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BMW 3-Series (E90 E92) Forum
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Serious Anti-Sway Bar Talk
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08-26-2012, 11:17 AM | #67 | |
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sway bars on this forum. A few folks who track their cars have installed and removed a larger rear roll bar due to loss of rear end grip.
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08-26-2012, 01:40 PM | #68 | |
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08-26-2012, 08:22 PM | #69 | ||
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Every car will understeer. Every single one. Before I do sways I would: -Slow down first, then get: -Grippier tires -Increase camber (need to get camber plates - relatively inexpensive) -Upgraded dampers/springs -Thicker way bar up front for RWD cars - OEM M3 or RDS.
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08-26-2012, 09:24 PM | #70 | |
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To be honest I don't understand why so many folks are experimenting with shock, springs and suspension bits, mixing them all, without understanding how suspension system function overall just to have problems. If you don't want to deal with coilovers and experiments yet you want sharp handling in a daily driver this is a no brainer in my mind. BMW really did an awesome job with this package. I think that it is going to be just superb with PSS tires. Highly recommend it!! |
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08-26-2012, 11:44 PM | #71 |
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Ok, this thread is hilarious!! To die hard trackers, I agree, big rear sway can cause problems. For "have fun" street drivers, the M3 rear bar is great. I've even had an H&R rear bar and it was fine, on the street. I never crashed and had a car that felt sharp.
My last E90 had BMW Perf Springs, koni yellows/whites, and M3 front and rear bars and the car was really fun on the street. kinda go-kart-ish. I now have a stock ZSP E90, and it's pretty dull. I have dinan spec rear shocks waiting, just need front yellows and I'll go from there. May do sways but I'm hoping not to have too. Not as invested in this car.
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08-27-2012, 12:45 PM | #72 |
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most tuners i talked to, even harold at HPA recommended OEM sports rear bar due to power these beast put out tuned to the wheels to keep them on the ground. on turns at least, prob not a big deal for rest interested in 1/4 miles
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08-27-2012, 02:44 PM | #73 |
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[QUOTE=CJ421;12574039]No but the car is quite neutral now, which may not be desirable depending how you like to drive. I have to be careful modulating the throttle out of tighter turns; I oversteered today as a matter of fact and had to correct. Rear comes out fast. I think I would be just fine with the stock rear sway; I am thinking about going with a thicker front.
This is true even with a 13 or 14mm rear bar and why I didn't go with the M3 rear bar. It would be nice if the rear of my car felt flatter but not at the expense of increasing throttle oversteer, which is a little harder to modulate w/a turbo car.
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08-28-2012, 12:19 AM | #74 |
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Agreed in full. The BMW turbo engine feels relatively linear on the street but on the track it is not; modulating the throttle is a skill set in itself. An LSD helps tremendously with control.
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08-28-2012, 08:36 AM | #75 |
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08-28-2012, 11:17 PM | #76 | |
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09-10-2012, 11:35 AM | #77 | ||
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09-10-2012, 11:37 AM | #78 | ||
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E93 335i Alpine White, 19" Works, PSS, M3 arms, M3 bushings,M3 E93 FSB/E92 RSB, powerflex rear diff bush.
AST 5100 with M3 rear camber arms. GC street plates. |
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09-10-2012, 09:46 PM | #79 |
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900# rear is too high, the car is not engineered to handle that. 800# is max. I would think twice before going with an 800# rear for street use unless you have a very good damper. And adding a stiffer rear sway bar into the mix on top of that ... way way too stiff IMO. Research, research, research ...
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09-11-2012, 01:27 AM | #80 | |
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Stiffer rear sway bar is entirely unnecessary especially once you get more power down to the ground and stiffen up the suspension. The back end will be coming out enough as it is without the help of a bigger sway bar. |
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04-12-2013, 06:29 AM | #81 |
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So just to correct something posted at the beginning of this thread:
M3 rear bar is 23.6? and M3 Convertible is even thicker? I really don't want to change my front bar. But I am worried that just 23.6 in the back is too stiff. H&R makes a 20mm bar. Would that be a better choice you guys think? |
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04-12-2013, 09:30 PM | #82 |
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Didn't you read your thread? You got the straight scoop from guys who've modded their susp quite a bit and drive their cars at the track. Leave your rear bar as is unless you add a larger bar up front and even then the M3 rear bar is probably too big. E93 M3 is 23.6 mm. E90/2 M3 is smaller. If you want to reduce understeer, add grip up front with wider, grippier tires and neg camber.
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04-24-2013, 06:06 AM | #84 |
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Ok I am about to buy an M3 rear sway bar.
E93 M3 Convertible has 23.5mm rear sway. I was told that E90/E92 M3 rear sway is 20mm, but HPA lists it as 22.5: http://hpashop.com/BMW-OEM-M3-Rear-A...bar-e9x-m3.htm Is this correct? I need the smaller of M3 rears. |
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04-25-2013, 11:56 PM | #85 | |
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Just to compare, E46 stock sway bar sizes:
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05-14-2013, 11:55 AM | #86 |
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My rear E90 M3 bar came from HP Autowerks.
I have two questions: 1. It came with bushings and the mounts. I guess I have to reuse the same bolts. Bushings seem to be really small for the bar. How did you guys put the bushing to mount? I spent hours and cannot get it to work... 2. It didn't come with end links. So I will have the stock non-M end links in the rear. Would this be fine for now? |
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05-14-2013, 06:29 PM | #87 | |
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05-14-2013, 07:00 PM | #88 |
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I would be very careful only doing the rear bar. I had the BMW performance suspension (ver 2) on my E92 and did the M3 rear sway along with my M3 rear subframe bushings and Quaife LSD. With the DSC/TC on there was no problem but when doing AutoX with the nannies off the car would oversteer VERY easily. You would think about turning and it would oversteer. I took it off for the stock pencil thin bar the next day and the handling was more predictable and the car was balanced almost perfectly.
I assumed that with the stiffer front bar that came with the PS that it would be okay...I was wrong and it was an expensive experiment for me. So with your stock suspension and no LSD, I would recommend against it. So proceed with caution or get the M3 front bar and install in along with the rear. |
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