E30 Zone

whats the best LSD to use on an m20 with sport box? 3.91 is what the sports came with am i correct, and how would a 3.73 compare

anyone?

Either would be fine,you wouldn't notice much differance between those ratios.

cheers matey.

you WILL notice a difference, ive tried both in my 2.7 and with the 3.73, the car lost shove in 3rd..... sport diff is better, however if ure doing mway miles..... then id go for the 3.7 everytime sport diff shows 4250rpm at 100mph which is too high, as at about the same rpn in 5th with the 3.73 diff u r doing a cool 120mph......

so am i right in saying the 3.73 gives a better top end, and sport better low down.

yes.

diff, like tyre size changes the final drive ratio of the car.

I installed a 3.73 LSD yesterday. When cornering with 215/40-17 tyres the tail sticks in second if you don't hit the clutch. Of course, the bhp is still 170, so I wasn't expecting anything drastic. However, corners are much faster with loads of grip, especially with the convertible whose chassis is not as stiff. Donuts are VERY easy, will be contacting the local tyre dealer in a short while . Compared to my old 3.91 open diff, there is a slight difference in smoothness, revs and mileage.

Gromit wrote:I installed a 3.73 LSD yesterday. When cornering with 215/40-17 tyres the tail sticks in second if you don't hit the clutch. Of course, the bhp is still 170, so I wasn't expecting anything drastic. However, corners are much faster with loads of grip, especially with the convertible whose chassis is not as stiff. Donuts are VERY easy, will be contacting the local tyre dealer in a short while . Compared to my old 3.91 open diff, there is a slight difference in smoothness, revs and mileage.

Sounds very promising and just what I want.... have you done any comparison on Motorway cruising? how much did the revs drop when driving at 70 mph for example?

nav786 wrote:so am i right in saying the 3.73 gives a better top end, and sport better low down.

yes thats right BUT find a 3.73 LSD u won't! u can get 3.91 or 3.64 LSD's abit easier. I would stick with the 3.91 better acceleration and they are not that bad on the m-way. No worse than your 318 is now i expect

3k @ 70mph for a 3.91

Simon13 wrote:

nav786 wrote:so am i right in saying the 3.73 gives a better top end, and sport better low down.

I would stick with the 3.91 better acceleration and they are not that bad on the m-way. No worse than your 318 is now i expect

3k @ 70mph for a 3.91

yeh, i dont really do much motorway miles so 3.91 is the way i will go i think. prefer low down grunt.

yeh if u dont do much mway id go 3.91, having had both.... i am doing lots of mway miles now so i may get a 3.73 if i can get one......

u got pm karan

i have indeed....i have been in touch with the fella! cheers again

no probs mate. seems a bargain.

bebecar wrote:

Gromit wrote:I installed a 3.73 LSD yesterday. When cornering with 215/40-17 tyres the tail sticks in second if you don't hit the clutch. Of course, the bhp is still 170, so I wasn't expecting anything drastic. However, corners are much faster with loads of grip, especially with the convertible whose chassis is not as stiff. Donuts are VERY easy, will be contacting the local tyre dealer in a short while . Compared to my old 3.91 open diff, there is a slight difference in smoothness, revs and mileage.

Sounds very promising and just what I want.... have you done any comparison on Motorway cruising? how much did the revs drop when driving at 70 mph for example?

download oskardԚ´s excel file, you can play with it to get the info you need based on your car ;)

Gunni wrote:

bebecar wrote:

Gromit wrote:I installed a 3.73 LSD yesterday. When cornering with 215/40-17 tyres the tail sticks in second if you don't hit the clutch. Of course, the bhp is still 170, so I wasn't expecting anything drastic. However, corners are much faster with loads of grip, especially with the convertible whose chassis is not as stiff. Donuts are VERY easy, will be contacting the local tyre dealer in a short while . Compared to my old 3.91 open diff, there is a slight difference in smoothness, revs and mileage.

Sounds very promising and just what I want.... have you done any comparison on Motorway cruising? how much did the revs drop when driving at 70 mph for example?

download oskardԚ´s excel file, you can play with it to get the info you need based on your car ;)

where does one acquire this excel file?! do you have a link?

thanks

Or try this gearing calculator

http://www.unixnerd.demon.co.uk/revs.html