Nissan Road Racing Forums

Go Back   Nissan Road Racing Forums > Chassis > Z Car/G35/G37

Reply
 
Thread Tools Display Modes
  #1  
Old 08-31-2015, 07:45 AM
D K D K is offline
Junior Member
 
Join Date: Feb 2011
Posts: 11
Default 350 knockback issues

Hello

I know ther are a lot of cars with serious knockback problems.

Has anyone found a good solution to fix the problem?

David
Reply With Quote
  #2  
Old 08-31-2015, 08:22 AM
Matt93SE Matt93SE is online now
Senior Member
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 5,923
Default

pump the brake pedal a couple times before stopping.

My G35 w/ StopTechs has had an annoying knockback issue since the day I bought it. poor design on the wheel bearings I guess.
__________________
Quote:
Originally Posted by SoSideways View Post
I don't care what color they are as long as they are LONG AND HARD.
'04 G35 Sedan 6MT- The DD
'96 240SX- The Track Toy
Reply With Quote
  #3  
Old 08-31-2015, 08:42 AM
gills gills is online now
Senior Member
 
Join Date: Mar 2013
Location: LI, NY
Posts: 564
Default

Quote:
Originally Posted by D K View Post
Hello

I know ther are a lot of cars with serious knockback problems.

Has anyone found a good solution to fix the problem?

David
I had this issue on my 04 Subaru STi with the older 5x100 hubs/bearings. It sucks. I would just tap the pedal a couple times on the straights before braking zones like Matt93SE said.

You can also try this solution. Don't have firsthand experience with it though:
http://www.apracing.com/Info.aspx?In...10&ProductID=7
Reply With Quote
  #4  
Old 08-31-2015, 02:36 PM
icantdrift icantdrift is offline
Senior Member
 
Join Date: Oct 2010
Posts: 434
Default

A residual pressure valve will also help some, but if your bearings/rotors are sloppy you will still have it happen.
Reply With Quote
  #5  
Old 08-31-2015, 06:52 PM
Def Def is online now
Budget Baller to the Max
 
Join Date: Dec 2007
Location: Houston, TX
Posts: 11,876
Send a message via AIM to Def
Default

G35/350Zs just do that - the bearing is underdesigned for the loads. Nothing will really fix it except a more robust bearing/spindle.
__________________
'18 Chevrolet Volt - Electric fun hatch for DD duty!


DefSport Koni Sleeve and Spring Perch Buy!!!
http://www.nissanroadracing.com/showthread.php?t=5902
Reply With Quote
  #6  
Old 08-31-2015, 08:03 PM
theultimatehero theultimatehero is offline
Senior Member
 
Join Date: Oct 2014
Posts: 122
Default

I had no idea what this meant, nor that it had a specific name. For anyone that needs an explenation (like I did) StopTech has an article on it. I have found other usefull articles on their site too, like this one on Warped Brake Discs.
Reply With Quote
  #7  
Old 09-01-2015, 07:47 AM
Sleepy_Steve Sleepy_Steve is offline
Senior Member
 
Join Date: May 2010
Location: Columbia, MD
Posts: 887
Default

Right knee injuries are great practice for left foot braking.
__________________
'95 240sx
Reply With Quote
  #8  
Old 09-01-2015, 05:51 PM
eye-5 eye-5 is offline
Senior Member
 
Join Date: Sep 2008
Location: Chicago
Posts: 1,556
Default

I've seen some cool in car footage with pros that always tap the brake with their left foot before any major braking zone.

Sent from my SGH-M919 using Tapatalk
__________________
Chicago Region SCCA SM # 688 http://www.scca-chicago.com
TSSCC SM # 688 http://www.tsscc.org
Reply With Quote
  #9  
Old 09-02-2015, 05:47 AM
Matt93SE Matt93SE is online now
Senior Member
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 5,923
Default

There's a damn good reason for that..
__________________
Quote:
Originally Posted by SoSideways View Post
I don't care what color they are as long as they are LONG AND HARD.
'04 G35 Sedan 6MT- The DD
'96 240SX- The Track Toy
Reply With Quote
  #10  
Old 09-02-2015, 07:26 AM
240sxTTC 240sxTTC is offline
Senior Member
 
Join Date: Sep 2009
Location: Cleveland, OH
Posts: 926
Default

I do it before every corner except for corners that are immediately after the previous. It's a great safety habit to get into. It firms up the pedal from knockback plus will also warn you early if there is a major issue.
Certain cars are more susceptible than others but the severity and occurrence is also track dependent. Tracks with taller curbs and tracks where the fast line is using those curbs will increase both occurrence and severity.
My lap around Mid-OH. The light above the shifter is connected to the brake switch - https://vimeo.com/108166468
__________________
NASA Time Trials TT3


BTW I work for Garrett
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
vBulletin Style by: kreativfantasy.com
www.nissanroadracing.com