Spring Rate of Orange Driven spring?

[RickM]

any one tell me what the spring rate is on the 09 M8 orange driven clutch spring? I have read on here where guys are increasing the spring rate of the driven. Any input on how it works, I need a couple hundred RPM in deep Powder, thinking maybe increasing rate may help? Open to comments.

 

[DonoBBD]

AS measured.

2.9" #180
2.4" #224
2.2" #241
1.63" #292
1.437"#309
1.365"#314

Don.

EDIT: may I add that the drive likes to see a narrow band rate rise. There is a doo spring that is 225/300 a 75# rise and even tighter in a cat clutch.

 

[Frostbite]

Cat's spec on the sheet I have is 175/280

Please explain "the drive likes to see a narrow band rate rise".

What exactly does that mean?