[Grubby]

If the spring is too strong there will NOT be hesitation. The car will simply be low on power.

In a light car like a Cobra you can start with the lightest spring. Then if you have hesitation, work up.

I worked on one Vac Secondary Cobra that the secondaries were not opening on. The car drove fine, but didn't feel that strong. I put the lightest spring in and the secondaries opened without hesitation.

It is a cheap guess.

John