There has been a myth around saying that a very long spring is needed for delivering higher FPS. No, that is not always true. As an example, a PDI 130% spring is about an inch longer than the 140% one.
On every compression spring there are several parameters. The “free length” is the length of a spring with no load applied. “Length before set” can be thought of as near the maximum compressed length of a spring (let’s refer to this as the compressed length). The number of coils also plays a role in determining the strength of a spring. Generally speaking, the more coils a spring has the more powerful it is. However, the material that is used for producing the spring and the corresponding heat treatment process are even more critical.
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