[ASKED] "Ice mode" in PTM driving modes - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > Ask Tadge > Ask Tadge
Reload this Page >

[ASKED] "Ice mode" in PTM driving modes

Notices
Ask Tadge Post your questions here for Corvette's Chief Engineer Tadge Juechter and then discuss the questions and his answers.

[ASKED] "Ice mode" in PTM driving modes

Old 06-05-2018, 01:22 PM
  #1  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default [ASKED] "Ice mode" in PTM driving modes

A number of us were wondering why the hard brake pedal mode ("ice mode" as its been called ) is active in PTM, especially sport 2 and race. It seems like it activates when a wheel is suddenly or quickly locked, like it would on ice or other low friction surface. Unfortunately, a wheel locking quickly happens a lot on the track because, generally, one or more tires are unloaded at any given time, plus things like bumps and curbing unload them.

A combination of being unloaded with big brakes and track brake pads seems to engage this "ice mode" on the track, where it's difficult to see the benefit of it. So what is this "ice mode" and why is active in PTM? It seems very dangerous.
village idiot is offline  
The Following 3 Users Say Thank You to village idiot For This Useful Post:
CorvetteBrent (07-04-2018), fatsport (06-09-2018), serendib (06-05-2018)
Old 06-17-2018, 08:27 PM
  #2  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default

yay, got picked to get voted on.
village idiot is offline  
Old 06-17-2018, 08:59 PM
  #3  
fleming23
CF Senior Member
 
fleming23's Avatar
 
Member Since: Feb 2009
Location: Dallas Georgia
Posts: 2,458
Thanked 453 Times in 322 Posts
Default

I hope we get some sort of helpful answer, but expect it will be a corporate response. This **** has sent me off track a couple times, and is the most frustrating part of driving competitively. At some point, someone is going to get hurt when they go to stop and the brake pedal goes rock hard not allowing them to stop as expected.
fleming23 is offline  
The Following User Says Thank You to fleming23 For This Useful Post:
CorvetteBrent (07-04-2018)
Old 06-17-2018, 09:00 PM
  #4  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default

Originally Posted by fleming23 View Post
I hope we get some sort of helpful answer, but expect it will be a corporate response. This **** has sent me off track a couple times, and is the most frustrating part of driving competitively. At some point, someone is going to get hurt when they go to stop and the brake pedal goes rock hard not allowing them to stop as expected.
I started braking 100ft back when I know it's bumpy and backing up 50ft just because of this.

I also started braking more progressively, like I do in non ABS cars.
village idiot is offline  
The Following User Says Thank You to village idiot For This Useful Post:
CorvetteBrent (07-04-2018)
Old 06-22-2018, 06:59 PM
  #5  
ponderingtom
Junior Member
Support Corvetteforum!
 
ponderingtom's Avatar
 
Member Since: Nov 2017
Location: Anchorage Alaska
Posts: 24
Thanked 5 Times in 3 Posts
Default

Thank you, Village idiot, for posting this question. I'm still new to the board and didn't know about the Ask Tadge group. Love it!

I have video from an autocross I went to last weekend where 1 out of 8 runs, I had the issue. Almost blew through the cones after the finish lights. The telemetry on the PDR video shows I was at about 60% braking when I was actually standing on the pedal trying to get it to stop. The other 7 runs, it also showed about 60%, but it stopped in about half the distance and I was truly applying about 60% force on the pedal.

We gotta get a solution to this!
ponderingtom is offline  
The Following User Says Thank You to ponderingtom For This Useful Post:
CorvetteBrent (07-04-2018)
Old 06-25-2018, 08:28 PM
  #6  
tw78911sc
CF Senior Member
 
Member Since: Oct 2017
Location: Wilmington NC
Posts: 269
Thanked 28 Times in 27 Posts
Default

Not just a Corvette issue, I had it happen to me at Watkins and VIR in a 15 Camaro SS 1LE. It happened to me in my 07 Z06 at NCRR at over 150 mph into a 35mph tight U turn and I was ready to write it off, luckily it did slow enough to late entry the corner, I had no time to start manually pumping pedals Only happened 1x at the same track. You loose confidence like others said and you start backing up braking points. I've heard a lot of spec racers are approved to use a cheap BMW ABS unit that is a plug in.
tw78911sc is offline  
The Following User Says Thank You to tw78911sc For This Useful Post:
CorvetteBrent (07-04-2018)
Old 06-26-2018, 08:57 AM
  #7  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default

Originally Posted by tw78911sc View Post
Not just a Corvette issue, I had it happen to me at Watkins and VIR in a 15 Camaro SS 1LE. It happened to me in my 07 Z06 at NCRR at over 150 mph into a 35mph tight U turn and I was ready to write it off, luckily it did slow enough to late entry the corner, I had no time to start manually pumping pedals Only happened 1x at the same track. You loose confidence like others said and you start backing up braking points. I've heard a lot of spec racers are approved to use a cheap BMW ABS unit that is a plug in.
yup. I backed my brake points up by 100ft.
village idiot is offline  
Old 06-30-2018, 11:03 AM
  #8  
[email protected]
Premium Supporting Vendor
 
Dane@LGmotorsports's Avatar
 
Member Since: Sep 2017
Location: DFW Texas
Posts: 425
Thanked 105 Times in 70 Posts
Default

Originally Posted by fleming23 View Post
I hope we get some sort of helpful answer, but expect it will be a corporate response. This **** has sent me off track a couple times, and is the most frustrating part of driving competitively. At some point, someone is going to get hurt when they go to stop and the brake pedal goes rock hard not allowing them to stop as expected.
Originally Posted by village idiot View Post
I started braking 100ft back when I know it's bumpy and backing up 50ft just because of this.

I also started braking more progressively, like I do in non ABS cars.
Sounds like a project for us.
Dane@LGmotorsports is offline  
The Following 2 Users Say Thank You to [email protected] For This Useful Post:
CorvetteBrent (07-04-2018), spinkick (07-12-2018)
Old 07-01-2018, 09:17 AM
  #9  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default

Originally Posted by [email protected] View Post
Sounds like a project for us.
I'd love a solution and happy to help test. If you get no ice mode at ecr going into T6, you're not getting it anywhere.
village idiot is offline  
The Following User Says Thank You to village idiot For This Useful Post:
CorvetteBrent (07-04-2018)
Old 07-04-2018, 03:38 AM
  #10  
CorvetteBrent
CF Senior Member
 
Member Since: May 2016
Location: Port Charlotte Florida
Posts: 154
Thanked 33 Times in 20 Posts
Default

Originally Posted by [email protected] View Post
Sounds like a project for us.
Yes, go for it!
CorvetteBrent is offline  
Old 07-07-2018, 10:26 PM
  #11  
LagunaSecaZ06
CF Senior Member
 
Member Since: Jul 2016
Location: San Jose California
Posts: 218
Thanked 88 Times in 31 Posts
Default

I have 2016 Z06/Z07 that I switched Girodiscs and ST43 on to it. At Laguna Seca a few days ago I was getting ice mode going into turn 2 (front straight leading to the hair pin) and going into Turn 8 (90* hard left into the corkscrew). In both of these places I was concerned about going off track. When I pitted after my session, my rotors were about 400*. A C6 Z06 that was in my group, his rotors were about 800* in the pits. I think the ice mode was limiting my braking pressure and hence rotor temperature. If was getting brake fade, I would think that my rotors would be over 800* and smoking. My rotors look great with no pad deposits. I am going to call Girodisc on Monday for their recommendation. With CCB's my car was a monster at Laguna Seca, I would brake really late and have complete confidence (the pedal never got really hard either).
LagunaSecaZ06 is offline  
Old 07-08-2018, 09:58 AM
  #12  
jvp
Tech Contributor
Support Corvetteforum!
 
jvp's Avatar
 
Member Since: Mar 1999
Location: Oak Hill VA
Posts: 8,572
Thanked 1,450 Times in 411 Posts
"Ask Tadge" Facilitator
Default

Quick note: GM's been on a 2-week summer vacation, so this question has to wait. We should see an answer out of Tadge in the coming weeks when he gets back into the office. Stand by.
jvp is offline  
The Following 2 Users Say Thank You to jvp For This Useful Post:
IM4A2Z (07-09-2018), ponderingtom (07-11-2018)
Old 07-11-2018, 06:28 PM
  #13  
village idiot
CF Senior Member
Thread Starter
 
village idiot's Avatar
 
Member Since: Oct 2011
Posts: 5,125
Thanked 595 Times in 414 Posts
Default

Thanks for the update. Any ETA?
village idiot is offline  


Thread Tools
Search this Thread
Quick Reply: [ASKED] "Ice mode" in PTM driving modes


Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.