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Read the WELCOME ALL BMWFANATICS post.
320d e90 lci vibration. Please help
- Thread starter Diesel
- Start date
CA_130
///Member
Hi, haven't read the full thread, but if its in the seats and not when stationery it probably in the driveline. Have you checked the flex disks and gearbox mountings?
It could be that at 1800-2000 rpm the car is producing max torque and applying the most force to these parts deforming them slightly and causing an imbalance, hence the vibration.
These are also parts that due fail due to time and use, and I would imagine that diesel torque is not kind to rubber couplings, the fact that the issue is after the car was tuned for more power also points me in this direction, dropping a gear would bring the revs up higher and place less force (torque) on the components as the increase in rotational speed of the driveshaft+engine would mean a dip applied torque and rise in hp
Think of it as pedaling a bicycle up a steady incline, you could leave it in a high gear and mash power through the pedals (this id your car's current default) stressing the drive components, or you could drop a gear, increase your leg speed (cadance/rpm) which is what you are currently doing.
although you will achieve the same speed, the forces going though the components will be less.
TLDR, more drive-train speed, less torque
Just my thoughts
It could be that at 1800-2000 rpm the car is producing max torque and applying the most force to these parts deforming them slightly and causing an imbalance, hence the vibration.
These are also parts that due fail due to time and use, and I would imagine that diesel torque is not kind to rubber couplings, the fact that the issue is after the car was tuned for more power also points me in this direction, dropping a gear would bring the revs up higher and place less force (torque) on the components as the increase in rotational speed of the driveshaft+engine would mean a dip applied torque and rise in hp
Think of it as pedaling a bicycle up a steady incline, you could leave it in a high gear and mash power through the pedals (this id your car's current default) stressing the drive components, or you could drop a gear, increase your leg speed (cadance/rpm) which is what you are currently doing.
although you will achieve the same speed, the forces going though the components will be less.
TLDR, more drive-train speed, less torque
Just my thoughts
Glanny1962
New member
Hi....did you finally resolve the problem? I got the same problem...
Vibration or shudder on low acceleration only, between 40km/hour to around 70km/hour.
So far, replaced guibos/dampers on propshaft, replaced center support bearing on propshaft, changed front shocks, checked and repaired rims, alignment redone, diff and axles checked, no fault codes, lastly as of yesterday did a complete auto transmission kit and oil change.
The vibration/shudder is still there..spent alot of money. Very worrying.
This is a 2011 320d auto bmw. One owner from new.
Vibration or shudder on low acceleration only, between 40km/hour to around 70km/hour.
So far, replaced guibos/dampers on propshaft, replaced center support bearing on propshaft, changed front shocks, checked and repaired rims, alignment redone, diff and axles checked, no fault codes, lastly as of yesterday did a complete auto transmission kit and oil change.
The vibration/shudder is still there..spent alot of money. Very worrying.
This is a 2011 320d auto bmw. One owner from new.
Diesel
Active member
Glanny1962 said:
Hi
The vibration is still present. Just slightly not severe. Remember it's only at that rpm range when heavy load is applied in high gear 6th. Sometimes the gearbox drops to 5th then there's no vibration. Now I just use sport mode when I need the power.
I hope you come right with your car. Did you check your engine mountings?
