Quote:
Originally Posted by IanAnderson  Wanni
That gearbox looks very interesting - to an untrained accountants eye.
What is the reason for increasing the number of gears? Is it purely to give a lorer RPM at cruising or is it for some other technical reason?
I have heard that with the bigger RPM changes during gear change the syncro works harder but surely that is the syncros job. Unless this causes excessive wear or some other roblem.
As I say it all interests me but I am far below your technical skill and ability.
Thanks
Ian. |
About why 7 speeds, I have already answered.
Let us go in the fine tuning of a gearbox, because you reached the point with the synchros questions.
Generally the synchros best operation is always a compromise for the development engineers.
As you can understand, you can build a confortable gearbox at medium revs ( which is usually the target ) accepting the fact it is miss used at high revs.
Why??? always because the target is to neet the 50% driver requirements, who is principally using the vehicle accordingly to the street regulations with some exceptions regarding sporadic sportly tries.
Normally an engine is reving 7.000 revs and up or down shifting at 2.500 is a bit out of routine. If I set up the best shifting for this range of revs, I can forget to engage any gear at 7.000, for exception by by passing the synchros. if I set up the best at 7.000 ten i will be in trouble at low revs to unlock the rings for the final ingagement, after the synchronisation point, for excess of power.
If you are used to drive constantly in a sportly mode, you shall contact a center where experts can customise the synchronisation to your personal needs.
I would build the activator springs much harder in order to keep synchronising but also I would increse the oil cooling for the rings in order to do not burn everything.
By removing the clutch damper I would reduce the clutch disk inertia and I would use a specific hi quality lubricant.
A small investement for the sportly driving pleasure.
Cheers
Wanni