View Full Version : Hi guys need help Diff. swap

Mohamed 525i
03-30-2005, 05:13 AM
Hello guys

I want to get the differential gear ratio changed ,,
the car is E34 540 with 2.93 and the suggested one is 3.25

so if I changed it to the higher one which is 4.10 how I'll deal with it ?

now the car can go for 250 Km/h if I changed it to the 4.10 what is the milage loss will be ??

and will it be justified by the drastic increase in acceleration ??

thanx guys


03-30-2005, 01:04 PM
IMO going from a 2.93 to a 4.10 is way to much. I went from a 2.93 to a 3.25 and it was perfect, it revs a little higher than I would like on the highway, but that is probably because I was so used to the 2.93.

If you go to a 4.10 from a 2.93, that works out to a 39% increase in engine speed at any given RPM, which is a lot.

So say you are at 3000rpm with the 2.93, you will now run at 4170rpm with the 4.10, so its up to you whether you want to run that high.

Mohamed 525i
03-31-2005, 03:53 AM
I see,, so better to change it to one step higher ,,,

thanx alot I appreciate ur replay