Sport revs it guts out on motorway......

[OllieB]

My car is a tec 2 Sport, and one of the things that annoys me the most about it is the fact that it revs so high on the motorway. I presume I have a 3.91 diff and combined with the sport box (Where 5th is the same as fourth on a normal 325i box) it seems to rev its tits off at anything over the legal limit. Luckily I hardly do any miles in it, but does this annoy anyone else? Rant over, phew, feel better already.

[Simon13]

Nope i think it's fine, fit a 3.64lsd then. But i feel it takes the edge of acceleration for the gain of a more relaxed cruise on the m-way

3.91 70 in 5th= 3k RPM
3.64 70 in 5th= 2.5RPM

is it really worth it!

[Gouki]

Nope i think it's fine, fit a 3.64lsd then. But i feel it takes the edge of acceleration for the gain of a more relaxed cruise on the m-way

3.91 70 in 5th= 3k RPM
3.64 70 in 5th= 2.5RPM

is it really worth it!

thats good piece of info least i know what which one i have on mine now.

[Simon13]

and with a 3.73 in 5th is 2.75k RPM!

I'm pretty sure it's the same with auto's too

as my 325se auto has a 3.64lsd in it

[Widge]

I think you'll find on rhe sport box it's only 1-2-3 that are different ratios to the normal box. 4th and 5th are the same ratio, particularly 5th which is just a 1:1 ratio.

I think, I'm 99% sure, although now I have said that I'll be wront!

[Simon13]

Ollie said what u just said!

nope 5th is an over drive gear, i don't think 4th is direct either.

Only dog leg boxes have direct 1:1 on 5th

[Gouki]

and with a 3.73 in 5th is 2.75k RPM!

I'm pretty sure it's the same with auto's too

as my 325se auto has a 3.64lsd in it

blimey there's more! I better check that, sure mine is a 3.91, wait till i get my car back from the garage.

[M5pilot]

4th gear on a sport box is the same as a normal box = 1:1

5th gear is 0.81:1

If your doing alot of motorway driving get a longer diff as Simon says.

3.64 LSD is very good, it does slightly take the edge off the acceleration but not by alot.

[OllieB]

I'm pretty sure my haynes manual lists fifth gear as straight through for the sport box, same as fourth in the normal box. Please correct me if I am wrong though.

[OllieB]

Thing is I don't do hardly any driving in the thing so I don't know why I'm whingeing in the first place. Just a grumpy fucker today. I can't recall what it does at 70mph but I know it revs at exactly 4k when I'm doing an indicated 90mph.

[M5pilot]

Sport box has 0.81:1 5th gear - look in your manual.

90mph and 4000rpm is defo 3.91 ratio.

[Simon13]

haynes manuals are full of shit period.

To me if u hardly drive the sport and even less on the m-way why are u moaning about it?!

If u hardly drive it surely u want it to be a quick blast machine, not some bogged down m-way cruiser!

I've never noticed the problem really that people moan about. It might have something to do with your scorpion exhaust which is probably making a hell of a racket 70mph making it seem worse. just my 2p on this

[Chaos]

I'm pretty sure my haynes manual lists fifth gear as straight through for the sport box, same as fourth in the normal box. Please correct me if I am wrong though.

im fairly sure its just 1 - 3 that are different.