[Mr. 340]

Greetings,
I got a 340i with the M Sport suspension. So far I am planning on keeping my stock springs, changing out struts and will be doing an M Perfomance LSD next year and of course wheels and tires (downsizing from my 442m wheels to Apex 18" rims with some Hoosier or R888R tires)

What other mods are truly necessary and will make a big difference? Should I do poly bushings, sway bars, control arms, camber plates and all that other suspension mods people do? Thanks!

[jbiswurm]

Originally Posted by Alan340

Greetings,
I got a 340i with the M Sport suspension. So far I am planning on keeping my stock springs, changing out the shocks and struts and will be doing an M Perfomance LSD next year and of course wheels and tires (downsizing from my 442m wheels to Apex 18" rims with some Hoosier or R888R tires)

What other mods are truly necessary and will make a big difference? Should I do poly bushings, sway bars, control arms, camber plates and all that other suspension mods people do? Thanks!

I would say dont do poly subframe bushings. Either do delrin/solid or leave stock.

I have the bimmerworld delrin aluminum subframe bushings and turn delrin diff mounts. Absolutely love them to death but wow the solid diff mounts make things quite noisy!

I would also highly recommend f80 upper and low front control arms. That will really tighten up the front and give you much needed camber.

[Mr. 340]

Originally Posted by jbiswurm

I would say dont do poly subframe bushings. Either do delrin/solid or leave stock.

I have the bimmerworld delrin aluminum subframe bushings and turn delrin diff mounts. Absolutely love them to death but wow the solid diff mounts make things quite noisy!

I would also highly recommend f80 upper and low front control arms. That will really tighten up the front and give you much needed camber.

How loud is it? and what is the sound like? Clanking or creaking noises? I will still take a look at those options, been reading that someone with a 340i got the ones you got and didn't fit properly and he had to modify it. Did you have any issues?

[jbiswurm]

Originally Posted by Alan340

How loud is it? and what is the sound like? Clanking or creaking noises? I will still take a look at those options, been reading that someone with a 340i got the ones you got and didn't fit properly and he had to modify it. Did you have any issues?

I have a 335 - not sure if they run the sane diff mounts.

They do two things- they transmit a lot of gear whine from the diff as expected. They also seem to amplfy everything from road noise to transmission noise to exhaust. Its like all those noises vibrate the diff case and then get transmitted through the chassis.

I actually really like it, but i use the car for commuting mostly and am typically alone. It is loud loud loud for sure.

That said, they eliminate just about all of the driveline slack. Definitely a performance improvement!

[Mr. 340]

Originally Posted by jbiswurm

I have a 335 - not sure if they run the sane diff mounts.

They do two things- they transmit a lot of gear whine from the diff as expected. They also seem to amplfy everything from road noise to transmission noise to exhaust. Its like all those noises vibrate the diff case and then get transmitted through the chassis.

I actually really like it, but i use the car for commuting mostly and am typically alone. It is loud loud loud for sure.

That said, they eliminate just about all of the driveline slack. Definitely a performance improvement!

Perfect thank you for the feedback! Gonna start making my suspension list and see if I can get any good deals on black friday in a couple weeks!

[mholder]

I have a 340i Msport which came with the m sport suspension. I swapped this out for the m performance suspension, mperformance LSD, mperformance brakes, the mppsk kit and the Dinan CAI. I have much more power and acceleration from the mppsk and CAI but the real icing on the cake comes with the LSD. All the power upgrades are fine for straight line driving but the improved and precise handling that comes with the LSD beats all of the other mods and truely makes the car fun to drive. It even improves launch off the line because the LSD minimizes wheel spin and tail wagging that came with the increased power and torque from the mppsk.

[Mr. 340]

Originally Posted by mholder

I have a 340i Msport which came with the m sport suspension. I swapped this out for the m performance suspension, mperformance LSD, mperformance brakes, the mppsk kit and the Dinan CAI. I have much more power and acceleration from the mppsk and CAI but the real icing on the cake comes with the LSD. All the power upgrades are fine for straight line driving but the improved and precise handling that comes with the LSD beats all of the other mods and truely makes the car fun to drive. It even improves launch off the line because the LSD minimizes wheel spin and tail wagging that came with the increased power and torque from the mppsk.

Yeah I will definitely be doing the M Performance LSD next year. When changing out the diff I will take advantage and lower the subframe as well to change out the subframe bushings right away, along with the BMS diff brace and upgraded diff bushings. How do you like the M Performance suspension?

[zinner]

Camber plates and bushings. They will save the front tires from cording on the outter edge. M-LSD is a great bang for buck as well. Have fun out there!

[zinner]

Originally Posted by jbiswurm

I would also highly recommend f80 upper and low front control arms. That will really tighten up the front and give you much needed camber.

Whats the upper control arm? Are you talking about the rear upper control arm?

[jbiswurm]

Originally Posted by zinner

Whats the upper control arm? Are you talking about the rear upper control arm?

Front upper = tension strut = thrust arm

[brigade24]

+1 on the camber plates and bushings. I went with delrin rear subframe and differential bushings and it is very streetable.

the rear bushings changed my car completely...

[mholder]

Originally Posted by Alan340

Yeah I will definitely be doing the M Performance LSD next year. When changing out the diff I will take advantage and lower the subframe as well to change out the subframe bushings right away, along with the BMS diff brace and upgraded diff bushings. How do you like the M Performance suspension?

I thoroughly enjoy it.

[jbiswurm]

Originally Posted by brigade24

+1 on the camber plates and bushings. I went with delrin rear subframe and differential bushings and it is very streetable.

the rear bushings changed my car completely...

I also recently installed delrin rear subframe and diff bushings.

I find the rear subframe bushings (installed first) to really add no NVH. The delrin diff bushings however seems to add a significant amount of noise. Typically i would i tend to not be sensitive to NVH but its so loud that its hard to have a conversation in the car over the gear whine, driveline noise and road noise.

Is that not tour experience?

[jbiswurm]

Originally Posted by mholder

I thoroughly enjoy it.

I have the mperformance suspension as well. Its good for the street but a bit soft in my opinion. If youre looking for track duty i do not think it's a suitable solution.

[AllaVodka]

Originally Posted by mholder

I have a 340i Msport which came with the m sport suspension. I swapped this out for the m performance suspension, mperformance LSD, mperformance brakes, the mppsk kit and the Dinan CAI. I have much more power and acceleration from the mppsk and CAI but the real icing on the cake comes with the LSD. All the power upgrades are fine for straight line driving but the improved and precise handling that comes with the LSD beats all of the other mods and truely makes the car fun to drive. It even improves launch off the line because the LSD minimizes wheel spin and tail wagging that came with the increased power and torque from the mppsk.

Do you feel the LSD is a worthwhile upgrade for street only driving? I dont track the car, but would like more traction. I have zero interest in spending like $3K if the main benefit being able to kick out the rear / drift. I'm not too savy on the open diff vs LSD when it comes to everyday driving

Will the lsd only kick in if i lose traction on a turn? Ie. Have to be pushing the car suoer hard