Ohlins R&T

Freakystein · 10-18-2020, 01:05 AM

Hi Guys,

my f30 is on Ohlins R&T, 1 concern i have now is the cars is bouncy when crossing some undulation in the road surface. It feels as if the car would double bounce and if i encounter multiple undulation on the road surface, it's kinda uncomfortable at times especially in the freeways.

Any idea how can this be dialed out? I've been trying to soften the struts to the max for front & rear, but it does not help. Should i actually be stiffening it up either the rear or front?

Anyone encounter this and might be able to share what would be a better setup to counter this?

Logicoeur · 10-18-2020, 07:57 AM

It's pretty easy to adjust the firmness, so just try it first.

Watsey · 10-18-2020, 08:47 AM

R&T uses parallel adjustment for bump and rebound.

From what you've described, you have the dampers set too soft.

I run mine between 12 and 9 from full stiff, depending on my mood/preference.

FIDDYgg · 10-18-2020, 09:58 AM

I agree with Watsey, you need to dial in your compression and rebound damping.

I highly suggest studying and understanding these functions of suspension, simply thinking in terms of "stiff" and "soft" is not adequate to properly set things up.

In basic setup, you want compression damping set open enough so that the shock can absorb impacts using the majority of it's stroke without bottoming out but not so soft that it continues to bounce afterwards.

And you want rebound damping set closed enough so that it slows & controls the extension of the spring/shock after compression not causing it to pogo, but not so closed that the shock "packs up" over multiple impacts.

Logicoeur · 10-18-2020, 10:15 AM

Quote:

Originally Posted by FIDDYgg

I agree with Watsey, you need to dial in your compression and rebound damping.

I highly suggest studying and understanding these functions of suspension, simply thinking in terms of "stiff" and "soft" is not adequate to properly set things up.

In basic setup, you want compression damping set open enough so that the shock can absorb impacts using the majority of it's stroke without bottoming out but not so soft that it continues to bounce afterwards.

And you want rebound damping set closed enough so that it slows & controls the extension of the spring/shock after compression not causing it to pogo, but not so closed that the shock "packs up" over multiple impacts.

Ohlins aren't 2 way in th sense that rebound and dampening are independently adjustable. The knob on front and rear adjust both simultaneously or in parallel like watsey posts right above you.

FIDDYgg · 10-18-2020, 10:23 AM

Quote:

Originally Posted by Logicoeur

Ohlins aren't 2 way in th sense that rebound and dampening are independently adjustable. The knob on front and rear adjust both simultaneously or in parallel like watsey posts right above you.

I went and read up on the R&T after I commented, you are correct on that! My experience with Ohlins' bouncy parts is strictly in the superbike realm and they have all the clicky knobs. Preload, low & high speed compression, low & high speed rebound.

The Swedes know their stuff, they must have figured out a good ratio for comp and rebound so I guess you just have to find the sweet spot for your conditions

(Just remember that clicks are counted backwards from fully closed)

Watsey · 10-18-2020, 04:02 PM

@Freakystein also bear in mind that, as well as being parallel adjustable, the R&T have dual-flow valves.

These take the edge off secondary inputs which can cause a 'busy' ride, and allow you to focus more on controlling the suspension's response to the primary inputs i.e. run stiffer settings.

Freakystein · 10-18-2020, 10:13 PM

Hi guys, appreciate the feedback. I also suspected that the dampers might be set too soft, which causing the issue. I've stiffen up both the front n rear and see how it goes.

Btw, can we run slight stiffer rear to front or vice versa? Or do we need the front & rear to be the set at the same, E.g 10 clicks front & rear, or can i can do 10 clicks front, 7 clicks rear depending on my driving?

Logicoeur · 10-19-2020, 02:08 AM

Quote:

Originally Posted by Freakystein

Hi guys, appreciate the feedback. I also suspected that the dampers might be set too soft, which causing the issue. I've stiffen up both the front n rear and see how it goes.

Btw, can we run slight stiffer rear to front or vice versa? Or do we need the front & rear to be the set at the same, E.g 10 clicks front & rear, or can i can do 10 clicks front, 7 clicks rear depending on my driving?

They don't need to be set to the same stiffness.

Freakystein · 10-19-2020, 10:17 AM

Quote:

Originally Posted by Logicoeur

They don't need to be set to the same stiffness.

Got it. Means I have to find my own perfect setting then. Thanks!

FastF30 · 10-20-2020, 09:50 PM

Stiffening up the back will help the car oversteer... you want it soft enough that it doesn't skip over bumps but firm enough it doesn't pogo/ wallow over bumps... that's the best I found so far for info... I'll be putting this reasoning to test very soon... I'm going to start off with 1/2 front 5/8 rear adjustment... I have a staggered set-up...

Freakystein · 10-21-2020, 07:42 AM

Quote:

Originally Posted by FastF30

Stiffening up the back will help the car oversteer... you want it soft enough that it doesn't skip over bumps but firm enough it doesn't pogo/ wallow over bumps... that's the best I found so far for info... I'll be putting this reasoning to test very soon... I'm going to start off with 1/2 front 5/8 rear adjustment... I have a staggered set-up...

1/2 front 5/8 rear from fully close? that is gonna be stiff man...

Watsey · 10-21-2020, 08:32 AM

Quote:

Originally Posted by Freakystein

1/2 front 5/8 rear from fully close? that is gonna be stiff man...

Very stiff - I don't even run those settings on track.

FastF30 · 10-21-2020, 11:19 AM

Quote:

Originally Posted by Freakystein

1/2 front 5/8 rear from fully close? that is gonna be stiff man...

Quote:

Originally Posted by Watsey

Very stiff - I don't even run those settings on track.

Really... wow... never of thought it would be that stiff for any set-up... glad there are forums...

... I'm going to be installing Flatout-suspension SR ... basically a street setup... Then I'll start 1/4 front and 3/8 back starting from soft setting...

Logicoeur · 10-21-2020, 12:39 PM

Quote:

Originally Posted by FastF30

Quote:

Originally Posted by Freakystein

1/2 front 5/8 rear from fully close? that is gonna be stiff man...

Quote:

Originally Posted by Watsey

Very stiff - I don't even run those settings on track.

Really... wow... never of thought it would be that stiff for any set-up... glad there are forums...

... I'm going to be installing Flatout-suspension SR ... basically a street setup... Then I'll start 1/4 front and 3/8 back starting from soft setting...

A 2 on the ohlins will definitely be different than a 2 on the SR. Unless their dampening curves are exactly the same, which is unlikely.

FastF30 · 10-21-2020, 01:07 PM

Quote:

Originally Posted by Logicoeur

A 2 on the ohlins will definitely be different than a 2 on the SR. Unless their dampening curves are exactly the same, which is unlikely.

Yea... that's why I used 1/4 and 3/8 since all adjusting could be different.. I have 20 clicks of adjustment... so 5 front and 7 back I'll start off with from softest setting... That's with recommended tire pressure cold 32F/38R... we'll see how it goes.. the adjustment for the back is on the lower part of the shock... so easy to get to once your on your back...

Logicoeur · 10-21-2020, 01:09 PM

Quote:

Originally Posted by FastF30

Quote:

Originally Posted by Logicoeur

A 2 on the ohlins will definitely be different than a 2 on the SR. Unless their dampening curves are exactly the same, which is unlikely.

Yea... that's why I used 1/4 and 3/8 since all adjusting could be different.. I have 20 clicks of adjustment... so 5 front and 7 back I'll start off with from softest setting...

Cool. Following your experience. I plan to pick up the ST from them next month

Watsey · 10-21-2020, 02:47 PM

Quote:

Originally Posted by FastF30

Really... wow... never of thought it would be that stiff for any set-up... glad there are forums...

... I'm going to be installing Flatout-suspension SR ... basically a street setup... Then I'll start 1/4 front and 3/8 back starting from soft setting...

Well of course you can run the dampers on those settings but personally I find that a bit of compliance helps maintain the tyre contact patch. Having reasonably stiff ARBs obviously controls the roll, which means that the springs and dampers can be left to deal with undulations and grip/traction.

For R&T my normal road settings are between 9-12 front and rear - I find the car rides evenly F/R in that range, and 'lands' well on roads which have larger primary undulations.

Freakystein · 12-03-2020, 02:35 AM

Currently i've tried with a stiffer setting, 8/8 for F&R and wow, it seems that the Ohlins R&T like stiffer damping to accommodate for the high spring rate. The whole car felt much more neutral and although is stiffer, but is not crashy or bumpy. The DFV is doing its job.

10-18-2020, 01:05 AM	#1
Freakystein Enlisted Member 17 Rep 35 Posts Drives: F30 335i Join Date: Jun 2020 Location: Malaysia iTrader: (0)	Ohlins R&T - UNDULATING AND BOUNCING Hi Guys, my f30 is on Ohlins R&T, 1 concern i have now is the cars is bouncy when crossing some undulation in the road surface. It feels as if the car would double bounce and if i encounter multiple undulation on the road surface, it's kinda uncomfortable at times especially in the freeways. Any idea how can this be dialed out? I've been trying to soften the struts to the max for front & rear, but it does not help. Should i actually be stiffening it up either the rear or front? Anyone encounter this and might be able to share what would be a better setup to counter this?
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10-18-2020, 07:57 AM	#2
Logicoeur Lieutenant Colonel 991 Rep 1,934 Posts Drives: F30 335i xDrive Join Date: Feb 2018 Location: Boston iTrader: (0)	It's pretty easy to adjust the firmness, so just try it first. __________________ F30 335iX \| Remus Axleback \| Fabspeed Catted DP \| VRSF Comp IC \| 18X9 ET35 19lb MT1 \| 255/40/18 ECS \| Ohlins RT Millway Street \| Millway Control Arm Bushings \| Turner Endlinks \| TMH 75mm 14x1.5 Studs \| BMW MPerf LSD \| XDelete \| Pipercross Filter \| MHD Stg2 93
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10-18-2020, 08:47 AM	#3
Watsey Major General 6404 Rep 8,493 Posts Drives: F31 330D sDrive M Sport Join Date: Jun 2015 Location: On sabbatical. iTrader: (1)	R&T uses parallel adjustment for bump and rebound. From what you've described, you have the dampers set too soft. I run mine between 12 and 9 from full stiff, depending on my mood/preference. __________________ Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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10-18-2020, 09:58 AM	#4
FIDDYgg Private 27 Rep 55 Posts Drives: 2018 340i X-Drive Join Date: Aug 2019 Location: Canada iTrader: (0)	I agree with Watsey, you need to dial in your compression and rebound damping. I highly suggest studying and understanding these functions of suspension, simply thinking in terms of "stiff" and "soft" is not adequate to properly set things up. In basic setup, you want compression damping set open enough so that the shock can absorb impacts using the majority of it's stroke without bottoming out but not so soft that it continues to bounce afterwards. And you want rebound damping set closed enough so that it slows & controls the extension of the spring/shock after compression not causing it to pogo, but not so closed that the shock "packs up" over multiple impacts. __________________ 2018 340i X-Drive \| M-Sport \| MPPSK \| Dinan Intake
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10-18-2020, 04:02 PM	#7
Watsey Major General 6404 Rep 8,493 Posts Drives: F31 330D sDrive M Sport Join Date: Jun 2015 Location: On sabbatical. iTrader: (1)	@Freakystein also bear in mind that, as well as being parallel adjustable, the R&T have dual-flow valves. These take the edge off secondary inputs which can cause a 'busy' ride, and allow you to focus more on controlling the suspension's response to the primary inputs i.e. run stiffer settings. __________________ Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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10-18-2020, 10:13 PM	#8
Freakystein Enlisted Member 17 Rep 35 Posts Drives: F30 335i Join Date: Jun 2020 Location: Malaysia iTrader: (0)	Hi guys, appreciate the feedback. I also suspected that the dampers might be set too soft, which causing the issue. I've stiffen up both the front n rear and see how it goes. Btw, can we run slight stiffer rear to front or vice versa? Or do we need the front & rear to be the set at the same, E.g 10 clicks front & rear, or can i can do 10 clicks front, 7 clicks rear depending on my driving?
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10-20-2020, 09:50 PM	#11
FastF30 Lieutenant Colonel 521 Rep 1,288 Posts Drives: 2015 335i xdrive Msport Mbrake Join Date: Dec 2017 Location: Middle of the Road iTrader: (0) Garage List 2015 BMW 335i Xdrive [0.00]	Stiffening up the back will help the car oversteer... you want it soft enough that it doesn't skip over bumps but firm enough it doesn't pogo/ wallow over bumps... that's the best I found so far for info... I'll be putting this reasoning to test very soon... I'm going to start off with 1/2 front 5/8 rear adjustment... I have a staggered set-up... Last edited by FastF30; 10-20-2020 at 11:32 PM..
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12-03-2020, 02:35 AM	#19
Freakystein Enlisted Member 17 Rep 35 Posts Drives: F30 335i Join Date: Jun 2020 Location: Malaysia iTrader: (0)	Currently i've tried with a stiffer setting, 8/8 for F&R and wow, it seems that the Ohlins R&T like stiffer damping to accommodate for the high spring rate. The whole car felt much more neutral and although is stiffer, but is not crashy or bumpy. The DFV is doing its job.
	Appreciate 0 Quote