[Fundguy1]

Ok I've been getting bits and pieces from different threads but never seen a complete list in one spot. My car has 200,000 miles. I'm redoing it with a complete set of FBO, turbos, suspension, brakes, etc. in the process I want to replace all the various bushings and get it tightened up again. So far I am replacing:
Subframe bushings with AKG black bushings
Motor and trans age getting new OEM mounts
I'm replacing coilovers with KW v2. I'm guessing they come with all new necessary shock mounts etc for refresh.

What other bushings need replacing? differential? Front Control arm? read control arm? Rear upper link? Rear guide rod? Sway bar?
Would replacing bushings in some of these locations be so expensive that I may as well replace the part with M3/TRW verions with the bushings installed? Not really interested in replacing sway bars if I'm not going to get better cornering grip, but the rest maybe if it makes sense. I am interested in a shock tower brace, maybe M3 also. Any other locations I need to address? Any of these not need replacing? Where's my suspension gurus?


Oh and the general idea is to get it to handle as well or better than an M3 version of my car.

[Fundguy1]

62 views and nothing yet?

[Seanzie]

I'm assuming you are referring to the rear subframe bushings where you'll use the AKG black bushings, right?

I'd recommend the differential mounting bushings since higher power levels will wear those down. Also get the M3 front control arms, which come with new bushings & are lighter (aluminum) and give about -0.7 degrees camber.

The strut mounts and the bump stops on your suspension should be fine if you don't expose them to snow & the associated crap they put on the roads. The integrity of the bump stops are easily verified when you have your wheel off. I live in Houston, and due to the mild weather conditions, I didn't need to change them out.

This being said, I honestly don't think that you'll get to equal/better handling than the M3 without substantial investment, but if that's your aim, go for it! I'd consult with Harold @ hpashop if that's your goal.

[Fundguy1]

I've been making substantial investment. Well over $20,000 in upgrades so far. Rear wheel hp is going to be around 650. Figure lowering, same size but better tires, m3 or better components front to rear, should be doable. Harold is doing my wavetrac LSD. I'll talk to him about the other stuff too.

[justpete]

Originally Posted by Fundguy1

I've been making substantial investment. Well over $20,000 in upgrades so far. Rear wheel hp is going to be around 650. Figure lowering, same size but better tires, m3 or better components front to rear, should be doable. Harold is doing my wavetrac LSD. I'll talk to him about the other stuff too.

Two of the bushings that are the most heavily stressed by high torque output engines are the trailing arm and inner swingarm bushings. The former will cause toe out and heavy rear steer with this much horsepower, you'll need at an absolute minimum spherical bearings and likely new arms, they're not expensive. The inner swingarm bearing requires welding but it's worth it. The ride won't suffer as much as it could if more bearings were installed instead of bushings.

[Fundguy1]

Originally Posted by justpete

Two of the bushings that are the most heavily stressed by high torque output engines are the trailing arm and inner swingarm bushings. The former will cause toe out and heavy rear steer with this much horsepower, you'll need at an absolute minimum spherical bearings and likely new arms, they're not expensive. The inner swingarm bearing requires welding but it's worth it. The ride won't suffer as much as it could if more bearings were installed instead of bushings.

Where can I look at these? I looked at Turner and HP and couldn't find them.

[justpete]

Originally Posted by Fundguy1

Where can I look at these? I looked at Turner and HP and couldn't find them.

BimmerWorld has them.

[cvc 22349a]

KW don't come with shock mounts. You'll need those. Dinan or Powerflex rear upper mounts and oem rear lower mount. Might as well get new upper strut mounts too. Did you mention toe arms? Megan Racing seems to be the best bet. Possibly a differential lockdown kit with all that HP or at least firmer diff bushings.

[justpete]

FWIW, Turner has lower shock mounts for Heim joints -- http://www.turnermotorsport.com/p-20...m-e82-e9x.aspx

And AKG makes upper shock mounts as well.

[cvc 22349a]

^ Those won't work for non-M rear shocks. He's getting KW V2

[justpete]

Originally Posted by cvc 22349a

^ Those won't work for non-M rear shocks. He's getting KW V2

OK, thanks. The dampers on my car use them or something that looks a lot like them and the spring arm is stock. Turner's page says they'll work with an '08 335i E93.

[whinojosa]

Hey Pete, impressive list of mode there. Since we're in a bushings thread thought id throw in the question:

"How do you like the TMS Delrin\Aluminum rear subframe ("RS") bushings?"

I'm debating, I'm sure I'm not alone, with M3 upgraded, BMW Group N motorsports rubber, or the TMS Delrin. Also, did you DIY?

Thanks!

[justpete]

Originally Posted by whinojosa

Hey Pete, impressive list of mode there. Since we're in a bushings thread thought id throw in the question:

"How do you like the TMS Delrin\Aluminum rear subframe ("RS") bushings?"

I'm debating, I'm sure I'm not alone, with M3 upgraded, BMW Group N motorsports rubber, or the TMS Delrin. Also, did you DIY?

Thanks!

The Delrin bushings rock, no more wobble. At all. Couldn't tell you about NVH since they're the least of the problem there. Still, I wanted flat handling and they're part of the solution.

Didn't DIY, all the work was done by a local SCCA race team, part of the dealership I bought the car at. Since the subframe has to be removed you have to know how to index it which turns out to be an alignment of the rear subframe with the front subframe, apparently not a trivial exercise but they do it all the time so it wasn't a big deal for them. Wouldn't want to attempt that at all if the idea was to get the best rolling chassis setup possible. YMMV of course. Me, I've mucked up enough DIY along the way that I've found it less expensive to get it done right the first time.

[belcom]

ECS has refresh bushing suspension kits. I believe it includes a complete suspension rebuild kit.