R's Resonant Rear Rumble Rationalized!
#1
R's Resonant Rear Rumble Rationalized!
My 1995 XJR has a low resonating "rumble" that only starts when the car approaches 37mph peaks at 40mph and quiets down around 43mph. It's annoying because this is the typical speed for around-town driving. I eliminated tires and wheel balancing as a root cause and am now focusing on exhaust system mounts/bushing.
A Brit car expert/mechanic friend told me that cars tend to have a unique frequency at the chassis shows resonating vibration (that has to be addressed during design/testing) and for the X300 40mph may very well create this frequency...and therefore exhaust vibration made audible by bad exhaust bushings.
Funnily enough he told me MGBs' resonate at 60mph, a common highway cruising speed.
I am going to explore this further with my XJR, but thought I would share some info that was new to me!
A Brit car expert/mechanic friend told me that cars tend to have a unique frequency at the chassis shows resonating vibration (that has to be addressed during design/testing) and for the X300 40mph may very well create this frequency...and therefore exhaust vibration made audible by bad exhaust bushings.
Funnily enough he told me MGBs' resonate at 60mph, a common highway cruising speed.
I am going to explore this further with my XJR, but thought I would share some info that was new to me!
#3
#4
Took the XJR to my friend's shop (shameless plug: Sports Car Warehouse) and replaced the drive shaft carrier bearing and expansion joint. Problem solved.
Next for replacement transmission mount and missing exhaust mount.
Carrier bearing before replacement
Bad transmission mount
My car among some older British relatives!
Next for replacement transmission mount and missing exhaust mount.
Carrier bearing before replacement
Bad transmission mount
My car among some older British relatives!
The following 2 users liked this post by 95XJRBlack:
Don B (09-13-2014),
MountainMan (09-13-2014)
#5
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