or the rears.  Any help would be most appreciated wether it is setup help, or driving technique.

Thanks

[SJ]Swordy

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #1 on: October 26, 2007, 07:08:19 pm »
Brake Bias.....Try 65% front :nose:

[SJ]Nailz

  • Sleuth
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #2 on: October 26, 2007, 07:19:12 pm »
check your differential lock too, the coast setting...

[SJ]Swordy

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #3 on: October 26, 2007, 07:20:03 pm »
check your differential lock too, the coast setting...


And that too....... :innocent:

[SJ]DaveGardner

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #4 on: October 26, 2007, 07:24:47 pm »
which game and in particular which car???

Dave

[SJ]Jarkko Rantajoki

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #5 on: October 26, 2007, 07:35:53 pm »
Raising coast up will make it more stable under braking, setting brake balance more front can help.. also it might be that you just have too sensitive steering, so depending on your wheel you might want to change the degree of turn from the wheel control panel, or then drop the steering lock down a bit. Maybe you downshift too quick? How the car handles on the corner exit? If its a FWD you might accidentally hold too much throttle, therefore causing the rear brakes to grip much more than fronts (causing similar effect as very rear brake balance would do).

[SJ]Peter Enqvist

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #6 on: October 26, 2007, 07:38:18 pm »
If it's happening during downshifts, then try blipping the throttle at the same time as braking when you shift down.

[SJ]JuneBug

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #7 on: October 26, 2007, 08:55:53 pm »
I know with certain mods the force feeback needs a negative setting but if that were the case you would notice the wheel turning left/right on its own everywhere...

Not much help here, everything else I can think of has been said...

 :idea: Whats your engne brake map set to?

[SJ]Pierre61

  • Master of Ceremonies
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #8 on: October 26, 2007, 09:17:29 pm »
This used to be the bane of my life... it was too much rear brake bias with me.

[SJ]georgec5614

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #9 on: October 27, 2007, 04:40:29 am »
Thanks for all the suggestions.   I am using GTL and it happens with the mini, and the capri. 

Adjusting the brake bias toward the front helped a lot.  I can now keep the car on the track coming into turn one at Lime Rock  :biggrin:

The coast setting is at 30 and the power is at 40 in the mini.  I have tried increasing it a little but did not see any change so I think I will leave it there for now.

Keeping a little throttle on during down shifting makes a difference as well, at least with the mini's.

Again thanks for all the help!!

George

[SJ]Dion Holzheimer

  • Graduate of Alien U.
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #10 on: October 27, 2007, 04:54:28 am »
This used to be the bane of my life... it was too much rear brake bias with me.


Bingo.. Biggest cause IMHO.

[SJ]HPI-rcr

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #11 on: October 27, 2007, 03:29:53 pm »
I have found that, if you drop your brake pressure, about 10% and set bias forward, and the affore mentioned coast setting higher, works well, too.

Now, keep in mind, if you drop your brake pressure, you will be able to steer thru better, but, DON"T Forget, you will need to apply them SOONER!!!!!

LOL


SJ_HPI-rcr
Jeff

[SJ]T Hez

  • Yoda of Alien U.
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #12 on: October 27, 2007, 04:23:59 pm »
Like mentioned: move brake bias to the front (adjust pressure only if needed) and raise differential coast value.
In addition you could also try to raise the front damper bump value...
Also try to blip the throttle whilst downshifting. Not only will this prevent the tyres from locking up (under heavy engine braking that is) but it will also allow you to control the weight shifting while entering a turn much better. This results in higher corner entry speed (right until the apex).

[SJ]Bruce Brown

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #13 on: October 30, 2007, 07:10:29 pm »
you can also add a little rear toe--- you can raise your rear ride height a click or 2.. you can lower your engine brake(raise the number lowers the effect-but this can be mod specific so check with your mod)... Move some weight forward.. you can add a bit of front spring(if you have one)... and you can always add a click or two of rear wing.. But the rear coast diff is the first thing i head for ... the higher the number the more stable with entry into the corner.. But if its happened on downshits... then also try bring those last few gears closer together.. If there is too big of a jump from gear down to another.. spin city..

[SJ]T Hez

  • Yoda of Alien U.
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #14 on: October 30, 2007, 07:23:28 pm »
Could you explain what good raising the rear ride height would do to stop the rear going loose under braking?
To me it makes more sense not to shift more weight to the front (under braking) as it would make the rear even "lighter"/more unstable.

[SJ]dirtyvfr

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #15 on: October 30, 2007, 09:27:43 pm »
well raising the rear of the car is a way of changing the castor angle, if you don't have any adjustment of the front end, it's a common thing to do in bikes but you'll know that and a way to increase castor in road cars.

for the mini try as other have said in the posts,

but find a track you know and do a few tests,

maybe even go a bit extreme and radical,

move the brakes all the way to the front, see what it feels like, then reduced the brake pressure a bit, run max fuel and see what that does

then move the brakes all the way to the rear and try that

then try max coast,

0 % coast = max lock up, more throttle control when you lift

100 % coast = free wheeling, less throttle control when you lift

there is a very good GTR2 setup guide kicking about on the net, somewhere.


 


 

[SJ]Stein

  • "The Watchdog"
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Re: Where would you look to correct snap oversteer on Braking?
« Reply #16 on: October 31, 2007, 04:13:07 pm »
Tapping the throttle as you shift down the gears helps alot to make a straight line braking manouvre... but i read something about mini's
The "throttleblipping" as above action is called helps to keep cars with rearwheeldrive in check.


Hope it makes sence to you.


Woof ~ Woof


[SJ]JuneBug

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Re: Where would you look to correct snap oversteer on Braking?
« Reply #17 on: October 31, 2007, 07:14:20 pm »
I found that having 'Combined Axis for Throttle and Brake' turned on really made it difficult to brake from high speeds smoothly and resulted more often than not in the car swapping ends.

Have a look for this setting, if its on try turning it off, you will have to re-assign your pedal mappings but it makes a world of difference, like I can now trail brake correctly  :)