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F10 / F11 (2011 - Current)
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  #1  
Old 11-05-2013, 11:36 AM
onnad onnad is offline
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704 suspension vs Dinan Springs and M5/550d sways

I am having my BMW dealer quote retrofitting the 704 suspension on my 2013 550Xdrive MSport. Has anyone actually done this - are there any clearance issues with the all wheel drive components that would prevent this retrofit?

Aside from the likely higher cost, anyone have a point of view on how the 704 handles (roll, comfort over bumps, squat, dive) vs a Dinan Spring and M5 front / 550d rear sway setup?

My logic for trying the 704 retrofit is that the components were designed to work together on the 550 by BMW engineers so probably the best blend of handling and comfort. Also, my dealer said it would be esasier to get the 704 covered under warranty by other dealers in the future than using aftermarket springs and sway components from other BMW vehicles.

I plan on keeping the car for 5-7 years so the warranty piece is important to me.

Any thoughts?
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  #2  
Old 11-05-2013, 12:15 PM
grover432 grover432 is offline
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Doesn't your dealer know if it can be fitted to an x drive if he is quoting on it?
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  #3  
Old 11-05-2013, 12:37 PM
pharding pharding is offline
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That is a suspension for a RWD F10, not AWD F10.
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  #4  
Old 11-05-2013, 02:15 PM
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Sonicendeavor Sonicendeavor is offline
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Quote:
Originally Posted by onnad View Post
I am having my BMW dealer quote retrofitting the 704 suspension on my 2013 550Xdrive MSport. Has anyone actually done this - are there any clearance issues with the all wheel drive components that would prevent this retrofit?

Aside from the likely higher cost, anyone have a point of view on how the 704 handles (roll, comfort over bumps, squat, dive) vs a Dinan Spring and M5 front / 550d rear sway setup?

My logic for trying the 704 retrofit is that the components were designed to work together on the 550 by BMW engineers so probably the best blend of handling and comfort. Also, my dealer said it would be esasier to get the 704 covered under warranty by other dealers in the future than using aftermarket springs and sway components from other BMW vehicles.

I plan on keeping the car for 5-7 years so the warranty piece is important to me.

Any thoughts?
I priced the retrofit on a rwd 535i and at around $4,500 (parts + BMW labor + tax + alignment) it's far too expensive for a relatively minor improvement. In your case, I have to think if BMW felt the 704 would work on the xDrive, they would have offered it.
Also, warranty would only be impacted if something that was directly related to aftermarket suspension parts failed, so you don't really need to be that concerned about using third party suspension components.
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  #5  
Old 11-05-2013, 02:39 PM
onnad onnad is offline
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Pharding - I know it's a suspension for a rear wheel drive 550. I want to see if it will retrofit on an all wheel drive 500 as well.

Grover - I am the first person to ask if it will fit on a 2013 550 all wheel drive vehicle at my dealership so the dealer SM is checking to see if the parts (struts, springs, sways) would work / fit on an X Drive with no issues.

Sonicendeavor - I assumed it would be $3,000 - $4,000. Not sure I necessarily agree BMW would have offered it on all wheel drive if it fits. All the 704 passive suspension is comprised of is thicker sway bars, tighter springs and more robust struts. Plenty of people on this forum have put aftermarket springs and replacement sways on an F10 X drive so it can be done

BMW seems to market the F10 X Drive model as appropriate for those who want safety and the rear wheel drive model for those who want performance. I happen to live in a Northern climate with 4 months of snow and ice so I'm trying to achieve both objectives.

Will keep everyone posted if the 704 struts, springs and sway bars can actually be retrofit on a 550 X Drive. Otherwise, I'll go with Dinan 550 XDrive springs and M5 front sway (26mm) and 550d or 650xi rear sways (16mm).
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  #6  
Old 11-05-2013, 03:17 PM
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Sonicendeavor Sonicendeavor is offline
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The right aftermarket suspension is not a problem as I stated. I'm fully aware of exactly which compnents are involved in rhe 704. My point is that the 704 is probably not the right suspension.
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  #7  
Old 11-05-2013, 04:06 PM
onnad onnad is offline
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Well if my SM concludes the 704 struts, springs and sways fit on a 550 xdrive, I will likely do it and report back to everyone how it drives vs the standard 2013 550 xdrive suspension.

I test drove a 2013 550 rear drive with the 704 suspension and for me it was the right balance of comfort and sportiness and it is definitely better than the 2013 550 xdrive soft, floaty, roll prone suspension

I don't want to lower my car dramatically or street race it or track it and i plan to own it for 5 -7 years so alot of these aftermarket solutions that work great for others on the forum may not be right for me.

If the 704 components don't fit, I'll go with dinan springs (and hope stock struts don't fail prematurely) as well as m5 / 550d sways.
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  #8  
Old 11-05-2013, 05:40 PM
shoek shoek is offline
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I think you can actually improve on the feel and performance of the 704 by going the aftermarket route.
ACS or Dinan springs to bring down the center of gravity
Lighter wheels to reduce unsprung weight
non-RFT tires for quieter, grippier ride
M5/550d sway bars for tighter turn-in, level cornering (if you don't have active stabilization)

The one thing you could look at is swapping in the 704 struts (if you don't electronic damping struts)
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  #9  
Old 11-05-2013, 05:58 PM
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dunderhi dunderhi is online now
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I had the RWD version of the Dinan springs on my 550xi and currently have 704s on my 650xi. Both fit fine (especially since the 704s are stock). The Dinan springs are stiffer, but not so much that I would replace my 704s.
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  #10  
Old 11-08-2013, 11:24 AM
onnad onnad is offline
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Dunderhi

Thanks for input. You mentioned the Dinan springs are stiffer than the OEM 704 springs but you wouldn't change out the OEM's due to the small difference. Is it fair to say the Dinan's have a bit less roll, dive, squat than the 704 springs but the ride of the OEM 704 springs is a bit less harsh than the Dinan springs?
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  #11  
Old 11-09-2013, 05:43 PM
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dunderhi dunderhi is online now
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Quote:
Originally Posted by onnad View Post
Dunderhi

Thanks for input. You mentioned the Dinan springs are stiffer than the OEM 704 springs but you wouldn't change out the OEM's due to the small difference. Is it fair to say the Dinan's have a bit less roll, dive, squat than the 704 springs but the ride of the OEM 704 springs is a bit less harsh than the Dinan springs?
I would say it's fair to say those things. The only time my current suspension annoys me is when I turn from a side road onto a major road and I progressively nail the throttle as i turn. The back-end wiggles a bit too much for my likes. Maybe it's the traction control fighting me or it could be the springs. My 550xi with Dinan didn't have this issue, but the 650 seems to have more rear bias in the xDrive system. That said, going hard into a clover leaf with steady power the 704 + ARS really hold the car tight while the tires sing. So overall, the car feels tight enough as is, but if I could have ticked firmer springs as an option, I would have done so.
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  #12  
Old 05-05-2014, 01:39 PM
mini-me mini-me is offline
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@onnad what option did you end up going with?
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  #13  
Old 05-06-2014, 05:08 AM
onnad onnad is offline
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I live in Chicago and with the record snow / ice this winter, there wasn't much chance for performance driving from Dec - Apr so I decided to wait until after winter to do the suspension upgrade. Since November when I last posted on this, I spoke with my local BMW dealer that is also a Dinan dealer and they recommended the Dinan springs first and if that wasn't satisfactory, then change the front and rear sways. I plan on doing the Dinan springs over the next month or so.
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