08-11-2017, 07:24 AM | #45 |
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In the 3 and 4-series, you have "base" suspension, M-Sport suspension, and the Dynamic Handling/M-Adaptive suspension. All are available in both model lines. My 2013 335i M-Sport sedan has the DHP/Adaptive M suspension, and when in Sport or Sport+ modes, it's much stiffer than it is in Comfort mode. The stiffer suspension option for the 3-series may come standard in the non-base 4-series, but they all have the same basic components. It all depends on what options you have in the car and what mode you're driving in.
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08-11-2017, 08:06 AM | #46 | |
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08-11-2017, 01:03 PM | #47 | |
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08-11-2017, 06:24 PM | #48 | |
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yes i agree they do have the same basic component but for some reason, there is a very noticeable difference. I think no one would really know why, except BMW themselves. |
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08-11-2017, 06:30 PM | #49 | |
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I think this is not exclusive to 4 series. I know C class coupe drives somewhat differently than sedan as well... and G37/Q60 Coupe vs Q50/G37 sedan. I thought 4 series suspension was too stiff after having it for a while....it turned out that runflat really messed up the ride. Now 4 series with proper summer tires = stiff without being too stiff because of the runflat. When i had my F30 and change from RFT to summer, the car handled much better but it also felt even softer than with RFT at the same time because of the sidewall. |
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08-12-2017, 08:15 AM | #50 |
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With more than 50 years of driving under my belt, including competition and high-speed driving schools, I can clearly tell the difference between different models of the same chassis. How about somebody check out the suspension part numbers between simiar models of 3- and 4-series (340i vs. 440i or 335i vs. 435i) cars with the same options? Springs, shocks, sway bars, bushings, control arms, etc. If they're different, then that's a whole 'nother story. But 2 body styles sitting on the same chassis with the same suspension options, tires, and driving-mode settings with one feeling "stiffer" than another just doesn't add up.
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08-15-2017, 11:39 AM | #51 | |
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4 and 3 have different - shocks - front & rear subframes - rear knuckles (or hub- don't know that part exact name on English) Last two make the track (axle) 14mm wider. Rear sway bars of both 4 and 3 are equal 12mm with standard suspension. 3 has 13mm with M-Technik, 4 has 14mm with 14mm M-Technik. Front sway bars are equal- 24mm standard and 24,2mm M-Technik. Also 4 has the reinforcement V-bar under the bottom. All the control arms & bushings are equal. That's all the differences- seems nothing dramatic, but as a bit experienced drivers know the different settings of springs and shocks can transform a car you cannot recognize it if driving blind. For now having added the bits in the signature I've finally got a true BMW feel. (Will also risk to install M135i front and rear sway bars this week!) 430i vs 330i (LCI): Shocks are new to Pre-LCI on both 4 and 3. Rear subframes- unchanged. 4 rear sway bars are now same 12mm for standard, 14mm (former M-Technik) for Adaptive, 15mm for M-Technik 3 rear sway bars options are unchanged. 4 front sway bar M-Technik is 25mm, while 3 has 24,6mm M-Technik. Standard ones are equal for 4 and 3- no data on thickness, but seems 24mm as on Pre-LCI. Again- all control arms & bushings are equal on 4 and 3- only the front axle is wider by 14mm and rear axle- by 22mm on 4 Pre-LCI. LCI 4 and 3 have equal front axle, rear is just 6mm wider on 4. That's all, folks!)
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars Last edited by Dmitry83; 08-15-2017 at 12:22 PM.. |
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08-16-2017, 07:23 PM | #52 |
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Wait, the 4 series have the side vents....thats why it has better handling
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08-17-2017, 12:46 AM | #53 |
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The 4 series has a wider track and a stiffer body. BMW reinforced the 4 series body to be more sports car like so even if you mount the same suspension on a 4 series it would handle better since the suspension is only as good as the body it is mounted on. That said BMW most likely take the suspension in addition to the chassis of the car.
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08-17-2017, 01:11 PM | #54 | |
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08-17-2017, 05:31 PM | #55 | |
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Just the good shocks and springs transform the 3 you will not recognize it is the same car blindfolded. Also 4 has the V-bar under the bottom, 2mm thicker rear sway bar, and stiffer settings of shocks and springs. These little cheats make it much better handling with no surprise due to extreme chassis sensibility. So I think the 3 is made this grandma's handling feel on purpose- to make people want a F80 soon after F30. At the same time the chassis balance and potential is brilliant- again just try one nice tuned F30- you'll be amazed. The even better opinions on M3 handling compared to M4 also give some things to consider on.
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
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08-17-2017, 05:35 PM | #56 | |
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For many years I try to buy only sport-adjusted BMW models. This time with F30 I had to take the very-very fresh example with M-Sport package for a good price, which had a standard suspension, that I had to replace completely with M-Technik + few additions. Now it is a true BMW as I used to feel these cars.
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
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08-17-2017, 06:22 PM | #57 | |
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08-18-2017, 01:41 AM | #58 |
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08-18-2017, 05:00 AM | #59 |
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Exactly.
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
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08-18-2017, 04:18 PM | #60 |
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08-21-2017, 05:08 AM | #61 |
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Never driven an X-Drive 335 or 435ii, so can't tell- sorry.
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
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08-22-2017, 07:16 PM | #62 |
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Further confirmation of the differences in suspension. If you look at the 4-series sticky above under the suspension section:
Chassis / Suspension / Brakes / Wheels Springs and dampening, axle kinematics and elastokinematics tailored for 4 Series (although chassis construction based on F30 3 Series) Modifications to camber angle, the track and the roll center (0.7 inch lower than 3 Series Sedan) Particular attention paid to strengthening front section of the car Additional strut between front axle subframe and body sill Lightweight aluminum torque struts, wishbones, swivel bearings |
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08-23-2017, 06:06 AM | #63 | |
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Swivel bearings are different to increase the track by 14mm (rears are also different for the same reason). But what is meant by "Lightweight aluminum torque struts, wishbones"? All suspension elements (besides front subframe, shocks and springs) are totally equal for F30 and F32.
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'13 F30 320i (328i ECU) RWD M-Sport
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08-23-2017, 05:56 PM | #65 |
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My 2015 4GC has much better handling than my pre-LCI 3. It also has 5 bolt mountings for the front shocks as opposed to 3-bolt on my 3. Even if all components were similar a wider, lower car with better weight distribution is bound to handle better.
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