Oversteer in right hand turns
 

I spent the weekend at Sebring and had a very scary moment where I about ate a wall because of oversteer. It was in turn 16 a right hand turn at around 60-70 mph. The car suspension is all stock with BFG G-Force comp 2 tires. I know down force would help but I'm looking for suspension or sway bar recommendations that would help with understeer? My instinct wants to change it all but this is the first car I have tracked and I don't want my lack of knowledge to make the oversteer worse.

What's your alignment look like? Start with the low hanging fruit.

I had it done not long ago, it's within factory specs.


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That covers a lot of ground, unfortunately. How hot were your tires? Did it only occur on right turns?

Yes but most of the hard turns are right hand at Sebring. I only lost it once bad but it tried to come around several times.


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I'd have someone take a look at rear toe just to rule that out.

Also, are you on the stock VLSD?

Yes whatever comes in a touring without the sport package.


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I will have the toe checked out.


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No VLSD

Ok, then you've got an open diff in the back. Without the sport package, you don't get a lsd. That's no bueno since you've got a lot more power than stock.

Is the snap oversteer new, or has it happened every time you've tracked it? Is there a chance it could be related to throttle control? Sorry for all the questions, but your question is kind of broad. It's like trying to diagnose a noise over the internet. :rofl2:

No? I didn't realize that.


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Is the oversteer happening under braking, or mid turn, or under acceleration?

Tracy Ramsey

It's new but this was the first time on the track boosted. I'm sure I'm part of the problem, the extra HP was a handful!


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Nope. No sport pack, no LSD. That would be the next thing to change if I was in your shoes.

Another good question. :iagree:

Under acceleration and it happened fast! I came within a foot of painting a wall yellow!


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Any recommendation on a LSD?


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Unless something comes back wacky on your alignment, I'll go with "tires breaking loose around 5k rpm for $200, Alex". :rofl2:

I've got the same issue. Even at part throttle, when you start getting into the meaty part of the powerband, the tires will break loose. How much throttle did you give it? Mine is a lot more "point and shoot" after boost than it was before.

New extra power, no LSD, stock suspension says to me heavy right foot...especially if it seems to be happening out of the "hard" corners. IF I were your instructor, I would say to you...

"pretend that there is an egg under your throttle pedal, and you want to just squeeze that pedal...try not to break that egg. Save your throttle mashing for when you are in a straight line"

Tracy Ramsey

Oversteer in right hand turns
 

I was squeezing into the gas but I was unwinding the wheel. I was no where near hard throttle but obviously it was to much. It felt to me like it broke loose when the tires weren't making much noise.


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How many laps/miles on the tires? How hot were they?

Chuck my car does hit boost hard at 4500 and that's about where I was.


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3rd lap of the weekend and they had only done one weekend. The track had been wet that morning but it looked 100% dry. The track was cool and it was on the concrete section.


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Yeah, I'm leaning toward a learning experience that you have a whole hell of a lot more power than you think. Get a good diff and give it another shot. Hell, get a stock VLSD off someone. Even that's better than nothing.

Any brand you recommend ?


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I'm not gun shy about spending money, I just want it right.


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Sebring is a very bumpy track and it is easy to unsettle the car there. I wouldn't make any changes until you get more track time. However, if you really want to do something before you go out again, try a larger front swaybar, like the Eibach, which will reduce oversteer.

I'm still using the VLSD. Go look in the track subforum. There's some really smart guys in there.

Another question- what size tires are you running? Not the 245s on the non-sport 18s, right?

The are the stock sizes.

So 245s in back? That's not enough rubber for stock power, much less 100whp over stock.

my question exactly.

could be just driver error... free to fix. i would also try different tires.

Yes 245s, what are you running on the rear?

I had no idea Nissa had an open diff in the touring, thanks for the info! 400 HP and an open diff can't lead to anything good, that will be fixed ASAP.

Sport wheels come with 275s, Nismos with 285s. You need more rubber.

There are all kinds off driver problems to deal with but there is something else to this also. I'm not afraid to admit I'm learning but the back end shouldn't be this twitchy. I watched a Porsche GT3 cup car destroyed sliding down a wall this weekend and I don't want to be that guy!

Agree'd. More rubber will help out without installing a LSD. I think the best idea would be to pick up a good aftermarket LSD or swap in a Stock one if possible (used to do that on E36's back in the day).

They are both on 19s right? My rears are about done so I will look into getting more. Thanks again Chuck and everyone else who offered advise!

You've got 18s. Sports have a 19x10 rear, Nismos 19x10.5. If you're buying new wheels, a 19 is an annoying size. You don't have as many options. A set of 18x10 all around would do you just fine with appropriate tires.

Thanks Mark! After speaking to you Saturday everything went perfect the rest of the weekend, thanks again!

Great, I hope you don't mind me telling the wife you told me to do it! I live by it's easier to ask for forgiveness than permission but she doesn't find it funny!

Did you stay on power when it broke loose or lift? 370z have natural intial wag that catches if you stay on power. If you lift with rear end moving it will swing even harder. Big front bar will help you.