Strange "hopping" after M3 Suspension Install

NocturnalEVO · 05-10-2014, 10:05 PM

Hey guys,

Looking for someone to shed some light on this issue for me. I'll explain n describe as best as I can.

So for the past 7-8 months, my E92 has been lowered on koni yellow shocks, eibach pro-kit springs, and supreme power front lowering perches. Wheel combo is 19x8.5" with 235/35/19 PSS tires and 19x10" with 265/30/19 PSS tires.

When I took hard turns that were more than the car could handle, the traction control would kick in. It was a pretty normal and standard ordeal.

Now about a month ago, I added full M3 suspension (front upper/lower and rear control arms, m3 front/rear sway bars, m3 subframe bushings, and m3 strut brace) along with a proper alignment.

While the car handles farr better now, one thing it's doing that's strange on the same hard turns is a kind of "bucking" or "hopping" almost, in what feels like the back wheels. The traction control doesn't blink or flash, so I'm not sure if it's actually loosing traction or not, but it's just a really strange vibration throughout the whole car on these hard turns.

Anybody have any idea as to what I'm talking about?

Thanks in advance!

GreekboyD · 05-11-2014, 08:32 AM

Classic wheel hop. Some guys will also add adjustable toe arms to the rear and lockdown kits after an LSD install.

nitehawk · 05-11-2014, 12:05 PM

Quote:

Originally Posted by NocturnalEVO

Hey guys,

Looking for someone to shed some light on this issue for me. I'll explain n describe as best as I can.

So for the past 7-8 months, my E92 has been lowered on koni yellow shocks, eibach pro-kit springs, and supreme power front lowering perches. Wheel combo is 19x8.5" with 235/40/19 PSS tires and 19x10" with 265/35/19 PSS tires.

When I took hard turns that were more than the car could handle, the traction control would kick in. It was a pretty normal and standard ordeal.

Now about a month ago, I added full M3 suspension (front upper/lower and rear control arms, m3 front/rear sway bars, m3 subframe bushings, and m3 strut brace) along with a proper alignment.

While the car handles farr better now, one thing it's doing that's strange on the same hard turns is a kind of "bucking" or "hopping" almost, in what feels like the back wheels. The traction control doesn't blink or flash, so I'm not sure if it's actually loosing traction or not, but it's just a really strange vibration throughout the whole car on these hard turns.

Anybody have any idea as to what I'm talking about?

Thanks in advance!

Do you have LSD? The m3 rear sway without LSD is typically not recommended and could be amplifying the issue.

NocturnalEVO · 05-11-2014, 12:22 PM

Nope, no LSD. Too costly unfortunately

robc1976 · 05-11-2014, 02:08 PM

Quote:

Originally Posted by NocturnalEVO

Nope, no LSD. Too costly unfortunately

Take rear sway off.

The HACK · 05-12-2014, 12:34 AM

Classic case of throwing money at a problem without fixing the root of the problem, IMO.

NocturnalEVO · 05-12-2014, 05:26 AM

Live and learn right? lol

So go back to stock sway bar on the rear. How about the front though?

Leave M3 front bar on? or go back to stock on the front as well?

Cloud9blue · 05-12-2014, 09:03 AM

You will be more or less fine with front sway. However 235/40 19 is way too tall, not sure how that would affect handling. Wouldn't you rub like crazy when you turn the wheels too? I ran 245/35 for a while, and even that rubbed just a little on the front fender liners in full lock.

NocturnalEVO · 05-12-2014, 12:14 PM

Oops! I wrote it wrong, my tire sizes are 235/35/19 and 265/30/19
No rub on full lock, however the wheel is far enough out that it smashed my plastic fender on a right turn into a parking lot

05-10-2014, 10:05 PM	#1
NocturnalEVO Stock 171 Rep 1,275 Posts Drives: 2009 E92 335i Join Date: Dec 2006 Location: Long Island, NY iTrader: (8)	Strange "hopping" after M3 Suspension Install Hey guys, Looking for someone to shed some light on this issue for me. I'll explain n describe as best as I can. So for the past 7-8 months, my E92 has been lowered on koni yellow shocks, eibach pro-kit springs, and supreme power front lowering perches. Wheel combo is 19x8.5" with 235/35/19 PSS tires and 19x10" with 265/30/19 PSS tires. When I took hard turns that were more than the car could handle, the traction control would kick in. It was a pretty normal and standard ordeal. Now about a month ago, I added full M3 suspension (front upper/lower and rear control arms, m3 front/rear sway bars, m3 subframe bushings, and m3 strut brace) along with a proper alignment. While the car handles farr better now, one thing it's doing that's strange on the same hard turns is a kind of "bucking" or "hopping" almost, in what feels like the back wheels. The traction control doesn't blink or flash, so I'm not sure if it's actually loosing traction or not, but it's just a really strange vibration throughout the whole car on these hard turns. Anybody have any idea as to what I'm talking about? Thanks in advance! __________________ '09 E92 335i (6MT) Jet Black/Coral Red '11 E90 328i XDrive (6AT) Jet Black/Saddle Brown (wife's car) '06 Evolution IX MR (sold) '06 R6 Anniversary Edition (sold) Last edited by NocturnalEVO; 05-12-2014 at 12:13 PM..
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05-11-2014, 08:32 AM	#2
GreekboyD Brigadier General 411 Rep 3,049 Posts Drives: 2009 BMW 335d Join Date: Jan 2012 Location: Toronto, ON, Canada iTrader: (0) Garage List 2009 BMW 335d [8.00]	Classic wheel hop. Some guys will also add adjustable toe arms to the rear and lockdown kits after an LSD install.
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05-11-2014, 12:22 PM	#4
NocturnalEVO Stock 171 Rep 1,275 Posts Drives: 2009 E92 335i Join Date: Dec 2006 Location: Long Island, NY iTrader: (8)	Nope, no LSD. Too costly unfortunately __________________ '09 E92 335i (6MT) Jet Black/Coral Red '11 E90 328i XDrive (6AT) Jet Black/Saddle Brown (wife's car) '06 Evolution IX MR (sold) '06 R6 Anniversary Edition (sold)
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05-12-2014, 12:34 AM	#6
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	Classic case of throwing money at a problem without fixing the root of the problem, IMO. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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05-12-2014, 05:26 AM	#7
NocturnalEVO Stock 171 Rep 1,275 Posts Drives: 2009 E92 335i Join Date: Dec 2006 Location: Long Island, NY iTrader: (8)	Live and learn right? lol So go back to stock sway bar on the rear. How about the front though? Leave M3 front bar on? or go back to stock on the front as well? __________________ '09 E92 335i (6MT) Jet Black/Coral Red '11 E90 328i XDrive (6AT) Jet Black/Saddle Brown (wife's car) '06 Evolution IX MR (sold) '06 R6 Anniversary Edition (sold)
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05-12-2014, 09:03 AM	#8
Cloud9blue Brigadier General 711 Rep 3,251 Posts Drives: around the potholes Join Date: Aug 2008 Location: NY/NJ/MA iTrader: (13)	You will be more or less fine with front sway. However 235/40 19 is way too tall, not sure how that would affect handling. Wouldn't you rub like crazy when you turn the wheels too? I ran 245/35 for a while, and even that rubbed just a little on the front fender liners in full lock. __________________ 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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05-12-2014, 12:14 PM	#9
NocturnalEVO Stock 171 Rep 1,275 Posts Drives: 2009 E92 335i Join Date: Dec 2006 Location: Long Island, NY iTrader: (8)	Oops! I wrote it wrong, my tire sizes are 235/35/19 and 265/30/19 No rub on full lock, however the wheel is far enough out that it smashed my plastic fender on a right turn into a parking lot __________________ '09 E92 335i (6MT) Jet Black/Coral Red '11 E90 328i XDrive (6AT) Jet Black/Saddle Brown (wife's car) '06 Evolution IX MR (sold) '06 R6 Anniversary Edition (sold)
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