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"Guide Support" question
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11-27-2011, 09:59 AM | #1 |
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"Guide Support" question
Found a set of ZSP springs for my non-ZSP E90 328. (not easy in this 335-dominated forum )
Aside from the bump stomp which I knew about, realoem shows a different part number for the "guide support" for sport/performance vs non-ZSP... http://www.realoem.com/bmw/showparts...16&hg=31&fg=10 Its also double the price. Anyone know what/why the difference for this part between sport/non-sport, and what horrible things may happen if I skip it? Thanks.
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2009 E90 328i Montego Blue, Black Leather, 6MT, ZPP, Logic 7, HD radio, CA, fold-down seats, PDC. ED pickup 6/12/2009 mods: Koni FSDs, Eibach Pro's, Sport/Heated Seats, BMW Perf. short shifter, M-tech shift knob/e-brake handle/steering wheel, split armrest, black grilles, 50% tint, 3M clear bra. Last edited by hdrewh; 11-27-2011 at 10:32 AM.. |
11-27-2011, 12:42 PM | #2 | |
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EDIT: Also, the sport guide support is made of steel and not aluminum, and is much heavier and probably much stronger. I have a pair of sport guide supports that came off my car with about 14K on them, if you decide you want to change. I think the ZSP suspension will work a little better if you use slightly shorter bump stops. In front, use the one from E36 M3. In rear, from E85 Z4, p/n 33 53 6 770 350 (includes dust tube). The potential risk from using shorter stops is additional understeer, and the benefit is the car body will remain flatter over bumps.
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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.
Last edited by luckyu; 11-27-2011 at 12:49 PM.. |
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11-27-2011, 05:22 PM | #3 |
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Thanks, great info. Ya know, I got a good deal on barely-used ZSP springs, with the intention of pairing them with Koni FSD's, and hoping to get a decent deal on a ZSP front sway as well, essentially correcting my non-ZSP purchase decision.
But the Koni's, if I can't find 'em used, round up or down to $700 depending on where I order from. Add it all up and I'm within BMW Performance Suspension territory, give or take a couple hundred. So I might go that route instead. Remaining concern is the tighter Performance Springs, I hesitate based on the roads where I live.
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2009 E90 328i Montego Blue, Black Leather, 6MT, ZPP, Logic 7, HD radio, CA, fold-down seats, PDC. ED pickup 6/12/2009 mods: Koni FSDs, Eibach Pro's, Sport/Heated Seats, BMW Perf. short shifter, M-tech shift knob/e-brake handle/steering wheel, split armrest, black grilles, 50% tint, 3M clear bra. |
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11-27-2011, 05:52 PM | #4 | |
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I don't know if you're in the City or not. Lowering the car can make a big negative difference on how your car feels on really rough roads. Also, I have a suspicion based on several "335 in NYC, Oh God the pain" threads, that stiffer shocks and more suspension travel can actually be more comfortable. Porsches are said to handle NYC potholes better than 335, and M3 is also better.
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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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11-27-2011, 06:00 PM | #5 |
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Makes sense. I don't live in the City but work there, and often drive in.
Which shocks and bump stops (shorter=more travel?) would yield more suspension travel in my upgrade quest, and any idea how they would compare with the out-of-the-box Performance Suspension? Still coming up the learning curve here.... Thanks again. Last edited by hdrewh; 11-27-2011 at 06:39 PM.. |
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11-27-2011, 06:46 PM | #6 | |
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EDIT: Also I think Bilstein monotubes and Koni Yellows are a much higher quality shock than whatever is in BMW's kit. In particular I have a lot more faith that Bilstein's tuning is really good now that I've tried it; but also B's are more rugged, they last longer, response is better, theyit don't fade, and they're rebuildable and revalvable. I guess you could say I'm a convert... Bump stops, I gave the parts I would use. I haven't used them to increase total travel, but I chose to use shorter ones so they don't engage as much, because that caused the car to wallow and float a lot. EDIT: I did a lot of measurements to ensure I had enough room in the wheel well, and to ensure no coil bind in the rear. Performance suspension is going to lower your car more than ZSP springs. BMW says 10 mm lower, which if we believe them that would be as low as 13.6". I would ride no lower than 14.25" in front, but probably your current height is even better. It's lowering the car that causes problems with ride quality and suspension travel. The problems can be alleviated with any or all of: stiffer springs, stiffer shocks, different bump stops, and shorter strut/shock bodies. Companies who make coilovers make shorter bodies, but the alternatives you're considering use standard length, so space under there is limited. I don't have a formula for how much travel or ride height is really necessary in various circumstances. I chose to address everything: higher ride height, shorter bump stops, stiffer shocks, and... actually springs were basically the same as before. I wanted to be sure, so I threw everything at the problem! If you read my "M3 on 328i" thread and find it confusing because I don't explain the basics, let me know and I'll make a new thread to try to explain things better.
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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.
Last edited by luckyu; 11-27-2011 at 08:16 PM.. Reason: clarification + Bilstein plugging |
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