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M3 on 328i
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12-05-2011, 11:48 PM | #67 |
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New Tires
I installed new tires a few days ago, and all the vibrations and rattles are gone. All the harshness at low speed is gone too. In terms of harshness, the ride is perfect now.
I still have a bouncy rear though. The rear suspension resonates up and down about 3 times per second over certain roads with certain bump combinations, at 30-40 mph. I can elicit the rear end bounce at really low speed, so I'm going to try to track it down. The tires I got are ExtremeContact DW. So far I have only 200 miles on them, and they are extraordinarily squirrely. They are worse than squishy, they are unsafe, because they allow the rear end to start fishtailing after minor direction changes at 65 mph! Simply unbelievable. Well I tried to keep my mouth shut until 500 miles, but there you go. I'll edit this if they change.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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12-06-2011, 10:12 AM | #68 |
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^They're supposed to be good tires. Give 'em at least 500 miles and experiment w/pressures.
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
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12-06-2011, 10:26 AM | #69 | |
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Like cvc said, the only tool you have now is tire pressure. The DW's are a highly-rated tire.
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328i Sports Pkg, Michelin PSS on Staggered 18" OZ Ultraleggeras
. BMS Powerbox. Cyba scoops + Rev motoring intake hose + charcoal delete. Wavetrac LSD . M3: subframe bushings + sways + control arms (fr & rr). Meyle rear toe arms. M3 diff fr bushings . BMW Perf: v2 springs + v1 dampers. Valeo SMFW+clutch. 034 MotorSport engine mounts . Short Shifter + Turner PU bearing + ZHP M weighted shift knob. CDV delete |
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12-06-2011, 12:42 PM | #70 | |
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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12-06-2011, 12:51 PM | #71 |
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The conti ExtremeContact DWs are known to be a very soft tire. I tested these back to back vs the Michelin pilot Super Sports at an event earlier this year (on an E92 328i), and the difference was significant. That experience was a determining factor when I picked out new tires a few months later, and crossed the DW's off my list.
I know it doesn't help you now, but since you are stuck with them, I'd put a few more PSI in them, to help stiffen them up. What tire pressures are you running right now? |
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12-06-2011, 12:56 PM | #72 |
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By the way, when I said fishtailing, I mean the sidewalls actually oscillate in the rear. If I make a medium-fast "lane change" maneuver, the rear squishes one way, then the other way, then returns to center. I hate to complain, but... that's not "max performance"...
I agree on the mileage and the pressures. I've tried 37 and 40 so far, I'm going to try 39 for a while.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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12-06-2011, 01:08 PM | #73 | |
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I might have gotten the PSS if they were available in my size; but after this experience I'm much more likely to stick with Michelin.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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12-06-2011, 01:23 PM | #74 | |
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But even with the larger wheel size, and much shorter sidewall (along with increased tire pressure), the ride is still better than what it was with the RFTs. Part of that may be the loss of unsprung weight with the lighter wheel/tire combo. I believe I'm at about 36/38 psi, front/rear with 225/40/18s all around (I like the balanced handling of a square setup). |
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12-06-2011, 02:28 PM | #75 | |
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On my 18" the rec. pressures for over 100mph are 35/42, for under I _think_ are 32/35. Pressure makes a huge difference, play around with it, but it won't cure a weak sidewall.
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328i Sports Pkg, Michelin PSS on Staggered 18" OZ Ultraleggeras
. BMS Powerbox. Cyba scoops + Rev motoring intake hose + charcoal delete. Wavetrac LSD . M3: subframe bushings + sways + control arms (fr & rr). Meyle rear toe arms. M3 diff fr bushings . BMW Perf: v2 springs + v1 dampers. Valeo SMFW+clutch. 034 MotorSport engine mounts . Short Shifter + Turner PU bearing + ZHP M weighted shift knob. CDV delete |
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12-06-2011, 03:46 PM | #76 | |
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But the new tires (19 lbs each) make the whole car feel lighter. It's very strange but the vehicle as a whole behaves like a better, lighter vehicle. When I moved from 17" wheels to 16", I could feel a smoother ride. But this is different. At high speed, I actually like the way the runflats rode better. The new tires are not perfect over every impact. But at low speed there's no comparison.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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12-06-2011, 03:52 PM | #77 | |
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A higher sidewall doesn't help matters, but Conti can construct the tire any way they want to to get a result. If they are going to make a "max performance" tire, there are certain expectations that come with that, regardless of sidewall height.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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