[BobBoyce]

There is a solution. Unfortunately, the current Elite models of the S4 and L6 were "bastardized" by E-Z-GO to use their 51.2V (their programmed nominal voltage) version of the Samsung lithium pack developed for the RXV and TXT48 Elite models. Resulting in a 72V vehicle running from a pack that is undervoltaged for the original design voltage of the vehicle. The good news is they can be improved, while the bad news is they have desigh flaws that pop up in stock form. With the lowered voltage, they must push more current to the 3 phase AC windings in the motor to retain rotor lock (to reduce slip). This causes additional motor heating. While the speedup is possible, we need to soften accel and limit the top end in an attempt to deal with the issues caused by these design flaws. Otherwise, shutdowns occur from motor overheat in a fairly short time. The lithium pack also has a cutback point that causes what I call "porpoising", where the BMS cuts back on current, then re-applies current, repeatedly. The solution is to further reduce accel rate until it stops doing that. By limiting speed to about 27 MPH and tweaking accel, we can reach a compromise that is usually acceptable.

Bob