my R53 2006 is a little loose when i need to brake hard from speeds around 80 mph... My mini is equipped with H&R Clubsport Coil Overs height adjustable setup at the lowest possible and still usable in daily traffic exept big bumps... (have to take another road ) And anti roll bar from H&R front and rear... Please help me.. i dont like that loose end.. i whas thinking of Alta Rear Control Arms... Do they work?

 

The rear control arms will help you with the alignment if it's out of spec. I don't know many people running a front swaybar on an R53... You may be a little too stiff.

 

I have the H-Sport sways, listed in my sig. I also have one pair of Alta rear control arms. I have never experienced this unless there were a few times in poor condition...which the condition actualy caused the handling problems.

So, No I have not experienced what you are going through. I would check my alignment and go from there
Control arms may help as well especially if the alignment is off.

BTW nice mirror caps Where did you find those?

 

I did my home work on these rear control arms. Go with the H-Sport bars. They have zyrk fittings on them which keeps the noise down.
I have spoke to alot of people about these even the guys at Alta said go with the h-sport bars for daily driving. I put all four on (upper and lower). They work spectacular. Lots of rain we have had makes the grease go away and squeak a little but over all great choice.

Steve

 

I you want options on Rear control arms there is a thread I believe started by 03Indigo that was quite indepth and compared a lot of different arms.

 

Here is a thread to read through

https://www.northamericanmotoring.co...d.php?t=111812

 

I hear you on the front sway bar it took my mekanik buddy and i 2 days to install it all. The car is allainged just 2 weeks ago. I tried my buddies r53 cabrio works it had the same problem ( loss rear end) Maybe ime pushing it to hard??... Going to the mini track arrangement in may at nuernburg ring in germany with my own car. . I made the mirrors myself took me 20 days + clearpaint... Maid alot of poul smith badges in folie, just write your adress an i will send you some...

 

Do you want my email address?
Thanks for the info. Hope you can solve this problem.

 

no home adress.. a bit hard to send some sticker by email...

 

Why are you looking at rear control arms? What is the car's current alignment specs? Control arms would just allow you to add camber and / or change toe. Is it loose around corners or in a straight line? How high of speeds are we talking? Nothing you buy will change the laws of physics, and braking will always put more weight up front, loosening the rear. I wouldn't suggest just buying something for the hell of it.

 

i know about weight distribution ... Have been racing shifterkarts for 10 years... (kart with front brakes). Still think that its to loose

 

Unless you have adjustable rear links and front camber plates you would not be able to get proper toe and camber settings with the car lowered as far as you say yours is. So I would definitely be looking at adding them and get a new alignment.

With your shifter cart experience I would think that you have checked air pressure in all of your tires.

 

meb, onasled or petrich, but one of them was having a problem when their front end was bumpstopping under braking, meaning their spring rates were going threw the roof, and this was causing their car to be deadly twitchy under hard braking. Since youre slammed, id bet that is the issue, check your bumpstops.

 

I wasn't really asking about your shifter kart experience, I was asking why you thought control arms would solve this problem.

 

Could it be that you have too much over-steer dialed in through your selection of anti-sway bars f/r?

If the rear is too stiff in reference to the front, the rear will obviously tend to rotate more than you would like in some situations. I've seen people on here set up their cars insanely stiff in the rear and stupidly loose in the front and I don't understand how they haven't lost it already. I run the stock front sway bar and an Hsport 19mm on full stiff. I have TSW springs and stock damper. I do not have camber plates or adjustable rear arms installed.

I have the FSB and USS. The car rotates extremely willingly and exhibits mild snap-oversteer during lift-throttle high-speed turns.

I'd imagine that if I were braking hard as opposed to simply lifting the throttle, the same would hold true.

This sounds to me like a case of trying to get more rotation than maybe you really need. Also, you suspension setup for an autoX may not be the best or safest setup for hard braking at 80mph...

 

i didnt ime asking you guys with the experiance... you where saying something about weight and pshysiks

 

what is autox?

 

Has it been corner weighted?

Alan

 

another contributor is the crappy front control arm bushings. They allow for a lot of alignment changes under extreme conditions.

Matt

 

Well, like others said, if the weight is shifting too much to the front during breaking, maybe try and stiffen up the front a bit, and soften the rear, so that the weight distribution doesn't change so drastically upon hard braking.

 

autox is Autocross.

 

the weight shift is due to the geometry of the car. The center of mass is where it is, and the wheel base is what it is.

Matt

 

Sounds like a too soft front spring compared to the rears. Too much front weight transfer. Not sure how control arms would help.

Matt, but stiffer fronts would eliminate some of the front dive correct?

 

but it wouldn't change the force on the front end that much, unless the center of mass moves much. If you're really stiff in the front, and really soft on the rear, the back end will lift and the center of mass will as well. This will increase the lever arm and the coupling. The stiffer springs would decrease deflection. Camber doesn't change too much with compression up front, but I don't know about toe. I do know that the sloppy front bushing do effect toe and caster.. Or is that castor, geeze, my spelling sucks....

Matt

 

For what it's worth, my car used to be a bit squirly under hard braking. My car has gotten around and has had its share of mishaps with curbs and other cars. After I got camber plates, and all 4 adjustable rear control arms and set my alignment, the car became more stable. Obviously, the car did not exhibit this shimmy when new.