openinverter forum

Hi All,

After 3 years my Tesla Cobra is now road legal (2024 plate) and I now need to get it running as well as possible.

The car has Performance LDU, 12 x 5.3 KW Tesla Modules, Orion BMS 2 and CCS.

I would be really grateful for any advice on parameters. I am very much a mechanical engineer so some of the terminology is a bit vague to me. The car drives nicely but has no regen (i'd like some). I'm happy to sacrifice a small amount of performance for durability.

I have copied my parameters below and very grateful if anyone could let me know if there are any obvious issues.

Thanks in advance.

"boost": 1800,
"fweak": 260,
"fweakstrt": 400,
"fconst": 450,
"udcnom": 0,
"fslipmin": 0.87,
"fslipmax": 3.09,
"fslipconstmax": 9,
"sincosofs": 2048,
"fmax": 540,
"dirchrpm": 100,
"dirmode": 1,
"ocurlim": 2500,
"udcgain": 6.06,
"potmin": 1539,
"potmax": 4095,
"pot2min": 4095,
"pot2max": 4095,
"potmode": 0,
"throtramp": 5.84,
"throtramprpm": 20000,
"ampmin": 0.34,
"slipstart": 55,
"sinecurve": 0,
"throtfilter": 4,
"brakeregen": 0,
"regenramp": 3,
"regentravel": 10,
"offthrotregen": -20,
"cruiseregen": -30,
"regenrampstr": 40,
"brklightout": -10,
"bmslimhigh": 100,
"bmslimlow": -20,
"udcmin": 230,
"udcmax": 426,
"idcmax": 5000,
"idcmin": -5000,
"idckp": 2,
"idcflt": 9,
"tmphsmax": 85,
"tmpmmax": 300,
"throtmax": 100,
"throtmin": -100,
"iacmax": 5000,
"ifltrise": 10,
"ifltfall": 0,
"chargemode": 0,
"chargecur": 0,
"chargekp": 80,
"chargeki": 10,
"chargeflt": 8,
"chargepwmin": 0,
"chargepwmax": 90,
"idlespeed": 250,
"idlethrotlim": 50,
"idlemode": 3,
"holdkp": -0.25,
"speedkp": 0.09,
"speedflt": 5,
"cruisemode": 0,
"udcsw": 230,
"udcswbuck": 540,
"tripmode": 1,
"bootprec": 0,
"pwmfunc": 0,
"pwmgain": 100,
"pwmofs": 0,
"canspeed": 2,
"canperiod": 1,
"nodeid": 1,
"manualstart": 0,
"fslipspnt": 1.34,
"ampnom": 0.65

A few notes:

The parameters controlling power/launch look to be within normal ranges, all good there - you can likely get a bit more punch with a lower fweak but that is a bit of salt-to-taste.

For regen, right now you have brakeregen=0 which means no regen with the brake pedal, and regen ramp is very low too. I would start by increasing each of them.

I've found regen on the LDUs to be very sensitive to small changes, so I would take a look at some of the established parameter sets/threads for good starting points. As a warning, the LDU is capable of immense amounts of regen. I would definitely go find a parking lot to make tweaks in, rather than try to do it during street driving.

The regen section of the parameters wiki https://openinverter.org/wiki/Parameters is pretty explanatory, but if you have questions about specific parameters, I can probably help explain.