Drivetrain issue

[peets500]

Good day,

I was wondering if any of you have experienced this scenario: Upon hard acceleration, the rear of the car seems to slightly veer to the right side, then when I release the accelerator pedal it immediately jerks back. It's not noticeable during slow speeds. I'm running 18" Brabus rims with new tires. I'm wondering if it's a differential issue.

Thank you in advance.

Pete

 

[gsxr]

That's suspension / alignment, not differential. Check the condition of ALL the rear links, bushings, and rear wheel carrier support joint. If everything is tight, next is an alignment check.

 

[jftu105]

The car may not have any issues. It could be just a matter of vehicle dynamics. When accelerating hard, a huge engine torque is needed. This torque via the drive train is applied to the differential from the engine, and the differential distributes it to the left and right tires. However, this torque does two things. First, it turns the sprung mass (car body roll) and second, it causes a lateral weight shift (which reduces the acceleration performance with an open differential). Your sense of veering to the right could be just the feeling of the body roll, not the actually slip in the rear tires. If so, you would be oversteering when accelerating hard. Oversteering is still a possibility if the lateral weight shift is substantial. The lateral weight shift reduces the overall frictional force in the lateral direction to keep the car straight. With high acceleration, there will be very little available frictional left to resist slip in the lateral direction. To reduce the body roll and lateral weight shift, try to increase the anti-roll bar stiffness, both front and rear, but the rear will be more significant.

jftu105

 

[TerryA]

That's suspension / alignment, not differential. Check the condition of ALL the rear links, bushings, and rear wheel carrier support joint. If everything is tight, next is an alignment check.

+1 I agree w/ gsxr no 500E that I know of has this problem certainly not mine. Something is amiss back there.

I only recall one 500E I thought was weird handling. It had H&R lowering springs X4 corners. When I test drove it on the freeway in SoCal it kinda did a hula at the rear when it hit a dip at freeway speeds. Needless to say I didn’t buy the car.

lol

 

[gsxr]

If steering corrections are needed after either on/off throttle, OR after hitting a bump/dip, something is wrong. Neither of these should cause the car to not track straight.

Now if it just feels like the car is moving around, but no steering input is needed, that's a different discussion.