m10 with 3.73

[Jean]

Does this sound about right or is my speedo wrong ?

2nd just about 60, 3rd 90, 4th went past 120ish...

on 195/60/14s.

[Mr Deagle]

your m10 pushed an e30 to 120?

[Jean]

Yeah, I don't get it I thought they couldn't get this fast ??

[bimmerdreamer]

120mph? Thats sounds like quite a bit in 4th. Ive taken my M10 to 128 and a ridin in a friends at 135, given a nice smooth stretch and no head wind.

[Jean]

What do you mean quite a bit in 4th ? Were you guys doing 128 in 5th ??

[///M Powered]

Damn, I couldn't get my 318 to 120 until I started going downhill.

[Febi Guibo]

I calculated the gearing speeds using this:

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

and used the ratios for a getrag 245 transmission, worked out to (at 6000rpm):

1st: 30
2nd: 56
3rd: 84
4th: 111
5th: 137

I think its a combination of BMW speedos being famously optimistic, slightly shorter tires, and a nice tailwind...

love your car btw!

[Jon325i]

Yeah, I don't get it I thought they couldn't get this fast ??

Tail wind? :-P

Jon

[Jean]

I calculated the gearing speeds using this:

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

and used the ratios for a getrag 245 transmission, worked out to (at 6000rpm):

1st: 30
2nd: 56
3rd: 84
4th: 111
5th: 137

I think its a combination of BMW speedos being famously optimistic, slightly shorter tires, and a nice tailwind...

love your car btw!

Cool, thank you! I was going to ask my bro to go side by side with me as hes got a digital tach in his car to see just how off the e30 speedo is lol.

[a3ternus]

Does this sound about right or is my speedo wrong ?

2nd just about 60, 3rd 90, 4th went past 120ish...

on 195/60/14s.

I drive a stock M10 and manage 120mph in fourth with a 3.64 diff!
I even posted this photo here more than once... :)
Its a four speed manual.4 and 5 speed were the same ratio wise.
I just dont have the overdrive fifth gear.4th is 1:1 in both!
N.

[kylebes1]

So the lil terd does better with a taller gear? Mine had a 3.91 and would only do 110. no matter what!

[a3ternus]

So the lil terd does better with a taller gear? Mine had a 3.91 and would only do 110. no matter what!

Forth gear's ratio is 1:1 and with a 3.64 this
equals to 120mph@7200rpm! :D
Now,with the 3.91 diff,top speed is 9mph less.:x
I wish I had fifth gear all the time though...
N.

[ecorrea21]

My 85's been 120 when she was younger:)

[mcgrath]

I managed to get my 85 318 to 118mph down hill with a 3.91. I was running a mikuni 44PHH at the time. The sound was amazing. Those days are long gone now.

[Hick]

I did a 3.73 in the M10 last winter. It worked fine, hardly noticed since they came with 3.91's as is. But i wouldnt go any lower, may work but any diff lower than a 3.73 is pricey until you find 2.93's and thats just way too low