Does anyone know what primary spring has about the same enguagement as stock but with higher RPM's than stock? Rick, BBS, Bubba, Anyone?

 

if u check out aaen's site under clutches and stuff it has all that listed for their springs i know for sure, which is the same as any others so u could check there.

 

Try a search on here ,i remember Rick did some testing on a bunch of different springs.

 

Looks like yellow is the closest to stock as far as enagement goes. Look at HPD's website and look at the springs. The first number as you know is engagement pressure. The stock white is 47/136. Any spring close to the 47 will have around the same. The second number will determine the WOT rpms. The white is 136 and is designed to run around 5700 rpms with the s-55 weights. Going higher will increase the rpms, but I cant tell you exactly how much.