[Bahn360Photo]

Originally Posted by DPelletier

Easy answer; it's not


Dave

I'll post a link to your easy answer to show that it's is

[DPelletier]

Originally Posted by Bahn360Photo

I'll post a link to your easy answer to show that it's is

good luck with that; BMW's literature shows a .7 sec 0-60 difference which seems to match up with all the C&D and other road tests for stock Z4's.

while you're looking; here's one -

...and that's the weaker Euro M40i....

[Bigmouth Studio]

[mrvak_vn]

why not have hardtop

[DPelletier]

Originally Posted by mrvak_vn

why not have hardtop

because the extra weight and higher center of gravity are counter productive in a sportscar.....particularly one designed to compete with a Porsche Boxster. I had a SLK350 with a retractable hardtop and while it was a nice car, it just didn't have the driving dynamics of the G29....I suspect the top and related weight was one of the reasons why. The switch back to a soft top was one of the reasons I decided to buy the Z4

2 cents,
Dave

[Westside Guy]

Originally Posted by DPelletier

because the extra weight and higher center of gravity are counter productive in a sportscar.....particularly one designed to compete with a Porsche Boxster. I had a SLK350 with a retractable hardtop and while it was a nice car, it just didn't have the driving dynamics of the G29....I suspect the top and related weight was one of the reasons why. The switch back to a soft top was one of the reasons I decided to buy the Z4

2 cents,
Dave

I could be wrong but I think that the Supra weighs 150 pounds less than the G29 Z4.

[VIERsr]

A coupe is always lighter than its corresponding convertible, has greater torsional rigidity and therefore a better handling. It is no accident that all sports cars are coupes and not convertibles.
http://youwheel.com/home/2016/06/20/...ehensive-list/
The reason the Z4 is only convertible is probably related to the poor sales of the old Z3/4 coupe, people see the Z4 only as a fancy convertible and not as a real sports car.

[DPelletier]

Originally Posted by Westside Guy

I could be wrong but I think that the Supra weighs 150 pounds less than the G29 Z4.

I show the difference as a bit less than that but it doesn't speak to why the G29 is a soft top.... It would be far heavier as a retractable HT. Look at the weights of the 4 series coupe vs. vert.

Dave

[DPelletier]

Originally Posted by VIERsr

A coupe is always lighter than its corresponding convertible, has greater torsional rigidity and therefore a better handling. It is no accident that all sports cars are coupes and not convertibles.
http://youwheel.com/home/2016/06/20/...ehensive-list/
The reason the Z4 is only convertible is probably related to the poor sales of the old Z3/4 coupe, people see the Z4 only as a fancy convertible and not as a real sports car.

Lots of soft tops are real sportscars; the Boxster is as much of a sportscar as you can get.

Dave

[VIERsr]

Originally Posted by DPelletier

Lots of soft tops are real sportscars; the Boxster is as much of a sportscar as you can get.

Dave

The Boxster is a sports car like all cars of that brand, but the sportiest Porsches are all coupes, we never had a 911 GT3 cabrio or a Boxster GT4.

[gkgeiger]

Originally Posted by VIERsr

The Boxster is a sports car like all cars of that brand, but the sportiest Porsches are all coupes, we never had a 911 GT3 cabrio or a Boxster GT4.

Don’t forget the 911 Speedster.

[DPelletier]

Originally Posted by VIERsr

The Boxster is a sports car like all cars of that brand, but the sportiest Porsches are all coupes, we never had a 911 GT3 cabrio or a Boxster GT4.

This is the comment I was referring to; It is no accident that all sports cars are coupes and not convertibles. Clearly this is incorrect and there are dozens of examples of convertible sportscars as you've admitted with the Boxster. I'm not going to get into a debate as to which sportscars are "sportier".


Cheers,
Dave

[VIERsr]

Originally Posted by gkgeiger

Don’t forget the 911 Speedster.

It is not a GT3 convertible, it would be less effective than a GT3 on the track because of the lack of a roof (and therefore stiffness). But Porsche did not build the Speedster to run on the track, it is a different car with a different purpose.
Don't forget that the main chassis upgrades in M cars compared to regular versions are about increasing underbody stiffness, so torsion rigidity is not a secondary issue in terms of handling.

Originally Posted by DPelletier

This is the comment I was referring to; It is no accident that all sports cars are coupes and not convertibles. Clearly this is incorrect and there are dozens of examples of convertible sportscars as you've admitted with the Boxster. I'm not going to get into a debate as to which sportscars are "sportier".


Cheers,
Dave

All the sportiest cars of every make are not convertibles for obvious reasons: a car without a roof is heavier and less rigid, thus less effective. Porsche, Bmw, Ferrari, Lamborghini, McLaren, and so on, when they want to achieve maximum performance they always put a roof. All of them.
Porsche 718 Boxster 19,000 Nm/deg
Porsche 718 Cayman 41,000 Nm/deg
This does not mean that a convertible cannot be sporty or fast or pleasant to drive, but obviously with a top they would be (and are) better on a performance level.
The Boxster is amazing to drive, but the Cayman is even better. Convertible buyers clearly have different priorities, which is understandable.
That said, if you don't want to understand or accept the facts of physics just to defend your purchase, that's not my problem

[BMWGirlFL]

Skyscraper Grey Preview:

https://webfrontend.evecp.bmw.cloud/gyb0n8hf

[gkgeiger]

I almost changed my order to Skyscraper but I still am partial to white. 2 of my favorite cars were white, I never get tired of it.

[Westside Guy]

Originally Posted by gkgeiger

I almost changed my order to Skyscraper but I still am partial to white. 2 of my favorite cars were white, I never get tired of it.

White is a better color for Florida! 😎

[gkgeiger]

Or anywhere.

[gkgeiger]

Besides, I already have a grey car.

[StanDiego]

Originally Posted by BMWGirlFL

Skyscraper Grey Preview:

https://webfrontend.evecp.bmw.cloud/gyb0n8hf

I like it much better than the lighter silver colors. It wouldn't be my first choice but it would be up there.

[BMWGirlFL]

Originally Posted by StanDiego

I like it much better than the lighter silver colors. It wouldn't be my first choice but it would be up there.

Agreed on the Z4! Gorgeous with Shadowline & black or ivory interior.

[JustChris]

I've seen plenty of skyscraper cars in the U.K.

Very classy and easy to maintain colour IMO.

Great option on the refresh.

[BMWGirlFL]

Portimao preview:
https://webfrontend.evecp.bmw.cloud/sfsia7cl