R56 Suspension tuning viewpoints
Thread Starter
|
5th Gear
Joined: Jun 2009
Posts: 663
Likes: 11
From: Maryland
Suspension tuning viewpoints
09 S. Single driver, run flats. The rear hops over expansion joints. I would like the tires to remain in contact with the road. Maks flying around on-ramps less dramatic.
Your views on root cause:
1: Run flats just too stiff
2: shock just too stiff
3: rear spring rate just too high (probably set for max load)
My experience setting up my RSX with KW's was the spring rate.
I have not driven the HD shock car or a JCW. How do they fair in this?
Your views on root cause:
1: Run flats just too stiff
2: shock just too stiff
3: rear spring rate just too high (probably set for max load)
My experience setting up my RSX with KW's was the spring rate.
I have not driven the HD shock car or a JCW. How do they fair in this?
6th Gear
Joined: Mar 2007
Posts: 7,578
Likes: 4
From: Paradise
Alta claims that the hopping about on rough surfaces is due to the rubber used in the lower control arm bushing in the front suspension.
Perhaps someone who has installed their PSRS can comment on how effective it is. I'm tempted, because there are a lot of winding roads where I live that don't have the smoothest road surface. Having the steering wheel jerk around on curves is disconcerting.
Unfortunately, this seems to be a difficult install. Not something I'd want to do myself. I'm also concerned about it increasing road noise in the cabin. I've gone to a lot of trouble to try and reduce road noise.
The MINI has very minimal adjustments to the front suspension, toe in or out only. ALTA has seen tremendous benefits from changing the levels of caster in the front. This increase in caster allows sharper more precise response from steering input. Decreases understeer and improves overall feel.
Also, the OEM lower control arm bushings supplied from MINI are a very gooey like rubber compound. While great to reduce road noise, they are miserable at improving handling. As a result even the most minor of imperfections in the road surface can cause the car to dart around. The ALTA PSRS uses a firm bearing material that prevents this. This inspires confidence in all driving conditions, and again adds positive steering response.
Also, the OEM lower control arm bushings supplied from MINI are a very gooey like rubber compound. While great to reduce road noise, they are miserable at improving handling. As a result even the most minor of imperfections in the road surface can cause the car to dart around. The ALTA PSRS uses a firm bearing material that prevents this. This inspires confidence in all driving conditions, and again adds positive steering response.
Unfortunately, this seems to be a difficult install. Not something I'd want to do myself. I'm also concerned about it increasing road noise in the cabin. I've gone to a lot of trouble to try and reduce road noise.
6th Gear
Joined: Jun 2006
Posts: 4,165
Likes: 400
Trending Topics
Banned
Joined: Jul 2009
Posts: 560
Likes: 0
From: Amsterdam/Nurburg/Orlando
the pssr or psrs thing alta sells is a tough install and expensive200+,i would spend a total of 170 dollars and have poly bushings front and rear.
6th Gear
Joined: Mar 2007
Posts: 7,578
Likes: 4
From: Paradise
Would that stop the steering wheel jerking when hitting a bump on a turn?
1st Gear
Joined: Apr 2009
Posts: 36
Likes: 0
09 S. Single driver, run flats. The rear hops over expansion joints. I would like the tires to remain in contact with the road. Maks flying around on-ramps less dramatic.
Your views on root cause:
1: Run flats just too stiff
2: shock just too stiff
3: rear spring rate just too high (probably set for max load)
My experience setting up my RSX with KW's was the spring rate.
I have not driven the HD shock car or a JCW. How do they fair in this?
Your views on root cause:
1: Run flats just too stiff
2: shock just too stiff
3: rear spring rate just too high (probably set for max load)
My experience setting up my RSX with KW's was the spring rate.
I have not driven the HD shock car or a JCW. How do they fair in this?
3rd Gear
Joined: Aug 2006
Posts: 264
Likes: 0
From: Edmonton, Alberta
The PSRS is $209 I believe for the front control arm bushings. The labor to install PSRS or poly bushings for the front will be identical, it's the same amount of disassembly...
Thread
Thread Starter
Forum
Replies
Last Post
igzekyativ
MINIs & Minis for Sale
34
Jul 16, 2020 12:54 PM
Mini Mania
Drivetrain Products
0
Aug 21, 2015 11:25 AM
PelicanParts.com
Vendor Announcements
0
Aug 4, 2015 02:45 PM