OmarTT

Why does the TT have a speed limiter? Do you European TTs have a speed limiter ?

Agent002

..well, my 1999 BMW Z3 2.3 Roadster automatic is electronically limited at 128mph.

OmarTT

Not really, why can Porsches reach top speed then ?

Franck BulliTT

Does not concern Porsches, Ferraris, ...
It is just a kind of (not written) agreement between constructors and... I don't know who...maybe a kind of deal with governments in Europe.
Anyway, all "general" constructors limit their cars at 155 mph voluntarily.

Mark Douglas (UK)

....Ferrari and Porsche are a couple of the major exceptions. It was done in the hope of preventing government intervention as power and possible top speeds keep increasing.

Interestingly, the major motorbike manufacturers are now about to implement the same sort of agreement with a phased introduction. The first level will limit bikes to 186mph. Increasing global concern about the top speed of bikes like the Hayabusa and the Kawasaki ZX12R has prompted the manufacturers to act before governments do.

GREGG

Dealer told me TT limited to 138mph

Hairy One Kenobi

Tyres are generally specced up to 155mph (V rating, I think). If you have a top speed above that, you have to fit special (read "expensive") tyres .. it's cheaper for the manufacturer to add a (generally removable) limiter, and let the new owner bear the cost.