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Dialing out the understeer

PostPosted: Thu Dec 22, 2011 2:31 pm
by Doc
Afternoon Folks,

Just looking to see what is available to me (in stock form) on an 08 3R.B with respect to resetting the geometry.

I'm a little disappointed with the understeeer. I haven't RTFM yet, but it's playing on my mind.

Any little tips would be gratefully accepted.

Is camber F/R adjustable?

And does anyone have any somewhat more direct than standard geo settings that have proven themselves well. Would be especially interested to hear from anyone who tracks regularly?

Re: Dialing out the understeer

PostPosted: Thu Dec 22, 2011 3:00 pm
by Robbks
bigger (and solid) rear swaybar.

then zero the toe all round (even a little toe out on the front for better turn-in)
and almost 2' of camber on the front
this has made mine turn and handle much nicer

Re: Dialing out the understeer

PostPosted: Thu Dec 22, 2011 3:48 pm
by coyote
Move the engine back.

Re: Dialing out the understeer

PostPosted: Thu Dec 22, 2011 4:12 pm
by cruisn
coyote wrote:Move the engine back.


:lol:

Re: Dialing out the understeer

PostPosted: Thu Dec 22, 2011 4:39 pm
by stew07gt
cruisn wrote:
coyote wrote:Move the engine back.


:lol:


hmm a boxer engine in the boot, now that would be something...

Re: Dialing out the understeer

PostPosted: Fri Dec 23, 2011 7:54 am
by Doc
Robbks wrote:bigger (and solid) rear swaybar.
then zero the toe all round (even a little toe out on the front for better turn-in)
and almost 2' of camber on the front
this has made mine turn and handle much nicer


Thanks Rob.

2' camber on the front is a chunk. What do you do with the rear?

Re: Dialing out the understeer

PostPosted: Fri Dec 23, 2011 8:40 am
by Robbks
Doc wrote:
Robbks wrote:bigger (and solid) rear swaybar.
then zero the toe all round (even a little toe out on the front for better turn-in)
and almost 2' of camber on the front
this has made mine turn and handle much nicer


Thanks Rob.

2' camber on the front is a chunk. What do you do with the rear?


camber is fixed unless you change other components.
i haven't investigated what you need to do with the multilink rear end to get extra camber yet.

also, an ALK for the front is a good option aswell

Re: Dialing out the understeer

PostPosted: Fri Dec 23, 2011 11:27 am
by Doc
ALK?

Re: Dialing out the understeer

PostPosted: Fri Dec 23, 2011 12:14 pm
by hamish_023
Anti Lift Kit

Re: Dialing out the understeer

PostPosted: Sat Dec 24, 2011 9:46 am
by BJ
To decrease understeer increase rear stiffness, ie bigger rear anti roll bar.

Re: Dialing out the understeer

PostPosted: Tue Dec 27, 2011 10:59 pm
by Doc
So an ARB and a GEO reset.

Ok, thanks guys.

Re: Dialing out the understeer

PostPosted: Wed Dec 28, 2011 12:45 am
by kiks
BJ wrote:To decrease understeer increase rear stiffness, ie bigger rear anti roll bar.

Negative.

Decreasing rear end grip is not removing under steer.

All changes should be made against the clock. A bigger anti roll bar in the rear is not faster. It just feels faster and is more snappy... So slow and loose. The rear bar rate does nothing to load the front tyres when increased.

Want to rid all under steer you need a wholistic approach.

A proper 'steer' tyre on the front. Federal 595rsr is the best value for money. I'm trying AD050 yoko's next.
Up the rear spring rate to about 6kg with stock fronts and remove the front sway bar completely.
Make new strut tops and aim for about 8 deg of castor. Using the factory bearings in a sandwiched heim joint would do fine. Ghetto pillowballs.
1.5 to 2deg neg camber in the front. 1 on the rear is heaps.
3mm toe out on all corners.

Replace every bush in the car with alloy or urethane.
Solid mount the rear subframe, diff, gearbox supports.

Once you start making power replace all 3 diffs. Once done you can add a front swaybar again. Until then it only serves to tripod the car keeping wheels off the ground.

With the above you'll our steer just about anything with a rego plate. You will also get 4-5k's max from a set of front tyres. Zero toe in the rear will stop the tram lining a little. Front toe out is needed. At least a mm.

Stock geometry is amazing at stock height. Stiffer rear also introduces some anti squat which helps corner exit front end grip a huge amount due to the stock dynamic toe.

Stock bilsteins are not valved hard enough as is.... Look at a proper set of shocks. Ohlins, dms etc.

Re: Dialing out the understeer

PostPosted: Wed Dec 28, 2011 12:47 am
by kiks
And remember with no understeer there is no grip. It's a fundamental requirement of physics to exist.

Re: Dialing out the understeer

PostPosted: Wed Dec 28, 2011 12:59 am
by seanmau5
stew07gt wrote:
cruisn wrote:
coyote wrote:Move the engine back.


:lol:


hmm a boxer engine in the boot, now that would be something...


A 911!!

Re: Dialing out the understeer

PostPosted: Wed Dec 28, 2011 7:58 am
by stew07gt
Lib_seanmau5 wrote:
stew07gt wrote: hmm a boxer engine in the boot, now that would be something...


A 911!!


Well im glad someone understood my joke