Upgrading 135is Rear Bushings / Front Control Arms - Suggestions Needed

[HP Autosport]

Originally Posted by John_01

ST coilovers have unusual spring rates where the rear spring rate is too soft relative to the front. It may have been a deliberate design compromise to accept the stock rear subframe bushings, which may not tolerate higher rear spring rates.

KW V2 would be a better choice from a performance point of view, but I'm concerned it may not ride as well as some of the possible combos using the BMW performance springs. Also if you go for Koni or KW style adjustable dampers you will have trouble to access the top adjust points due to the position of the stock strut reinforcement bar. It will also prevent the installation of the dust caps for the front strut bearings. 1M coupe strut reinforcement bar is a good solution to solve these issues, but costs some $.

Ohlins R&T is the same way.

[mjack]

Originally Posted by Suprgnat

I'm talking about the rear toe arms. That said, I think it's an extremely well designed rear suspension. It's basically a sophisticated double a-arm with toe compensation. The closer one can keep it to "ideal" specification is the key to precise handling and the trade-offs have been well discussed. fe1rx has researched this at length (and designed some gorgeous ///M inspired toe arms).

My take aways from all of this:

I have M wishbones, guide rods, camber arms, and Rogue toe arms. I'll take the combined weight savings of all the ///M rear components and they're a minor upgrade to overall stiffness and bushing compliance. I like the way they behave as as system, but have no objective data to back that up. ISTG, every time I limit bushing compliance my car gets more fun to drive. It's a curse. I swore I wouldn't do it this time.

Really appreciate these tips. So I just ordered the M toe arms as you suggested because FCP euro has them on a clearance sale for $51 each right now, part #33322283549. I'm hoping they fit fine like the front ones do.

Do you suggest I buy this kit to finish off the rear? https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

[135ivert]

Originally Posted by jack135is

Really appreciate these tips. So I just ordered the M toe arms as you suggested because FCP euro has them on a clearance sale for $51 each right now, part #33322283549. I'm hoping they fit fine like the front ones do.

Do you suggest I buy this kit to finish off the rear? [url]

Looks right. You probably need new bolts to replace the one-use ones.

[mjack]

Originally Posted by 135ivert

Looks right. You probably need new bolts to replace the one-use ones.

Good call. Just ordered those too

[fe1rx]

Originally Posted by jack135is

Really appreciate these tips. So I just ordered the M toe arms as you suggested because FCP euro has them on a clearance sale for $51 each right now, part #33322283549. I'm hoping they fit fine like the front ones do.

Do you suggest I buy this kit to finish off the rear? https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

The M toe arms do not fit the 1-series because the length is different.

[Suprgnat]

Originally Posted by jack135is

Really appreciate these tips. So I just ordered the M toe arms as you suggested because FCP euro has them on a clearance sale for $51 each right now, part #33322283549. I'm hoping they fit fine like the front ones do.

Do you suggest I buy this kit to finish off the rear? https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

I did Rogue rear toe arms, not the ///M arms which, as fe1rx has stated, do not work with the non-///M rear subframe.

[mjack]

Originally Posted by Suprgnat

I did Rogue rear toe arms, not the ///M arms which, as fe1rx has stated, do not work with the non-///M rear subframe.

Originally Posted by fe1rx

The M toe arms do not fit the 1-series because the length is different.

Thanks guys, looks like I will be refusing that shipment for a refund .

Been looking around at options for the rear end... what is your opinions on this set? http://www.ebay.com/itm/381336619858

I've read that these are made in the same facility as Megan racing, just much cheaper... Also wondering what bolts I will need to buy if installing these.

[135ivert]

My apologies for the confusion - I got my rear suspension part names mixed up. This is the kit I went with. It does not contain toe arms.

[mjack]

Originally Posted by 135ivert

My apologies for the confusion - I got my rear suspension part names mixed up. This is the kit I went with. It does not contain toe arms.

No worries. I was able to get a return to sender done so no harm no foul