325i at 4500revs what speed??

[dazleeds]

as above what speed should aa standard 325i achieve at 4500revs?? oh in 4th gear


had a play today and i got to 118/119 on guage in my car

but she not standard so just wonderung how this compares

[Turbo-Brown]

Mine did 112mph (in 4th I think) on the rollers at 6250rpm!

You must have a looooooooong diff ratio if you're doing those kinds of speeds at 4500rpm!

Either that or my power runs were done in 3rd which might make sense as 4850rpm is about 70mph in 3rd thinking about it.

[bmwe30mtech]

Gotta get me a 325i That sounds fast to me Daz, but what do i know about 6 pots!

[dazleeds]

ya see thats whats confusing me

my diff is fooked makes loads of noise
more than any ive had before
and i was told it only has a standard diff too

has headwork etc/cam/zorst/6branch
but as you say its down to the diff

and ur the second to say same tnight

damn betty shifts

guess i need to investigate the diff

cnt see the tag being readable can you

[jonbuoy]

I've just changed the engine in mine Daz to a 2.5 from a 1.8 M40.

Late 2.5 engine
2.0l manual gearbox
3.25 LSD

And mine does 120mph at 6000rpm in 4th

If you can't read the tag, as i could'nt, the only other way i know is to disconnect the prop and half shaft's, mark the output shaft, turn the input shaft one revolution and count how many time's the output shaft turn's.

Mine turned 3 1/4 turn's so that tell's me it's a 3.25 and you can feel it is as it take's a little longer to get to where you are going but the speed's you get are fantastic

[E30BeemerLad]

err summit ain't right there dazzle.

It's November since I drove that car, but i'm sure at 80 for example in 5th it was pulling 3.5K-4K revs

you sure it was in 4th?

for the knowledge i have of that car, which started life as a boggo spec 325 with keep fit windows, i have known the car for 6 years now and no diff swapping in that time, it certainly ain't a slipper either and it is pretty crusty looking and i was never able to see what numbers were stamped on it.

with that gearing/ revs you were pulling in 4th, then it must be capable of inter-galactic speeds in top

PS, i'll give you £500 for the car

[dazleeds]

mate im baffled bigtime

mrs has just reconfirmed i havent made a mistake with the readings etc

well im gonna have to go for a drive and do it again i guess

will try remember to take cam with me

[Steviec]

The speed you mention though is just the speedo reading, this could easily be way out at high speeds.

To check the speed you need to borrow a gps devise like a road angle that shows your accurate speed.

[dazleeds]

The speed you mention though is just the speedo reading, this could easily be way out at high speeds.

To check the speed you need to borrow a gps devise like a road angle that shows your accurate speed.

hmmm

anyone coming to ferrybtidge that has one

[12345kevin]

Are you sure it's got the right coding plug in the Dash. Would the revs read only 2/3 value if a 4 pot plug was in there ?

[Simon13]

Daz early sport? 3.64 mate

m-tech 2 sports 3.91
facelift auto - 3.64
tourings - 3.91
saloons facelift - 3.73
chrome saloon - ???
motorsport cab - 3.91
normal cabs i don't know!

3.91 screems on the m-way 3000rpm in 5th, top speed 135mph.
All about acceleration with these, i like them, some don't not too good economy diff!

3.73 more sedate 2750rpm in 5th, top speed 145mph ish
does a good job of everything. LSD's very rare in this ratio!

3.64 2500rpm in 5th, good for over 150 mph so i'm told
Nice cruising diff, bit of loss through the gears but not bad enough to piss u off imo. Very good m-way economy 30 plus

all these speeds are the same if u have an auto 2.5 aswell

HTH

[johnl320]

I've just changed the engine in mine Daz to a 2.5 from a 1.8 M40.

Late 2.5 engine
2.0l manual gearbox
3.25 LSD

And mine does 120mph at 6000rpm in 4th

If you can't read the tag, as i could'nt, the only other way i know is to disconnect the prop and half shaft's, mark the output shaft, turn the input shaft one revolution and count how many time's the output shaft turn's.

Mine turned 3 1/4 turn's so that tell's me it's a 3.25 and you can feel it is as it take's a little longer to get to where you are going but the speed's you get are fantastic

Why disconnect everything? Some tipex marks in the right places and jack it up, make sure the wheels turn at the same speed, probably better turnin the prop more than once then do the maths to get a more accurate reading cos thers not a lot of difference between those ratios when the props turned by hand if you know what I mean.