My Q45 starts to vibrate while driving at highway speeds. The vibration becomes pronounced when taking curves. I recently replaced the tires and the problem still exist. I feel it in the entire vehicle. I have 168K and have never replaced the driveshaft or motor mounts. I have replaced the transmision mount.
Boudreaux
VIBRATION @ HIGHWAY SPEEDS ????????
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maxnix
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1995 Infiniti Q45t
2000 Infiniti Q45
Re: VIBRATION @ HIGHWAY SPEEDS ???????? (BOUDREAUX)
Kindly tell us about your suspension maintenance, kind of tires, how balanced, check for wheel imbalance, when it last dd not vibrate?
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elwesso
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Re: VIBRATION @ HIGHWAY SPEEDS ???????? (maxnix)
You need to see if its from the drivetrain or from the suspension. Jack the rear end so the rear wheels are off the ground and see if thats the problem.
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Q45tech
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: VIBRATION @ HIGHWAY SPEEDS ???????? (elwesso)
In order to diagnose over INET one needs to be so very very specific and supply exact data. Tire size, brand, tire temperature, dozens of things that typical owner doesn't have a way to measure.
If you supply the speed and vibration frequency and amplitude waveforms we could easily tell you.
http://www.qsl.net/dl4yhf/spectra1.html
The above is a free and very exotic audio frequency analyser which can be downloaded to a laptop and the internal sound card [better external usb QUALITY sound card] can be driven via a vibration sensor or quality CONTACT microphone to measure vibrations, frequency and amplitude.
Consider you are feeling the vibrations not hearing them so they run from 1Hz to < 100Hz. Microphones have a hard time below 30 Hz.
Tires vibrate around 13 HZ and have multiples 13, 26, 39 Hz.
Everything that rotates has a vibration frequency .......................the spings and car body oscillate up and down ~~1.0-1.2 Hz...........lowering springs increase the frequency to 1.4-1.5 HZ
If you supply the speed and vibration frequency and amplitude waveforms we could easily tell you.
http://www.qsl.net/dl4yhf/spectra1.html
The above is a free and very exotic audio frequency analyser which can be downloaded to a laptop and the internal sound card [better external usb QUALITY sound card] can be driven via a vibration sensor or quality CONTACT microphone to measure vibrations, frequency and amplitude.
Consider you are feeling the vibrations not hearing them so they run from 1Hz to < 100Hz. Microphones have a hard time below 30 Hz.
Tires vibrate around 13 HZ and have multiples 13, 26, 39 Hz.
Everything that rotates has a vibration frequency .......................the spings and car body oscillate up and down ~~1.0-1.2 Hz...........lowering springs increase the frequency to 1.4-1.5 HZ
Re: VIBRATION @ HIGHWAY SPEEDS ???????? (maxnix)
Bridgestone (OEM ACT Wheels) 5 months ago w/ dynamic spin balanceOEM link kits 9 months agoOEM front torsion bars 7 months agoFront struts (Tokico) 1 year ago
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maxnix
- Posts: 22627
- Joined: Mon Jul 22, 2002 8:11 pm
- Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45
Re: VIBRATION @ HIGHWAY SPEEDS ???????? (BOUDREAUX)
Torsion bars mean tension rod bushings or rods?
Only front shocks replaced with Blues? Strange because rears go first.
Link kits is upper link in front or sway bar links?
Which Bridgestone and what size? How many miles in 5 months? Nowminal psi? ACT wheel? Spun and measured by itself?
A little more and we might have some guesses. Give us some speeds in gear where it occurs. Presume no vibrations previoulsly until Bridgestones were installed?
Only front shocks replaced with Blues? Strange because rears go first.
Link kits is upper link in front or sway bar links?
Which Bridgestone and what size? How many miles in 5 months? Nowminal psi? ACT wheel? Spun and measured by itself?
A little more and we might have some guesses. Give us some speeds in gear where it occurs. Presume no vibrations previoulsly until Bridgestones were installed?