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      07-06-2019, 06:54 AM   #1
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Hi everyone, I have searched this subject & found a few posts, but am looking for a decent opinion. I now have ACS Sports Dampers fitted along with the Springs, that were fitted when I got the car a year & a half ago. I am very pleased with the comfort & body control, which is better than the adaptive dampers fitted as standard.
My question is whether there is any detriment to the comfort if I fitted the 15mm ARB's?
I have fitted standard tyres now as well (Michelin PS4's)

I just feel that it might reduce the small amount of understeer that I am experiencing, especially at medium speeds ... It seems better at higher speeds.


I look forward to hearing from anyone.

Cheers, Mark
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      07-06-2019, 09:32 AM   #2
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There won't be a tangible degradation of comfort when going to the 15mm bar. But it is enough to add a level of stiffness to the rear. Still OEM style stiffness, not too crazy, but there.

An excellent upgrade. Fairly low cost too if prepared to DIY.

https://f30.bimmerpost.com/forums/sh....php?t=1043440
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      07-06-2019, 10:54 AM   #3
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Quote:
Originally Posted by NISFAN View Post
There won't be a tangible degradation of comfort when going to the 15mm bar. But it is enough to add a level of stiffness to the rear. Still OEM style stiffness, not too crazy, but there.

An excellent upgrade. Fairly low cost too if prepared to DIY.

https://f30.bimmerpost.com/forums/sh....php?t=1043440
And I promise @nisfan I will collect yours from you ASAP...
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      07-06-2019, 02:15 PM   #4
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Quote:
Originally Posted by McBeemer View Post
Hi everyone, I have searched this subject & found a few posts, but am looking for a decent opinion. I now have ACS Sports Dampers fitted along with the Springs, that were fitted when I got the car a year & a half ago. I am very pleased with the comfort & body control, which is better than the adaptive dampers fitted as standard.
My question is whether there is any detriment to the comfort if I fitted the 15mm ARB's?
I have fitted standard tyres now as well (Michelin PS4's)

I just feel that it might reduce the small amount of understeer that I am experiencing, especially at medium speeds ... It seems better at higher speeds.


I look forward to hearing from anyone.

Cheers, Mark
I asked Lorcan at ACS about this just before I had their springs and dampers fitted.
He suggested that with ACS springs and dampers they felt the 15 mm ARB would add nothing to the handling.
Id be very keen to hear if it does improve things.
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      07-06-2019, 03:26 PM   #5
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Quote:
Originally Posted by flashollie View Post
Quote:
Originally Posted by McBeemer View Post
Hi everyone, I have searched this subject & found a few posts, but am looking for a decent opinion. I now have ACS Sports Dampers fitted along with the Springs, that were fitted when I got the car a year & a half ago. I am very pleased with the comfort & body control, which is better than the adaptive dampers fitted as standard.
My question is whether there is any detriment to the comfort if I fitted the 15mm ARB's?
I have fitted standard tyres now as well (Michelin PS4's)

I just feel that it might reduce the small amount of understeer that I am experiencing, especially at medium speeds ... It seems better at higher speeds.


I look forward to hearing from anyone.

Cheers, Mark
I asked Lorcan at ACS about this just before I had their springs and dampers fitted.
He suggested that with ACS springs and dampers they felt the 15 mm ARB would add nothing to the handling.
Id be very keen to hear if it does improve things.
@Tengocity can answer this as he had 15mm with ACS springs and eventually RS kit.
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      07-06-2019, 03:27 PM   #6
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Originally Posted by dizzy619 View Post
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      07-06-2019, 03:35 PM   #7
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I tried big thick birds ARBs, and they were too stiff for the F30 in my opinion, so went back to OEM ones when i fitted coilovers, but went to the 15mm rear one, and I think it worked a treat. The Diesel engines cars are pretty nose heavy and this really nicely helped the front to rear balance. Would be an ideal mod to finish off a car on good suspension.
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      07-07-2019, 01:21 AM   #8
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I have zero regrets swapping out the rear ARB on mine. It adds that little more needed control. The car handles a lot better and is less tail happy. If you're into your curves, sweeping bends and, the odd sharp corner it is worth it. No deterioration of comfort. This is on my 435d X Drive.
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      07-07-2019, 03:22 AM   #9
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Quote:
Originally Posted by Tengocity View Post
I tried big thick birds ARBs, and they were too stiff for the F30 in my opinion, so went back to OEM ones when i fitted coilovers, but went to the 15mm rear one, and I think it worked a treat. The Diesel engines cars are pretty nose heavy and this really nicely helped the front to rear balance. Would be an ideal mod to finish off a car on good suspension.
Quote:
Originally Posted by Chelsea_Tractor View Post
I have zero regrets swapping out the rear ARB on mine. It adds that little more needed control. The car handles a lot better and is less tail happy. If you're into your curves, sweeping bends and, the odd sharp corner it is worth it. No deterioration of comfort. This is on my 435d X Drive.

Thanks for the replies. Though these two seem a touch contradictory?
Tengo saying the front end weight needs addressing so I'm reading it reduces understeer and Chelsea suggesting it prevents oversteer?
Or am I over thinking this and what it does is help reduce both over and understeer with 335d or 435d?
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      07-07-2019, 03:26 AM   #10
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Quote:
Originally Posted by flashollie View Post
Quote:
Originally Posted by Tengocity View Post
I tried big thick birds ARBs, and they were too stiff for the F30 in my opinion, so went back to OEM ones when i fitted coilovers, but went to the 15mm rear one, and I think it worked a treat. The Diesel engines cars are pretty nose heavy and this really nicely helped the front to rear balance. Would be an ideal mod to finish off a car on good suspension.
Quote:
Originally Posted by Chelsea_Tractor View Post
I have zero regrets swapping out the rear ARB on mine. It adds that little more needed control. The car handles a lot better and is less tail happy. If you're into your curves, sweeping bends and, the odd sharp corner it is worth it. No deterioration of comfort. This is on my 435d X Drive.

Thanks for the replies. Though these two seem a touch contradictory?
Tengo saying the front end weight needs addressing so I'm reading it reduces understeer and Chelsea suggesting it prevents oversteer?
Or am I over thinking this and what it does is help reduce both over and understeer with 335d or 435d?
I don't think oversteer is ever an issue I've ever had with my 335d! Understeer was a constant bugbear till I changed suspension and ARBs.
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      07-07-2019, 03:29 AM   #11
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I'd agree it's not something I've felt very often. Certainly that it doesn't cause a problem.
Though I did manage it rather well in an empty snow covered carpark.
Does the 15 mm ARB reduce what oversteer potential there is?
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      07-07-2019, 03:55 AM   #12
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Quote:
Originally Posted by flashollie View Post
I'd agree it's not something I've felt very often. Certainly that it doesn't cause a problem.
Though I did manage it rather well in an empty snow covered carpark.
Does the 15 mm ARB reduce what oversteer potential there is?
You only get it when you're in very low grip situations or extreme throttle applications, rather than as a general handling characteristic, so no, I wouldn't say the ARB would stop those if you want them. It's really an overall natural improvement in the balance of the car.
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      07-07-2019, 04:27 AM   #13
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Quote:
Originally Posted by Tengocity View Post
Quote:
Originally Posted by flashollie View Post
I'd agree it's not something I've felt very often. Certainly that it doesn't cause a problem.
Though I did manage it rather well in an empty snow covered carpark.
Does the 15 mm ARB reduce what oversteer potential there is?
You only get it when you're in very low grip situations or extreme throttle applications, rather than as a general handling characteristic, so no, I wouldn't say the ARB would stop those if you want them. It's really an overall natural improvement in the balance of the car.
Thanks that my experience - tail action only when driving in low grip or like car that has been stolen.
Improving the balance is a nice way to think about it. I'll look to get this done.
eBay for an ARB then.
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      07-07-2019, 04:42 AM   #14
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What are the bushes of choice for this mod? OEM ones or something like power flex?
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      07-07-2019, 05:02 AM   #15
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Quote:
Originally Posted by flashollie View Post
What are the bushes of choice for this mod? OEM ones or something like power flex?
I'd stick with OEM. They don't make any noise and it's a subtle modification where the bar itself makes the difference.
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      07-07-2019, 05:08 AM   #16
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Yeah, it's understeer that is the issue … I drove my sons new 430d s drive recently & whilst I appreciate rwd steering characteristics will be different, it highlighted the lack of balance that I feel at moderate speed on certain corners.
My main issue is that I could live with it if the remedy detracted from the overall comfort that I have at present.
Really appreciate all the feedback everyone.
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      07-11-2019, 01:38 AM   #17
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I've been trawling the internet for a second hand OEM 15mm ARB off a 135 or 140i with no joy.
Any ideas where I can find one?
If not what is the BMW part number?
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      07-11-2019, 06:01 AM   #18
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Quote:
Originally Posted by flashollie View Post
I've been trawling the internet for a second hand OEM 15mm ARB off a 135 or 140i with no joy.
Any ideas where I can find one?
If not what is the BMW part number?
I'm sure there's a thread or two on here with that info. Try the search or REALOEM.
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