The torque limit normally is just over 100Nm of regen torque. I've been able to up this to about 200Nm. I've also popped the power cap on regen, letting it put in as much power as the BMS permits (basically supercharger power levels). At higher speeds the torque increase doesn't help much, but the power cap lift does significantly, since on a highway off-ramp I can see triple digit kW regen. The added torque means it can maintain higher power for longer and at slower speeds. I've actually had to tweak it over time because regen could lock the rear wheels at low speeds with high torque. Pretty much can get down to 4 MPH with just regen, and pretty quickly.
For example, if I let completely off of the throttle with regen set to max while going about 20 MPH, it feels like I mashed the brakes in the car pretty good, and I get flung into my seat belt, which locks in place during the deceleration event.
I'm actually going to be undoing quite a few of my more complex modifications temporarily, aside from the power increase modifications, because I've found a minor design flaw in my custom control hardware that I need to fix. Mainly for safety reasons, since the failure mode could cause unpredictable behavior.
