Has anyone changed final drive on manual 545 or 550?
#21
Senior Members
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877398' date='May 13 2009, 09:48 PM
Are there any positives? I can't think of any.
Don't be so negative DD :-)
The negative is the 6th gear (that becomes shorter) and the fact you cannot make short just second, third and fourth gear but just all.
I think on 6 MT you could mod just some gears, but I'm afraid it wouldn't be an easy job
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
You will gain acceleration and performance overall (2.93 gives too long gears, it's not its right ratio imho*)
Because of your negative points, I got just -7% and not -16%.
I was resigned to 3.23 (-10/11 %), when I found -7 at diffsonline
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
*
from factory the car is set to be a confortable and not thirsty car, not as a 645ci.
#22
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by AlexFW' post='877419' date='May 13 2009, 04:09 PM
Don't be so negative DD :-)
The negative is the 6th gear (that becomes shorter) and the fact you cannot make short just second, third and fourth gear but just all.
I think on 6 MT you could mod just some gears, but I'm afraid it wouldn't be an easy job![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
You will gain acceleration and performance overall.
Because of your negative points, I got just -7% and not -16%.
I was resigned to 3.23 (-10/11 %), when I found -7 at diffsonline
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
The negative is the 6th gear (that becomes shorter) and the fact you cannot make short just second, third and fourth gear but just all.
I think on 6 MT you could mod just some gears, but I'm afraid it wouldn't be an easy job
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
You will gain acceleration and performance overall.
Because of your negative points, I got just -7% and not -16%.
I was resigned to 3.23 (-10/11 %), when I found -7 at diffsonline
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
#23
![Default](https://5series.net/forums/images/icons/icon1.gif)
Thanks for the clarification(s). I knew all about the theoretical (ok actual) benefits, but not really for 6th gear. Who's wanting to get more torque out of 6th gear only? I tend to use 6th only for cruising rather than accelerating and therefore want it to be lower revs. If I'm hard on the gas pedal then it'll change down to 4th or 5th automatically and won't change up until over 150mph anyway.
Still a bit (ok a lot) confused about how you see the benefit of this in everyday driving. If you're "giving it some" then you won't be in 6th gear unless you've taken the top speed limiter off.
Still a bit (ok a lot) confused about how you see the benefit of this in everyday driving. If you're "giving it some" then you won't be in 6th gear unless you've taken the top speed limiter off.
#24
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877426' date='May 13 2009, 04:17 PM
Thanks for the clarification(s). I knew all about the theoretical (ok actual) benefits, but not really for 6th gear. Who's wanting to get more torque out of 6th gear only? I tend to use 6th only for cruising rather than accelerating and therefore want it to be lower revs. If I'm hard on the gas pedal then it'll change down to 4th or 5th automatically and won't change up until over 150mph anyway.
Still a bit (ok a lot) confused about how you see the benefit of this in everyday driving. If you're "giving it some" then you won't be in 6th gear unless you've taken the top speed limiter off.
Still a bit (ok a lot) confused about how you see the benefit of this in everyday driving. If you're "giving it some" then you won't be in 6th gear unless you've taken the top speed limiter off.
there is NO BENEFIT to going up numerically for daily driving. it is strictly for increased acceleration. if you drive hard and want a quicker car, then there is a benifit
#25
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by craigm1841' post='877428' date='May 13 2009, 10:21 PM
there is NO BENEFIT to going up numerically for daily driving. it is strictly for increased acceleration. if you drive hard and want a quicker car, then there is a benifit
By final-drive ratio, we are talking about 6th gear aren't we? Or have I grabbed the wrong end of the ballpark ?
#26
Senior Members
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877426' date='May 13 2009, 10:17 PM
Thanks for the clarification(s). I knew all about the theoretical (ok actual) benefits,
but not really for 6th gear.
Stock 6 MT/SMG 545i with 2.93 seems slow in many situations: with (kmh) 70-120-175-240-280-320 gears are TOO long (more than M5, for example, that has 500 HP).
Maybe suitable for the same engine supercharged or a V12, but in my opinion a 175 kmh third and a 240 kmh fourth are too long for this engine.
#27
Members
Thread Starter
Join Date: Mar 2009
Location: Chicago
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2006 550i sport package, manual, black on black w/ anthracite trim, pdc, logic 7, cold weather pkg.
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877443' date='May 13 2009, 03:33 PM
In 6th gear? Only between 150mph and 180mph, because 5th gear takes you all the way to around 150mph (check the vid in my sig).
By final-drive ratio, we are talking about 6th gear aren't we? Or have I grabbed the wrong end of the ballpark ?
By final-drive ratio, we are talking about 6th gear aren't we? Or have I grabbed the wrong end of the ballpark ?
I think what he's saying about 6th is that instead of it being a weak overdrive type gear it will now have some balls.
#28
Members
Thread Starter
Join Date: Mar 2009
Location: Chicago
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2006 550i sport package, manual, black on black w/ anthracite trim, pdc, logic 7, cold weather pkg.
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877443' date='May 13 2009, 03:33 PM
In 6th gear? Only between 150mph and 180mph, because 5th gear takes you all the way to around 150mph (check the vid in my sig).
By final-drive ratio, we are talking about 6th gear aren't we? Or have I grabbed the wrong end of the ballpark ?
By final-drive ratio, we are talking about 6th gear aren't we? Or have I grabbed the wrong end of the ballpark ?
#29
#30
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by DD_545i' post='877525' date='May 13 2009, 05:42 PM
Oh, so I have misunderstood what's meant by final drive ratio then. If all gears are affected then it makes total sense to do it for performance reasons. I was thinking final drive was referring to top gear ratio only. You can see how that would make no sense.
Now we're talking. A friend and I did that on a crappy Ford Escort back in the 80s when we were teenagers.
Simple terminology misunderstanding. I would have got "changing the diff ratio" right away
![Laughing](https://5series.net/forums/images/smilies/imported/laughing.gif)
Now we're talking. A friend and I did that on a crappy Ford Escort back in the 80s when we were teenagers.
Simple terminology misunderstanding. I would have got "changing the diff ratio" right away
![Laughing](https://5series.net/forums/images/smilies/imported/laughing.gif)
![Big Grin](https://5series.net/forums/images/smilies/imported/biggrin.gif)
![Laughing](https://5series.net/forums/images/smilies/imported/laughing.gif)