Salsbury Clutch System
The driven has a small effect on the shift point but not a lot. The main thing that controls the shift is the weight of the rollers. The lighter the rollers the higher the shift and the more the rollers weight the sooner the shift. The springs in the driver only effect stall not the shift point. I went from 27 gram fingers to 35 gram fingers and lowered the shift from 8800 to about 8100. In you case check which roller set you are running and go lighter. No matter what you do with the clutch you need the motor to be able to turn the rpm you want. Let us know what your running for a motor and what rollers you have in the clutch and I am sure people on here can help you.
Yes tighter will make the driven shift at a higher rpm. There's not any thing that will tell you if you move it one hole how much it will change. It's all affected by the clutch and the weight of the vehicle. Some time if you up the stall it will up the shift rpm. What spring, roller's do you have in it. And what ET are you running?
We had one dragster that the motor just would not go any higher on the shifts no mater how tight the driven was. The JRE 7” works great for adjusting the shift point as you can change the helix and the spring rate.
