guys help me out how can i get rid or the understeer on my z

 

Understeer > Oversteer heh.

Add more gas.

 

+1. Its called powered oversteer. Give it a go. And by the way, how hard do you push the Z to get understeer on it!?

 

You could go with larger front tires or a good set of Hotchkis swaybars.

 

After plowing around an autocross with understeer as well, I switched to Falken Azenis P245/45ZR17s on all four corners and it was considerably better when I AutoX'd last weekend. There was moderate understeer in slow sharp corners, but it was very easy to rotate and I had no problem getting sideways...not that it helps for AutoX.

Run a grippy (Azenis, Potenza S03, G Force KD etc) *equal width* tire all the way around for starters, and if you want more, try adding a Hotchkis or 350EVO.com rear sway bar.. that should do it.

 

S-Tune suspension with S-Tune sways. Not sure exactly which one "cured" the understeer since I had them both installed at the same time, but I have a very neutral steering car now.

 

I say +1 on the S-Tune suspension w/S-Tune sways.

I've heard but I'm not sure if it is true, that the Z stock set-up has similar cornering dynamics to a 911. If that is so, that means giving the Z more throttle in the first part of the turn will induce even more understeer which would be bad for a car that has mild understeer built in. Easing off the throttle in the first part of the turn would cause enough oversteer to bring the front back in line. I think it was set-up this way for inexperienced drivers because understeer is easier to correct than oversteer. Correcting oversteer in a rear wheel drive car usually requires adding more throttle to the rear wheels which is counter-intuitive to most people. Many people would probably panic and brake to correct the oversteer which would make oversteer in a rear wheel drive car worse. Correcting understeer would require less throttle to the rear wheels and/or braking which is what an inexperienced driver would most likely do if they came into the corner to hot. When exiting the turn, I think the Z is nicely balanced for just powering its way out.

 

All the road race cars are set up to understeer rather the to oversteer becuase in case of understeer the front tires are loosing grip before the back tires which helps to correct the car faster by being patient and easing off the throttle. That of course if you are going for the fastest time through the corner. Basically you have to be patient. I curred this problem by going to the autocross school. In the beginning of the day the car oversteered like crazy, but then as I learned to be patient (and some other technics) I picked up about 3 second on the 35 second course.

P.S. I think somewhere on the formula one website you can find some more description why the car looses less time understeering rather then understeering.

 

So, what you are saying here is slow down more going into the turn, and power harder comming out?

Does that correct the understeer problem?

 

Yes, that's pretty much it. I mean there are lots of variables but assuming that you have a long straight before and after the turn that would probably be the altimate way to go through a turn. You want to add power as you hit apex (sometimes even before) it just all depends on so many things that there is no one right way to do it. If you road racing you want to have the top speed at the end of the straight, if you autoxing Solo 2, depending on the course you might want to take a tighter line rather then add more power and drift wide on the exit. As a general rule for people who I taught how to drive (noobs mostly) I say that you need to break in the straight line before the turn and be in the gear that you will take the turn in. Keep the momentum through the first half of the corner and then "slowly" add power. You don't want to slam on it because if you are at your limit alreay you will loose traction and time to recover. Add power gradualy as you unwhind the wheel. Sorry for the rant, there is just no simple way to explain it and I could go on and on ... .

 

I ran 245/40/18's on all four corners and it helped a bunch.
I can still get it to understeer if I come in to hot. What I do is tap the brakes during the turn to shift the weight to the front tires so they can grip and it will rotate the rear end. I usually tap the brakes just long enough to point the car in the directions I want to go.

 

yeah, understeer > oversteer

much easier to recover from an understeer

 

Of course if you enter a turn slower you will not understeer. You will not be surpassing the maximum amount of traction your front tires can give you. You can increase the amount of traction of the front tires by either loading the tires more or get tires that offer more grip.

 

Turn VDC back on. (Just kidding)

 

No, not necessarily. If you enter a corner to slow it will hurt you coming out of the corner. Your car can only accelerate at a certain rate. For example you enter a corner at 30 mph and can accelerate to 50 mph at corner exit your car can only accelerate 20 mph in that corner. If you enter the same corner at 15 mph you will only be at 35 mph at corner exit. So you want to be at the maximum speed entering a corner and carry it through the whole turn. There are some exceptions to the rule. You might have to sacrifice some corners to enter another on a good line. For example you might have a turn that leads to another turn that leads to a long straight. You would want to sacrifice the first turn to get the second turn correct so that you enter the straight at the fastest possible speed.

 

+2 on the Nismo S-tune. Also, different tire combo (255/275) can help.

and, +1 on the slow in/fast out cornering technique. The Z is a really well balanced car and responds well to a bit more finess

 

You could also practice your trail braking and left foot braking.

 

Hi 350Zteve,
Your car looks cool. What tire ure using? is it 19 /9.5 ??" and lowered? Looks like you have big size tire on both front and rear.
I am trying to figure what size should I change on my Track.
Thanks in advance.

 

Guys,

I am a newbie to this. Whats an understeer and oversteer? I am guessing that an understeer means that you have to apply more to the steering in order to direct the turn?

Expain please in simple term.

Thanks,
Tony

 

Any rubbing in the front with 245's? Will that combo work on Z's with traction control?