New BMW 7-series will come with 8-speed transmission - Page 4

EnI

Quote:

Originally Posted by Imhotep Evil

But it will be still an automatic were the last 2 gears will be meaningless.

Perhaps performance wise. But you'll able to get better mileage (+6%), and pollute less (more than 10% less CO2).

vabboud

well if the elctronics are smart enough to shift at the needed time, and to choose the exactly needed gear, the top 2 gears will be meaningless
it's a abttle of electronics, you can ahve 4 gears with idiotic electronics, and find yourself in 4th only 1% of the time, and an 8 gear box with samrt head that will use the full spectrum exactly when needed

Imhotep Evil

Quote:

Originally Posted by EnI

Perhaps performance wise. But you'll able to get better mileage (+6%), and pollute less (more than 10% less CO2).

I was talking about McTronic 9G. So will it also give +6% economy -10% CO2 ?!

Just_me

PRess relese about the new 8-speed gearbox

- ONLY REGISTERED AND ACTIVATED USERS CAN SEE ALL LINKS - CLICK HERE TO REGISTER

- the gearbox can handle up to 850 nm

- Same weight (90kg) as the 6-gear automatic that exist today

- Change from gear 8 to gear 2 without going through 6,5 and 4 gear like other existing 6-gears automatics does today.

- With this 8 gear its possible to go to directly to any gear with "higher gear speed"

- Lockup from gear 2 to 8 is possible

gear-ratios
1an 4.70
2an 3.13
3an 2.10
4an 1.67
5an 1.29
6an 1.00
7an 0.84
8an 0.67

888

I don't think cars should have more than 6-speed transmission ://

Just_me

Quote:

Originally Posted by 888

I don't think cars should have more than 6-speed transmission ://

I bet people said the same when there existed only 5-gears

ZicZachZo

I would assume that we don't see manual gearboxes with more than 6 speeds because I would imagine that it would be kind of tedious to really drive it and have to change all of those gears. The reason I'm thinking about this is because I know that in the MB 7speeder if you mash your foot to the floor it will skip as much as like 3 gears. Kind of crazy. I dunno much about trannys though so I don't know if what I'm talking about really makes any sense!

bmer

Quote:

Originally Posted by ZicZachZo

I would assume that we don't see manual gearboxes with more than 6 speeds because I would imagine that it would be kind of tedious to really drive it and have to change all of those gears.

Yeh, that is the main reason I think. I was too lazy to look for more info on manual trannys with more than 6 gears with a search engine so here's a quote from Wikipedia:

Quote:

Originally Posted by Wikipedia

Contemporary automotive manual transmissions are generally available with four to six forward gears and one reverse gear, although manual transmissions have been built with as few as two and as many as eight gears. Semi tractors have at least 13 gears and as many as 24.

BMW_Dude

Quote:

Originally Posted by ZicZachZo

I would imagine that it would be kind of tedious to really drive it and have to change all of those gears.

You say that, but my push bike has 24 gears, sure I use mainly top gear, but still!

Interestingly MB make a push bike with an automatic gearbox, I can't imagine what that would be like to use!

cawimmer430

Quote:

Originally Posted by TycoonGTR

What's next? Mercedes strikes back with 16spd tranny...?

18-speed tranny. It's going to be called the 18Gtronic.