violent shaking after susp. goes on??!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sw20>>s14 · 01-06-2006, 04:45 PM

i just installed a tanabe sustec front strut bar, nismo powerbrace, and fatty uras tension rods simultaneously...at first, my wheel and tire specs were messed up...i was running 16"/15", 245/50/16 and 205/45/15, and not balanced (borrowed from a friend waiting for tires to be put on)...

so the first test drive with the aforementioned specs was relativeley good...very tight front end and responsive steering...but when i got on the highway, the second the needle pasted 60mph, it shook VERY violently...i mean to the point where i couldnt drive...so my friend and i assumed that since the wheels were not balanced, now the vibrations were traveling from the knuckle->tc rods->powerbrace->straight to the chassis...meaning theres no more give and transfer of force to chassis is no longer being loss in bushings and deflection...opposed to the bushings and weak stock tc rod brackets taking all the motion...

okay, no big deal...so i slap on my other wheels which are 16x7 with stock 205/55/16...just mounted tires on all four and balanced...it was okay for the first day, but sometimes it still does the shaking...last night on the highway it would shake every now and then...and i mean hard...imagine my toolset in my pass. seat, it sounded like a ton of marbles in those cookie tins...but now, it shakes at higher speeds e.g. 65-70mph...

it almost feels like the motion builds up and finally shakes the whole front end of the car at higher speeds...and once the motion is enough, it continues to shake regardless of driver input...you have to let off the gas and wait for the momentum to slow down...you can feel it coming...sorry for the long post, but i want to get to the bottom of it...i must also mention that my alignment is really off...no, like REALLY off!...is it an alignment issue? or something else? ive never heard/read anything about front end susp. pieces causing such problems...was it the choice in tc rods? too thick maybe? any help would be greatly appreciated...tia

Dousan_PG · 01-06-2006, 05:37 PM

get balanced
alignment

and that should mroe then likely fix it!

slideways2004 · 01-06-2006, 08:55 PM

Quote:

Originally Posted by Dousan_PG

get balanced
alignment

and that should mroe then likely fix it!

what he said. the alignmetn will make sure the t/c rods are even and at the degree they need to be

sw20>>s14 · 01-07-2006, 12:53 PM

gettin alignment today...hopefully its just what my car needs...haha i cant wait to get the spec sheet and see the guys face...my current alignment is rediculous...

thanks for the reassurance guys...

P4rD0nM3 · 01-07-2006, 01:05 PM

Hey uhm, i'm just wondering if your rims have hubcentric rings on them...

RedtopTech · 01-07-2006, 01:17 PM

check and make sure that all suspension bolts are tightened to spec as well. LOSE BOLT CAN CAUSE SUSPENSION COMPONENTS TO VIBRATE AT THERE resonance FREquency which is usually between 45-80MPH.

Bryants95240sx · 01-07-2006, 03:01 PM

You know i had the same problem on my zenki after installed nismo power brace,tein tie rods,and tension rods. I had alignment and tires balanced. Still did not get rid of thevibration at 75-80. I never could figure out what it was. I sold that car though and have a kouki now.And i had hubcentric rings too.

P4rD0nM3 · 01-07-2006, 08:40 PM

You guys are making me double think about installing my Kazama's...

!Zar! · 01-07-2006, 11:06 PM

On my s13 I installed a brace, tension, flca, removed sway. And my alignment was horribly off. Never had any sort of vibration like you are describing. With stiffer tension rods, you will get more road feel but you hardly notice it unless you drive over something. Like a road reflector. But all in all. I'm 75% sure it's alignment and balance. Sure all your screws are tight? ;D

tripleb · 01-08-2006, 09:24 PM

its got to be the alignment, when ever you put on any parts that modify the suspension geometry you need to align it properly. and also make sure everything was tight lugnuts and all.

01-06-2006, 04:45 PM	#1
sw20>>s14 Post Whore! Join Date: Jan 2005 Location: bay area Posts: 5,656 Trader Rating: (19) Feedback Score: 19 reviews	violent shaking after susp. goes on??!! i just installed a tanabe sustec front strut bar, nismo powerbrace, and fatty uras tension rods simultaneously...at first, my wheel and tire specs were messed up...i was running 16"/15", 245/50/16 and 205/45/15, and not balanced (borrowed from a friend waiting for tires to be put on)... so the first test drive with the aforementioned specs was relativeley good...very tight front end and responsive steering...but when i got on the highway, the second the needle pasted 60mph, it shook VERY violently...i mean to the point where i couldnt drive...so my friend and i assumed that since the wheels were not balanced, now the vibrations were traveling from the knuckle->tc rods->powerbrace->straight to the chassis...meaning theres no more give and transfer of force to chassis is no longer being loss in bushings and deflection...opposed to the bushings and weak stock tc rod brackets taking all the motion... okay, no big deal...so i slap on my other wheels which are 16x7 with stock 205/55/16...just mounted tires on all four and balanced...it was okay for the first day, but sometimes it still does the shaking...last night on the highway it would shake every now and then...and i mean hard...imagine my toolset in my pass. seat, it sounded like a ton of marbles in those cookie tins...but now, it shakes at higher speeds e.g. 65-70mph... it almost feels like the motion builds up and finally shakes the whole front end of the car at higher speeds...and once the motion is enough, it continues to shake regardless of driver input...you have to let off the gas and wait for the momentum to slow down...you can feel it coming...sorry for the long post, but i want to get to the bottom of it...i must also mention that my alignment is really off...no, like REALLY off!...is it an alignment issue? or something else? ive never heard/read anything about front end susp. pieces causing such problems...was it the choice in tc rods? too thick maybe? any help would be greatly appreciated...tia __________________ s14\| y34\| 911 gts\| exige s\| 600rr\| r3\| 250r\| 85 girlfriend

01-06-2006, 05:37 PM	#2
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	get balanced alignment and that should mroe then likely fix it! __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

01-07-2006, 12:53 PM	#4
sw20>>s14 Post Whore! Join Date: Jan 2005 Location: bay area Posts: 5,656 Trader Rating: (19) Feedback Score: 19 reviews	gettin alignment today...hopefully its just what my car needs...haha i cant wait to get the spec sheet and see the guys face...my current alignment is rediculous... thanks for the reassurance guys... __________________ s14\| y34\| 911 gts\| exige s\| 600rr\| r3\| 250r\| 85 girlfriend

01-07-2006, 03:01 PM	#7
Bryants95240sx Zilvia Addict Join Date: Feb 2004 Location: alabama Age: 37 Posts: 668 Trader Rating: (0) Feedback Score: 0 reviews	You know i had the same problem on my zenki after installed nismo power brace,tein tie rods,and tension rods. I had alignment and tires balanced. Still did not get rid of thevibration at 75-80. I never could figure out what it was. I sold that car though and have a kouki now.And i had hubcentric rings too. __________________ Last edited by Bryants95240sx; 01-07-2006 at 09:47 PM..

01-07-2006, 11:06 PM	#9
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	On my s13 I installed a brace, tension, flca, removed sway. And my alignment was horribly off. Never had any sort of vibration like you are describing. With stiffer tension rods, you will get more road feel but you hardly notice it unless you drive over something. Like a road reflector. But all in all. I'm 75% sure it's alignment and balance. Sure all your screws are tight? ;D __________________

01-07-2006, 01:05 PM	#5
P4rD0nM3 Zilvia FREAK! Join Date: Jun 2005 Location: Not Applicable Posts: 1,183 Trader Rating: (0) Feedback Score: 0 reviews	Hey uhm, i'm just wondering if your rims have hubcentric rings on them...

01-07-2006, 01:17 PM	#6
RedtopTech Zilvia Member Join Date: Dec 2005 Location: Virginia Beach, VA Age: 40 Posts: 293 Trader Rating: (0) Feedback Score: 0 reviews	check and make sure that all suspension bolts are tightened to spec as well. LOSE BOLT CAN CAUSE SUSPENSION COMPONENTS TO VIBRATE AT THERE resonance FREquency which is usually between 45-80MPH.

01-07-2006, 08:40 PM	#8
P4rD0nM3 Zilvia FREAK! Join Date: Jun 2005 Location: Not Applicable Posts: 1,183 Trader Rating: (0) Feedback Score: 0 reviews	You guys are making me double think about installing my Kazama's...

01-08-2006, 09:24 PM	#10
tripleb Join Date: Jan 2006 Location: midland, MI Age: 46 Posts: 45 Trader Rating: (0) Feedback Score: 0 reviews	its got to be the alignment, when ever you put on any parts that modify the suspension geometry you need to align it properly. and also make sure everything was tight lugnuts and all. __________________ " I am a firm believer in a ruling clas........espcially since i rule"