Quote:
Originally Posted by Tor
I think it is highly dependable upon what the price range is.
From reading this forum for a long time, it seems the preference is following the below formulas:
Price > 2500$ => More than 6 kg/mm spring rate track setup, at least low speed compression and rebound adjustable dampers.
Price < 2500$ > 1500$ = Compromise 4 - 6 kg/mm spring rates, Usually with the higher being in the rear or equal rates. Usually combined rebound/compression adjustable.
Price < 1500$ = "Will this get me 1.5" lower?"
Which segment are you in/want to be in?
Thanks for the explanation on your choice of rates. I went with a 6 front / 5 rear setup from the second category, and was in doubt if it would kill some of the fun. So far I like it! 
It does indeed seem like it's easier to put the power down (requires more mishandling to get the rear to slide). However, with more camber up front it seems to push less than stock (e.g. driving fast on an on-ramp I would feel stock setup push sometimes).
My personal theory (pieced together from info here) would be that a high front spring rate is more important than if the rear is higher or lower. What's important, is that the front is high enough to prevent the front McPherson suspension from compressing and subsequently lose camber. I am happy with 6kg/mm and stiffer swaybar it makes for minimal body roll.
Still my personal theory, and how I experience it... A lower rear springrate makes it require more effort to slide it at low speed (like deliberately around a hairpin). It doesn't push either (at least not with more camber up front). It just puts the power down and accelerate. When there is less traction (wet) the rear will still step out as before. Of course it can still slide dry as well, but it requires deliberate action to upset the balance. |
The ZetaCRD+ MSRP at $1250, we are doing an offer at $995 delivered.
More details here:
http://www.ft86club.com/forums/showthread.php?t=104205
The good news is that it will lower the car at least 1.5", and the better news is that the car will still ride nice and perform well.
Your 6/5 springs rate isn't bad, we actually had a REALLY tough tim deciding on which one to go for.
The final candidate was either a 5/4 or a 6/5.
The 6/5 isn't bad, and the higher springs rate will help with the lack of damper travel in the suspension system that are limited by the chassis.
However, the wheel frequency was just "slightly" higher than than what we like to have on a fast road car set up.
The 5/4 is bang on perfect on the TOP end of what we like to see on a fast road car.
But it is still quite a bit lower than what the market are used to, and we will need to make a longer damper to ensure more travel, this will limit the max lowering range amount.
In the end, we took the 5/4 as the setting and designed a longer damper.
We decided that if people want to go REALLY low, there are plenty of choices on the market.
We want a good setup that can go low, but at the same time drive nice and will work well as an all rounder.
We actually made a few new parts specifically for the FR-S / BRZ ZetaCRD because it wasn't something that was widely available.
But we are really happy with the new setup, and I am sure many others will be also.
Jerrick