123d suspension upgrade

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Ads1991
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123d suspension upgrade

Post by Ads1991 » Sat May 12, 2018 9:06 am

Hi guys

Ive got a remapped 09 123d msport. I was happy with the car untill someone decided to run into the rear left corner of me and write the car off..... The insurance company offered me a good cash + car offer which i am going to accept.

The rear subframe will need to be removed for the repairs and it looks like i will need to change the springs. While the car is apart im wanting to upgrade the suspension. This will be for road use and the occasional track day.

From what i can see so far eibach pro kit and m3 front lca are the obvious choice.

What bushes shall i change? And where to buy them from?

Where to buy the front and rear bumpstops?

If dampers are required are b4 still the best to go for?

Anything i have missed?

Cheers

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marco_polo
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Re: 123d suspension upgrade

Post by marco_polo » Sat May 12, 2018 9:10 am

What's the budget for mods?

For fast road and track I'd be going Bilstein B12 kit (from eBay.de), TRW M3 LCA's (from Amazon) and Nolathane REV094.0016 rear subframe inserts (from lots of motorsport shops).
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Ads1991
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Re: 123d suspension upgrade

Post by Ads1991 » Sat May 12, 2018 9:42 am

marco_polo wrote:
Sat May 12, 2018 9:10 am
What's the budget for mods?

For fast road and track I'd be going Bilstein B12 kit (from eBay.de), TRW M3 LCA's (from Amazon) and Nolathane REV094.0016 rear subframe inserts (from lots of motorsport shops).
I was hoping around 500 for parts if the dampers dont need changing. If the dampers need changing i have extra money for this.

Ill see if i can find the b12 kit on ebay.de

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tbt
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Re: 123d suspension upgrade

Post by tbt » Sat May 12, 2018 10:54 am

Dampers and bumpstops make the biggest difference in my opinion. So if there’s anything that should be at the top of your priorities then I would put dampers at number 1.
If your springs need replacing then it makes sense to get the kit. The Bilstein B12 kit comes with much shorter bumpstops for the rear and the front bumpstops are built into the shocks so you don’t need to buy further parts.
It’s a great value for money upgrade and will be well suited for your use of the car.
This alone would fully use up your budget, but if you can stretch to M3 arms then you will appreciate the difference as they have spherical bushings rather than rubber and give the steering a much sharper feel.



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2006 E87 130i BMWP Parts-[Exhaust/Intake/Fr & Rr Brakes/Strut Brace/SS Kit]
M3 Parts-[Rear Subframe/Rear upper arms/Front Tension & LCA]
Quaife LSD, Bilstein B12 kit, Megan Racing toe arms, E46 M3 trans mounts, CDV delete

Ads1991
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Re: 123d suspension upgrade

Post by Ads1991 » Sat May 12, 2018 5:19 pm

Shopping list so far:
B12 kit £575 ebay.de
Trw lca x2 £100 amazon (out of stock)
Nolathene RSF inserts £40 ebay (out of stock)

Anything else cheap while the car is apart on the ramp? Any other bushes?

Once this is all done and settled in for a week ill look into alignment. Am i right in thinking 0 toe and -1.5 camber all round?

My last track day at bedford i really struggled with understeer and bodyroll. I assume after this ill be able to keep with those pesky clios in the corners? Does the heavy diesel engine cause this?

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Re: 123d suspension upgrade

Post by marco_polo » Sat May 12, 2018 5:48 pm

RS Clio's are a bit quick, I don't want to make you any false promises.

What tyres are you running? Makes, sizes, pressures, load index, etc?

As for alignment, you'll have no say in front camber, it's not really adjustable. Rear camber is fine around 1 degree 50 minutes. I'd want a bit of rear toe-in to reduce twichiness, but you can go near parallel on the fronts if you don't mind trading some stability for a better turn-in.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Re: 123d suspension upgrade

Post by Ads1991 » Sat May 12, 2018 6:23 pm

Ive got the 18" alloys. Michelin ps4 XL 225 front 245 rear. I try to run 32psi on all 4. That was the best balance i could find at bedford.

When i did Anglesey last year i had 255 rears and the car was much better. Im hoping it is just difference in corner speeds between the tracks.

Going brands in June if the car is ready

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Re: 123d suspension upgrade

Post by marco_polo » Sat May 12, 2018 6:47 pm

All sounds good to me. The balance should be better with your current 245 rears, going back to a 255 would/should promote more understeer.
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Re: 123d suspension upgrade

Post by marco_polo » Sat May 12, 2018 7:54 pm

Have you already done the camber pin mod?
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Norcy91
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Re: 123d suspension upgrade

Post by Norcy91 » Sat May 12, 2018 8:58 pm

Check out Balance Motorsport for the Nolathane Bush Insert Kit, I've just ordered some for slightly over £42 inc delivery. Only ordered this afternoon so cannot comment on delivery/customer service :lol:

Ads1991
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Re: 123d suspension upgrade

Post by Ads1991 » Sat May 12, 2018 9:45 pm

marco_polo wrote:
Sat May 12, 2018 7:54 pm
Have you already done the camber pin mod?
Nope. I wasn't aware of it untill yesterday. Is it still worth doing after the m3 lca?

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Re: 123d suspension upgrade

Post by marco_polo » Sat May 12, 2018 10:04 pm

Yes, do both.

If it's still not enough (probably won't be) ask THE TYRANT about his camber plates.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Toed64
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Re: 123d suspension upgrade

Post by Toed64 » Tue May 15, 2018 10:55 pm

If your subframe is coming off for the repairs, consider a rear antiroll bar upgrade while it's off. The OE rear bar is a fairly pathetic pencil-thick thing and stiffening up the back end made a big difference to the car's behaviour.

I fitted an M3 rear bar and loved it, but many have said they found it too stiff without a limited slip diff.
2008 E81 130i
2010 E82 135i - now sold

Ads1991
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Re: 123d suspension upgrade

Post by Ads1991 » Wed May 16, 2018 5:46 pm

How did it change the handling? I want less understeer and bodyroll.

Where did you buy yours from? What m3?

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Toed64
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Re: 123d suspension upgrade

Post by Toed64 » Sun May 20, 2018 10:13 am

Fitting the stiff M3 rear ARB sharpened the turn-in and got rid of the understeer that disappointed me so much. The pay off was reduced traction out of slow corners, when the inside rear wheel would unweight rather more quickly. This caused the nannies to kick in and turn the power down, so DTC was standard driving mode...this made no difference to me as DTC was/is the standard position for me - I dislike the computer interfering with my intent to accelerate swiftly. I would rather decide if I need to feather the throttle, or let the car slip a little.

I liked the M3 bar and did not mind driving around the occassional momentary wheel lift. The steering was sharpened dramatically and high speed stability was improved a lot. The car sat very flat and cornering lines could be tightened and adjusted without the car squirming and washing out, as had origninally been the case with the OE pencil. The rear subframe bushes improved this too.

In discussion here on this forum, most have said that the M3 rear bar was too stiff with a standard diff, or even with a Quaiffe that behaves like an open diff when the inside wheel lifts. Graearea has a nicely sorted 130i that he uses on track a lot. He had an M3 bar on the back, his car has a Quaiffe and coilovers, and he ended up replacing it with a thinner (I believe 15mm bar) to reduce the inner wheel lift that was an issue on track.

My 130i does not have an E-diff (maybe the 123ds do) and I don't think I'll fit such a stiff rear bar. I might fit a slightly more moderate rear ARB (maybe 335i - about 15mm I believe), but with the mods I have fitted already, my 130i is superbly sorted and nicely balanced. So much so, that I have postponed fitting a limited slip diff, because traction/grip is so rarely an issue.

I did find an M3 convertible front ARB (tapered in the middle - & consequently will not foul the E-PAS motor) and it is waiting in my garage. I bought it from someone advertising on ebay. The M3 bars I bought for my 135i were almost new and had been removed by a local tuning company when they were fitting silly air-ride suspension to a customer's show car.
Last edited by Toed64 on Fri May 25, 2018 12:05 pm, edited 1 time in total.
2008 E81 130i
2010 E82 135i - now sold

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