Go Back   Chevy Sonic Owners Forum > Chevy Sonic: Technical > Handling, Braking and Suspension Discussion

Like Tree2Likes
Reply
 
LinkBack Thread Tools Display Modes
Old 06-17-2017, 06:12 PM   #1
Senior Member
 
Join Date: Apr 2017
Posts: 105
Garage
Default Bouncy rear end w/ zzp springs

Installed my zzp springs and rear sway bar a couple weeks ago. Noticed the rear end is a little bouncy (underdamped) now. My LT only has 66k and wasnt noticably bouncy before the springs. Are the RS rear dampers a little better for slightly stiffer springs?

Thanks all.
-RuD
__________________
2013 Sonic LT 1.4/6M black.
Build thread:
http://www.sonicownersforum.com/foru...urd-sonic.html
sw2low is offline   Reply With Quote
Old 06-17-2017, 07:28 PM   #2
Sedans Rule!
 
Stew's Avatar
 
Join Date: Jan 2013
Location: Smokey Point, WA
Posts: 1,531
Default

Quote:
Originally Posted by sw2low View Post
Are the RS rear dampers a little better for slightly stiffer springs?
On paper they should be since they have firmer valving.
__________________
Build Thread -> 2013 LTZ Sedan - 1.4L 6MT

Mods:
- 22.75 PSI self tuned - HP Tuners
- 42 lb/hr Bosch injectors
- Ported intake manifold, minor TB cleanup
- Hard piped SAB, snorkel delete
- Bypassed BPV solenoid
- 11.8" OEM front brakes
- RS rear disc brakes, RS springs
- MPFab DRS
- Chevy Cruze auto dimming rear view mirror
- Buick Verano dome light w/ accent lighting & backlit map light buttons
- Painted bowties, black lug nuts, Moog endlinks
- 225/45-ZR17 BFG Sport Comp-2 tires
Stew is offline   Reply With Quote
Old 06-17-2017, 11:15 PM   #3
Senior Member
 
Join Date: Apr 2017
Posts: 105
Garage
Default

That was my thought, lower RS springs means stiffer springs means more damping required. Didnt know if anyone had experience though, with zzps or eibachs or otherwise.
-RuD
__________________
2013 Sonic LT 1.4/6M black.
Build thread:
http://www.sonicownersforum.com/foru...urd-sonic.html
sw2low is offline   Reply With Quote
Old 06-17-2017, 11:25 PM   #4
Member
 
shibbs's Avatar
 
Join Date: May 2017
Location: TC area MN
Posts: 59
Garage
Default

Well on the new cars, if you buy the lowering kit, they use the RS front struts, but include new, stiffer rear shocks.
Llia and Thankyou_Comeagain! like this.
shibbs is online now   Reply With Quote
Old 06-18-2017, 03:36 AM   #5
Senior Member
 
Join Date: Apr 2017
Posts: 105
Garage
Default

Stiffer than RS shocks? Labelled 'FE3'?
__________________
2013 Sonic LT 1.4/6M black.
Build thread:
http://www.sonicownersforum.com/foru...urd-sonic.html
sw2low is offline   Reply With Quote
Old 06-18-2017, 03:41 PM   #6
The Sticker Guy
 
$ub$onic's Avatar
 
Join Date: Sep 2012
Location: eau claire pa
Posts: 11,207
Garage
Default

Your shocks are blown.

Replace then and the bounce will go away

Sent from my S60 using Tapatalk
__________________
2012 LS 1.8 track car
2012 LTZ turbo daily
2015 LTZ turbo

interested in AMSOIL?
http://www.snailwerksracing.com/amsoil.html

I get all my parts from Bad News Racing- Click their logo to check them out!

$ub$onic is offline   Reply With Quote
Old 06-18-2017, 05:08 PM   #7
Senior Member
 
Syrup's Avatar
 
Join Date: Jun 2015
Location: San Diego
Posts: 145
Garage
Default

Make sure you are using the correct bump stops too.

-Syrup
__________________
2014 1.4T LT Hatch
moustache-delete
RS seats, floormats, and shifter
17" Sparco Assetto Gara wheels
lowering springs
mudflaps
shifter bushings
OEM fog lights
Syrup is offline   Reply With Quote
Old 06-18-2017, 06:45 PM   #8
Senior Member
 
Join Date: Apr 2017
Posts: 105
Garage
Default

Its odd it wasnt bouncy at all before if they are indeed blown. I assume its worth upgrading to the LE3 shocks if i have to replace them anyway?

Thanks,
__________________
2013 Sonic LT 1.4/6M black.
Build thread:
http://www.sonicownersforum.com/foru...urd-sonic.html
sw2low is offline   Reply With Quote
Old 06-19-2017, 03:52 AM   #9
The Sticker Guy
 
$ub$onic's Avatar
 
Join Date: Sep 2012
Location: eau claire pa
Posts: 11,207
Garage
Default

Bounce is related to the ability of the dampener to control the spring.
Now that you have lowering springs the valving in the shocks may be out of effective range

Sent from my S60 using Tapatalk
__________________
2012 LS 1.8 track car
2012 LTZ turbo daily
2015 LTZ turbo

interested in AMSOIL?
http://www.snailwerksracing.com/amsoil.html

I get all my parts from Bad News Racing- Click their logo to check them out!

$ub$onic is offline   Reply With Quote
Old 06-19-2017, 09:47 AM   #10
also a dinner prick
 
mitdr774's Avatar
 
Join Date: Apr 2012
Posts: 4,202
Garage
Default

RS or shocks for a 15" wheel should be able to control the spring fairly well. I would go the RS route personally.
__________________
2012 1.8/5mt Slow but still around
2012 1.4/6mt Gone
2017 1.4/6mt Gone
Who would have thought that my V6 truck would be my quickest vehicle?
mitdr774 is offline   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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT. The time now is 04:00 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.1
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.