[acerboo]

has anyone fitted eibach anti roll bars to a 335d? are they worth fitting what is the cost to fit

[dxb335d]

think tony (e92fan) has fitted them to his 335i.

[E92Fan]

Originally Posted by acerboo

has anyone fitted eibach anti roll bars to a 335d? are they worth fitting what is the cost to fit

I have fitted the Hartge rollbars to my car, as opposed to the Eibachs. However I believe the dimensions of the two brands are fairly similar...

In terms of performance, the rollbars for me are the single greatest improvement you can make to the cornering ability of the car. You retain the suppleness and relative comfort of the standard suspension but without the roll and pitch of the standard car. The handling balance is also altered - whereas the standard car is designed to understeer when pushing on, the uprated roll bars change the handling balance to a much more neutral and progressive setup - you really can steer the car on the throttle. Initial turn-in is a lot sharper, and you don't have to wait for the car to settle on the springs before pushing on through a fast corner. It really is night and day different.

HOWEVER...

In order to get the most out of the car with uprated rollbars, you really should consider adding an LSD to the back end. The reason is this - with the uprated rollbars, you can (though not always) lose a little bit of traction at the rear end because it is so much stiffer laterally. The LSD helps to redress the balance (if any is needed).

Kevin Bird is the importer of the Hartge equipment, and the retail price of the Hartge roll bars is £820 inc VAT and fitting, although I know he will do some sort of a discount (perhaps 5-10% on the parts) to E90post members if they say that I've sent them along! Fitting takes a good few hours, as the rear subframe needs to be lowered and is quite tricky to do properly.

Contact him here - www.birdsauto.com or 01753 657444


And see here - HERE - for my review of the Hartge antiroll bars when I had them installed over a year ago...

[marriedblonde]

Spin's got the Eibach kit fitted to his I believe.

J.

[acerboo]

thanks for the advice

[Ant397]

We have the Eibach Anti Roll bars on our demo cars and are really happy with them, exactly as Tony says, a marked improvement especially on the motorway at higher speeds, the car feels much more stable.

We also fitted them to Spins car... prices can be found in our shop if your interested.


ant.

[acerboo]

thanks ant but just too late had some delivered today same price though

[Ant397]

Originally Posted by acerboo

thanks ant but just too late had some delivered today same price though

No problem mate, you will be more than happy with them!

Let us all know your feedback when you have them fitted and remember to lower the rear subframe to do the rear one...



ant.

[CD]

Originally Posted by acerboo

has anyone fitted eibach anti roll bars to a 335d? are they worth fitting what is the cost to fit

yes i have and sorry i cant remember

[acerboo]

i notice the eibach bars are 15mm rear and 28mm front whereas the standard ones are 13mm and 26.5mm that is hardly any difference. the hartge ones are 20mm and 28mm which is a substantial difference. will the eibach rear be noticeable? any views?

[Serjames]

I'm running hartge gear with the LSD and they are an awsome combo !

SJ

[Serjames]

I'm running hartge gear with the LSD and they are an awsome combo !

SJ

[E92Fan]

Changing from stock to the Eibachs will be a MASSIVE difference. Even if the difference is nominally small, the actual difference in rollbar stiffness is of magnitudes greater because the stiffness of a rollbar is based on the FOURTH power of its diameter...

So for instance, going from 26mm to 26.5mm will give you a 7.9% increase in stiffness, all other things being equal.



In your application of the Eibach rollbars the following will apply, assuming the basic design of the rollbars are the same as stock (with the same lever arm dimensions, material stiffness, geometric points etc) -


The increase of 1.5mm in rollbar diameter (from 26.5mm to 28mm) for the front will give you a 24.6% increase in stiffness.

The increase of 2mm for the rear (from 13mm to 15mm) will give you a 77.25% increase in stiffness.




In practice, because the percentage increase for the Eibach rear bars is much greater than for the front, the car will will have a proportionally stiffer rear roll setup, which leads to LESS understeer than stock.

The Hartge bars give an even greater percentage increase in rear roll stiffness in theory and IMO makes the car very well balanced as pretty much all understeer is now gone. For me it's a very good balance with the Hartge bars as I like a car which is pointy with pin-sharp turn-in and throttle adjustability. The LSD helps me in this regard. The Eibachs will go most of the way to replicating this feel, but I think will retain a degree more of understeer so that the car is within the handling limits of 95% of drivers.

[acerboo]

thanks for the explanation i cant wait to get them on the car. will report on the result but may be a while before i have the time to get them on.

[acerboo]

help needed have fitted the front arb but not sure about the rear. can anyone help please. does the rear sub frame have to be completely detached or just loosened. do the brake pipes and or prop shaft / exhaust have to be detatched. anything else to consider. torque valuesetc. very grateful for any help.

[E92Fan]

The exhaust definitely needs coming off, and the rear subframe needs to be dropped, though it doesn't have to be removed completely... You just need to support it from underneath. I can't remember exactly whether the prop shaft needs to be removed - from memory I don't think we did, but can't be sure...

[acerboo]

thanks again

[Ant397]

Exhaust definately yes.

Prop no - it will stabilise the axle carrier as you lower it down.

It is far easier to support the axle carrier under the diff, undo all 4 torks bolts and then lower the carrier down slowly.

Just keep an eye on the 2 brake lines that go from chassis to axle carrier on the passenger side rear... there is only so much they will allow and please dont damage them!

You will find that the axle is very well balanced and shouldnt need any support at the sides, but just take everything slow and methodical and you shouldnt have any problems.

Full praise for having a go yourself though!

Once you have done a few, you get the hang of it... we charge just 2 hours to do the whole job, from driving the car in to finishing the test drive.

Cant advise you of the torque settings for the tork bolts as Im not at work for once... different models have different spec bolts and torque values. If you can wait until Monday, pm me your chassis/VINnumber and ill have a look on the system and let you know.


ant.

[acerboo]

just like to say a big THANKS to Ant for his help. Top man.

[Spin]

This has to be one of the best modifications you can do on your BMW and very cost effective.

My 335D was done back in August and the handling is so much more secure with less understeer, the car feels planted even on its 19" RFT's.

I'm just about to have the same modification done by Speed religion on the 130i.

Ant at speed religion is a top guy with very reasonable labour rates so if not as brave as Acerboo (well done !!) I'd suggest giving him a call, I drop my car off and take the wife into the trafford centre for some retail therapy so we both get something out of taking time out on a Saturday and more importantly I don't get any negative noise about what I'm spending on the cars

[1 AKY]

Hi All

Is the ride comfort (if such a thing exists with the M-Sport suspension and RFTs ) sacrificed at all?

I'm contemplating this mod but have to remember that I have 2 kids (15months and 1 month respectively at the moment) who'll be sat in the car with me, even though most of the mileage will be up and down the motorway.

Advice, opinions and above all your experiences welcome.

Thanks - Aky

[E92Fan]

Have a look at my review of the Hartge rollbars which will give you an idea of what the upgrade feels like (although it's not Eibach, the principles and effect is the same) Certainly the ride hasn't be detrimentally affected to any noticeable degree. Link to the review is in my sig below