C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Thumping when doing slow tight radius turns

Thread Tools
 
Search this Thread
 
Old 05-12-2019, 12:10 PM
  #1  
tjdismee
Advanced
Thread Starter
 
tjdismee's Avatar
 
Member Since: May 2019
Location: Itasca, Illinois
Posts: 84
Received 18 Likes on 13 Posts
Default Thumping when doing slow tight radius turns

I test drove a 2014 Z51 yesterday. I noticed that when doing a slow u-turn, or pulling out of a parking space with the wheel turned tight there seems to be a thumping sensation in the front end. It goes away when the wheel is straightened. I was told that that is the wide sticky tires causing this, not to worry. This is the only time I experienced this. Other than that the car handles beautifully and goes around turns like its on rails. Anybody else experience this?
Old 05-12-2019, 12:16 PM
  #2  
Kevin A Jones
Race Director
 
Kevin A Jones's Avatar
 
Member Since: Apr 2017
Location: Virginia
Posts: 12,820
Received 11,607 Likes on 5,563 Posts
Default

It's normal when wheels are turned to max. There's actually a name for it (or more what causes it) but it escapes me right now.

Last edited by Kevin A Jones; 05-12-2019 at 12:17 PM.
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 12:24 PM
  #3  
Mad*Max
Race Director
 
Mad*Max's Avatar
 
Member Since: Apr 2007
Location: Toronto, Canada
Posts: 15,943
Received 1,497 Likes on 816 Posts
C7 of the Year - Unmodified Finalist 2021

Default

My C7 does it way more than my C6 did.
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 12:27 PM
  #4  
V Vette
Le Mans Master
 
V Vette's Avatar
 
Member Since: Feb 2005
Location: Cape Coral, Fl
Posts: 5,350
Received 384 Likes on 271 Posts

Default

Originally Posted by Kevin A Jones
It's normal when wheels are turned to max. There's actually a name for it (or more what causes it) but it escapes me right now.
Tire chatter or wheel hop
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 12:38 PM
  #5  
Kevin A Jones
Race Director
 
Kevin A Jones's Avatar
 
Member Since: Apr 2017
Location: Virginia
Posts: 12,820
Received 11,607 Likes on 5,563 Posts
Default

Originally Posted by V Vette
Tire chatter or wheel hop
No, Ackerman Effect. I knew it would come to me.
The following 2 users liked this post by Kevin A Jones:
rogergcam (05-12-2019), tjdismee (05-13-2019)
Old 05-12-2019, 12:43 PM
  #6  
KenHorse
Team Owner
 
KenHorse's Avatar
 
Member Since: Aug 2007
Location: I live my life by 2 rules. 1) Never share everything you know. 2)
Posts: 136,148
Received 2,401 Likes on 1,366 Posts
St. Jude Donor '11-'12-'13, '16-'17-'18

Default

We REALLY need a sticky about this.
The following 2 users liked this post by KenHorse:
G8ME (05-12-2019), tjdismee (05-13-2019)
Old 05-12-2019, 01:10 PM
  #7  
phalse
Burning Brakes
 
phalse's Avatar
 
Member Since: Feb 2019
Location: San Diego
Posts: 1,090
Received 359 Likes on 239 Posts
Default

Mostly only does it when tires are cold. It's not even a Vette thing, not really. Mostly just a performance tires thing. Perfectly normal
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 01:12 PM
  #8  
Thunder22
Team Owner
 
Thunder22's Avatar
 
Member Since: May 2004
Location: Long Island
Posts: 31,243
Received 2,311 Likes on 1,456 Posts

Default

Ackerman Effect explained

http://www.mcgrathautoblog.com/autom...ette-stingray/
The following 2 users liked this post by Thunder22:
tjdismee (05-13-2019), Yaupon (05-12-2019)
Old 05-12-2019, 01:35 PM
  #9  
V Vette
Le Mans Master
 
V Vette's Avatar
 
Member Since: Feb 2005
Location: Cape Coral, Fl
Posts: 5,350
Received 384 Likes on 271 Posts

Default

Originally Posted by Kevin A Jones
No, Ackerman Effect. I knew it would come to me.


Also from our C7 manual

Last edited by V Vette; 05-12-2019 at 01:40 PM.
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 03:29 PM
  #10  
edzvet
Advanced
 
edzvet's Avatar
 
Member Since: Sep 2018
Posts: 66
Received 15 Likes on 12 Posts
Default

Mine stopped doing it when I switched to the Michelin A/S Run Flats
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 04:17 PM
  #11  
tjdismee
Advanced
Thread Starter
 
tjdismee's Avatar
 
Member Since: May 2019
Location: Itasca, Illinois
Posts: 84
Received 18 Likes on 13 Posts
Default

Thanks for the feedback!
Old 05-12-2019, 04:30 PM
  #12  
KenHorse
Team Owner
 
KenHorse's Avatar
 
Member Since: Aug 2007
Location: I live my life by 2 rules. 1) Never share everything you know. 2)
Posts: 136,148
Received 2,401 Likes on 1,366 Posts
St. Jude Donor '11-'12-'13, '16-'17-'18

Default

Originally Posted by edzvet
Mine stopped doing it when I switched to the Michelin A/S Run Flats
My PS3+ A/S do it but I have wider tires than you
Old 05-12-2019, 08:08 PM
  #13  
duckvett
Safety Car

 
duckvett's Avatar
 
Member Since: Nov 1999
Location: Green and Wet Western Oregon
Posts: 4,106
Received 909 Likes on 462 Posts
2023 C7 of the Year Winner - Unmodified
2018 C6 of Year Winner

Default

The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 09:35 PM
  #14  
Vetteman Jack
Administrator

Support Corvetteforum!
 
Vetteman Jack's Avatar
 
Member Since: Mar 2001
Location: In a parallel universe. Currently own 2014 Stingray Coupe.
Posts: 342,724
Received 19,234 Likes on 13,933 Posts
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-
'20-'21-'22-'23-'24
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran


Default

Perfectly normal. If you are looking to buy the car, don't let that issue be a reason for avoiding the purchase.
The following users liked this post:
tjdismee (05-13-2019)
Old 05-12-2019, 09:49 PM
  #15  
rogergcam
Pro
 
rogergcam's Avatar
 
Member Since: Jan 2014
Location: Earleton Fl
Posts: 566
Received 163 Likes on 89 Posts
Default "cold tires"

Originally Posted by phalse
Mostly only does it when tires are cold. It's not even a Vette thing, not really. Mostly just a performance tires thing. Perfectly normal
My tires do it all the time here in Florida. Even after a lot of driving when they cannot be cold. It's due to the difference turning radius of the inside, and outside of the tires in the turn.
The following 2 users liked this post by rogergcam:
retired08 (12-29-2019), tjdismee (05-13-2019)
Old 05-12-2019, 10:43 PM
  #16  
Kevin A Jones
Race Director
 
Kevin A Jones's Avatar
 
Member Since: Apr 2017
Location: Virginia
Posts: 12,820
Received 11,607 Likes on 5,563 Posts
Default

You must have missed the "what causes it" part of my statement, as in Ackerman Effect.

Originally Posted by Kevin A Jones
It's normal when wheels are turned to max. There's actually a name for it (or more what causes it) but it escapes me right now.
Originally Posted by V Vette


Also from our C7 manual
Old 05-18-2019, 01:30 PM
  #17  
phalse
Burning Brakes
 
phalse's Avatar
 
Member Since: Feb 2019
Location: San Diego
Posts: 1,090
Received 359 Likes on 239 Posts
Default

even though i knew what it was, i was mildy alarmed the first couple times =] its no big deal at all. figure out what tires you like (most dont like the oem tires too much, which are good but not great) and then just get on with life.

get out and drive.
Old 05-18-2019, 01:38 PM
  #18  
fsvoboda
Melting Slicks
 
fsvoboda's Avatar
 
Member Since: Sep 2013
Location: East Lansing, MI
Posts: 3,119
Received 795 Likes on 565 Posts
Default

Originally Posted by tjdismee
I test drove a 2014 Z51 yesterday. I noticed that when doing a slow u-turn, or pulling out of a parking space with the wheel turned tight there seems to be a thumping sensation in the front end. It goes away when the wheel is straightened. I was told that that is the wide sticky tires causing this, not to worry. This is the only time I experienced this. Other than that the car handles beautifully and goes around turns like its on rails. Anybody else experience this?
Everyone experiences this unless they change over to all season tires. It's a known feature, discussed here all the time by people surprised by it. Your owners' manual will describe.

Old 05-18-2019, 01:39 PM
  #19  
fsvoboda
Melting Slicks
 
fsvoboda's Avatar
 
Member Since: Sep 2013
Location: East Lansing, MI
Posts: 3,119
Received 795 Likes on 565 Posts
Default

Originally Posted by phalse
Mostly only does it when tires are cold. It's not even a Vette thing, not really. Mostly just a performance tires thing. Perfectly normal
Correct. My Dodge Charger also does it on certain surfaces.

Get notified of new replies

To Thumping when doing slow tight radius turns




Quick Reply: Thumping when doing slow tight radius turns



All times are GMT -4. The time now is 11:33 PM.