1972 Dodge Colt

RTSE4ME said

All the stick racers(Coyote Stock & Pro Stick guys) I 've spoke with do not use clutch when shifting.They either lift momentarily or use a strain gauge to interrupt load off lugs.G-Force tells them shift it like its not yours, don't have to use the clutch. I would think all faceplated/dog ring trannys are similar.
A true clutchless never crosses neutral. Its always in a gear.

Click to expand...

Ths CS guys use 101a with only .5* face angles on the lugs, allows them to shift under full power without unloading. Only takes them about .043sec to cross neutral, which results in about a 200rpm flare between gears. The low angle lugs are not a problem for a drag only car, but you can't rely on them to stay in gear during casual driving.

My street/strip car has more common 7* lugs, which require unloading for the shifts. I use the clutch pedal to shift WOT, no power cut. Much bigger flare. The flare is the result of the energy produced while the trans crosses neutral getting stored in the engine's rotating assy as additional rpm, but then that stored energy gets put to work after the shift. For the typical drag racer, strain gauge shifting makes no sense to me. Why cut power anywhere between the start/finish lines if you don't need to?

Grant