Nissan 370Z Forum  

Need help eliminating oversteer

I am running a full race 370z and I have been struggling with oversteer. Now, I don't mind a car that oversteers, but I can't stand dancing the car through

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Brakes & Suspension


Like Tree22Likes

Reply
 
LinkBack Thread Tools Display Modes
Old 08-03-2018, 03:12 PM   #1 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default Need help eliminating oversteer

I am running a full race 370z and I have been struggling with oversteer. Now, I don't mind a car that oversteers, but I can't stand dancing the car through turns and having to wait to go to power after the apex because the *** wants to swap ends with the front.

The car is lowered and running on JRZ double adjustable coil over's. Spring rates are 1K up front and 800 rear. The bar is disconnected in the back to try to get some bite, but it's still only a partial fix. We have experimented with dampening and now I am pulling the shocks to soften the springs in the rear, but I just don't think I am going to get a marked improvement without altering the geometry in the back.

Is there anybody that has ANY feedback on the WiseFab rear suspension upgrade? Is there a significant improvement to be had by using their geometry?

Any help would be appreciated. Feel free to ask questions if you need.
robertkroll is offline   Reply With Quote
Old 08-03-2018, 03:53 PM   #2 (permalink)
A True Z Fanatic
 
cv129's Avatar
 
Join Date: Jul 2011
Location: Dallas, TX
Posts: 3,188
Drives: 09 Nismo, 16 Nismo
Rep Power: 159827
cv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond repute
Default

Curious.....Tire compound and size? Aero? Current alignment reading?
__________________
Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield
cv129 is offline   Reply With Quote
Old 08-03-2018, 03:58 PM   #3 (permalink)
Premium Member
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684384
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

Yep need a lot more information on your setup before we can begin to answer your questions.

Sent from my SM-G965U using Tapatalk
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|
Hotrodz is offline   Reply With Quote
Old 08-03-2018, 04:12 PM   #4 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default

I have all the data in my binder in the transporter and the car is out of state. I will have to get back to you when I get the car back this weekend.

Thanks for the quick responses.
robertkroll is offline   Reply With Quote
Old 08-03-2018, 05:24 PM   #5 (permalink)
A True Z Fanatic
 
2011 Nismo#91's Avatar
 
Join Date: Mar 2011
Location: NJ
Posts: 2,379
Drives: slowly
Rep Power: 33858
2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute2011 Nismo#91 has a reputation beyond repute
Default

There's some info in here on this same topic.
Holy Understeer!
__________________
GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs
2011 Nismo#91 is offline   Reply With Quote
Old 08-03-2018, 05:55 PM   #6 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default

Ok, here is more information:

Front wheels:
18x9.5 Enkei NT03+M / 275/30 Hoosier R7

Rear wheels:
18x10.5 Enkei NT03+M / 295/30 Hoosier R7

Left Front
-2.9 Camber
5 Caster
.09 Toe

Front total toe
.19

Steer ahead
0.00

Right Front
-2.3 Camber
5 Caster
.10 Toe

Left Rear
-2 Camber
.22 Toe

Right Rear
-2 Camber
.21 Toe

Rear Total Toe
0.44

Rear thrust angle
0.01

Chassis:
TC Designs custom cage with reinforcement to firewall
JRZ RS-Pro 2-way adjustable dampers with Hyperco springs 1000 / 800
SPL rear camber arms
SPL rear toe links
SPL rear knuckle monoball bushings
SPC front camber arms
Hotchkis sway bars

Drivetrain:
OS Giken 1.5 way differential with 3.54 gears
Short shift
Custom tilton/ setrab diff cooler with toggle switch
Diff Pump and cooler

Brakes
Stoptech Trophy motorsports brakes with slotted rotors. 6 piston front, dual piston rear.
Tevis stand alone motorsports ABS system with Tilton adjustable bias valve

Engine
Stillen gen 3 intake
Tuned for 93 octane 354 WHP/ 305 WTQ on Pellegrini Performance dynojet
AE Performance oil cooler
Custom 4 -> 1 SS Exhaust
Long tube headers from Fast Intentions

Fuel:
ATL 32 Gallon FIA certified Fuel Cell
Moroso Fuel Pump
Moroso fuse panel and switches

Interior
Sparco 330mm flat bottom steering wheel with quick release
Steering wheel mounted controls (Radio, Brights, Cool Shirt, PTP, Limiter)
AFFF Fire system
Custom carbon switch panel
Custom dead pedal
Battery relocated to trunk area

Aero:
Aeromotions carbon wing
Lowered front end and splitter
Front underpan
Midsection underpan
Carbon rear deck
Lexan windows
Carbon lowered side skirts
Composite fenders with exhaust ducting
3" carbon front brake cooling intakes and ducts

DarkJak likes this.

Last edited by robertkroll; 08-03-2018 at 06:11 PM.
robertkroll is offline   Reply With Quote
Old 08-03-2018, 06:15 PM   #7 (permalink)
Premium Member
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684384
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

I need to see some pictures of your car she sounds bad *** and you got all the good stuff.

Sent from my SM-G965U using Tapatalk
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|
Hotrodz is offline   Reply With Quote
Old 08-03-2018, 06:17 PM   #8 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default

Quote:
Originally Posted by Hotrodz View Post
I need to see some pictures of your car she sounds bad *** and you got all the good stuff.

Sent from my SM-G965U using Tapatalk
I'm not sure this will work or not:

https://www.instagram.com/p/BmCOASBF...y=too_cool_dad

https://www.instagram.com/p/BmCOCkrB...y=too_cool_dad
robertkroll is offline   Reply With Quote
Old 08-03-2018, 06:22 PM   #9 (permalink)
Premium Member
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684384
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

You may want to get her corner balanced since you gone full race car before you start making adjustments. That will help with getting your spring rates and ride height to a place you can start to work from.

Sent from my SM-G965U using Tapatalk
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|
Hotrodz is offline   Reply With Quote
Old 08-03-2018, 07:35 PM   #10 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default

Quote:
Originally Posted by Hotrodz View Post
You may want to get her corner balanced since you gone full race car before you start making adjustments. That will help with getting your spring rates and ride height to a place you can start to work from.

Sent from my SM-G965U using Tapatalk
Did that.
robertkroll is offline   Reply With Quote
Old 08-03-2018, 07:37 PM   #11 (permalink)
Premium Member
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684384
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

Quote:
Originally Posted by robertkroll View Post
Yep the link does not work... I sent you a follow request!
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|

Last edited by Hotrodz; 08-03-2018 at 07:40 PM.
Hotrodz is offline   Reply With Quote
Old 08-03-2018, 07:57 PM   #12 (permalink)
Premium Member
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684384
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

Quote:
Originally Posted by robertkroll View Post
Did that.
Ok cool it looks like your camber is .5 degrees apart on the front. Is that a typo? Also you could add some more front camber -3.3 and increase your caster to 6 or more. Your rear seams spot on.

Sent from my SM-G965U using Tapatalk
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|

Last edited by Hotrodz; 08-03-2018 at 08:31 PM.
Hotrodz is offline   Reply With Quote
Old 08-03-2018, 10:27 PM   #13 (permalink)
A True Z Fanatic
 
cv129's Avatar
 
Join Date: Jul 2011
Location: Dallas, TX
Posts: 3,188
Drives: 09 Nismo, 16 Nismo
Rep Power: 159827
cv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond reputecv129 has a reputation beyond repute
Default

Wow standalone ABS. You weren't kidding when you said a full race car.

Could you describe the oversteer? Was it entry, mid corner, exit, or left to right transition?

When you've gone into thinking changing rear suspension geometry, I am sure you have already tried the usual suspects, like toe, downforce, rebound and compression settings, brake bias....It'll be great if you can share the different adjustments you've made and your conclusions on them.

And the SPC front camber arms...typo?
DarkJak and Hotrodz like this.
__________________
Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield
cv129 is offline   Reply With Quote
Old 08-03-2018, 11:31 PM   #14 (permalink)
Base Member
 
robertkroll's Avatar
 
Join Date: Mar 2018
Location: West Sayville, NY
Posts: 21
Drives: 2009 370z
Rep Power: 7
robertkroll is on a distinguished road
Default

Quote:
Originally Posted by Hotrodz View Post
Ok cool it looks like your camber is .5 degrees apart on the front. Is that a typo? Also you could add some more front camber -3.3 and increase your caster to 6 or more. Your rear seams spot on.

Sent from my SM-G965U using Tapatalk
The bite at the front is good, the oversteer is the issue. I am researching suspension alternatives for the rear that can improve the grip with new geometric angles since the car is lowered.
robertkroll is offline   Reply With Quote
Old 08-03-2018, 11:46 PM   #15 (permalink)
Ronin Samurai - Assassin
 
Rusty's Avatar
 
Join Date: Dec 2011
Location: Fayettenam,Pennsyltucky
Age: 68
Posts: 34,812
Drives: 2011 Nismo GM 6M
Rep Power: 2684436
Rusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond repute
Talking

Quote:
Originally Posted by cv129 View Post
Wow standalone ABS. You weren't kidding when you said a full race car.

Could you describe the oversteer? Was it entry, mid corner, exit, or left to right transition?

When you've gone into thinking changing rear suspension geometry, I am sure you have already tried the usual suspects, like toe, downforce, rebound and compression settings, brake bias....It'll be great if you can share the different adjustments you've made and your conclusions on them.

And the SPC front camber arms...typo?
Too add to that question. Is it tail happy all the time? Or at different corner speeds? What's your tire temps across the tires. What's your fuel level when it happens? How many heat cycles on the tires?
__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

Last edited by Rusty; 08-03-2018 at 11:52 PM.
Rusty is offline   Reply With Quote
Reply

Bookmarks

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Eliminating un-necessary expenditures, starting with cable bill! HD Antenna Q? newls196 The Lounge (Off Topic) 9 12-04-2016 04:39 PM
Oversteer in right hand turns JWillis72 Brakes & Suspension 57 04-03-2014 08:59 AM
Having Roll Cage and eliminating some Rear Suspension components SPOHN Track / Autocross / Drifting / Dragstrip 31 02-12-2014 12:00 PM
Oversteer! Garrett63 Nissan 370Z General Discussions 3 02-28-2013 05:50 PM
Oversteer in 2010, 370Z, Roadster roopjt Wheels & Tires 5 09-13-2012 02:20 PM


All times are GMT -5. The time now is 06:52 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2