Everyone runs a clutch way different and it depends on the ratios you run.
I know guys with a v twin that lock them up at 6500 and others that are higher. I like to use a clutch as a clutch and not a coupler. I'm not saying I'm right with these numbers but it is in the range I look at. I believe more in target points for RPM over time..... It will let you know if your off or on with setup and tune up.
2 cyl - 7500 or close to
4 cyl - 10,500 or close to
That would be the correct way in using the clutch. I never like it locked at the bottom of the gear for many reasons. One is how hard it hits the tire, next would be the shock it send through the transmission and third would be how much load it puts on the engine and pulls it down further and ever can make the tune up get into trouble from it. One other important thing is with how the tracks are getting prep done with trying to slow top fuel down you almost have top toe down or we spin. That has become a very big factor.
Many things and theories will be heard but all I can say is what works for one may not work for another.
They believe it will slow down Fuel classes as well as save teams money when in fact it’s costing more. When a fuel car spins the tires and hangs a valve it blows it up and on a FC launches a $40k body into space.
It also saves them money but in the end the fans loose out. Side by side becomes far and few between. We (The Racers) have been working with NHRA to get to a middle point on the prep. Sonoma was good for the bikes but we will see how the trend goes over the next few.