BMW F06 640d GC xDrive with M Package lowering with ACS springs

ciscospirit · 03-10-2018, 03:47 PM

Hello,

i own a BMW F06 640d GC xDrive from 2015 (so with the Facelift) and have the full M-Package and Adaptive Drive installed.
For wheels i use the BMW 20" 373M wheels for summer and BMW 18" 613M wheels for winter.

I am thinking about to lowering my car now with the AC Schitzer springs designed for the GC xDrive 3133212710/3353212510.
As i can read on the website of AC Schnitzer, this should be lowering about 30mm in front and 20mm in rear.
The installation would be done by an official BMW dealer with chassis measurement after the installation, so no homebrew botch.

I have the ACS springs already at home and have an installation schedule for next week, but I am not sure now, if i should do it.
I researched a bit in German forums and there some thought that the handling would be deteriorated, since just the M-package should have its problems.

Quote:

Reason: the M chassis is already lower than series and here springs and dampers are optimally matched.
If you now have a component - e.g. The springs for shorter exchange changes the wonderful handling of the M suspension so negative that you will have no joy. Giving up just for the optics makes no sense.
Your limit range in which you can drive the car shrinks by "only springs" by 40% because the chassis is now completely unbalanced.

Can anybody confirm this and are there any more disadvantages after the installation?

Would be nice to get a professional feedback and user reviews.
Thanks!

ciscospirit · 03-12-2018, 04:35 PM

hm does nobody has an answer for me?

$howtime456 · 03-13-2018, 10:54 AM

not going to be much of a drop with those springs. Should be fine with handling

upstate650 · 03-13-2018, 11:04 AM

Are those springs 640 d specific? If not, Because you have a 640d, no one really knows what will happen. No 640d's in the states at all, which is where most of the members of this forum are located.

If I were you, I would want to know the weight of the diesel motor v. the six cylinder v. the 8 motor, so you can see where the weight falls. You may end up seeing more of a drop if the diesel motor weighs more than the gassers, and it also may ride differently than designed, ie bigger drop but have more bounce.

ACS springs are the smallest drop but the best riding of the aftermarket springs, so if the weight of the motors isn't too far off you should be fine.

The good thing is that if you don't like the result it is easily reversible.

ciscospirit · 03-14-2018, 07:36 AM

Quote:

Originally Posted by upstate650

Are those springs 640 d specific? If not, Because you have a 640d, no one really knows what will happen. No 640d's in the states at all, which is where most of the members of this forum are located.

If I were you, I would want to know the weight of the diesel motor v. the six cylinder v. the 8 motor, so you can see where the weight falls. You may end up seeing more of a drop if the diesel motor weighs more than the gassers, and it also may ride differently than designed, ie bigger drop but have more bounce.

ACS springs are the smallest drop but the best riding of the aftermarket springs, so if the weight of the motors isn't too far off you should be fine.

The good thing is that if you don't like the result it is easily reversible.

Hello,

yah i live in Austria/Europe and there are just 640d arround me. Very hard to find a "i" model.
As i can see on internet their should be not much weight difference to the 640i engine.
but we will see in 2 hours... the car is already at the dealer for the modification

yes it should be just the "smallest" drop. if i reach the 25-30mm i am happy enough

ciscospirit · 03-16-2018, 06:05 PM

Hello,

the build in is done and it looks amazing.
Before i could insert 3 fingers on the front wheels, now i can insert 1 1/2. so about 25mm lower like before.
At the rear it is the same. Looks awesome already with winter wheels.

handling i can't say anything bad about. doesn't feel any negative differences like with original springs.
attached there is the BMW KDS protocol.

ciscospirit · 03-16-2018, 07:49 PM

Here is my KDS protocol.
It looks good, i think.

the Sturz on the left rear is just 17 minutes more like on the right rear but within the tolerance.
and on the front Strutz, there is also 15 minutes difference on left to right.

upstate650 · 03-20-2018, 01:49 AM

Pictures please!

03-12-2018, 04:35 PM	#2
ciscospirit Enlisted Member 10 Rep 42 Posts Drives: BMW M8 Competition (F93) Join Date: Jan 2018 Location: Graz iTrader: (0)	hm does nobody has an answer for me?
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03-13-2018, 10:54 AM	#3
$howtime456 Major 301 Rep 1,230 Posts Drives: BMW 640i Join Date: Mar 2017 Location: NY iTrader: (0)	not going to be much of a drop with those springs. Should be fine with handling __________________ N55 GENERAL David Shoup Tuned Fully Built By Miami Engines/Project Motorworks Precision 6266 On Steroids
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03-13-2018, 11:04 AM	#4
upstate650 Lieutenant Colonel 305 Rep 1,719 Posts Drives: 2014 650xi Gran Coupe Msport Join Date: May 2013 Location: The Hinterlands of Upstate NY iTrader: (3) Garage List 2020 BMW M340xi [0.00]	Are those springs 640 d specific? If not, Because you have a 640d, no one really knows what will happen. No 640d's in the states at all, which is where most of the members of this forum are located. If I were you, I would want to know the weight of the diesel motor v. the six cylinder v. the 8 motor, so you can see where the weight falls. You may end up seeing more of a drop if the diesel motor weighs more than the gassers, and it also may ride differently than designed, ie bigger drop but have more bounce. ACS springs are the smallest drop but the best riding of the aftermarket springs, so if the weight of the motors isn't too far off you should be fine. The good thing is that if you don't like the result it is easily reversible. __________________ 2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic on full black merino leather. 20" M5 343M wheels for summer, 20" 373 wheels for winter with Nokian Hakkapeliitta 8 studded snow tires. M6 CP exhaust with M6 Diffuser and ///M Performance carbon fiber finisher. Mission Performance stage 1.5 and transmission tune.
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03-16-2018, 06:05 PM	#6
ciscospirit Enlisted Member 10 Rep 42 Posts Drives: BMW M8 Competition (F93) Join Date: Jan 2018 Location: Graz iTrader: (0)	Hello, the build in is done and it looks amazing. Before i could insert 3 fingers on the front wheels, now i can insert 1 1/2. so about 25mm lower like before. At the rear it is the same. Looks awesome already with winter wheels. handling i can't say anything bad about. doesn't feel any negative differences like with original springs. attached there is the BMW KDS protocol. Last edited by ciscospirit; 03-17-2018 at 02:42 PM..
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03-16-2018, 07:49 PM	#7
ciscospirit Enlisted Member 10 Rep 42 Posts Drives: BMW M8 Competition (F93) Join Date: Jan 2018 Location: Graz iTrader: (0)	Here is my KDS protocol. It looks good, i think. the Sturz on the left rear is just 17 minutes more like on the right rear but within the tolerance. and on the front Strutz, there is also 15 minutes difference on left to right. Attached Images Last edited by ciscospirit; 03-17-2018 at 02:45 PM..
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03-20-2018, 01:49 AM	#8
upstate650 Lieutenant Colonel 305 Rep 1,719 Posts Drives: 2014 650xi Gran Coupe Msport Join Date: May 2013 Location: The Hinterlands of Upstate NY iTrader: (3) Garage List 2020 BMW M340xi [0.00]	Pictures please!
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