BYD Seal Performance / Excellence AWD (3.8s): Deep Dive on iTAC Torque Control, FSD Suspension & Ideal Tyre Pressures
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After 18,000 km in my 2024 BYD Seal Performance AWD (390 kW / 670 Nm) across wet Sydney commutes and spirited runs through the Royal National Park and Putty Road, I wanted to share some insights on how iTAC (Intelligence Torque Adaption Control) and the CTB (Cell-to-Body) chassis behave near the limit.
1. Why iTAC Feels So Different to Traditional Traction Control
Traditional ESC waits for a wheel slip sensor at the ABS ring, then cuts power or grabs a brake calliper — which feels clunky coming out of a wet hairpin.
On the Seal AWD, BYD reads motor rotor angle sensors directly at 10,000 times per second (100x faster than wheel-speed ABS sensors). When the front Michelin Pilot Sport EV tyres hit a wet patch under throttle:- Instead of cutting power dead, iTAC seamlessly shifts torque between the 160 kW front induction motor and 230 kW rear permanent-magnet motor (and can even apply negative regen torque to a single axle) within 50 milliseconds.
- The result: you can plant your foot exiting a damp corner and the car just squats and catapults forward with zero drama.
2. Ideal Cold Tyre Pressures (235/45R19)
The factory sticker suggests 250 kPa Front / 290 kPa Rear (36 PSI F / 42 PSI R) — which is set for full 5-passenger load + boot luggage. If you drive solo 90% of the time, 42 PSI in the rear makes the back end feel slightly bouncy over sharp expansion joints.
- Solo / 2-Up Daily Sweet Spot:
38 PSI Front (262 kPa) / 39 PSI Rear (270 kPa)Cold. Transforms the rear ride compliance while keeping steering razor-sharp!
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That tyre pressure tip (38F / 39R PSI cold) is gold! When I picked up my Seal Excellence AWD in Edinburgh, the dealer had inflated all four tyres to 43 PSI cold and it felt super firm over cobblestones. Dropping the rears to 39 PSI cold settled the FSD dampers right down.
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