C7 Z06 Discussion General Z06 Corvette Discussion, LT4 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
Sponsored by:
Sponsored by: GEM Motorsports

Why do C7 Z06's pull to the right violently when breaking loose...WTF

Thread Tools
 
Search this Thread
 
Old 10-28-2016, 07:11 PM
  #1  
RussC243
Instructor
Thread Starter
 
RussC243's Avatar
 
Member Since: Apr 2016
Posts: 103
Received 18 Likes on 13 Posts
Default Why do C7 Z06's pull to the right violently when breaking loose...WTF

Saw lots of videos/threads of people wrecking their new z06's so I am being careful. After my 500 mile oil change I got on it about 10 times today in 1, 2 and 3rd. Never rung it out as I will hold off on that untill about 2k miles.

In 1st the wheels break loose and the car just slides along straight as expected. In 2nd and 3rd, it violently jerks to the right. I let off it right way and the car jerks straight again.

My old supercharged c4 broke loose in 1st, 2nd and 3rd and I could floor it as much as I wanted and it continued to track straight while the wheels were slipping. It would get squirrelly at the top of 3rd at 100 mph but I could just correct with steering and stay on it. Done it a million times with the c4.

The c7 is asking to wrap itself around a tree. I am in touring mode it that matters

This is not right!!

Edit: I was on an empty private road.

Last edited by RussC243; 10-28-2016 at 07:21 PM.
The following users liked this post:
Kimonord (02-21-2017)

Popular Reply

10-28-2016, 11:21 PM
Bill Dearborn
Tech Contributor
 
Bill Dearborn's Avatar
 
Member Since: Oct 1999
Location: Charlotte, NC (formerly Endicott, NY)
Posts: 40,089
Received 8,928 Likes on 5,333 Posts
Default

When both rear wheels are spinning they have no lateral traction and the back end of the car will go in whatever direction the physics of the surface dictate. If you are on a crowned surface with the car on the right side of the crown the back end will go right, if you are on the left side it will go left. There can be other things on the surface or part of it that can affect which way the back end goes.

If you are on a low grip surface it can be possible to have the back end swing back and forth like a pendulum as the driver countersteers.

Bill
Old 10-28-2016, 07:14 PM
  #2  
spearfish25
Melting Slicks
 
spearfish25's Avatar
 
Member Since: Apr 2016
Location: Naples FL
Posts: 3,085
Received 727 Likes on 479 Posts
Default

Check your alignment. Mine doesn't do that.
The following users liked this post:
Flyingscot (11-01-2016)
Old 10-28-2016, 07:27 PM
  #3  
davepl
Le Mans Master
 
davepl's Avatar
 
Member Since: May 2000
Location: Redmond WA
Posts: 8,727
Received 1,500 Likes on 987 Posts

Default

The Snap Oversteer Monster will be along shortly to blame rear caster. Maybe it's even true - but do people who get that "fixed" no long have to worry about the rear end coming around? I'd pay for an alignment if I believed it made the car more stable in street scenarios (I have had no issues on the track, so maybe my car is randomly set up properly from the factory).

Why would the gear make a difference as to why the rear end steps out? Any theories? That part strikes me as odd, and I can't say I've experienced the same.

Last edited by davepl; 10-28-2016 at 07:28 PM.
Old 10-28-2016, 07:34 PM
  #4  
RussC243
Instructor
Thread Starter
 
RussC243's Avatar
 
Member Since: Apr 2016
Posts: 103
Received 18 Likes on 13 Posts
Default

Originally Posted by DAVE396LT1
The Snap Oversteer Monster will be along shortly to blame rear caster. Maybe it's even true - but do people who get that "fixed" no long have to worry about the rear end coming around? I'd pay for an alignment if I believed it made the car more stable in street scenarios (I have had no issues on the track, so maybe my car is randomly set up properly from the factory).

Why would the gear make a difference as to why the rear end steps out? Any theories? That part strikes me as odd, and I can't say I've experienced the same.
I did have a theory on that actually. In 1st, once they break loose they both spin so much that there is no traction on either wheel. In 2nd and third one wheel is still gripping.... With the c4 I always felt the wheels slipping together. Maybe the electronic diff has something to do with it.
The following users liked this post:
pdiddy972 (02-11-2017)
Old 10-28-2016, 08:09 PM
  #5  
Niemienator
Racer
 
Niemienator's Avatar
 
Member Since: Oct 2016
Location: TX
Posts: 299
Received 24 Likes on 23 Posts
Default

Originally Posted by RussC243
I did have a theory on that actually. In 1st, once they break loose they both spin so much that there is no traction on either wheel. In 2nd and third one wheel is still gripping.... With the c4 I always felt the wheels slipping together. Maybe the electronic diff has something to do with it.
I would agree with this theory. My ZL1 did the same but always tended to turn or float to the left under hard throttle with wheel spin.

Regardless, I strongly recommend you get a good feel for the split second you have before the car goes to potentially violently out of control - the other lane, ditch.... Shift, back out of it and don't end on YouTube.
Old 10-28-2016, 09:09 PM
  #6  
Bad Dad
Pro
Support Corvetteforum!
 
Bad Dad's Avatar
 
Member Since: Jul 2014
Location: Naples Florida
Posts: 655
Received 70 Likes on 60 Posts
Default

Originally Posted by RussC243
Saw lots of videos/threads of people wrecking their new z06's so I am being careful. After my 500 mile oil change I got on it about 10 times today in 1, 2 and 3rd. Never rung it out as I will hold off on that untill about 2k miles.

In 1st the wheels break loose and the car just slides along straight as expected. In 2nd and 3rd, it violently jerks to the right. I let off it right way and the car jerks straight again.

My old supercharged c4 broke loose in 1st, 2nd and 3rd and I could floor it as much as I wanted and it continued to track straight while the wheels were slipping. It would get squirrelly at the top of 3rd at 100 mph but I could just correct with steering and stay on it. Done it a million times with the c4.

The c7 is asking to wrap itself around a tree. I am in touring mode it that matters

This is not right!!

Edit: I was on an empty private road.
Maybe lack of control ?
The following users liked this post:
BigBird440 (02-19-2017)
Old 10-28-2016, 09:10 PM
  #7  
thebishman
Melting Slicks
 
thebishman's Avatar
 
Member Since: Aug 2000
Location: Overland Park KS
Posts: 3,116
Received 735 Likes on 482 Posts

Default

Alignment check ASAP
Old 10-28-2016, 09:22 PM
  #8  
jaden61
Melting Slicks
 
jaden61's Avatar
 
Member Since: Oct 2010
Location: Fair Oaks, California
Posts: 2,162
Received 335 Likes on 243 Posts
2017 C7 of the Year Finalist

Default

Originally Posted by Bad Dad
Maybe lack of control ?
Had a little scare with mine a 2 weeks ago. Slight throttle input at the same time I hit the hydroplane puddle at 65mph on the freeway. All of the sudden looking left looking at center wall, eased it back with a quick whip and sliding 2 lanes toward the rear wheels of the 18 wheeler's trailer, to the fishtail correction finally. No skill, just pure luck. No poop, very happy today. used weather mode on the rest of ride home.

Last edited by jaden61; 10-28-2016 at 09:25 PM.
The following users liked this post:
Bad Dad (12-19-2016)
Old 10-28-2016, 10:07 PM
  #9  
feeder82
Melting Slicks
 
feeder82's Avatar
 
Member Since: Mar 2005
Location: Wisconsin
Posts: 3,461
Received 981 Likes on 624 Posts

Default

your c4 didn't have over 500 ft lbs of torque at the rear wheels
Old 10-28-2016, 10:55 PM
  #10  
gatti-man
Melting Slicks
 
gatti-man's Avatar
 
Member Since: Apr 2007
Location: round rock tx
Posts: 2,490
Received 62 Likes on 34 Posts

Default

My c6z has 550 at the wheels NA and it doesn't slide right. Powers right through wheel spin straight ahead. Non run flat super sports, stock suspension.
The following users liked this post:
RussC243 (10-30-2016)
Old 10-28-2016, 11:21 PM
  #11  
Bill Dearborn
Tech Contributor
 
Bill Dearborn's Avatar
 
Member Since: Oct 1999
Location: Charlotte, NC (formerly Endicott, NY)
Posts: 40,089
Received 8,928 Likes on 5,333 Posts

Default

When both rear wheels are spinning they have no lateral traction and the back end of the car will go in whatever direction the physics of the surface dictate. If you are on a crowned surface with the car on the right side of the crown the back end will go right, if you are on the left side it will go left. There can be other things on the surface or part of it that can affect which way the back end goes.

If you are on a low grip surface it can be possible to have the back end swing back and forth like a pendulum as the driver countersteers.

Bill
The following 12 users liked this post by Bill Dearborn:
360Lemans (11-04-2016), BigBird440 (02-19-2017), BWFitz (08-08-2017), furiousox (04-05-2018), Harbgrogan (10-17-2018), Jus Cruisin (02-14-2017), MassGT (02-18-2017), MindBend (10-29-2016), MP&RPZ06 (05-22-2018), RGT (08-07-2017), RocksZC7 (12-08-2018), SterlingDrive (09-28-2017) and 7 others liked this post. (Show less...)
Old 10-29-2016, 12:05 AM
  #12  
Greg00Coupe
Race Director
 
Greg00Coupe's Avatar
 
Member Since: Aug 1999
Location: Bluffton SC via Canton Oh
Posts: 11,355
Received 1,984 Likes on 1,143 Posts

Default

Originally Posted by Bill Dearborn
When both rear wheels are spinning they have no lateral traction and the back end of the car will go in whatever direction the physics of the surface dictate. If you are on a crowned surface with the car on the right side of the crown the back end will go right, if you are on the left side it will go left. There can be other things on the surface or part of it that can affect which way the back end goes.

If you are on a low grip surface it can be possible to have the back end swing back and forth like a pendulum as the driver countersteers.

Bill
I'd agree with this. However I've been on numerous surfaces and it always breaks right. I've learned to expect it. If it broke left I'd probably crash or keel over due to shock
The following users liked this post:
RussC243 (10-30-2016)
Old 10-29-2016, 03:37 AM
  #13  
RussC243
Instructor
Thread Starter
 
RussC243's Avatar
 
Member Since: Apr 2016
Posts: 103
Received 18 Likes on 13 Posts
Default

Lots of great answers. Thanks! Will study up on how alignment comes into play. I always only considered alignment when my daily drivers would not track straight hands off the wheel or the tire guy talks me into a badly needed alignment.
Don't really care to use more than about 200hp 99.9% of the time. Got the z over the base because I like fine machines but I do like to understand them and have them set up right. Sunny today...can't wait to try out the stack of new microfiber towels and wax.
Old 10-29-2016, 07:00 AM
  #14  
marc0779
Instructor
 
marc0779's Avatar
 
Member Since: May 2014
Location: Naples
Posts: 237
Received 53 Likes on 26 Posts
Default Rear alighnment

If you only drive the car on the street have your rear camber adjusted to zero or as close as you can get it will more than double your traction in a straight line and you will double the life of the tires.

Last edited by marc0779; 10-29-2016 at 07:01 AM. Reason: Missing words
The following 2 users liked this post by marc0779:
Harbgrogan (10-17-2018), SterlingDrive (12-07-2016)
Old 10-29-2016, 08:32 AM
  #15  
MindBend
Racer
 
MindBend's Avatar
 
Member Since: Jun 2016
Location: PA
Posts: 362
Received 44 Likes on 35 Posts
Default

It happens even on $200K AMG's when drivers run out of talent.
I was leaving a local cars and coffee event couple weeks ago and some dude captured this as I was leaving. I left gentlemanly, in order to try to troll in the GT to follow me for some "fun", but he turned the other way... check out the results.

Sorry....the stupid YouTube embed function REFUSES to work.
Old 10-29-2016, 08:33 AM
  #16  
MindBend
Racer
 
MindBend's Avatar
 
Member Since: Jun 2016
Location: PA
Posts: 362
Received 44 Likes on 35 Posts
Default

As a follow-up, this is how the Z crowd rolls (or should!)

The following 6 users liked this post by MindBend:
BigBird440 (02-19-2017), C5 Hardtop (12-21-2016), cheapthrills (04-16-2018), dmaxx3500 (12-07-2016), snow (04-04-2018), WildRide357 (02-19-2017) and 1 others liked this post. (Show less...)
Old 10-29-2016, 10:37 PM
  #17  
bondo55
Advanced
 
bondo55's Avatar
 
Member Since: Oct 2016
Location: Santa Barbara, CA
Posts: 51
Received 7 Likes on 7 Posts
Default

I can relate. I can run the car hard at roadcourse trackdays with no issues at all.

But when on the getting on a freeway on ramp, the e-diff seams to hunt for traction between the left and right tires at times on uneven surfaces. A very different feel vs a normal "posi" limited slip diff.
The following users liked this post:
Bad Dad (12-19-2016)

Get notified of new replies

To Why do C7 Z06's pull to the right violently when breaking loose...WTF

Old 10-29-2016, 11:06 PM
  #18  
rikhek
Safety Car
 
rikhek's Avatar
 
Member Since: Aug 2005
Location: Tulsa Oklahoma
Posts: 3,968
Received 860 Likes on 393 Posts

Default

Originally Posted by thebishman
Alignment check ASAP
Originally Posted by RussC243
Lots of great answers. Thanks! Will study up on how alignment comes into play. I always only considered alignment when my daily drivers would not track straight hands off the wheel or the tire guy talks me into a badly needed alignment.
Don't really care to use more than about 200hp 99.9% of the time. Got the z over the base because I like fine machines but I do like to understand them and have them set up right. Sunny today...can't wait to try out the stack of new microfiber towels and wax.
Originally Posted by marc0779
If you only drive the car on the street have your rear camber adjusted to zero or as close as you can get it will more than double your traction in a straight line and you will double the life of the tires.
DAVE396LT1, great idea isn't it?
The following users liked this post:
Plstxmd (04-16-2018)
Old 10-30-2016, 01:30 AM
  #19  
tail_lights
Race Director
 
tail_lights's Avatar
 
Member Since: Apr 2009
Location: SE TEX
Posts: 10,581
Received 252 Likes on 210 Posts

Default

I can relate. My first Z ended up in a ditch I am more scared of this car than my old C5 that was making over 700 RWHP and I only ran Bridgestone all season 275 tires on that At least when that car spun it would track straight. Not sure if it is an alignment or a E-LSD issue but there is an issue for sure.
Old 10-30-2016, 01:58 AM
  #20  
omar510
Heel & Toe
 
omar510's Avatar
 
Member Since: Dec 2013
Posts: 15
Likes: 0
Received 2 Likes on 2 Posts
Default

In my opinion it's because in 1st gear you have no traction all due to torque multiplication. 2nd and 3rd the gear tires start to gain traction due to less torque multiplication. This coupled with the fact that the tires can now spin up to 93 mph in 2nd and 124 mph in 3rd so whatever instantaneous traction the tires do catch thrust the car harder and further. With one tire gripping it makes the car yaw to either side.
The following users liked this post:
tomtoro (04-14-2018)


Quick Reply: Why do C7 Z06's pull to the right violently when breaking loose...WTF



All times are GMT -4. The time now is 03:53 PM.