M Factory 4.57 Final Drive

Reply Subscribe

Thread Tools

03-10-2013, 05:01 AM

#31

lovegroova

UK Moderator

Join Date: Jan 2004

Location: Herts

Posts: 24,762

Likes: 42

Received 307 Likes on 262 Posts

Quote:

Originally Posted by eSeM

What was the RPM, was that red lining it?

Rev limiter (my poor car), so not entirely sure, as I didn't have the OBD2 connected - I guess 8,900.

Reply Like

03-10-2013, 05:03 AM

#32

AquilaEagle

Administrator

Join Date: Jan 2002

Location: Heath & Reach, Beds, UK

Posts: 95,156

Likes: 139

Received 60 Likes on 51 Posts

Quote:

Originally Posted by lovegroova

Quote:

Originally Posted by eSeM' timestamp='1362855524' post='22391939

[quote name='S2K-Phil' timestamp='1359306886' post='22296107']
Does anybody have stats on what improvement to acceleration etc this would give? Does a 15% mean 0-60 improvement by 15% as this would equate to about a second off the quotes figures.

Going for a lower gear will actually make the 0-60 time slower.

On standard gears you can hit 60mph in 2nd gear but with the lower gear you will need an extra gear change as you wont hit 60mph till 3rd.

(However the 0-100kmh will be slightly quicker as you need 3rd gear to hit that on standard gearing)

Is that right? According to the gear calculator, standard gearing will get you 65.6mph in 2nd, which is 105km/h http://www.turnzero....gear_calculator

The links I posted above contain some useful graphs for acceleration with the different drives.

This is also very interesting reading (assuming the website the data was garnered from is correct) http://vlsicad.ucsd....i/perf_est.html (does not work in Chrome).

[/quote]

I've just used the same thing to get the 4.625 numbers, but it is spitting out completely different results - did you change anything from Stock apart from the final drive?

Reply Like

03-10-2013, 05:13 AM

#33

lovegroova

UK Moderator

Join Date: Jan 2004

Location: Herts

Posts: 24,762

Likes: 42

Received 307 Likes on 262 Posts

Quote:

Originally Posted by AquilaEagle

I've just used the same thing to get the 4.625 numbers, but it is spitting out completely different results - did you change anything from Stock apart from the final drive?

Did you remember to multiply the differential ratio to allow for the secondary shaft?
i.e
4.1 x 1.16 = 4.756
4.44 x 1.16 = 5.1504
4.57 x 1.16 = 5.3012
4.625 x 1.16 = 5.365

Here are my numbers:

Reply Like

03-10-2013, 05:16 AM

#34

AquilaEagle

Administrator

Join Date: Jan 2002

Location: Heath & Reach, Beds, UK

Posts: 95,156

Likes: 139

Received 60 Likes on 51 Posts

Quote:

Originally Posted by lovegroova

Quote:

Originally Posted by AquilaEagle' timestamp='1362920599' post='22393085

I've just used the same thing to get the 4.625 numbers, but it is spitting out completely different results - did you change anything from Stock apart from the final drive?

Did you remember to multiply the differential ratio to allow for the secondary shaft?
i.e
4.1 x 1.16 = 4.756
4.44 x 1.16 = 5.1504
4.57 x 1.16 = 5.3012
4.625 x 1.16 = 5.365

Here are my numbers:

Thanks Simon, I didn't remember, because I didn't know I had to, I just stuck the numbers in