Hate body roll - what springs to make it go away?

[DuSh]

Compared to stock that is (I realize it won't go away completely).
I have stock suspension on my 50i, no air or self-leveling, nothing like that.

I don't want H&R - because it makes car too stiff and bouncy jarry ride - a Pogo stick.

ACS or Eibach - seems only alternative. Which one will make body roll less while keeping ride close to stock? I don't care for lowering. I care for reducing body roll

[Violator]

Originally Posted by DuSh

Compared to stock that is (I realize it won't go away completely).
I have stock suspension on my 50i, no air or self-leveling, nothing like that.

I don't want H&R - because it makes car too stiff and bouncy jarry ride - a Pogo stick.

ACS or Eibach - seems only alternative. Which one will make body roll less while keeping ride close to stock? I don't care for lowering. I care for reducing body roll

I was in a similar situation as you and I went with the Eibach springs. On my daily commute, my drive includes many curvy roads where the speed limit is 60 mph, so I generally drive them at 60 mph - 70 mph. The Eibach springs seemed to have reduced the amount of body roll and improved the overall handling while only lowering it by an inch or so. I wasn't looking to slam the vehicle or change the stock ride, I'm very happy with the Eibach springs with the addition of H&R spacers.

[FSociety]

I would vote for ACS or just spending the extra money on Coilovers setup.
My friend with X5 35i base suspension got KW V3 and car is lowered;happy and handles better than ever.
Although if it was me, I would go with another Coilover company or just throw AC Schnitzer springs.
My X4 m40i currently on H&R and its exactly how you describe it

[DuSh]

Originally Posted by FSociety

I would vote for ACS or just spending the extra money on Coilovers setup.
My friend with X5 35i base suspension got KW V3 and car is lowered;happy and handles better than ever.
Although if it was me, I would go with another Coilover company or just throw AC Schnitzer springs.
My X4 m40i currently on H&R and its exactly how you describe it

Thanks for honesty, I appreciate it! Majority of users won't ever admit that H&R ride is bouncy. This just raises your credibility in my eyes

[DuSh]

I've heard that ACS is made by Eibach as well. Not sure if true. Are they both progressive springs? I know stock springs are constant rate springs and it would be nice to have some numbers to compare, but it's hard to find this info on internet for f15

[P1]

Originally Posted by DuSh

I've heard that ACS is made by Eibach as well. Not sure if true. Are they both progressive springs? I know stock springs are constant rate springs and it would be nice to have some numbers to compare, but it's hard to find this info on internet for f15

I have heard the same. Maybe r33_RGSport can confirm?

[r33_RGSport]

Originally Posted by P1et

I have heard the same. Maybe r33_RGSport can confirm?

Can't confirm on that. Haha. But seems like it.
Spring rate probably different.

[crackerjack15]

A spring isn't "bouncy". The factory shock, ie dampner, is not correctly paired with the higher spring rate. I don't know what the spring rates are, but obviously if your pairing an aftermarket spring that has a higher spring rate, with the stock struts/shocks and the spring rate is outside the dampening capability of the stock components, then yes it's going to be bouncy.

[FSociety]

Originally Posted by DuSh

Thanks for honesty, I appreciate it! Majority of users won't ever admit that H&R ride is bouncy. This just raises your credibility in my eyes

So maybe its not too bouncy as the stock springs are but nothing seems to beat a proper coilover setup but it helps if you have some type of Upgraded Suspension already. I wouldn't put springs on base suspension though.

Waiting to hear a friends experience on BC Racing Coilovers with Swift Springs.
Swift Springs are amongst the favorite within the F80 M3 right now. Have a friend with H&R Super Sport and he bent 2 wheels/2 flat just recent and has a Competition Pkg M3 which already comes with better dampers than stock F80 i think.

[r33_RGSport]

Originally Posted by crackerjack15

A spring isn't "bouncy". The factory shock, ie dampner, is not correctly paired with the higher spring rate. I don't know what the spring rates are, but obviously if your pairing an aftermarket spring that has a higher spring rate, with the stock struts/shocks and the spring rate is outside the dampening capability of the stock components, then yes it's going to be bouncy.

It is more to just a spring rate issue.
Remember that all of these springs are progressive rate.
The other issue that have to be considered is the damper length. With lowering a car, you will have less compression length and more rebound length.
And since the stock damper valved softly, with more rebound length and higher rate or even the same rate, the damper will rebound fast and compressed fast.
But again, it will depending on how much you are lowering the car.
With Eibach and ACS, the spring still put a pre-load to the damper, while H&R, it have less preload.

Originally Posted by FSociety

So maybe its not too bouncy as the stock springs are but nothing seems to beat a proper coilover setup but it helps if you have some type of Upgraded Suspension already. I wouldn't put springs on base suspension though.

Waiting to hear a friends experience on BC Racing Coilovers with Swift Springs.
Swift Springs are amongst the favorite within the F80 M3 right now. Have a friend with H&R Super Sport and he bent 2 wheels/2 flat just recent and has a Competition Pkg M3 which already comes with better dampers than stock F80 i think.

Spring on base suspension is fine, just depending on what you are trying to achieve. As I explained above, the lower you get, the worst the ride.
If you are looking for a proper coilover, I wouldn't even consider BC Racing Coilover, which is the same as Megan Coilover, and some other chinese brand.

Also, you can't blame a spring for a bent wheels or flats.
There are a lot of variable that can cause a bent wheels, such as; tire pressure, wheels material, the size of the pot hole, how hard the impact, etc.

Don't ever expect all M cars are built with the best. Trust me, I have hard core track customers that came in to replace their M cars stock suspension into high end coilovers.

[crackerjack15]

Originally Posted by r33_RGSport

It is more to just a spring rate issue.
Remember that all of these springs are progressive rate.
The other issue that have to be considered is the damper length. With lowering a car, you will have less compression length and more rebound length.
And since the stock damper valved softly, with more rebound length and higher rate or even the same rate, the damper will rebound fast and compressed fast.
But again, it will depending on how much you are lowering the car.
With Eibach and ACS, the spring still put a pre-load to the damper, while H&R, it have less preload.



Spring on base suspension is fine, just depending on what you are trying to achieve. As I explained above, the lower you get, the worst the ride.
If you are looking for a proper coilover, I wouldn't even consider BC Racing Coilover, which is the same as Megan Coilover, and some other chinese brand.

Also, you can't blame a spring for a bent wheels or flats.
There are a lot of variable that can cause a bent wheels, such as; tire pressure, wheels material, the size of the pot hole, how hard the impact, etc.

Don't ever expect all M cars are built with the best. Trust me, I have hard core track customers that came in to replace their M cars stock suspension into high end coilovers.

well said! And yes, as good as cars are today the engineers have to compromise a lot. Price, Ride quality, NVH, purpose, etc.

[DuSh]

I've heard good things about Ohlins Road and Track coilovers, but I don't think it's available for our f15

I wonder what is the best ultimate coilover system for f15 for road usage, not looking to track it

[r33_RGSport]

Originally Posted by DuSh

I've heard good things about Ohlins Road and Track coilovers, but I don't think it's available for our f15

I wonder what is the best ultimate coilover system for f15 for road usage, not looking to track it

KW Variant 3 is the best street coilover available in the market for the F15/F16 X5/X6 and F85/F86 X5M/X6M.

[Timberwolf]

I just like Violator above went with Eibach springs and spacers which I got from Ben at r33_RGSport. It's exactly what you are looking for.
Ride height is roughtly X5M stance and spacers make it look tough.

Ride is just what I wanted. Slightly tighter but with much less lean in the turns. Ideally as Ive said in a few other posts, a rear sway bar would finish it nicely. It's amazing on long drives and is still smooth over imperfections. I'm in the Northeast which says a lot about them since the roads are crap...