Any way to seat cushions firmer? - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 03-13-2019, 03:13 PM Thread Starter
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Any way to seat cushions firmer?

Hi,

Although I really like the comfort in my MY98 SL500, I think the seats are just too soft.
Has anyone done anything to firm up their seat cushions by eg. adding more springs, adding firmer foam or anything else like that?
It would be really interesting to hear if anything can be done to help make the seats feel more like seats in a modern car.

Thanks!
Anton
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post #2 of 9 (permalink) Old 03-13-2019, 03:42 PM
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Too soft seats in a Mercedes. Never thought I would hear that phrase. I have always thought MB seats to be on the firm side based on owning over 50 years of MB's.

Visit with an auto upholsterer and see what they could do replacing the padding with something firmer?
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post #3 of 9 (permalink) Old 03-13-2019, 11:32 PM
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Every ass is different I guess but I always thought MB seats were on the soft side. Going back to 450 SEL, 420SEL, few W124s… granted those were pre-owned cars and seats weren't new… still felt soft. When I bought R129 I thought the seats were much better than anything MB I've owned before… until I bought low millage W211. These seats are really firm, just the way I like it… and made R129 feel too soft again.

I guess the best you can do is put brand new OE cushions. I don't think new springs will make much difference. You could also switch passenger and driver seats, which is pretty easy to do.

Andrew
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post #4 of 9 (permalink) Old 03-14-2019, 02:38 PM
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Hi.
I have adjusted the seat to my weight level by trying foam with different hardness grades.

At the bottom the (very soft) original, middle is my choice and the one on top was almost zu hard (also to cut with my equipment)
Happy experimenting!

Cheers Frank
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post #5 of 9 (permalink) Old 03-16-2019, 06:28 PM
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I bought new MB replacement bottom foam bolsters.
After 20 yeats, the foam was pretty well broken down.
My upholstery shop easily replaced them.
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post #6 of 9 (permalink) Old 03-16-2019, 06:43 PM
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The passenger seat bottom, since not used often, usually remains very very firm. I swapped the passenger and the driver's bottom cushions and feels like a "new" and firmer seat (almost too firm), but got used to it after few weeks.

Regards,
D
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post #7 of 9 (permalink) Old 03-17-2019, 01:19 AM
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Quote:
Originally Posted by duh_vinci View Post
The passenger seat bottom, since not used often, usually remains very very firm. I swapped the passenger and the driver's bottom cushions and feels like a "new" and firmer seat (almost too firm), but got used to it after few weeks.

Regards,
D
I think this a a placebo effect only.
Springs in the seat, like in a chassis suspension, have no damping functionality, the seat formpiece not either.
But as you are saying, even the mostly unused passenger seat (so considered new and designed for a 70 kg person) is not as firm as it shoud be.
Replacing the standard foampiece, or putting additional foamblocks into each spring, is from my perspective the only (easy) way.

Cheers, Frank

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post #8 of 9 (permalink) Old 03-17-2019, 04:17 AM
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Quote:
Originally Posted by Frank_S500 View Post
I think this a a placebo effect only. ...
Cheers Frank!

Going to respectfully disagree with you on the placebo effect. It's not the springs (that I'm with you, you make a good point), it is the tired foam that does make a difference.

I have stretched new leather skin onto the bottom cushion, and repaired the stitching split on the other seat, there was a considerable (imo) difference in the "unused foam" of the passenger seat and well utilized 100k miles of the driver's foam



And I could visually see the difference in the passenger and driver's foam pieces height and how well it bounced back. Sticking with my "ass knows what it felt"

With that said, however, inserting the new, firmer foam at the base of the actual frame is easy enough to improve even further for sure

Regards,
D
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post #9 of 9 (permalink) Old 03-17-2019, 05:13 AM
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Hi, D.

I must admit I had only the newer seats in my hands.
The hard coconutfibre formpiece carrier has only 1,5 cm foam between the cushion, which has mainly visual and haptic reasons.
So removed this part in my consideration right away.
Of course if the earlier models have thicker and firmer foam between carrier an cushion, this has also some effect.

Cheers, Frank

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