Cayman vs boxster - Page 2 - Porsche General - PistonHeads"The Boxster chassis has been designed specifically as a convertible from the get go unlike many other convertibles which are sedans with their roofs chopped off, there is hardly any extra stiffness to be had in the Cayman."
I'm not sure about this. Where'd you get this info? Porsche says the Cayman has 40% more torsional rigidity then the Boxster. To me that's significant and noticeable.
"A bit google suggests stiffnesses of (in NM/deg):
early MX5 4,800
Elise s1 10,000
BMW e46 coupe/saloon 13,500 - 16,000
Ferrari 360 23,000
Z4 Coupe 28,000
We know cars are getting stiffer. I wouldn't say stiffer is automatically better. There are some brilliant cars out there with poor torsional stiffness (by today's standards) - mx5, 205gti, elise. Even the e46 comes in less stiff than a Boxster and I never heard any complaints about them.
Cornering loads are small compared to this. Consider that a boxster weighs about 1300kgs, say 1600 fully loaded (and to make the calcs easier). It can corner at about 1g, creating a centripetal force of about 1600N. The rigidity is 16,000 NM/deg. Assuming the cornering load is shared between the two outer wheels alone and pessimistically assuming the chassis is 45 degrees to the load (unlikely unless you're russ swift). That equates to 400/16000 = 0.025 degrees of flex. If a cayman flexes half that, do you really think you'll notice that extra 0.0125 degrees? (Feel free to correct me if my engineering maths is wrong, it's been a while!).
Porsche want you to feel slightly better about the Cayman so you'll pay a premium to buy them. If it didn't have some mythical handling advantage, you'd just buy the cheaper boxster. IMHO it's 99% marketing hype, 1% real world."
"Unlike many convertibles, the Boxster and Cayman were developed to cope without a roof from the outset, meaning the handling differences between the two are minimal. If you really throw both down a road with enthusiasm, the Cayman reveals itself to still be the marginally more stiff of the two.
That’s nit-picking of the highest order, however – both cars are staggeringly good from behind the wheel.
- See more at: https://www.carwow.co.uk/blog/porsche-boxster-vs-cayman-0390#sthash.dRJqMKkU.dpuf"