I just had a set of Tein SRC dynoed and wanted to share results as data are generally difficult to find - I had asked Tein NA in the past with no avail.

At 1 in/sec min rebound is abound 70 lb and max is 340 lb;
at 2 in/sec min rebound is 180, max is 420
This is a pretty good range of adjustability

Compression range is instead quite limited - about 25% between min and max
At 1 in/sec min compression is 75 lb, at 2 in/sec is 100 lb

With the same settings, there are no significant differences between the four shocks (Tein SCR are equal valving F and R) - this shows very good quality control

Spring rates were instead very inconsistent. Rated at 14 Kg/mm (@ 782 lb/in) the four springs measured between 762 and 816 lb/in.

- Sandro

 

Is this typical for aftermarket springs, or is this an unheard of wide range? Just curious...

 

Have you dynoed other springs/shocks as well? If so, can you share? I'm particularly interested in the Tein HAs.

 

The only other shocks I had dynoed were Koni 8211 (double adjust.). The compression range was much wider, like 1:2.5.

I have no other personal experience with after-market springs. However, "racing springs" rates are generally advertised to be within +/- 2%. The shop who dynoed my shocks indicated though they only find the Hypercoil springs to be within tight tolerances.

 

Do you have pics of the actual graphs of force vs speed for bump and rebound? The max and min are fairly useless, you want to see what the rates are doing in between those: linear, digressive etc.

 

I will scan the charts and post them later.

Strong digressive rebound at harder settings up to 4-5 in/sec but linear (or even slightly regressive) at softer settings; above 5 in/sec linear (good to manage strong springs) with almost the same coefficient at all settings.

Compression shows an initial regression, then immediately linear from 1 in/sec with moderatley increasing coefficients with harder settings (I should expect some bumpy ride I guess). Range of adjustability is however quite modest, if compared with your Penske or even my Koni 8211 (and missing the high speed flat curve on soft compression).

In summary, pretty good on rebound, fair on compression.

 

Chart below

 

There was a typo, sorry. On compression, I meant initial digression not regression