Improving E90 318/320 pickup by changing rear diff?

[esis311]

Re: Improving E90 318/320 pickup by changing rear diff?

Quoted from E-90 Performance Motor Brochure, Final drive ratio stated for different model of E-90
316i (3.64)
318i (3.39)
320i (3.64)
325i (3.23)
330i (3.15)
335i (3.08)
The challenge would be the electronic sensor(should it exist) between model, and durability of the mehanical gear + bearing of modifying a 335i(3.08) to 320i(3.64) as the higher torque of the turbo engine produce more stress to the physical modified gear.
The extend of this modification could allow extreem wheel diameter upgrade to 21" due to larger outer wheel diameter compensation.

 

[detach8]

Re: Improving E90 318/320 pickup by changing rear diff?

318i lower final drive than 320i?!

 

[ac323]

Re: Improving E90 318/320 pickup by changing rear diff?

318i lower final drive than 320i?!

time to change to a 318i???










cheers

 

[detach8]

Re: Improving E90 318/320 pickup by changing rear diff?

1.6L 3 cycl F30 318i?

Just doesn't make sense for 318i to have shorter final drive.

 

[ed6141]

Re: Improving E90 318/320 pickup by changing rear diff?

1.6L 3 cycl F30 318i?

Just doesn't make sense for 318i to have shorter final drive.

Agree with you.

If both 320& 318 have the same N46 engine, strange that the ratio is different and against the trend if we plot the gear ratio from 335->316.

 

[detach8]

Re: Improving E90 318/320 pickup by changing rear diff?

Trickery to make the same engine seem more powerful? or trickery to make the 318i seem more fuel economical?

 

[wt_know]

Re: Improving E90 318/320 pickup by changing rear diff?

i suspect BMG AG purposely calibrate 318 pick up & low speed better for city drive.
if not, how to sell?
318 low speed > 320
320 high speed > 318

 

[detach8]

Re: Improving E90 318/320 pickup by changing rear diff?

I thought the taller gear ratio should be improving pickup vs top speed? in that case 320 pick up should be better...