[WilcoJunoHotel]

Has anyone changed the factory springs and ride height specifically to improve the handling of the M240i? If so, was it worth it?

I am mulling over the idea of trading mine for an M2 but to be honest, the M2 is a bit overkill for my needs (would never use all that extra power and track oriented suspension). Just looking to bump up the handling of mine a bit - mostly less body roll in the twisties. Mine is RWD so I can also put bigger tires on which helps with the grip but not so much with the body roll. It is almost as if it needs another sport mode above Sport Plus for me.

This is the same issue that I had with my Genesis G70 and I guess it is just a trade off for a softer ride for these cars. The M240i is better than the G70 but still not where I would like it to be.

IDK, maybe the M2 is the better car for me but I don't have one to drive in the twisties to test so not sure how much better it would be, if any, for those types of road.

[Pentland]

You don’t change springs to reduce body roll, you increase roll bar resistance.
However, set of Eibach or AC schnitzer springs will achieve a more focused ride.

[T.R.S.]

Originally Posted by Pentland

You don’t change springs to reduce body roll, you increase roll bar resistance.
However, set of Eibach or AC schnitzer springs will achieve a more focused ride.

Could you please expound on "more focused ride"?

[XHILR8]

I did the Dinan springs and Dinan rear toe link for my 2024 xdrive and it made a world of difference. It reduced body roll, gave better turn in, better launch with reduced drivetrain loss and very stable at higher speeds. I did the 10mm spacers all around and have thought about the new Dinan sway bars offered but that is not a do it yourself job in my opinion. Not as easy as changing sway bars in my Jeep or Mustang.

I also debated the M2 but went this route. I will be purchasing the 2026-2027 M2 in AWD though.

[Troy1972]

In my opinion springs dont do nothing for handling or bodyroll, its pure optical. I put Eibach springs on mine and the ride was still $hit.

After changing to Bilstein coilovers it became a complete different car. Night and day difference.

[WilcoJunoHotel]

Originally Posted by XHILR8

... sway bars offered but that is not a do it yourself job in my opinion. Not as easy as changing sway bars in my Jeep or Mustang.

Yeah, that job doesn't appear to be something I want to do or even pay someone to do. A few years ago I had a Can Am Spyder (3 wheeler) and a bigger front sway bar (and stiffer bushings) made a huge difference in straight line stability and cornering. Steering feel was improved dramatically too. But it was an easy DIY job.

I need to go drive an M2 before doing anything to my M240i though - just hard to get a dealer to let me go play in the twisties with their
(very limited) inventory.

[EMZWEI]

Originally Posted by WilcoJunoHotel

Yeah, that job doesn't appear to be something I want to do or even pay someone to do. A few years ago I had a Can Am Spyder (3 wheeler) and a bigger front sway bar (and stiffer bushings) made a huge difference in straight line stability and cornering. Steering feel was improved dramatically too. But it was an easy DIY job.

I need to go drive an M2 before doing anything to my M240i though - just hard to get a dealer to let me go play in the twisties with their
(very limited) inventory.

Yea, you’re going to want the M2 afterwards.

[XHILR8]

Originally Posted by Troy1972

In my opinion springs dont do nothing for handling or bodyroll, its pure optical. I put Eibach springs on mine and the ride was still $hit.

After changing to Bilstein coilovers it became a complete different car. Night and day difference.

That's crazy because its scientifically and track proven that lowering a cars center of gravity with the correct spring and rate with a paired shock/strut, stock or aftermarket or coilover setup reduces body roll, improves cornering, increases stability and gives better responsiveness. It also benefits weight transfer with less drivetrain loss on launch and hard braking. Sway bars are even better to complete the package along with bushings, lower arms, toe links etc. but at a way stiffer ride for a daily driver. But the key is to keep it in perfect suspension geometry and alignment or it will ride like crap. But you certainly cant beat a coilover setup for handling.

My xdrive had no coil over options so went with the springs from Dinan. Its a blast to drive now over stock suspension and power.

[kudos]

Originally Posted by XHILR8

That's crazy because its scientifically and track proven that lowering a cars center of gravity with the correct spring and rate with a paired shock/strut, stock or aftermarket or coilover setup reduces body roll, improves cornering, increases stability and gives better responsiveness. It also benefits weight transfer with less drivetrain loss on launch and hard braking. Sway bars are even better to complete the package along with bushings, lower arms, toe links etc. but at a way stiffer ride for a daily driver. But the key is to keep it in perfect suspension geometry and alignment or it will ride like crap.

My xdrive had no coil over options so went with the springs from Dinan. Its a blast to drive now over stock suspension and power.

Don't believe everyone on the internet.

[XHILR8]

Originally Posted by kudos

Don't believe everyone on the internet.

I was trying not to be a *ick. lol

[Troy1972]

Originally Posted by XHILR8

That's crazy because its scientifically and track proven that lowering a cars center of gravity with the correct spring and rate with a paired shock/strut, stock or aftermarket or coilover setup reduces body roll, improves cornering, increases stability and gives better responsiveness. It also benefits weight transfer with less drivetrain loss on launch and hard braking. Sway bars are even better to complete the package along with bushings, lower arms, toe links etc. but at a way stiffer ride for a daily driver. But the key is to keep it in perfect suspension geometry and alignment or it will ride like crap. But you certainly cant beat a coilover setup for handling.

My xdrive had no coil over options so went with the springs from Dinan. Its a blast to drive now over stock suspension and power.

No coilover options? I have an xdrive too and have the Bilstein Evo SE but you can go with KW or even Ohlins on your xdrive.

[M_Chronos]

Originally Posted by Troy1972

In my opinion springs dont do nothing for handling or bodyroll, its pure optical. I put Eibach springs on mine and the ride was still $hit.

After changing to Bilstein coilovers it became a complete different car. Night and day difference.

Springs absolutely impact weight transfer which is associated with body roll. Antiroll bars, which are also springs, impact this as well.

Best way to think about this, the car sits on the springs, it rides on the dampers (shocks). The springs are what keeps the car off the ground and are there to absorb impacts. By changing only the springs you are changing what the dampers were designed around and this will impact ride quality. If you make a damper cope with a higher rate spring the ride for sure will get way more "busy" as it can't control rebound as well.

Also, and this is not one-to-one, but what you change in the direction of performance will often have a detrimental affect on ride quality. Antiroll bars are an easy example. Higher rate bars are an excellent way to tune cornering characteristic but are not so great for your head getting tossed around as the car rides over uneven road surfaces.