325i cab diff question

[Taz]

hello: guys

been lookin for a lsd for my cab......dont know much about them!.....which ones r better higher ratio numbers or lower? eg 3.** or 4.**?.....been lookin on ebay......also wat should i pay for 1?


thanx

[Taz]

hi:

so none of u knows anything about them either??

[Zayyan]

In terms of what's better it depends on what you want it for.

The following is by user "essbee":

A "low ratio" diff (4.27:1 for example) gives good acceleration but lower top speed. This is because the engine is revving faster for any given road speed. A 4.27 with 205/55x15 tyres will be doing roughly 4000rpm at 80mph in 5th gear.

A "high ratio" diff (3.64:1 for example) won't give as good acceleration, but the top speed will be higher, assuming that the engine is powerful enough to overcome the aerodynamic drag at higher speeds. It will give better economy overall because the engine is revving lower for any given road speed. A 3.64 with 205/55x15 tyres will be doing roughly 3300rpm at 80mph in 5th.

However, if you are mostly in town, any gains from the higher ratio diff may not be as good, because where you're now using 4th gear, you may well find that you're having to use 3rd.

[Taz]

cheers mate

i want one to do some ameteur drifting and doughnuts!

[Brianmoooore]

hi:

so none of u knows anything about them either??

Some of us do sleep occasionaly!!