lateral stability problem

TKomodo · 10-20-2012, 06:20 PM

I upgraded my base '12 to 19x9.5 front & 19x11 rear wheels with 255 35 front tires & 305 30 rear tires. At speeds above 40 I notice a great deal of lateral movement. I have work to keep the car straight. It feels like I am riding on marshmellows, really spongy from side to side.. The tire pressure is @ 50psi. Anyone experience this after going with bigger setup?

2004YZFR1 · 10-20-2012, 06:26 PM

That is a really high tire pressure for one thing. Lower your pressure to 35 and then take it for a ride. Also if you have brand new tire it takes a while to wear the mold release off the tires.

Then let us know how it feels. Also what tires did you buy?

DR_ · 10-20-2012, 06:34 PM

I bet it is the tires. What kind of tires did you get??

Trips · 10-20-2012, 06:39 PM

Quote:

Originally Posted by 2004YZFR1

That is a really high tire pressure for one thing. Lower your pressure to 35 and then take it for a ride. Also if you have brand new tire it takes a while to wear the mold release off the tires.

Then let us know how it feels. Also what tires did you buy?

TKomodo · 10-20-2012, 06:43 PM

Hankook v12

TKomodo · 10-20-2012, 06:52 PM

Usually you increase pressure to reduce lateral roll, but I''ll take your advice and lowerthepressure to 35.
Thanks for the response, I'll update in a few days

DCNISMO · 10-20-2012, 08:49 PM

50 psi cold? Thats way too high. When they get warm thy must be hitting 60 or so. That's dangerous. I run 36 all around on my PSS tires. That's cold pressure.

Ubetit · 10-20-2012, 11:26 PM

50 psi is way too high. You stiffened the crap out of the tire and reduced the contact patch. No wonder your car has a lateral stability problem. Over-inflation can provide crisper turn-in and handling to a point but you've over done it.

KiwiNismo · 10-21-2012, 01:42 AM

As stated above, you have reduced your contact patch. Found this online.

http://static.ddmcdn.com/gif/tire-problems.jpg

Chan Chee Hoe · 10-21-2012, 01:54 AM

50psi.??I put 40 psi,all my friends[even tyre shop] already said i am crazy.!

Ubetit · 10-21-2012, 08:54 AM

Quote:

Originally Posted by Chan Chee Hoe

50psi.??I put 40 psi,all my friends[even tyre shop] already said i am crazy.!

It's possible 40 works and would be helpful at an autocross, i'm not sure why it would be needed crusing the streets. Over inflation can happen with as little as 2 psi.

TKomodo · 10-21-2012, 09:26 AM

Initially the tires had 40psi. Max inflation for that tire is 50psi.

red6spd · 10-21-2012, 09:39 AM

Where did you get the PSI number from? Why did you decide on that?

edub370 · 10-21-2012, 11:18 AM

Its fine. Its just the new tires having break free grease from the mold still on them. That combined with the higher tread depth (which will allow more tread flex (will give a more spongy feel at first. Give it a couple hundred miles and it will go back to like it was. I had the same issue and is definitely an odd feeling

sloppy handling characteristics after tire change

TKomodo · 10-21-2012, 03:48 PM

Red, typically to stiffen up tires, you add pressure. The tires are rated to 50psi. In this case it made the problem worse. I did what others mentioned and dropped the pressure. I'm at 31 psi and it made all the difference. Thanks for the good advice

10-20-2012, 06:20 PM	#1 (permalink)
TKomodo Base Member Join Date: Dec 2011 Location: Houston Posts: 197 Drives: 2011 370z Sport Rep Power: 14	lateral stability problem I upgraded my base '12 to 19x9.5 front & 19x11 rear wheels with 255 35 front tires & 305 30 rear tires. At speeds above 40 I notice a great deal of lateral movement. I have work to keep the car straight. It feels like I am riding on marshmellows, really spongy from side to side.. The tire pressure is @ 50psi. Anyone experience this after going with bigger setup?

10-20-2012, 06:26 PM	#2 (permalink)
2004YZFR1 Enthusiast Member Join Date: Apr 2010 Location: Las Vegas Nevada Posts: 308 Drives: 09 370Z yellow,auto Rep Power: 15	That is a really high tire pressure for one thing. Lower your pressure to 35 and then take it for a ride. Also if you have brand new tire it takes a while to wear the mold release off the tires. Then let us know how it feels. Also what tires did you buy? __________________ K & N Filters \| HPS silicone air intakes\| Fast Intentions CBE with 18" resonators \|

10-21-2012, 09:39 AM	#13 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,277 Drives: 2010 Z Coupe M6 SPT Rep Power: 21	Where did you get the PSI number from? Why did you decide on that? __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time)

10-21-2012, 11:18 AM	#14 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	Its fine. Its just the new tires having break free grease from the mold still on them. That combined with the higher tread depth (which will allow more tread flex (will give a more spongy feel at first. Give it a couple hundred miles and it will go back to like it was. I had the same issue and is definitely an odd feeling sloppy handling characteristics after tire change __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

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10-20-2012, 06:34 PM	#3 (permalink)
DR_ Track Member Join Date: Jul 2009 Location: Dallas Posts: 981 Drives: Touring/Sport M6 PG Rep Power: 17	I bet it is the tires. What kind of tires did you get??

10-20-2012, 06:43 PM	#5 (permalink)
TKomodo Base Member Join Date: Dec 2011 Location: Houston Posts: 197 Drives: 2011 370z Sport Rep Power: 14	Hankook v12

10-20-2012, 06:52 PM	#6 (permalink)
TKomodo Base Member Join Date: Dec 2011 Location: Houston Posts: 197 Drives: 2011 370z Sport Rep Power: 14	Usually you increase pressure to reduce lateral roll, but I''ll take your advice and lowerthepressure to 35. Thanks for the response, I'll update in a few days

10-20-2012, 08:49 PM	#7 (permalink)
DCNISMO Track Member Join Date: Nov 2011 Location: washington dc Posts: 995 Drives: Nismo Z Rep Power: 179	50 psi cold? Thats way too high. When they get warm thy must be hitting 60 or so. That's dangerous. I run 36 all around on my PSS tires. That's cold pressure.

10-20-2012, 11:26 PM	#8 (permalink)
Ubetit Track Member Join Date: May 2012 Location: Ohio Posts: 527 Drives: the women lazy Rep Power: 14	50 psi is way too high. You stiffened the crap out of the tire and reduced the contact patch. No wonder your car has a lateral stability problem. Over-inflation can provide crisper turn-in and handling to a point but you've over done it.

10-21-2012, 01:42 AM	#9 (permalink)
KiwiNismo Base Member Join Date: Aug 2012 Location: CA Posts: 22 Drives: 2012 Nismo cruiser. Rep Power: 13	As stated above, you have reduced your contact patch. Found this online. http://static.ddmcdn.com/gif/tire-problems.jpg

10-21-2012, 01:54 AM	#10 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 17	50psi.??I put 40 psi,all my friends[even tyre shop] already said i am crazy.!

10-21-2012, 09:26 AM	#12 (permalink)
TKomodo Base Member Join Date: Dec 2011 Location: Houston Posts: 197 Drives: 2011 370z Sport Rep Power: 14	Initially the tires had 40psi. Max inflation for that tire is 50psi.

10-21-2012, 03:48 PM	#15 (permalink)
TKomodo Base Member Join Date: Dec 2011 Location: Houston Posts: 197 Drives: 2011 370z Sport Rep Power: 14	Red, typically to stiffen up tires, you add pressure. The tires are rated to 50psi. In this case it made the problem worse. I did what others mentioned and dropped the pressure. I'm at 31 psi and it made all the difference. Thanks for the good advice