AST 5100 installation, please help

e679 · 05-16-2013, 09:06 AM

I have just installed a set of AST 5100 but the spring perch is too low. To avoid rubbing on the coilovers, I have to add 15mm spacers but now they rub on the fenders.

Had anyone installed 5100 on e9x with stock top mount? Can anyone help me to set these up correctly by bringing up the perch also avoid rubbing on the adjustable sway mount? Thanks in advance.

Springs are AST 7" 60 N/mm with helper.

My rims' off set was good with stock suspension.
ET35 8.5 with 235 tire

below pics are with 15mm spacer and rubbing the fender.

Evochuck · 05-16-2013, 10:40 AM

Perhaps removing the helper would help? Also seems like you have about 10mm of clearence there, you could probably getaway with 10 or 12 mm spacers.

CJ421 · 05-16-2013, 11:03 AM

What is your camber up front?

+1 test a smaller spacer, the minimum you can get away with.

e679 · 05-16-2013, 11:17 PM

Evochuck was right. 10mm spacer is the minimum size to avoid rubbing the coil but it will still rub with the fender (I think there is only 5mm between tire and fender originally). Since I already have a 15mm spacer, so I rather invest in a better solution.

CJ421: front camber is -1 with M3 control arms.

Thanks for reply.

jpirelli · 05-17-2013, 09:53 AM

Quote:

Originally Posted by e679

Evochuck was right. 10mm spacer is the minimum size to avoid rubbing the coil but it will still rub with the fender (I think there is only 5mm between tire and fender originally). Since I already have a 15mm spacer, so I rather invest in a better solution.

CJ421: front camber is -1 with M3 control arms.

Thanks for reply.

Set up more negative camber. What's the point of M3 control arms if you're only going to run -1.

e679 · 05-17-2013, 10:52 PM

Lol. Damn, I May need -3 camber to clear.

Will it works by replacing the front spring to 6 inches?

subieworx · 05-19-2013, 06:07 PM

Coming from a one time AST owner I understand your concern. If your car was like mine the wheel barely rubbed the spring perch. I got enough clearance by simply grinding the spring perch down slightly. I also was not using a help spring as they are not needed with the little amount of stroke the dampers have.

e679 · 05-20-2013, 12:58 AM

Quote:

Originally Posted by subieworx

Coming from a one time AST owner I understand your concern. If your car was like mine the wheel barely rubbed the spring perch. I got enough clearance by simply grinding the spring perch down slightly. I also was not using a help spring as they are not needed with the little amount of stroke the dampers have.

Thx subieworx, are you using 7" springs and without camber plates?

I understand the plates are usually an inch shorter than OE top mount

I am thinking to buy hyperco helper and 6" front. Buy I afraid 6" cuz insufficient travel.

05-16-2013, 09:06 AM	#1
e679 Private First Class 9 Rep 117 Posts Drives: E93 Join Date: Dec 2011 Location: Hong Kong iTrader: (0)	AST 5100 installation, please help I have just installed a set of AST 5100 but the spring perch is too low. To avoid rubbing on the coilovers, I have to add 15mm spacers but now they rub on the fenders. Had anyone installed 5100 on e9x with stock top mount? Can anyone help me to set these up correctly by bringing up the perch also avoid rubbing on the adjustable sway mount? Thanks in advance. Springs are AST 7" 60 N/mm with helper. My rims' off set was good with stock suspension. ET35 8.5 with 235 tire below pics are with 15mm spacer and rubbing the fender. Attached Images __________________ E93 335i Alpine White, 19" Works, PSS, M3 arms, M3 bushings,M3 E93 FSB/E92 RSB, powerflex rear diff bush. AST 5100 with M3 rear camber arms. GC street plates.
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05-16-2013, 10:40 AM	#2
Evochuck Lieutenant 69 Rep 404 Posts Drives: 335xi 09 Join Date: Jan 2013 Location: Montreal iTrader: (2)	Perhaps removing the helper would help? Also seems like you have about 10mm of clearence there, you could probably getaway with 10 or 12 mm spacers.
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05-16-2013, 11:03 AM	#3
CJ421 Brigadier General 1564 Rep 4,109 Posts Drives: BMW M3 Join Date: Feb 2011 Location: Blue Bell, PA iTrader: (1) Garage List 2024 BMW M3 Sedan [9.50]	What is your camber up front? +1 test a smaller spacer, the minimum you can get away with. __________________ 2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara \| 2017 F30 340i Mineral Gray/Coral Red, 6MT \| 2011 E92 335i Le Mans Blue/Black, 6MT
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05-16-2013, 11:17 PM	#4
e679 Private First Class 9 Rep 117 Posts Drives: E93 Join Date: Dec 2011 Location: Hong Kong iTrader: (0)	Evochuck was right. 10mm spacer is the minimum size to avoid rubbing the coil but it will still rub with the fender (I think there is only 5mm between tire and fender originally). Since I already have a 15mm spacer, so I rather invest in a better solution. CJ421: front camber is -1 with M3 control arms. Thanks for reply. __________________ E93 335i Alpine White, 19" Works, PSS, M3 arms, M3 bushings,M3 E93 FSB/E92 RSB, powerflex rear diff bush. AST 5100 with M3 rear camber arms. GC street plates. Last edited by e679; 05-17-2013 at 04:58 AM..
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05-17-2013, 10:52 PM	#6
e679 Private First Class 9 Rep 117 Posts Drives: E93 Join Date: Dec 2011 Location: Hong Kong iTrader: (0)	Lol. Damn, I May need -3 camber to clear. Will it works by replacing the front spring to 6 inches? __________________ E93 335i Alpine White, 19" Works, PSS, M3 arms, M3 bushings,M3 E93 FSB/E92 RSB, powerflex rear diff bush. AST 5100 with M3 rear camber arms. GC street plates.
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05-19-2013, 06:07 PM	#7
subieworx Lieutenant 30 Rep 468 Posts Drives: 07 335 Join Date: Jun 2010 Location: Ohio iTrader: (1)	Coming from a one time AST owner I understand your concern. If your car was like mine the wheel barely rubbed the spring perch. I got enough clearance by simply grinding the spring perch down slightly. I also was not using a help spring as they are not needed with the little amount of stroke the dampers have.
	Appreciate 0 Quote