08/19/2026
More clutch testing on HD11!!
Here’s some Draggy data that shows just how fine the line can be between too much weight and not enough weight.
Baseline – QSC low-engagement setup
0–60: 19.34 sec
Distance: 1,188 ft
This setup generated quite a bit of clutch heat and belt dust.
Almost empty weights
Set screws in every hole except one. This setup felt good in the seat of your pants and pulled right to 7,000 RPM.
0–60: 20.95 sec
Distance: 1,316 ft
Despite feeling better and hitting the RPM I wanted, it was actually 1.61 seconds slower than the baseline.
Added some weight back
Still held 7,000 RPM, but now the clutch had enough mass to shift more effectively.
0–60: 18.38 sec
Distance: 1,129 ft
Nearly 2.6 seconds quicker than the lighter setup, while also running noticeably cooler.
That’s the big takeaway: an empty weight isn't always a better weight.
You need enough weight/mass to overcome the spring, shift the clutch, and maintain belt squeeze. Go too heavy and you overshift and create heat. Go too light and the engine may hit the RPM you want, but the clutch isn't necessarily transferring that power efficiently.
Bonus belt test:
Same clutch setup, but swapped the 250-mile OEM belt for a new GBoost WBB383.
0–60: 17.84 sec
Distance: 1,098 ft
That's another 0.54 sec and 31 ft improvement just from the belt!