07-20-2018, 07:45 PM | #1 |
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Rear sway bar upgrade only
I have a '15 M235 manual rwd with Dinan springs. I'm about to install the lsd and my shop says changing the rear sway bar would only add a bit more labor. Not a track car, just street and a couple of AX every season. Not serious. The car always felt to me like the rear bar was way too small. Has anyone run just an upgraded rear. Trying to maintain good street manners but don't want to severely unbalance the car.
Last edited by CO_Steve; 07-21-2018 at 05:06 PM.. |
07-21-2018, 02:31 PM | #2 |
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Not upgraded my 2 series, but I fitted the 235/40 rear ARB on my F30. Maybe a great improvement going from 13mm to 15mm. I expect the 2 series would benefit the same, just to give a little more rear stiffness.
I wouldn't go very stiff though. |
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07-21-2018, 05:05 PM | #3 |
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That was my intention but there are only a few choices. Both the Dinan and Hotchkis say they are 100% stiffer than stock in the rear. Not calibrated on if that's too much. For your 13 to 15 change for a solid bar that would be 50% stiffer (approx).
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07-21-2018, 05:40 PM | #4 |
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You might try calling Bimmerworld to ask them about the Hotchkis unit (that they sell) - you'll get a straight answer from them as to the difference it would likely make given your needs and how you use your car.
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08-13-2018, 03:44 AM | #5 |
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If upgrading the rear springs is an option, try going up in rate first.
A larger rear bar will take away the effectiveness of the LSD if you are still in a turn, especially so if you are running a gear type LSD. |
10-28-2018, 08:05 PM | #6 | |
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The M2 if I'm not mistaken is around 25mm with a true LSD. so how is upgrading the rear Stabilizer bar going to decrease the effectiveness of the LSD in a M235??? |
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10-28-2018, 09:51 PM | #7 | |
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10-29-2018, 06:28 PM | #8 |
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Would definitely suggest it if doing the LSD at the same time, that and Diff Bushings, 100%
It will make the car sharper on turn-in and corner exits, and a bit more playful at the same time. If not doing the LSD, you'll create a lot more inner-wheel spin on corner exits..
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11-19-2018, 02:05 AM | #9 |
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I have a 32mm sway bar in the front now!
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11-19-2018, 02:09 AM | #10 | |
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The largest RSB I can find is a 20mm non adjustable Do you know of anything larger that will work? |
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11-23-2018, 05:32 PM | #11 |
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11-23-2018, 06:04 PM | #12 | |||
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When I had my build done, I made it clear that getting this tank to turn in was a principal objective of mine. My signature shows what I've done, and I was informed by the builder that if I wanted better turn-in a front sway bar was the next step - but at the price of some street comfort. I did ask about a rear bar. I don't remember the response - basically, it wasn't part of the conversation. FWIW, my focus is Mid-Ohio, a handling track.
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11-24-2018, 08:24 AM | #13 | |
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Hell, I had a Miata that came with a 12mm RSB. I have put a MPERFORMANCE LSD in this car and coded out the eDif nannies. So after driving in several events and driving the M2 with a 24mm RSB its obvious this car NEEDS a larger RSB. Heck BMW recognizes this thus the 24mm RSB on the M2. The challenge for us M235i owners is finding a larger then 20mm RSB that is adjustable. What would be really be kool is for Bryan at Karcepts to build one of his most impressive three piece adjustable Sway Bars that he fabricates for the S2k and Miata crowd for us M235i owners with a true LSD. Last edited by Shadowfax028; 11-24-2018 at 03:05 PM.. |
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11-24-2018, 08:20 PM | #14 | |
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PS: the difference in handling between the M2 and M235i, though, hardly boils down to thicker sway bars alone. there's way too many differences between the two, e.g., subframe bolted to the frame directly as opposed to via bushings, different springs and shocks, harder bushings throughout, etc. |
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11-26-2018, 01:43 AM | #15 |
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I couldn't find anything adjustable for the rear, so settled for the Hotchkis set (front 3 settings). No complaints, the car handles great, and is plenty stiff on the lowest setting, especially with higher spring rates and uprated bushings..
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12-05-2018, 09:52 AM | #16 | |
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Honestly cant tell the solid bushings are in. The RSB definitely helps this car. |
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12-06-2018, 09:58 AM | #17 | |
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After installing the LSD, rear subframe bushings and RSB. What alignment specs did you settle on for autocrossing? Camber, caster, toe in toe out? |
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12-07-2018, 02:09 PM | #18 |
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Do you have a set of rear springs that are higher in rate?
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12-07-2018, 03:01 PM | #19 |
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