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BMW 3-Series (E90 E92) Forum
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Power Flex Black series?
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12-11-2014, 07:23 PM | #1 |
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Power Flex Black series?
Anyone use these? Im about to order some and just wanted to know if anyone had any thoughts on them? Were they hard to install because they are a more rigid material?
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12-11-2014, 09:03 PM | #2 |
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It's tiny bit more rigid than their yellow bushings (95A vs 75A in terms of Shore hardness rating, google that up if you don't know what that means). What bushings did you order btw?
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07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization Last edited by Cloud9blue; 12-11-2014 at 09:45 PM.. |
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12-11-2014, 10:09 PM | #3 |
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I am still on the fence about ordering the subframe bushings and the diff bushings. Is it worth doing the diff bushings at the same time or just save it for a different time? I don't know how much disassembly is shared in the two jobs.
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12-11-2014, 10:41 PM | #4 | |
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FYI, I would go with the stiffest subframe bushing you can deal with and a bit softer diff bushings for NVH reasons.
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09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List]
07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization |
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12-12-2014, 05:08 AM | #5 |
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this.
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Current: 2017 F30 340i xdrive
Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost. Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold) |
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12-14-2014, 01:52 AM | #6 | |
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Drives: e92 335i, e34 525i & e60 530i
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12-14-2014, 08:20 PM | #9 | |
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everyone has different expectations and tolerance for NVH, so this sort of posts isn't exactly helpful.
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09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List]
07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization |
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12-14-2014, 09:58 PM | #10 |
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Just get aluminum subframe inserts and some yellow diff bushings. No issues what so ever.
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12-15-2014, 10:23 AM | #11 | |
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS |
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12-15-2014, 10:39 AM | #12 | ||
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I have all of the e92 m3 front and rear suspension mods. (Less than 6 months old) Including front strut bar. - Olhins coilovers with swift 12g springs in the rear positioned at 15 clicks from soft. - Megan adjustable toe links. - OS Giken vac built lsd with forged vac cover. - 265 Michelin pss in the rear (70% tread left) attached to oem 313 19 inch performance wheels. - power flex yellow subframe bushings and power flex purple diff bushings. RE tranny mounts. - car is a 6at with 54k miles with an aggressive PTF tune. FBO 50% e85. - alignment has been done 4 times over the last year to help rectify the problem below. Wheels and tires have been switched to also try and resolve this issue. Car will not stay in a straight line under hard acceleration. It goes perfectly straight under normal driving. However the right rear pushes out hard when I floor it. Wheels spin at 75mph if I punch it. I believe the subframe/diff are moving slightly due to the weak yellow/ purple power flex bushings. This seems to be a common problem power levels over 400rwtq. All I'm looking for is the car to track straight under full acceleration in a straight line. Hopefully this was more helpful. |
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12-15-2014, 10:52 AM | #13 | |
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The problem with stock frame turbo is the torque comes on so quickly, you really need stickier tires or be more gradual with the throttle (get some weight transfer to the rear wheels first before going WOT).
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09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List]
07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization |
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12-15-2014, 11:04 AM | #14 | |||
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS |
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12-15-2014, 11:07 AM | #15 | ||
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Tires are on the list... I haven't decided on which ones? I like the re11's and r888's. I may need to take a look at the rs3's. This is my daily driver so I do need some other needs, which is why I went with the pss. But I think you are absolutely right about them. Are there any other tires I should look at? |
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12-15-2014, 11:55 AM | #16 |
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Re11 is better for street use. Hankook grips betters in dry but awful when it is cold or wet.
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09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List]
07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization |
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12-15-2014, 12:17 PM | #17 |
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I ran the RE-11a this last summer for mixed DD/Auto-x use and was nothing but pleased with the performance.
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2007 335xi 6AT | Cobb Stage1+ | BMS DCI | VRSF 7" IC | FA 500 400#F/600#R | ARC8 17x9 et30 | RE-11a 255/40/17
Parting out car. For sale thread here: http://www.e90post.com/forums/showthread.php?t=1167583 |
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12-17-2014, 08:00 AM | #19 |
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How do the RE-11a's compare to the standard RE-11's?
I wish I could have 4 sets of wheels/tires. I've been researching tires a lot over the last few days and have come to this conclusion... The M PSS are a great all around tire that do really well in wet, cold and dry weather when new and with less than 450rwhp. One of the greatest benefits is how light weight they are compared to the other sticky wheels. Not to mention, the tread lasts a long time. Unfortunately I can't keep my car in as trainer line and would like even more grip. I can't decide between the RE-11's, RE-11a, Nt05/R888? It will be a daily driver in hot, cold and wet climates. I will also have upgraded RB's. I must apologize for turning this into a tire thread. It was not my intent. Someone I trust greatly recently advised that he felt my issue was 70% tire and 30% yellow/purple power flex bushings being too soft. If I had to do it again I would definitely go with stiffer bushings! |
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black, black series, powerflex, series |
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