too much understeer now!

vortrex

I put 9x19 and 9x11 wheels with 255/35 and 295/30 hankooks with eibach springs and now have too much understeer. the alignment specs post spring install show -1.3deg and -1.4deg camber in the front.

can I get more negative camber out of the front with the stock bits? if so, what is suggested to relieve the understeer based off the tire sizes I am running? also, at what point do I start getting tire wear because of too much negative camber?

would sway bars help my situation at all?

thanks.

zero

Stiffer rear sway bar will help.

__________________

Jordo!

You could also try removing the front strut bar.

__________________
Enjoy it. Destroy it.

travisjb

could also run a couple psi more tire pressure in the rear... some combination of the above... curious why you went with such small tires on the front

__________________
2009 370Z #104
*For Sale*

djpathfinder

Strange, when you lower the car you automatically get more negative camber. In the front that should give you better turn in. You can get a front camber kit to add more negative camber in front...closer to -2.0.

I wouldn't remove the front strut tower bar. Reducing structural rigidity is not the answer.

__________________
2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD

vortrex

I do run a couple more psi in the rear.

255/35's are a perfect fit for the 9" wheel.

vortrex

I think the problem is strictly do to the tire size ratio between front and rear. there's just too much in the rear, which makes the front push. I'll probably just get a camber kit I guess.

Jessobear

Did you change the offset significantly? Changing the track, especially if you didn't change it evenly in the front and back, may have affected your handling.

ChrisSlicks

The 2 inch wheel width stagger is doing you in.

Increase front camber to -2.0 degrees using a camber kit. You'll go through tires a little faster if you do a lot of highway but it won't be that bad. Sway bars would probably only make it worse as pretty much all the aftermarket kits increase the front bar stiffness more than the rear. You could also try widening the front track by adding front spacers or narrowing the rear track by removing spacers if you used any there.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

kenchan

yah, wat offset are you running? your rear might be pushed out too far vs your front.

vortrex

running 19x9 +24 front, 19x11 +23 rear offsets. I think this is the most aggressive fit you can get from forgestar. I too think it's more of a issue with 9" in the front and 11" in the rear and the resulting tire width differences. I'm just wondering if a camber kit can help this if I went to -2.0? I do commute a lot in this car, 70 miles per day.

ChrisSlicks

I have the Forgestars but I have the 10" wheels up front, 11" in the rear.

What are you running for tire?

When do you experience the understeer, is it turn-in or mid corner?

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

vortrex

I don't think they make a 19x10 wheel anymore.

I have the Hankook V12 tires.

understeer is turn-in, really all the time. I just feel all the weight of the car on the front wheels and in the steering. it pushes a lot.

m4a1mustang

More negative camber up front should help with the turn-in, but really it's going to be difficult to overcome that amount of tire stagger. Ideally you would maintain the OEM ratio or decrease it.

FWIW, you can fit up to a 275 width tire on a 9" wheel.

You could also leave the OEM sway bar up front and run a stiffer rear bar, but that will mostly help center-off.

__________________
- Steve

Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!)
LIKE us on Facebook!

s30z

I think you should change the tire size to one of these combo.

F 255-40-19 R 285-35-19

or

F 275-35-19 R 305-30-19

I prefer the first one since 2nd combo is way too much in my onpinion for the stock setup and power.
Generally speaking, if you over size the tire too much, you might get a nicer look, but you not only eat at your power but it can also tend to numb the feel of the vehicle.