the QSC I had setup ran a STM non e/b secondary helix that also required the shims between the sheaves, so it kicked out as well, about 4-5 mph even though it ran the center bearing on the primary it didn't make much difference. but if you have a lot of slack in the belt from too much shims, then it'll have little to none below 10 mph.
An improperly set up secondary (like the non engine braking style you described) will obviously not have engine braking. Once the helix back shifts it'll actually start rolling up the back side of the helix. We have a special cut helix to run with the QSC primary now that has the engine braking locked down. You can't say the QSC doesn't have engine braking down low if you're pairing it with a "non ebs" secondary. When the lack of engine braking is clearly from the "non ebs" helix you have.
Aside from that I am looking forward to this new product! Can't wait to get my hands on one for some testing.
Yes, if you are pairing a QSC to a stock secondary, the engine braking will be damn similar to stock if not a little more.
This was on a mudbike with 32 inch silverback tires, so engine braking was not needed or even wanted to slow the tires when off throttle, all they wanted was to lift the front tires up.
When I modify the Kawasaki Clutches, I fully disable all the engine braking and you get 2-3x the mileage out of the clutches and it prevents low end grooving on the sheaves. Plus you get a little better fuel mileage out of it as well. It does the same as a STM and kicks out when the spring releases. but this can be overcome by flyweight curves and low spring stall rates.
From my experience, telling people that their engine braking will be removed, sometimes strikes fear into the customer. Then they ride it, and see how manageable it is. It still decelerates the same, until the point it disengages (usually below 5-8 mph). It's not like it kicks you out into Neutral at 50 mph and you are on a roller coaster ride until you finally stop. nothing like that.
Most are concerned how well it's going to turn tires, hold up,belt reliability and overall cost But as far as engine braking... it'll have that, or you can remove it if you want to.