J'ai eut une reponse via l'adresse virgin.
J'ai posé une question concernant la fourniture d'une BV6, ou d'un retrofit de ma boite 5.
Voici leur réponse:
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Hello Laurent,
We don't do any work on the Caterham 6 speed gearbox even though we designed it.
So we don't stock 6 speed and parts.
The 6 speed gearbox was design by us to turn the low powered 1.4 K series engine in to a screamer.
Having 6 gear in the ratio of the normal 4 gears of a Type 9. I.e. it has no overdrive.
Bigger the engine and more power and torque less gear changes the engine need to get it up to speed, so no wasting time changing gear unnecessary.
What we specialise in is close ratio 5 speed gearboxes.
We do a number of different ratio for the type 9 gearbox which are all listed on the web site from road to race ratios.
The prices are also on the web site.
Have a look at the follow Web page and contact me to answer your questions.
http://www.bghgeartech.co.uk/html/5_speed.html
Hope this help
Many Thanks
Chris
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Bref ils font des BV5, et ils préconisent de rester bv5...
Je continue de creuser le sujet...