just curious if anyon is running the Buddy Club Racing Spec coilover for the 350z.
the specs looks interesting. Any vendor here actually carry this?
looking for impressions

 

link please?
thanks

 

http://www.buddyclub.us/buddyclub/rsd/rsd_f.html

 

those are some very strange spring rates

 

Yeah, why only 5kg at the rear?

 

better question, why 14 kg up front with such a soft rear!

 

Probably the test car has other suspension components modified?

 

http://www.takakaira.com/performance...e=Buddy%20Club


On this site, I think it says the rear spring has variable rate?

But I still don't know what it means because it is just translated straight from Japanese.

Maybe it means the rear spring is not actully 5kg?!

I think a online shop called driftperformance sells them too but I forgot the website address

 

I just found out today they use separate springs for the rear.

So one 5kg spring on the damper and another 6~12kg variable rate on the stock spring location

 

I was looking forward to the Buddy clubs finally coming out, not anymore based on spring rate specs.

Several things come to mind.

1.6kg-12KG is a huge rate spread, progressive coils have no business being on a performance coilover system, let alone a higher end one. They can only see their liabilities ironed out for certain circuits where the R&D staff hammers settings out using telemetry. Meaning anywere else they are a liability to performance driving.

2. Coilover systems that run springs on the rear dampner bodies present a serious clearance problems for those running wider rear tires or those that plan to.

3. Front to rear roll stiffness balance needs to be looked at. You simply cannot trust every companies R&D department to be sensicle in this area of tuning. You have to take the control and say yes or no way.

Rear springs on the coilover body leverage different forces to the suspension then does a spring run in the normal rear oem location.

Front motion rate is .53 with a 10 degree angle correction needed. (Basically you times the front spring rate by .53 then you times that answer by .96 and that is your actual wheel rate.

Rear motion rate is .36 for the oem spring location and .59 at the shock/dampner body.

Let's run the math. (Wheel rate is the actual amount of spring force the suspension leverages to the tire).

Oem spring rates
314/342

Oem wheel rates
160/123

Buddy Club Racing spec coilovers spring rates
748/336 to 672 + 280 on dampner

Buddy Club Racing spec coilover wheel rates
381/286 to 407

Wheel rates vs oem
Front:+238%
Rear: +233% to 331%


Using rear inital spring rate front to rear roll stiffness balance is:
+5% transfer to the front

Using rear final spring rate once rear progressive spring peaks when compressed. Front to rear rollstiffness balance is,
+93% to rear

So, now I fully understand why Steve **** at Buddy Club so easily expressed that the company would be willing to allow me to order different spring rates with revalved dampners to match.

 

http://www.kgm.co.jp/DNA/evo_vol2.htm

I guess this is the exact same setup

Some more info~

 

Similar to TopSecrets setup.

 

http://www.diana.dti.ne.jp/~carplus/z33_project.htm

So does Pros Engineering

Not sure what spring rate they run though...