CSG and RCE tag-team suspension Q&A thread! Ask us anything!

[CSG Mike]

Originally Posted by YDNA

my friend has some leftover swift springs in 6" 10k/12k and said i could have them for free. if i were to swap them out onto my kwv3s, would i have to revalve them? i was thinking of going to a stiffer rate but i think that might be way too high.

You'll be way underdamped. Yes, you'll need to revalve to properly damp 10k/12k springs.

Also, make sure the springs are the right size, not just the length you want.

[YDNA]

Originally Posted by CSG Mike

You'll be way underdamped. Yes, you'll need to revalve to properly damp 10k/12k springs.

Also, make sure the springs are the right size, not just the length you want.

Originally Posted by Racecomp Engineering

10k/12k would be pushing it big time for KW V3.

- Andy

would 60mm id or 65mm id be what i want? would running 7/8k or 8/9k be a better option?

[7thgear]

Originally Posted by YDNA

7/8k or 8/9k be a better option?

define "better"

what is it that you don't like about your current setup?

[YDNA]

Originally Posted by 7thgear

define "better"

what is it that you don't like about your current setup?

in my honest opinion, it's not stiff enough to my liking. i've been playing with the adjustments on the setup and would like to go a bit stiffer

[7thgear]

Originally Posted by YDNA

in my honest opinion, it's not stiff enough to my liking. i've been playing with the adjustments on the setup and would like to go a bit stiffer

define "stiff."

remember that the best tuned suspensions are generally comfortable. When you say "stiff" i think "harsh"

what is the car doing that you don't like? What would you like it to do?

furthermor, unless you are running aero and slicks, there is a limit to how high you want your spring rate to be.

it is very important that you understand cause and effect... that what you may want is not achieved in the way you think it is achieved.

[Racecomp Engineering]

Originally Posted by Wepeel

Real quick RCE - does the BRZ have the same rear tophats as the GR STI/WRX?

Crap...I'm 90% sure they are but can't exactly remember.

- andy

[Racecomp Engineering]

Originally Posted by YDNA

would 60mm id or 65mm id be what i want? would running 7/8k or 8/9k be a better option?

60mm

What kind and what size tires do you run?

- Andy

[YDNA]

Originally Posted by Racecomp Engineering

60mm

What kind and what size tires do you run?

- Andy

im on some cheap tires that my wheels came with right now but im gonna probably change to a 245/40/18 in rs3s or something along the lines of that

[iketeru]

I've been thinking about replacing the bushings in the rear subframe and diff mounts, but I'm reluctant to charge ahead without knowing the reason for doing so, even though it's a relatively cheap upgrade. whenever I see underbody videos of the movement in these locations, it seems to me that they exist to eliminate smaller vibrations which cause NVH.

my question is, is making these locations more stiff by replacing with poly equivalent to slightly increasing the damping in the coilovers, or do you think the dampers were designed to work with the bushings to start with? that is, if you put in poly, are you feeling the damping as it was meant to be, or not going to get enough damping?

thanks for the great thread, let me know if i'm in over my head.

[7thgear]

if you're not doing autocross "stock class", then I would highly recommend rear subframe bushings... on ANY car, you will feel the improvement and the NVH is not important, you will be very happy that you've put these in.

[iketeru]

Originally Posted by 7thgear

if you're not doing autocross "stock class", then I would highly recommend rear subframe bushings... on ANY car, you will feel the improvement and the NVH is not important, you will be very happy that you've put these in.

thanks 7th. any long term wear concerns with poly?

[7thgear]

Originally Posted by iketeru

thanks 7th. any long term wear concerns with poly?

not in applications where no twisting forces are involved. The subframe bushings will last you the life of the car, the diff inserts might wear out eventually but I don't see it being a problem for at least 10 years.

[Calum]

Originally Posted by iketeru

I've been thinking about replacing the bushings in the rear subframe and diff mounts, but I'm reluctant to charge ahead without knowing the reason for doing so, even though it's a relatively cheap upgrade. whenever I see underbody videos of the movement in these locations, it seems to me that they exist to eliminate smaller vibrations which cause NVH.

my question is, is making these locations more stiff by replacing with poly equivalent to slightly increasing the damping in the coilovers, or do you think the dampers were designed to work with the bushings to start with? that is, if you put in poly, are you feeling the damping as it was meant to be, or not going to get enough damping?

thanks for the great thread, let me know if i'm in over my head.

This is completely different then increasing damping of the shocks. These inserts will give more feedback about what's going on back there.

Like 7thgear, I'll also recommend these.

[7thgear]

this isn't directly related to anything in particular but i figured this would be the best place to post this

[ame="http://www.youtube.com/watch?v=NeXIV-wMVUk"]Wheel momentum Walter Lewin.wmv - YouTube[/ame]