Primary spring Shims

[NewSRX'R]

I added two shims behind my primary spring. How many RPM does a shim increase engagement? Like I stated I added two and didn't se much change if any?

 

[grapeape]

Each shim should be good for 100 rpm, max of 3 shims.

 

[mopar1rules]

depends on shim thickness. you can have thicker ones or thinner ones.

 

[Whammy]

when I add shims my ppm (pumps per minute) decreases.......... added weight I guess.......