Official Differential Output Thread

[transatlantic0207]

I am sorry if there is a thread already but I searched and I didn't find it

I can care less which car came stock with which differential...what I want to know is what speed & rpm's you're currently running; with which differential and which model it is obviously (e/vert/ix/is & i). Please specify LSD or not

I am running 1987 325is 4.10 LSD M20B25


i'll update this original post with numbers as I get them please do the same to avoid cluttering up


10mph
20mph
30mph
40mph
50mph
60mph=3.5k rpm
70mph
80mph
90mph
100mph
110mph
120mph

[jlevie]

There are gearing calculators available. The one I have is a spread sheet from that I got from diffsonline.com. For your car assuming standard sized tires fifth gear speeds would be:

1000rpm - 20mph
1500rpm - 31mph
2000rpm - 41mph
2500rpm - 51mph
3000rpm - 61mph
3500rpm - 71mph
4000rpm - 82mph
4500rpm - 92mph
5000rpm - 102mph
5500rpm - 112mph
6000rpm - 123mph

[stevehecht]

assuming standard sized tires fifth gear speeds would be

I've got +1 wheels on my 325i...how would that affect these stock readings?
Interesting thread...I'll get my readings in ASAP.

[lennon]

why? google "gearing calculator" or "rpm calculator" or something and find 10 sites to do this. they will have boxes to fill in with all the variables. no need for a thread about this.

[transatlantic0207]

you're a little late jlevie already provided a link and readings it's settled
find another thread to troll on

[lennon]

you're a little late jlevie already provided a link and readings it's settled
find another thread to troll on

troll? fuck you, yours is the useless post. he asked "how would my +1 inch wheels affect things?" so i responded. though its the outside tire diameter that matters, not wheel, as im sure you know.

[transatlantic0207]

;) touche

[nando]

http://www.f-body.org/gears/