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05-29-2008, 03:48 PM | #1 |
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Why is the roadster lighter than the coupe?
Just looking at my 2008 Car Buyer's guide and noticed that the Z4 roadster and M roadster are around 15kg lighter than their coupe counterparts, but the opposite is true for most other soft top convertibles when compared to their coupe counterparts. Just some examples:
- 650i soft top convertible is around 200kg heavier than 650i coupe - Aston Martin Vantage convertible is heavier than Vantage coupe - Audi A4 convertible is heavier than A4 sedan There are many other examples where soft top convertibles are heavier than the coupes. Can anyone explain why the Z4's are the exception? Last edited by takedown8; 05-29-2008 at 05:41 PM.. |
05-29-2008, 04:58 PM | #6 |
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maybe they change something in the other car bodies to compensate for the loss of stiffness because there is no roof ? just a guess
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05-29-2008, 05:12 PM | #7 |
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It's because the car was originally designed as a roadster. Most Vert's are derived FROM a coupe, so when the roof is removed, additional support brackets and cross members have to be installed to maintain rigidity. In the Case of the Z, all the cross-bracing and reinforcement is still in the coupe, with the addition of the steel top. Thus, more weight, not less.
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05-29-2008, 05:42 PM | #8 | |
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05-29-2008, 06:00 PM | #9 | |
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05-29-2008, 07:39 PM | #10 | |
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05-29-2008, 07:41 PM | #11 |
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It could just be because guys weigh more than girls. The cars probably weigh the same, the driver is the difference
edit: This generalization excludes Rick Hunter's "girl"
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05-29-2008, 08:16 PM | #12 | |
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05-29-2008, 08:26 PM | #13 |
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Part numbers are different...
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05-29-2008, 08:28 PM | #14 | |
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05-29-2008, 09:06 PM | #15 |
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rear hatch glass must also weigh a ton.
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05-30-2008, 06:47 AM | #16 |
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05-30-2008, 08:15 AM | #18 |
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One of the design "features" of the Coupe that I've never liked, and that adds to its weight and betrays its Roadster origins, is the presence of the rear bulkhead all but completely blocking access between the passenger compartment and the back hatch. While I'm sure this adds to the rigidity of the frame, a coupe designed from scratch wouldn't have this annoying blockage or the added weight.
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05-30-2008, 08:42 AM | #19 | |
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05-30-2008, 08:44 AM | #20 |
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Without assumptions...engineers couldn't do much...
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05-30-2008, 09:55 AM | #22 | |
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