Zonda C12 Understeer

  • Thread starter Rue
  • 33 comments
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Well, I haven't gotten far enough in the game yet to be able to afford a Zonda, BUT--

If the problem is chronic, terminal understeer, then I have some solutions based on real-world tuning.

It is likely that the Zonda, like many super cars -- is under-tired up front. This is largely for safety reasons. You would much rather have a powerful car understeer, since an average driver's natural reaction is to apply brakes --exactly the thing to do to fix an understeer situation. Under power, everything shifts to the rear, and the skinny front tires don't help turn the car much.

Since you have absolutely NO control over tire size at all in GT3, a potential solution is to mix tire grades. Try ...

TIRES
-Super soft FRONT and perhaps
-Medium REAR.

On the suspension side, try...

SPRINGS
-Increasing REAR spring rate
-Decreasing FRONT spring rate

SHOCKS (dampers)
-Increasing REAR shock jounce (bound)
-Decreasing FRONT shock jounce

(You will need to "match" spring and shock rates, something very important for real cars.)

SWAY BAR (anti-roll)
-Increase REAR sway bar stiffness
-Decrease FRONT sway bar

CAMBER
-Increase FRONT negative
-Decrease REAR negative


These are real life suspension tuning guidelines for cars with understeer tendencies. These setting should produce a car that is more neutral in transient turning. It should also have much greater response while trail braking. Under throttle, I suspect it may be pretty loose, so be careful coming out of tight turns.

The most important aspect will be spring and shock tuning. Since the Zonda is a mid-engined car, you will need to set the rear springs and shocks to be very stiff. Make it as stiff as you can stand it in the rear, then slowing start reducing front stiffness until the car is more neutral. This may give the car a tendecy to be jittery... unfortunately that will be the trade off.

In addition, consider turning OFF stability and traction control. I have noticed that stability control will always make 'understeery' cars even more so. The car will probably be a handful without the aids turned on, but will rotate much better,

Finally, you will need to adapt your driving to suit the car. Brake early and use LOTS to trail braking to get the car rotated as early as you can in the turn, then roll on the throttle gentlely to rocket out.

Good luck with it.


///M-Spec
 
Hello, M-Spec, and welcome to GT Planet! Nice to see more users who understand suspension tuning and the reasoning behind the choices to be made. Not to mention someone who is capable of putting together a clear post that actually contributes to the general understanding of the rest of the users.

Welcome aboard. I hope you enjoy a long and fruitful stay here!
 
Thanks for the warm welcome, Duke. This site is a very nice resource to have.

I just picked up my PS2 a few weeks ago (yes, I know I've been under a rock for the last 2 years :lol: ) and I'm please to see what a great job they did on GT3.

There already lots of good stuff in here and I hope to contribute to it in the future.


///M-Spec
 
Yeah, that was a great post, M-Spec!

I actually saved it on my computer for future reference (unfortunately I'm in the middle of exams and I can't play *whimper*). But there is light at the end of the tunnel in 5 days =D

I've been having a problem with snap oversteering in the Toyota GT-One. As in, I keep oversteering when I'm even halfway on the throttle with Stage 2 turbo, and softening the rear springs only make it an understeering situation.

I'm going to try the REVERSE of what you prescribed for the Zonda and see if it works =).
 
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