sport gearbox

Post Tue Jun 20, 2006 2:03 pm

is there a big difference between a 325 sport gearbox and a normal 325 gear box ........ when your drving

Post Tue Jun 20, 2006 2:18 pm

hi

yes you will go up through the gears quicker with the sport box as the ratio is closer to give you better acceleration.

wullie

Post Tue Jun 20, 2006 5:12 pm

If you just change a sport 'box into a standard 325i, you'll probably end up with slower acceleration as the first 3 ratios are longer in the sport box.

This is what I've got and although it does mean I can do over 60 in 2nd, it also reduces the punch of 3rd gear, despite the turbos!

I believe that sports had a shorter diff ratio which made up for the acceleration deficiency, but gave less relaxed cruising.

Personally, I like longer low gears as it means (to me anyway) you can use more of the available ratios, 2nd gear with a non-sport box is all but useless once you're moving quickly IMO.

Post Tue Jun 20, 2006 5:46 pm

Turbo-Brown wrote:Personally, I like longer low gears as it means (to me anyway) you can use more of the available ratios, 2nd gear with a non-sport box is all but useless once you're moving quickly IMO.

.......

Post Sat Jul 22, 2006 7:35 pm

What diff ratios are good for Sport 'boxes?

Post Sat Jul 22, 2006 8:00 pm

i personally love the 3.64 25% lsd from a early mtech 1 325i sport

or you could be greedy and have a nice hartge 40% 2.97 LSD now thats a nice diff...

ive got 1 lol[/list]

Post Sat Jul 22, 2006 8:02 pm

Isn't there a big difference between a 2.97 and a 3.64 diff? That's a huge leap in ratios.

I was thinking that a 3.25 would be optimal - a good all-around ratio. What d'you think?

Post Sat Jul 22, 2006 8:10 pm

3.25 will be useless

Post Sat Jul 22, 2006 8:16 pm

LowLevel wrote:Isn't there a big difference between a 2.97 and a 3.64 diff? That's a huge leap in ratios.

Yeah, it's big jump in ratio's but my guess Ian's using a dog leg box with diferant ratios with the 2.97 in his Hartge H35 and a normal box(differant car ?) with the 3.64 ?

I was thinking that a 3.25 would be optimal - a good all-around ratio. What d'you think?

You want a dif between 3.64 and 3.91 for a 325, a 3.25 is way to tall

Post Sat Jul 22, 2006 8:19 pm

The Sport 'box I'm getting is coming from a 1990 325i Sport.

The part number I've been given is --- 260.0.1346.91

I'm assuming this is a non-dogleg 'box?

Post Sat Jul 22, 2006 8:22 pm

LowLevel wrote:The Sport 'box I'm getting is coming from a 1990 325i Sport.

The part number I've been given is --- 260.0.1346.91

I'm assuming this is a non-dogleg 'box?

Yeah, it won't be a dog leg box

Post Sat Jul 22, 2006 8:25 pm

Andy335Touring wrote:
LowLevel wrote:The Sport 'box I'm getting is coming from a 1990 325i Sport.

The part number I've been given is --- 260.0.1346.91

I'm assuming this is a non-dogleg 'box?
Yeah, it won't be a dog leg box

Are these ratios correct for the Sport box?

3.72 - 1st
2.40
1.77
1.26
1.00 - 5th

I know these are the Standard ratios:

3.83 - 1st
2.20
1.40
1.00
0.81 - 5th

Post Sat Jul 22, 2006 8:29 pm

As in the other thread

Post Sat Jul 22, 2006 9:24 pm

Andy335Touring wrote:As in the other thread

Font of knowledge

Nice one !!

Post Sun Jul 23, 2006 1:01 am

LowLevel wrote:The Sport 'box I'm getting is coming from a 1990 325i Sport.

The part number I've been given is --- 260.0.1346.91

I'm assuming this is a non-dogleg 'box?

if your getting a 1990 sports box u probably will want a 3.91 lsd that will mate nicely to it same car that would be from then if you get me

for my hartge h35 it uses a m3 e30 dogleg box with uprated layshaft bearings seals etc, with the 2.97 40% LSD hartge.

my 325i sport mtech 1 uses a 3.64 lsd 25% lock and is mated to the sports gearbox from the same car.

hope that may help a bit but personally out of the 25% lsds i prefer the 3.64 but thats just me however if u were running big power etc id be wanting a diff built upto a 40% ratio if u ever need any help with diffs and gearboxes i know a very very good guy for this up in northampton.

just my 2p thanks ian.

Post Sun Jul 23, 2006 2:55 pm

love the way you get to go faster backwards too if you've got the Sport 'box

Post Sun Jul 23, 2006 9:55 pm

turbo brown, in a sport u cannot do 60 in 2nd because they have 3.91 diffs

they only made the sport box to lose the powerband hole u were dropped in with a normal box. from 2nd to 3rd

the best combo imo is sport box and a 3.73

but i expect your turbo is a 3.64? which gives nice long legs, compared to a sport setup!