AST 5100 Coilovers

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stag74
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Re: AST 5100 Coilovers

Post by stag74 » Sat Jun 09, 2018 2:54 pm

Interesting thread.
I'm on stock passive and doing high miles for business (7K last 3 months since purchase) can see the value for money in changing.
I too feel too much power for the chassis as stock, far too much bounce and Bob Bob on our imperfect motorways when cruising.
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Toube
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Re: AST 5100 Coilovers

Post by Toube » Sat Jun 09, 2018 10:12 pm

stag74 wrote:
Sat Jun 09, 2018 2:54 pm
Interesting thread.
I'm on stock passive and doing high miles for business (7K last 3 months since purchase) can see the value for money in changing.
I too feel too much power for the chassis as stock, far too much bounce and Bob Bob on our imperfect motorways when cruising.
I will do a short back to back write up next weekend when I have the AST 5100 chassis installed again.
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

stag74
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Re: AST 5100 Coilovers

Post by stag74 » Sun Jun 10, 2018 9:39 am

Toube wrote:
Sat Jun 09, 2018 10:12 pm
stag74 wrote:
Sat Jun 09, 2018 2:54 pm
Interesting thread.
I'm on stock passive and doing high miles for business (7K last 3 months since purchase) can see the value for money in changing.
I too feel too much power for the chassis as stock, far too much bounce and Bob Bob on our imperfect motorways when cruising.
I will do a short back to back write up next weekend when I have the AST 5100 chassis installed again.
That would be great.
It has also got me looking at the Birds kit too.
M140i 3 Door Manual

Jahjaman
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Re: AST 5100 Coilovers

Post by Jahjaman » Mon Jun 11, 2018 12:16 am

Toube - is that design flaw with the exposed adjustment screw typical of all coilover products, or just the AST?
Not a good thing if it's the latter, I'd be looking elsewhere as I don't want to be re-greasing every few months.
Aussie M140i 5 door
Quaife LSD - Eibach Pro springs - SuperPro camber bushes - BCS cat back (boost flap deleted - electric actuator flap retrofitted)

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Toube
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Re: AST 5100 Coilovers

Post by Toube » Mon Jun 11, 2018 5:14 am

Jahjaman wrote:
Mon Jun 11, 2018 12:16 am
Toube - is that design flaw with the exposed adjustment screw typical of all coilover products, or just the AST?
Not a good thing if it's the latter, I'd be looking elsewhere as I don't want to be re-greasing every few months.
Yeah it is and they have fixed it in the latest versions or in the upcoming versions of the coilovers.
If you need more information please contact Julian from AST headquarters in Holland.
julian@ast-suspension.com
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

Jahjaman
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Re: AST 5100 Coilovers

Post by Jahjaman » Mon Jun 11, 2018 6:19 am

Toube wrote:
Mon Jun 11, 2018 5:14 am
Yeah it is and they have fixed it in the latest versions or in the upcoming versions of the coilovers.
Very good to know, thank you.
Aussie M140i 5 door
Quaife LSD - Eibach Pro springs - SuperPro camber bushes - BCS cat back (boost flap deleted - electric actuator flap retrofitted)

BMW M Lite Owners Group AU & NZ
https://www.facebook.com/groups/248993522276877/

Toube
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Re: AST 5100 Coilovers

Post by Toube » Fri Jun 15, 2018 2:16 pm

Ast 5100 rebuilt and installed on the M140i.. immediate impression is the steering that is much more sharper now. Also the handling is better.. now it doesn't feel like your running on wet tarmac when cruising on motorway and accelerating on takeovers. I still need to take it back to the tuning company next week.. we had a misunderstanding about the height.. it now sits higher than stock suspension which is not to my liking.. looks like a suv :D
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

R88ory
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Re: AST 5100 Coilovers

Post by R88ory » Mon Jun 18, 2018 2:07 pm

Toube wrote:
Sat Jun 09, 2018 5:32 am
R88ory wrote:
Fri Jun 16, 2017 6:27 am
Jahjaman wrote:
Fri Jun 16, 2017 6:09 am
Are they replacing adaptive dampers or standard suspension?
Standard passive. I did not order adaptive due to thinking I would probably go with some form of aftermarket option.
Question did you also have the front AST drop links installed?
At first I used the stock front drop links (back still oem) but it only took one or two drives and the front drop links were destroyed so I had to order the AST front drop links that are a little bit stronger than the oem ones😀

-Toube
No I stuck with stock but I'm going to check to see what condition they are in. Done around 9000 miles on them now, still love the suspension no issues at all.

Toube
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Re: AST 5100 Coilovers

Post by Toube » Mon Jun 18, 2018 6:04 pm

R88ory wrote:
Mon Jun 18, 2018 2:07 pm
No I stuck with stock but I'm going to check to see what condition they are in. Done around 9000 miles on them now, still love the suspension no issues at all.
Yeah I would recommend switching the stock ones out.
Though I think the stock arbs are pretty mushy.. I actually drove a while without the drop links attached to the dampers and I'm not sure I noticed too much of a difference when attaching the drop links back with the arbs.. that just tells us that the AST 5100 is a good set to go with.
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

R88ory
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Re: AST 5100 Coilovers

Post by R88ory » Mon Jun 18, 2018 6:41 pm

Toube wrote:
Mon Jun 18, 2018 6:04 pm
R88ory wrote:
Mon Jun 18, 2018 2:07 pm
No I stuck with stock but I'm going to check to see what condition they are in. Done around 9000 miles on them now, still love the suspension no issues at all.
Yeah I would recommend switching the stock ones out.
Though I think the stock arbs are pretty mushy.. I actually drove a while without the drop links attached to the dampers and I'm not sure I noticed too much of a difference when attaching the drop links back with the arbs.. that just tells us that the AST 5100 is a good set to go with.
Yes they are rather good!!

Toube
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Re: AST 5100 Coilovers

Post by Toube » Thu Jun 21, 2018 10:52 pm

Hi Guys,

for some reason the rear right damper is giving out this terrible knocking sound when driving over small potholes.
I didn't have this knocking sound with the same dampers on my old beloved M135i.
Could there be something that is loose? The dampers are rebuilt and services so they should be in good shape.

-Toube
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

Toube
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Re: AST 5100 Coilovers

Post by Toube » Sat Jun 23, 2018 7:23 am

Anyone, any experience of such a problem / behavior?
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

ronanh
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Re: AST 5100 Coilovers

Post by ronanh » Sat Jun 23, 2018 7:52 am

Possibly a damaged top mount or roll bar link?
2016 F21 LCI M135i AW

Toube
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Re: AST 5100 Coilovers

Post by Toube » Sat Jun 23, 2018 8:10 am

ronanh wrote:
Sat Jun 23, 2018 7:52 am
Possibly a damaged top mount or roll bar link?
Hi,
thanks for replying.
Roll bar link, you mean the drop link? That one I can check for my self. The top mount in the rear are probably pretty hard to check for myself?
Current M140i F20 MG, manual, pretty much standard package, AST 5100 coilovers + AST front drop links, Mpe, mp gear knob, underbelly brace
Previous BMW M135i, Megane RS250 CUP

ronanh
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Re: AST 5100 Coilovers

Post by ronanh » Sat Jun 23, 2018 8:16 am

Yeah the drop link. Check to see if it loose.

If you take the wheel off you should be able to get a good look at the top mount. I've seen these crack before when the fixing bolts have been over tightened (not on a f20 though)

If you take the wheel off have a good look around all of the suspension to make sure nothing is loose
2016 F21 LCI M135i AW

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