Post your 40-70mph acceleration

[02stu]

I think this is an easy way to answer all of those "is the s50 worth it" questions. Acceleration from 40-70mph does not involve any driving skill and traction doesn't come into play. So, time how long it takes you to accelerate from 40mph to 70mph in third gear and post your times along with your modifications. Use a stop watch or your OBC, don't just count.

3rd gear 40-70mph
BMW e30 m52 OBD1 non vanos 5.10 seconds
2000 Porsche Boxster (16" wheels, m/t) 6.32 seconds
Audi s4 5.31 seconds

[02stu]

weak, come on post some times

[RVA e30]

ill try to later this week

[bimerok]

Soon to test.

[Mike325]

People with M50 engines chime in too. You should also post your diff ratio.

[sticksdaman]

so is this for 24 valvers only?

maybe we can post up the times for m10, m42 and m20 powered cars so as to get a better understanding of the difference.

[mattdk318i]

so is this for 24 valvers only?

maybe we can post up the times for m10, m42 and m20 powered cars so as to get a better understanding of the difference.

Im liking the sound of this thread. Im in the process of my M50 swap.

[mazur]

Let you guys know by tommorrow. I'm guessing <2 seconds ;)

[mazur]

What a dissappointment....3.79 seconds.

:p


Details of car:

S50 w/ ZF tranny and 3.73 diff.
Ebay headers
2.5'' single exhaust
Stickley chip
3.5'' HFM
24# inj.
10# JB racing flywheel

Approx. weight when timed: 2750#

[02stu]

so is this for 24 valvers only?

maybe we can post up the times for m10, m42 and m20 powered cars so as to get a better understanding of the difference.

Definitely, lets get as many times as we can. If you are able to get any times of other non BMWs that would be good to. The trick is finding 3rd gear pulls. In the end I would like to make an excel spread sheet and post it. Is it possible to post this same thread in multiple forums, as in the tech forum as well.

[JGood]

Rear end ratio is very important. As is which transmission was used in the m/s50 swap. A fifth gear pull comparison would be good as well, to show bottom end power.

This should be good info nonetheless...

[mazur]

Rear end ratio is very important. As is which transmission was used in the m/s50 swap. A fifth gear pull comparison would be good as well, to show bottom end power.

This should be good info nonetheless...

Eh...won't be fair because lots of cars are fast do to their top end. Bottom end won't help you much in a race usually.

For example: some older American V8's have peak torque extremely early and drop off steeply to redline.

[Stu]

Never timed 40-70, always did 50-80 in 3rd gear.

(50-80)
After the swap: ~4.1-4.2s
After chip/fuel pressure tuning: ~3.8-3.9s

With the M42: ~9.5s :D

[Good & Tight]

Turbo M10 40-70 shifting from 2nd to 3rd 3 sec. I should do a 3rd gear pull.

[JGood]

Eh...won't be fair because lots of cars are fast do to their top end. Bottom end won't help you much in a race usually.

For example: some older American V8's have peak torque extremely early and drop off steeply to redline.

But it's nice to know what type of torque is available down low. I wasn't saying only do 5th gear pulls, but it's nice additional info. Not listing diff ratio and specific tranny further reinforces your point about not being in the powerband (like the high end power cars vs. muscle cars in low end pulls)... The more data the better is my point. It would be awesome to see some charts with each engine type, ratio, etc...