Cls 400 7g- tronic problem
Thread Starter
Newbie
Joined: Dec 2021
Posts: 12
Likes: 5
From: Poland
Cls400 15*
Cls 400 7g- tronic problem
gentlemen, I need help. I have been feeling vibrations in the cabin for some time. the mechanic claims that they come from the gearbox. the wheels were checked and balanced. brakes too. vibrations are felt most at the speed of 70-90mph under load. vibrations are transmitted throughout the car and you can feel them under the driver's seat, not on the steering wheel. Anyone had a similar problem? the gearbox is a 7g tronic, 4 matic drive.
the problem becomes more acute when I put on 20 inch wheels. currently, on winter tires and 18-inch rims, vibrations are less noticeable but still at the same speeds, or in the range of 2300-2600 rpm
the problem becomes more acute when I put on 20 inch wheels. currently, on winter tires and 18-inch rims, vibrations are less noticeable but still at the same speeds, or in the range of 2300-2600 rpm
Out Of Control!!
Joined: Sep 2018
Posts: 14,668
Likes: 4,570
From: unbegrenzt
2017 GLE350 4MATIC
You need more diagnostic information.
Only at one speed?
Only at constant speed? What about accelerating, decelerating or braking?
Vibration in steering wheel?
Vibration in brakes?
Vibration increases or decreases when swerving left or right at highway speeds?
Vibration increases or decreases when braking?
Vibration increases or decreases when steering sharp corners (parking lot)?
Vibration coming from front or rear of car?
Vibration coming from left or right side of car?
Only at one speed?
Only at constant speed? What about accelerating, decelerating or braking?
Vibration in steering wheel?
Vibration in brakes?
Vibration increases or decreases when swerving left or right at highway speeds?
Vibration increases or decreases when braking?
Vibration increases or decreases when steering sharp corners (parking lot)?
Vibration coming from front or rear of car?
Vibration coming from left or right side of car?
Thread Starter
Newbie
Joined: Dec 2021
Posts: 12
Likes: 5
From: Poland
Cls400 15*
Chassis thank you for your interest.
Vibration occurs from a speed of 120-140 km / h. They occur when the car is under load, if it turns on the cruise control at a speed of 130 km / h, the vibrations stop significantly, but they occur cyclically, e.g. 2 seconds vibrates, 2 seconds pause, 2 seconds vibrates, 2 seconds pause, etc.
Vibrations do not affect the brakes on the steering wheel
Vibration increases when swerving left or right at highway speeds.
They do not occur at low speeds and in the parking lot.
The vibrations come from the center of the car.
Vibration occurs from a speed of 120-140 km / h. They occur when the car is under load, if it turns on the cruise control at a speed of 130 km / h, the vibrations stop significantly, but they occur cyclically, e.g. 2 seconds vibrates, 2 seconds pause, 2 seconds vibrates, 2 seconds pause, etc.
Vibrations do not affect the brakes on the steering wheel
Vibration increases when swerving left or right at highway speeds.
They do not occur at low speeds and in the parking lot.
The vibrations come from the center of the car.
Senior Member
Joined: Apr 2008
Posts: 303
Likes: 15
2011 E550 (RIP), 2014 CLS 550C4
Determine if the vibration is speed dependent or RPM dependent. If it is speed dependent try running the car at 70-90 but manually shift the trans into 6th or 5th. If it is RPM dependent it should do it between 2300-2600 regardless of vehicle speed.
Do your winter and 20" tires have the same diameter as the "stock" tires? Do your winter and 20" wheels have the same offset's as the stock wheels?
Do your winter and 20" tires have the same diameter as the "stock" tires? Do your winter and 20" wheels have the same offset's as the stock wheels?
Thread Starter
Newbie
Joined: Dec 2021
Posts: 12
Likes: 5
From: Poland
Cls400 15*
summer wheels have a greater offset. while the tires are selected according to the calculator.
Front 8 inch tire 245/30 (et30)
rear 10 inch tire 295/25 (et32)
The circumference of the wheel is the same (error within 1% tolerance)
However, vibration also occurs on summer and winter tires on original amg rims: (I did tests because I have 3 sets of wheels)
Front 8.5 inch tire 255/40 r18 (et37)
rear 9.5 opoina 285/35 r18 (et47)
Winter tires all 8.5 inch 255/40 R18 (et37)
On the other hand, on 18 inch rims (summer and winter tires), the vibrations are softer.
vibrations depend on the revolutions in the range of 2300-2600 as you write, but the higher the speed, the more it is felt.
Front 8 inch tire 245/30 (et30)
rear 10 inch tire 295/25 (et32)
The circumference of the wheel is the same (error within 1% tolerance)
However, vibration also occurs on summer and winter tires on original amg rims: (I did tests because I have 3 sets of wheels)
Front 8.5 inch tire 255/40 r18 (et37)
rear 9.5 opoina 285/35 r18 (et47)
Winter tires all 8.5 inch 255/40 R18 (et37)
On the other hand, on 18 inch rims (summer and winter tires), the vibrations are softer.
vibrations depend on the revolutions in the range of 2300-2600 as you write, but the higher the speed, the more it is felt.
Senior Member
Joined: Apr 2008
Posts: 303
Likes: 15
2011 E550 (RIP), 2014 CLS 550C4
Try some additional tests.
Place the transmission in M. From a dead stop accelerate gently and see if the vibration presents between 2300 and 2600. Manually shift into 2nd gear around 2700. Accelerate gently through 2300 and 2600 again to see if the vibration presents, then shift into 3rd and repeat. If you have enough room do the same in 4th, 5th, etc. Repeat tests under moderate acceleration, and again under heavy acceleration.
If you can get the vibration to present itself always between 2300 and 2600, regardless of speed, it suggests the problem isn't the wheels and tires, especially since you've tried 3 different sets.
Place the transmission in M. From a dead stop accelerate gently and see if the vibration presents between 2300 and 2600. Manually shift into 2nd gear around 2700. Accelerate gently through 2300 and 2600 again to see if the vibration presents, then shift into 3rd and repeat. If you have enough room do the same in 4th, 5th, etc. Repeat tests under moderate acceleration, and again under heavy acceleration.
If you can get the vibration to present itself always between 2300 and 2600, regardless of speed, it suggests the problem isn't the wheels and tires, especially since you've tried 3 different sets.
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Thread Starter
Newbie
Joined: Dec 2021
Posts: 12
Likes: 5
From: Poland
Cls400 15*
the wheels and tires are definitely not the problem, we've already checked it. during ecu tuning the first power measurement showed over 410 horsepower but we had to reduce the power as the vibrations were even more noticeable. so the problem is either the engine or the gearbox. My tuning specialist claims it is a gearbox.
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Out Of Control!!
Joined: Sep 2018
Posts: 14,668
Likes: 4,570
From: unbegrenzt
2017 GLE350 4MATIC
Chassis thank you for your interest.
Vibration occurs from a speed of 120-140 km / h. They occur when the car is under load, if it turns on the cruise control at a speed of 130 km / h, the vibrations stop significantly, but they occur cyclically, e.g. 2 seconds vibrates, 2 seconds pause, 2 seconds vibrates, 2 seconds pause, etc.
Vibrations do not affect the brakes on the steering wheel
Vibration increases when swerving left or right at highway speeds.
They do not occur at low speeds and in the parking lot.
The vibrations come from the center of the car.
Vibration occurs from a speed of 120-140 km / h. They occur when the car is under load, if it turns on the cruise control at a speed of 130 km / h, the vibrations stop significantly, but they occur cyclically, e.g. 2 seconds vibrates, 2 seconds pause, 2 seconds vibrates, 2 seconds pause, etc.
Vibrations do not affect the brakes on the steering wheel
Vibration increases when swerving left or right at highway speeds.
They do not occur at low speeds and in the parking lot.
The vibrations come from the center of the car.
No noise while steering means front halfshafts are ruled out.
It's either propshaft joints or support, halfshafts or wheel bearings. Wheel bearings are a somewhat common failure item.
Is there vibration when swerving left and right at highway speed with your foot off the accelerator pedal (no cruise control)?
Last edited by chassis; Jan 4, 2022 at 08:35 PM.
Junior Member
Joined: Dec 2008
Posts: 69
Likes: 24
From: florida
CLS400-3"downpipes cls63 exhaust and bbk BMS intake AMR rv3.1, 12.1@119mph 1.9 60'
Road force balance your best set of tires. Check your motor mounts and tranny mount. These trans are very stout, hardly any issues even with double torque limitations.The fact that you say it occurs cycling seems like a bent rim.
Junior Member
Joined: Dec 2008
Posts: 69
Likes: 24
From: florida
CLS400-3"downpipes cls63 exhaust and bbk BMS intake AMR rv3.1, 12.1@119mph 1.9 60'
gentlemen, I need help. I have been feeling vibrations in the cabin for some time. the mechanic claims that they come from the gearbox. the wheels were checked and balanced. brakes too. vibrations are felt most at the speed of 70-90mph under load. vibrations are transmitted throughout the car and you can feel them under the driver's seat, not on the steering wheel. Anyone had a similar problem? the gearbox is a 7g tronic, 4 matic drive.
the problem becomes more acute when I put on 20 inch wheels. currently, on winter tires and 18-inch rims, vibrations are less noticeable but still at the same speeds, or in the range of 2300-2600 rpm
the problem becomes more acute when I put on 20 inch wheels. currently, on winter tires and 18-inch rims, vibrations are less noticeable but still at the same speeds, or in the range of 2300-2600 rpm
