Wobbling, bouncing around - high speed cornering

zefaulter · 05-19-2016, 09:15 AM

Recently switched over to a new set of wheels with stock-size tires(stretched unfortunately).

19x9.5 +22 245/40/19
19x10.5 +22 275/35/19

Car handled great before the switch. It now feels extremely unstable on high speed cornering or highway "quick" lane switch. It feels like a ripple effect, car bounces right to left/left to right and I feel like I may spin out and lose control.

Recent changes other than wheels:
-Hotchkis Front and rear sways
-Whiteline Differential mount bushing

Any ideas?

TerribleONE · 05-19-2016, 10:13 AM

Are you feeling this in the rear? or the entire car?

zefaulter · 05-19-2016, 10:49 AM

Quote:

Originally Posted by TerribleONE

Are you feeling this in the rear? or the entire car?

Mostly in the rear of the car

Trips · 05-19-2016, 10:58 AM

I see you're on Hotchkis now and seeing that I've been on them for years.

Your problems are that the hefty front sway bar is making it more sensitive to road imperfections.

I noticed the road sensitivity myself But the trade off is the better lateral response on twistys.

Also the new tires need to break in so give them a few hundred miles.

In all there's nothing really wrong with the changes, But I would suggest getting an alignment to be on the safe side.

Oh and the those Hancrooks are for a dd so don't do anything serious with those tires or you're going to find out why their popular.

Because they're cheap!

zefaulter · 05-19-2016, 11:10 AM

Quote:

Originally Posted by Trips

I see you're on Hotchkis now and seeing that I've been on them for years.

Your problems are that the hefty front sway bar is making it more sensitive to road imperfections.

I noticed the road sensitivity myself But the trade off is the better lateral response on twistys.

Also the new tires need to break in so give them a few hundred miles.

In all there's nothing really wrong with the changes, But I would suggest getting an alignment to be on the safe side.

Oh and the those Hancrooks are for a dd so don't do anything serious with those tires or you're going to find out why their popular.

Because they're cheap!

LOL! But they were okay with stock wheels, in fact, everything was okay with stock wheels. they aren't new tires actually, pulled them from stock wheels.

I'm just worried something has gotten loose overtime

Boss_302 · 05-19-2016, 11:31 AM

I would give the air pressure a check too, Last time I had tires mounted the shop had the pressures all over all over the place, all was high. I would get an alignment done too,
be surprise how much of a difference it makes.

zefaulter · 05-19-2016, 11:58 AM

Quote:

Originally Posted by Boss_302

I would give the air pressure a check too, Last time I had tires mounted the shop had the pressures all over all over the place, all was high. I would get an alignment done too,
be surprise how much of a difference it makes.

I checked the pressure, all set to 35psi. I'll have to lift up the car and check everything

Slartibartfas · 05-19-2016, 02:23 PM

If the rear bar isn't at the softest setting, you should change to it. After you've done the other stuff. Also, your dampers may not be up to the Hotchkis bars.

40 to 332 · 05-19-2016, 03:19 PM

So it appears that everything remains the same except for the new wheels. Perhaps one or more of the wheels isn't properly balanced. I'd also check to ensure that the lug nuts are correctly torqued. Other than that I guess you could get under the car and check to ensure that nothing has loosened up ... but if the only thing that has changed is the new wheels, I'd start there.

nis350 · 05-20-2016, 02:43 AM

Are you running proper size hub rings with those wheels.

Make sure you are using the correct lug nuts with proper torque.

What kind of wheels are those? They could be out of round. You might also try road force balance.

Quote:

Originally Posted by zefaulter

Recently switched over to a new set of wheels with stock-size tires(stretched unfortunately).

19x9.5 +22 245/40/19
19x10.5 +22 275/35/19

Car handled great before the switch. It now feels extremely unstable on high speed cornering or highway "quick" lane switch. It feels like a ripple effect, car bounces right to left/left to right and I feel like I may spin out and lose control.

Recent changes other than wheels:
-Hotchkis Front and rear sways
-Whiteline Differential mount bushing

Any ideas?

Presto · 05-20-2016, 10:08 AM

Did you do an alignment with the new wheels? I bet your toe is off

zefaulter · 05-20-2016, 11:03 AM

Quote:

Originally Posted by Presto

Did you do an alignment with the new wheels? I bet your toe is off

I haven't done an alignment nope. Last time was Sept 2014

40 to 332 · 05-20-2016, 11:14 AM

Quote:

Originally Posted by nis350

Are you running proper size hub rings with those wheels.

Make sure you are using the correct lug nuts with proper torque.

What kind of wheels are those? They could be out of round. You might also try road force balance.

I agree. Check the wheel "stuff" first ... proper hub rings, lug nuts (correct type and torque), and balance.

zefaulter · 05-20-2016, 12:40 PM

Quote:

Originally Posted by 40 to 332

I agree. Check the wheel "stuff" first ... proper hub rings, lug nuts (correct type and torque), and balance.

these are Varrstoen ES9, they come in only 73.1 hub size. They gave me the new lugs so they "should" fit right. I torque the lugs to 95 ft-lbs.

I'll go talk to the wheel place see if they can verify the balance again.

zefaulter · 05-20-2016, 02:49 PM

Turns out I'll need hub rings

05-19-2016, 09:15 AM	#1 (permalink)
zefaulter A True Z Fanatic Join Date: Jan 2013 Location: Toronto, Canada Posts: 1,983 Drives: 40th 370Z Rep Power: 27	Wobbling, bouncing around - high speed cornering Recently switched over to a new set of wheels with stock-size tires(stretched unfortunately). 19x9.5 +22 245/40/19 19x10.5 +22 275/35/19 Car handled great before the switch. It now feels extremely unstable on high speed cornering or highway "quick" lane switch. It feels like a ripple effect, car bounces right to left/left to right and I feel like I may spin out and lose control. Recent changes other than wheels: -Hotchkis Front and rear sways -Whiteline Differential mount bushing Any ideas? Last edited by zefaulter; 05-19-2016 at 09:17 AM.

05-19-2016, 10:13 AM	#2 (permalink)
TerribleONE A True Z Fanatic Join Date: Jan 2009 Location: Socal Posts: 10,203 Drives: WOT Rep Power: 5850	Are you feeling this in the rear? or the entire car? zefaulter likes this. __________________ 638WHP 541WTQ @ 13.5PSI Build thread

05-19-2016, 10:58 AM	#4 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,730 Drives: 🔰 Rep Power: 10	I see you're on Hotchkis now and seeing that I've been on them for years. Your problems are that the hefty front sway bar is making it more sensitive to road imperfections. I noticed the road sensitivity myself But the trade off is the better lateral response on twistys. Also the new tires need to break in so give them a few hundred miles. In all there's nothing really wrong with the changes, But I would suggest getting an alignment to be on the safe side. Oh and the those Hancrooks are for a dd so don't do anything serious with those tires or you're going to find out why their popular. Because they're cheap! JARblue, DarkJak, zefaulter and 1 others like this. __________________ Last edited by Trips; 05-19-2016 at 11:01 AM.

05-19-2016, 11:31 AM	#6 (permalink)
Boss_302 Base Member Join Date: Feb 2013 Location: NY NY Posts: 150 Drives: 11 Nissan 370z S Mt Rep Power: 12	I would give the air pressure a check too, Last time I had tires mounted the shop had the pressures all over all over the place, all was high. I would get an alignment done too, be surprise how much of a difference it makes. cv129 likes this.

05-19-2016, 02:23 PM	#8 (permalink)
Slartibartfas Track Member Join Date: Apr 2016 Location: Houston Posts: 551 Drives: 2011 G37S sedan Rep Power: 10	If the rear bar isn't at the softest setting, you should change to it. After you've done the other stuff. Also, your dampers may not be up to the Hotchkis bars. zefaulter likes this. __________________ 2011 Journey Sport sedan 7AT \| SPL front, SPC rear camber arms \| ARK Grip cat-back \|

05-19-2016, 03:19 PM	#9 (permalink)
40 to 332 Enthusiast Member Join Date: Apr 2013 Location: Kimberley, BC, CANADA Posts: 447 Drives: 13 370Z BS M6 Sport Rep Power: 439	So it appears that everything remains the same except for the new wheels. Perhaps one or more of the wheels isn't properly balanced. I'd also check to ensure that the lug nuts are correctly torqued. Other than that I guess you could get under the car and check to ensure that nothing has loosened up ... but if the only thing that has changed is the new wheels, I'd start there. zefaulter and ChaseZ like this.

05-20-2016, 10:08 AM	#11 (permalink)
Presto Base Member Join Date: May 2010 Location: Home Posts: 123 Drives: Car Rep Power: 15	Did you do an alignment with the new wheels? I bet your toe is off zefaulter likes this.

05-20-2016, 02:49 PM	#15 (permalink)
zefaulter A True Z Fanatic Join Date: Jan 2013 Location: Toronto, Canada Posts: 1,983 Drives: 40th 370Z Rep Power: 27	Turns out I'll need hub rings

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