Quote:
Originally Posted by Tim86UK
Thanks Jerrick,
Those are some nice looking coils!
Also i'm assuming that height is independently adjustable? i.e adjustment of ride height by adjusting the case length, without changing the damper stroke length and/or spring pre-load? Can you confirm?
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Thank you, they are pretty looking aren't they.
The locking collars system on the coilovers are also unique to MeisterR, and is currently under UK patent pending status.
You are correct, the ride height is adjusted via the lower bracket.
So ride height do not change the damper stroke ratio / spring pre-load.
Quote:
Originally Posted by Tim86UK
Interesting to see that spring rate is on the lower end of the spectrum, with the likes of kw and tein being around 6k. Curious as to why they are designed this way?
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This get a little bit more technical.
The springs rate of the MeisterR ZetaCRD+ came out to 5/4 is because of vehicle dynamic calculation that we do.
Believe it or not, the 5/4 setup is actually on the "top end" of what we like to see on a "Fast Road" car.
If you look at the wheel frequency (the measurement of springs rate at the wheel if you will), the 5/4 setup is stiffer than what OEM Porsche put on their cars.
The reason that the rear is softer is because there are two condition we want to include when designing springs rate for fast road car.
1. We want the drive wheel to have the lower wheel frequency, so in this case the rear will be more stable at the limit.
2. We want to make sure that the front and rear wheel frequency have a "gap", so the suspension do not hit a "harmonic" frequency which is a bad thing.
On the GT86, when you are on the low end of springs rate like ours, 5/5 setup was a bit too close between the front and the rear so you could hit a harmonic frequency.
The choice was either 5/4, or 6/5 under our calculation.
So opted for the 5/4 in the end because it suit the need of a fast road & track car better.
We are also developing a more race focused setup, and that will run a 8/8 setup.
The reason for that is because as you get higher up in the springs rate, that "gap" between the front and rear grows wider.
At the 8/8 setting, the spring rate are still close, but the gap is wide enough that it is acceptable.
The rear is still softer than the front at the 8/8 setup, just like the 5/4 setup.
So we didn't pick the springs rate out of the sky, they were calculated and then back up by testing to ensure they are doing what the vehicle dynamic model say they will do.
Jerrick