Horrible Stability Issue Need Advice maybe "stability bar ralated issue"
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 397
Likes: 7
From: San Francisco
2016 Freightliner "daily driver"
Horrible Stability Issue Need Advice maybe "stability bar ralated issue"
To summarize my issues the rear end of my car pulls left and right under heavy acceleration to a point I feel it is unsafe. I am pushing out about 580hp at the wheels so traction is a problem but not the cause for the car acting this way. I have a quiafe diff in there and had it before I installed my MB arts stability toe arms and never had this issue before. I can't even floor the car on the freeway going 60 because when I do the traction light just blinks and the car pulls me into other lanes. Please let me know if anyone else ever had this issue, I am leaning toward the MB arts bars since it's the last thing I've done to my car after this issue arose. The alignment is 100% to factory specs except for camber being -.5 off in the front and -1 degree in the back.
MBWorld Fanatic!
Joined: Sep 2008
Posts: 3,575
Likes: 8
From: BC
Haters crazy
hankooks are garbage!!!!!!, try a better tire that sticks! It should make a difference, a lot people over look this, but not every tire is the same.
I've found falkens to hook better than hankooks, but Im sure somebody can suggest better tires than falkens/hankooks...
I've found falkens to hook better than hankooks, but Im sure somebody can suggest better tires than falkens/hankooks...
MBWorld Fanatic!
Joined: Sep 2008
Posts: 3,575
Likes: 8
From: BC
Haters crazy
Trending Topics
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 397
Likes: 7
From: San Francisco
2016 Freightliner "daily driver"
Thanks for all the help guys, I did notice my tires rubbing against the fender slightly but nothing that I would think might cause this. I will roll my fenders tomorrow and see if it gets any better.
MB World Stories
The Best of Mercedes & AMG
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 397
Likes: 7
From: San Francisco
2016 Freightliner "daily driver"
Yes I have definitely noticed that also, so basically it's my tires ? I had these tires on the car for a few months really noticed the problem only after the mbarts toe arms. But it is possible that a hp increase might have caused it also since I did do a 180 ml pulley and fixed a tensioner that was not keeping the belt from popping off at all, at the same time. I guess I will just raise my car up and see if it still shoes the same symptoms.
Banned
Joined: Jan 2011
Posts: 100
Likes: 0
CLS55 AMG
To summarize my issues the rear end of my car pulls left and right under heavy acceleration to a point I feel it is unsafe. I am pushing out about 580hp at the wheels so traction is a problem but not the cause for the car acting this way. I have a quiafe diff in there and had it before I installed my MB arts stability toe arms and never had this issue before. I can't even floor the car on the freeway going 60 because when I do the traction light just blinks and the car pulls me into other lanes. Please let me know if anyone else ever had this issue, I am leaning toward the MB arts bars since it's the last thing I've done to my car after this issue arose. The alignment is 100% to factory specs except for camber being -.5 off in the front and -1 degree in the back.
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 397
Likes: 7
From: San Francisco
2016 Freightliner "daily driver"
180ml pulley, 82ml throttle body, ported manifold, ported sc inlet/output, EC long tubes, EC stall, custom 3" mandrel bent exhaust with resinator and cat deletes, Custom heat exchanger, green filters that will do it on the performance side and got a quiafe and mbarts stability bars.
Super Member
Joined: Aug 2005
Posts: 725
Likes: 1
From: SoCal
05 E55
I have had this issue forever... it started after I went with a Kleeman diff and 285 PS2s 4 years ago. Since I couldn't see any rubbing whatsoever, I started leaning towards the diff (and the other hp increasing mods at the time). I had it like crazy on drag day in Fontana in 06... UNTIL i put the stock tires back on... gone!. So, I know there is some dynamic here I haven't figured out other than the obvious tire size issue. For me, it also gets worse on sport 2. If I raise the car and leave it on soft, it works best. When I went to 295 PS2s on 20s it stayed the same. Again, I have chalked up the wheel well, driven around the block and can't find any detectable rub. So weird. I have undone all of my washer lowering (and rear bolt adjustment) and it is better, but still sways. And yes, at 60 if I mash it, it is downright scary. I lose many a race off the line as traction control spazzes out and the car wiggles to 65 or so. I'm going to replace the tires with 285s next time around and try and find some sort of compromise. I too have posted on this subject for ages, and just when I thought I had it licked (extended my wheel wells, custom metal job), it returned after a while. Ugh.
Senior Member
Joined: Jan 2011
Posts: 302
Likes: 1
From: Pittsburgh
'20 GLE350, '21 F150 Raptor, '03 BMW M3, '22 KTM 890 ADV, '23 Triumph Trident 660
Just a thought... could the control arms be moving so much that they are putting the rear alignment out of whack? Would better bushing material help?
I don't know the suspensions on these cars well enough to know if this is a consideration.
Bill
I don't know the suspensions on these cars well enough to know if this is a consideration.
Bill
MBWorld Fanatic!
Joined: Dec 2009
Posts: 1,046
Likes: 28
From: SOCAL
2004 E55
I have had this issue forever... it started after I went with a Kleeman diff and 285 PS2s 4 years ago. Since I couldn't see any rubbing whatsoever, I started leaning towards the diff (and the other hp increasing mods at the time). I had it like crazy on drag day in Fontana in 06... UNTIL i put the stock tires back on... gone!. So, I know there is some dynamic here I haven't figured out other than the obvious tire size issue. For me, it also gets worse on sport 2. If I raise the car and leave it on soft, it works best. When I went to 295 PS2s on 20s it stayed the same. Again, I have chalked up the wheel well, driven around the block and can't find any detectable rub. So weird. I have undone all of my washer lowering (and rear bolt adjustment) and it is better, but still sways. And yes, at 60 if I mash it, it is downright scary. I lose many a race off the line as traction control spazzes out and the car wiggles to 65 or so. I'm going to replace the tires with 285s next time around and try and find some sort of compromise. I too have posted on this subject for ages, and just when I thought I had it licked (extended my wheel wells, custom metal job), it returned after a while. Ugh.
You already have your answer. the stock tires with their taller sidewalls are providing more directional stability since they are loading up less than the rubberband sidewalls you have with your 20's (A horrible choice for drag runs and handling anyway due to the centrifugal force increase over the 18's because of that the 18's will ALWAYS be faster) Even if you heim jointed your rear suspension you would have the waggle as the car bounds off the sidewall as you load them from a launch
Super Member
Joined: Aug 2005
Posts: 725
Likes: 1
From: SoCal
05 E55
You already have your answer. the stock tires with their taller sidewalls are providing more directional stability since they are loading up less than the rubberband sidewalls you have with your 20's (A horrible choice for drag runs and handling anyway due to the centrifugal force increase over the 18's because of that the 18's will ALWAYS be faster) Even if you heim jointed your rear suspension you would have the waggle as the car bounds off the sidewall as you load them from a launch
And my first experience came with it merely after have Kleeman mods on the car (lsd, pulley, ecu) ... my existing Kinesis 19s with 285s then reflected the same problem, and they previously hadn't.
So, if your theory is true this happens on low profile tires on 55s who have crossed some sort of horsepower barrier with mods... which I would LOVE to believe.
As a note, yes, we know 20s aren't canyon carving champions... but not being someone that relies on my 55 to out handle anything to begin with, that's not a concern of mine. I have different sets of wheels for different things, and the 20s were awesome looking at the time. I wish they made this style in 19s... but they didn't.
Loren
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
imho, it's more an issue of tire width compared to rim width more than sidewall independently. iirc, most issues were seen when people were mounting 275's on the stock rim or 285's on rims less than 10" wide and 295's on less than 10.5". obviously tires with a softer sidewall will be more prone to causing the problem.
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 397
Likes: 7
From: San Francisco
2016 Freightliner "daily driver"
From what I know I am running 285's on 10.5 inch wheels, also my tire's were rubbing and after rolling the fenders the stability issue got way better but still present. After doing some more work on my car I noticed that my front drivers side inner and outer tie rods were bent. This is weird considering I just got an alignment about a month ago and it came out to spec. I will change the parts tomorrow and hope this is the fix to my issue, and if not them ps2's are next on my list.
Junior Member
Joined: Jun 2024
Posts: 31
Likes: 1
E55AMG
From what I know I am running 285's on 10.5 inch wheels, also my tire's were rubbing and after rolling the fenders the stability issue got way better but still present. After doing some more work on my car I noticed that my front drivers side inner and outer tie rods were bent. This is weird considering I just got an alignment about a month ago and it came out to spec. I will change the parts tomorrow and hope this is the fix to my issue, and if not them ps2's are next on my list.
did you find the issue cuz i have the exact problem as you and im not finding the problem the alignment its correct i dont know whats going on
