OVMS User Manual page 31

OVMS: Renault Twizy User Guide 2019/05/02 RT3.9.1
But the gearbox is also specified at a maximum input speed of just 7000 rpm. That's the first oddity:
the default config of the Twizy 80 already exceeds this, as the default max speed is at 7250 rpm. So
if you're driving max speed with an unmodified Twizy, you're already outside of the manufacturer
specs.
The second oddity is that the manufacturer recommends to use an SAE gear box oil 80W90, while
Renault uses ELF Tranself TRJ 75W80 API GL5 EP.
A leaked info on this claims the Renault oil is medium quality and caused overheating during
testing, and that the oil retention ring in the gearbox is made of polyamide and will start to wear out
quickly if gearbox oil temperatures exceeds 74° Celsius.
The recommendation from the same source is to exchange the gearbox oil with a high quality
80W90 API GL5 gearbox oil with EP (extreme pressures) additives and change it every year,
especially for increased motor torque, because a non-fresh oil caused "fretting" on the gears during
testing.
While the source is unofficial, this explains most of the problems Twizy owners experienced with
the gear box, especially oil loss and noise.
Exchanging the oil is easy and has been done by many Twizy drivers with good, sometimes great
improvements on the gearbox noises. There's more info on this on the forums.
Another modification to think about is to replace the polyamide oil gasket by some better quality,
especially if you're already losing oil or if you're going to travel long distances at high speed.
Some more technical background
Current
Technical limitations apply on the battery, controller and motor current levels.
Battery current needs to be limited to ensure a long life. Lithium batteries are especially endangered
by high charging currents under low temperature conditions, this can lead to irreversable
downgrading due to plating of metallic lithium on the anode. Healthy limits for Lithium type
batteries normally are 2C continuous for discharging, 0.5C continuous for charging. 2C means 2
times the capacity of the battery. Continuous means over a time period of several minutes or hours.
Short peaks can be higher without damage, but we don't know much about the Twizy battery
capabilities here.
An AC motor will produce constant torque up to the speed (RPM), at which it's rated maximum
mechanical power output is reached. From this RPM point upwards, the current needs to be scaled
down following the speed/torque curve of the motor to not exceed the rated maximum power.
Rated stator / phase current for the motor is 175 A (rms), this can be found in the motor nameplate
SDO 0x4640.02 and the motor configuration SDO 0x4641.07. The maximum stator current
(0x4641.02, this is assumed to be the motor start current) and the overall current limit (0x6075.00)
are configured to the peak current level of the SEVCON controller type by default.
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