lsd question

[corkie]

will a 391 slipper make any difffrence top end or low end as opposed to my standard open diff,tia

[georgen]

Totally depends on what you're driving old chap...

[B7]

will a 391 slipper make any difffrence top end or low end as opposed to my standard open diff,tia

Need to know what your running now to tell you

[N00b]

will a 391 slipper make any difffrence top end or low end as opposed to my standard open diff,tia

The only thing that will make a difference to your acceleration or top speed is the ratio, matey. Whether it's an LSD or an open diff makes absolutely no difference.

[corkie]

sory my car is a 325 cab,the diff currently fitted is unknown(tag unreadable) ,all i know is its a open diff,so im fitting a 391 slipper,just wonderd ,i dont realy understand diffs,that is apart from how the lsd works

[SPADGE]

Hi mate

Nice to meet you this morning.

Your current diff will almost certainly be a 3.64 so the 3.91 will make your car a little quicker when it comes to acceleration and rev slightly higher when in top gear on the motorway.

Have fun putting it in.

Jules...

[N00b]

sory my car is a 325 cab,the diff currently fitted is unknown(tag unreadable) ,all i know is its a open diff,so im fitting a 391 slipper,just wonderd ,i dont realy understand diffs,that is apart from how the lsd works

Basically, the higher the number the lower your gearing.
For greater acceleration and, as a by product, a lower top speed or higher revs at the same top speed.....choose a lower gearing ie a larger number.
For slower than standard acceleration and a higher top speed (or lower revs at the existing maximum, choose a higher gearing ie a lower number.

[corkie]

Hi mate

Nice to meet you this morning.

Your current diff will almost certainly be a 3.64 so the 3.91 will make your car a little quicker when it comes to acceleration and rev slightly higher when in top gear on the motorway.

Have fun putting it in.

Jules...

lol,how was the golf

[SPADGE]

Hi mate

Nice to meet you this morning.

Your current diff will almost certainly be a 3.64 so the 3.91 will make your car a little quicker when it comes to acceleration and rev slightly higher when in top gear on the motorway.

Have fun putting it in.

Jules...

lol,how was the golf

Please don't mention the golf

[B7]

Hi mate

Nice to meet you this morning.

Your current diff will almost certainly be a 3.64 so the 3.91 will make your car a little quicker when it comes to acceleration and rev slightly higher when in top gear on the motorway.

Have fun putting it in.

Jules...

Not sure your right on this one Jules . Every convertible 325i I've seen has had a 3:73 in it. Inc. that white cab Barry broke had a '73 LSD in it, mine had a '73 open and another couple I've seen had '73's. It was to give the heavier car the similar performance to the lighter 2 doors (which had '64's IIRC)

Moving from a '73 (or a '64 for that matter) to a '91 will as jules says give you more sprightly performance (which is why the sports came with them) but you will see less MPG overall as it's revving higher.

[corkie]

Hi mate

Nice to meet you this morning.

Your current diff will almost certainly be a 3.64 so the 3.91 will make your car a little quicker when it comes to acceleration and rev slightly higher when in top gear on the motorway.

Have fun putting it in.

Jules...

Not sure your right on this one Jules . Every convertible 325i I've seen has had a 3:73 in it. Inc. that white cab Barry broke had a '73 LSD in it, mine had a '73 open and another couple I've seen had '73's. It was to give the heavier car the similar performance to the lighter 2 doors (which had '64's IIRC)

Moving from a '73 (or a '64 for that matter) to a '91 will as jules says give you more sprightly performance (which is why the sports came with them) but you will see less MPG overall as it's revving higher.

i have heard this before,a couple of people suggested it is a 373open diff and thats what i presumed it to be
thanks for the info,
just need to fit now

[cliffybabe]

my cab had a 373 open diff, It now has a 3.91 slipper

[corkie]

how does it compare to the 3:73 cliffe..?

[E30BeemerLad]

I've just fitted a 391 slipper to my touring and do find it a bit revvy on motorways. At 70 it is doing 3k

[cliffybabe]

how does it compare to the 3:73 cliffe..?

well it was going back a few years and it does feel more lively at the higher range

[croqy]

got a 4;4 75% lock one in my sport no good for motorways really but great fun and through the gears in no time, though the combination of sport box and this diff makes it pull well in all gears, good luck
www.lotusport.co.uk
regards Anton