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12-23-2011, 11:26 AM | #1 |
Pablo
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Dinan Suspension Install with M3 components
After driving my 135 N54 for two years, I finally moved forward with a suspension modification. Previous modifications include the BMW performance power kit (V2 with radiator) and BMW performance exhaust. I recently switched out the runflats for Michelin PSS. I also replaced the PE midpipe (no resonator Y-pipe) with a N55 midpipe (with resonator).
I originally considered the BMW performance suspension kit, but wanted the M3 sway bar and better shocks. For $200 more than the performance suspension kit I was able to put together the following system from Scott at BMW of Houston:
Another thing that factored into my decision was warranty. Dinan has a lifetime warranty on their components. If a shock fails, a Dinan dealer will not only replace the part but the necessary labor is also included. This presumes the parts were installed properly, but you don’t have to have a Dinan dealer do the install. A comparable warranty on the BMW performance system would require a dealer install (with associated ridiculous labor costs). From Dan at United BMW I purchased:
From Harold at HPA I got:
From a forum member I purchased:
Brad at Bavarian X did a super clean and efficient job with the install. Darin and Chris at West End Alignment did a great job as well. The car now handles like it should have when it left the factory. The car is more planted, the ride has firmed up, but is still compliant. The sloppiness in the steering is gone thanks to the stiffer bushings in the M3 bits. I would have never attempted this without the great information on the forum and specific advise I received from other forums members. Thanks to Harold, 1fastbmw, fboutlaw, 135inc, timhatiway, mastamind and dackelone! |
12-23-2011, 10:32 PM | #3 |
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Very nice.
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12-24-2011, 07:44 AM | #7 |
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Nice set up. What size wheels and tires do you have? Any rubbing issues?
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2009 BMW LeMans Blue 135i/Dinan Stage 2 tune/Alufelgen SF-71s/M3 suspension components/Koni Sport adjustable dampers/ETS FMIC/M3 paddle shifters/Alpina B3 TCU flash/VRSF charge pipe
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12-24-2011, 12:11 PM | #8 | |
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To finally answer your question, I have noticed that I have "contact" during one specific circumstance, but I don't think this is "rubbing" in the conventional sense where the tires are too big. Everything that I have read indicates that PSS in these sizes work even with lowering. When turning left and at speed and I go over a V-gutter and the suspension gets a significant jolt, something makes contact when the suspension compresses. The car was examined and there appeared to be a minor rub mark on the front control arm where the tire/wheel may be making contact in the circumstance described. There isn't much clearance between all these components and the combination of the lowering of the springs and the geometry of the M3 parts being slightly different from stock may be the reason. So it's something I am going to have to keep an eye on and try to resolve. |
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12-24-2011, 02:13 PM | #9 |
OG Tray Deee
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Excellent Post Pablito!
Besides actually lowering the car by using springs and shocks, what would be the single greatest upgrade one can do to the suspension? Based on my understanding it would be: 1- 28 mm M3 Front Sway Bar 2- ? 3- ? I am interested in the M3 Front Control Arms and M3 Front Tension Struts, but I know so little information about them... I have the PSSs already installed on the stock 264 rims and they are amazing, but I also see where you say the tires "emphasize the deficiencies of the stock suspension" b/c I have noticed it. Basically, im looking for a slight suspension upgrade that would complement the power and would return a comfortable and rewarding experience. Thanks for the input |
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12-24-2011, 03:22 PM | #10 | |
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Other forum members had advised me to take an incremental suspension mod approach and this might work well for you. After driving the car just with the PSS, I would consider doing just the M3 parts (incl. sway) and see how the car feels. A lot of the things I didn't like about the car's handling seemed to be resolved from these parts, but since they were installed at the same time as the springs/shocks I didn't really get chance to evaluate independently. With regards to the sway bar, do some research before choosing, as the stiffness in the bar needs to be matched to the springs (stiffer springs work better with a less stiff sway). I chose a 26.5 mm M3 bar because, according to Dinan, that was the correct match for the springs. I was actually suprised at the similarity of my stock bar and the M3 bar, the clear difference was in the bushings. |
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12-24-2011, 04:20 PM | #11 | |
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1- Koni FSD shocks 2. e92 M3 Front Sway Bar and then if you still want more: 3. M3 Front Tension Rods 4. M3 rear subframe bushings |
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12-26-2011, 10:27 AM | #13 | |
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1. 28mm M3 sway bar, bushings and brackets 2. M3 control arms and tension rods. 3. Shocks, shocks/springs or coliovers After the wheels and tires I added an E93 M3 28mm sway bar, bushings and brackets. The M3 sway bar makes a huge difference in controlling body roll. Personally I like the 28mm bar over the 26.5mm E92 M3 sway bar, especially if you are not going to an agressive suspension mod. Next I added the M3 control arms and tension rods. Those in combination with the M3 sway bar really make the car feel much better. However, they also magnify the issues with the rest of the OEM suspesion. It has way to much squat and dive in if for me. Now I'm trying to decide whether to go with aftermarket 1) struts/shocks, 2) springs and struts/shocks or 3) coilovers. I really don't want to lower my car because I like the stance with the SF-71s and I've had some rubbing issues with them in the back with more than one person in the car. Recently I had my fenders rolled in hopes of doing away with any more rubbing issues. So far so good. Since I haven't been able to find any aftermarket springs that don't lower the car I'm leaning toward adding Koni Sport struts and shocks (with external adjustability). The adjustability of the Koni's can hopefully help reduce the squat and dive without chaning the springs and without making the ride very harsh. You may want to try springs like the BMW performace springs that only lower the car 10mm. Those with Koni Sports should make for a nice set up along with the M3 pieces.
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12-26-2011, 09:30 PM | #14 |
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Nice looking set up Pablito
Where'd you set the rebound damping on the Koni's?
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12-26-2011, 11:09 PM | #15 |
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You and I are pretty much running the same suspension now! The contact issue shouldn't be rubbing with a 225 up front. Check the plastic joint between the bumper and the front quarter and see if there's wear. To be safe, you may want to remove the screw and the clip to eliminate metal to rubber contact.
Also, how'd you set your torques? Just got the Bentley manual for 3 series for xmas! So I'm welcoming questions. Suspension torques in the book are higher than I set them, so beware. |
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12-27-2011, 11:07 AM | #16 | |
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I will look at out what you're referring to at the bumper seam, but the sound that I am hearing is a defined metallic "clank" when I hit a sharp bump (typically drainge V-gutter) when the wheel is turned and the suspension compresses suddenly. Your recommendations regarding Dinan suspension were spot on. I am driving presently on Dinan pre-set koni settings, which seem to be good except for the worst condition roads. I may experiement with softening up the fronts shocks since the M3 strut brace has made that operation very easy. |
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12-27-2011, 11:26 AM | #17 |
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Could it be your installer mounted the front sway bar upside down? It is a common mistake when installing the FSB and can cause a sharp metalic noise like you described.
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12-27-2011, 09:23 PM | #18 |
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Thanks for your suggestion David, but the installer is a pro and I don't see how that could happen given how similar the OEM and M3 bars are. The way the bar has to get around the other components, it seems like there would be only one possible way to install. But something is touching something so I am going to take it easy under the specific circumstances when I experience the clank until I have it figured out.
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01-06-2012, 08:55 PM | #20 |
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Congrats on the suspension, hope you get the noise figured out soon, I know things like that can drive you nuts. Still very happy with my complete setup and the FSD's but very curious how these feel in comparison.
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01-10-2012, 05:08 PM | #21 |
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Nice and clean install!
This will make a very nice daily driver and still enough performance for some HPDE or light track days. |
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