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Stinger 3.3T AWD High-Speed Engagement

Why the Kia Stinger 3.3T AWD (95447-4J105) seems to disengage at 45 mph, holds front torque to 88 mph at WOT, and can still be engaged past 140 mph, decoded from the factory calibration and P-CAN logs.

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Kia Stinger 3.3T AWD (95447-4J105): High-Speed Engagement (45 mph vs. 88 mph vs. 140+ mph)

ROM Calibration Axes (0xC06692 75 km/h, 0xC06F96 160 km/h, 0xC06252 250 km/h) + P-CAN 0x428 WOT Telemetry

Front axle coupling torque from 0 to 155 mph at WOT in Sport and Comfort, part-throttle cruise, the 0xC061FA high-speed curve, and logged P-CAN points
WOT vs. part-throttle cruise from 0 to 155.3 mph, with logged P-CAN 0x428 WOT points.

1. Why Everyone Believes It “Fully Disengages at ~45 mph” (75 km/h = 46.6 mph)

The “disengages above 45 mph” statement from Kia's technical overview is only true during part-throttle cruising (< 40–50% pedal):

  • Part-Throttle Cruise Feed-Forward (0xC04B3C): In Eco and Comfort, every pedal column from 10% to 50% drops to 0 Nm above 50 km/h (31.1 mph).
  • Low-Speed Preload Cutoff Curve (0xC066F6 on axis 0xC06692): Multiplies low-speed launch/cornering preload by [1.00, 1.00, 0.90, 0.40, 0.30, 0.15, 0.10, 0.03, 0.00, 0.00], hitting 0.00 (complete shutoff) at 60–75 km/h (37.3–46.6 mph).
  • Low-Speed Derating Curve (0xC06170 on axis 0xC061A0): Drops [1.0, 1.0, 1.0, 1.0, 0.8, 0.6, 0.5, 0.5, 0.5, 0.0, 0.0, 0.0], hitting 0.00 at exactly 75.0 km/h (46.6 mph).
  • Confirmed in your P-CAN logs: Across more than 15,000 logged frames above 70 km/h (43.5 mph) at cruising throttle (< 40% pedal), 0x428 coupling torque is literally 0 Nm (Cruise_med = 0 Nm).

2. Why You See Forward Torque Applied Up to ~88 mph (140 km/h = 87.0 mph) at WOT

When your foot is on the floor (>= 80% WOT), the AWD module does not use the cruise shutoff. Instead, two WOT pathways stay live right through 87–88 mph:

The 140–160 km/h (87.0–99.4 mph) Dynamic WOT Split Axis (0xC06F96):

  • Axis 0xC06F96 has 5 speed breakpoints: [0.0, 20.0, 100.0, 140.0, 160.0] km/h = [0.0, 12.4, 62.1, 87.0, 99.4] mph.
  • The Dynamic Traction & Transient WOT Split maps (0xC05634..0xC056CA and 0xC057F6) command [30%, 25%, 5%, 2%, 0%] at WOT across those 5 breakpoints (and 0xC054D6 commands [12%, 12%, 12%, 5%, 0%]).
  • That means the dynamic WOT split stays non-zero right through 140.0 km/h (87.0 mph) and only tapers to 0% as you approach 160.0 km/h (99.4 mph).

Clamped Last-Row WOT Feed-Forward + Gear Torque Multiplication (0xC04B3C & 0xC04BA0):

  • Once vehicle speed passes the top breakpoint of the 10-point feed-forward table (75 km/h in Sport, 90 km/h in Comfort), C166 2D interpolation clamps to Row 9 (300 Nm at WOT in Comfort/Eco + 40–44 Nm high-speed preload 0xC06E90 = 344 Nm, or 400 Nm at WOT in Sport 0xC04BA0).
  • In your own P-CAN logs (v77_WOTPull.log, v84_Long.log, panda-20261010-022451.log) with 0.0 km/h wheel slip, watch how 0x428 coupling torque steps down with each upshift and holds flat through 3rd gear (which redlines at ~87–88 mph):
Speed RangeGearLogged Sport WOT (v77_WOTPull / 011111)Logged Comfort WOT (v84_Long / 022451)Governing ROM Table / Clamp
31 – 44 mph (50–71 km/h)1st → 2nd785 – 871 Nm692 – 854 Nm1st/2nd Gear 45% Split (0xC0585A)
46 – 62 mph (75–99 km/h)2nd Gear544 – 587 Nm512 Nm (flat)2nd Gear 40% Split (0xC0640A) / 512 Nm Clamp (0xC0732A)
62 – 88 mph (100–140 km/h)3rd Gear395 – 403 Nm (flat)344 – 347 Nm (flat)Clamped Row 9: Sport 400 Nm (0xC04BA0) / Comfort 300+44 Nm (0xC04B3C)
ROM split percentage against speed for the three gates: the low-speed cutoff hitting 0 percent by 46.6 mph, the WOT dynamic split zeroing at 99.4 mph, and the master taper flooring at 25 percent from 139.8 mph
The three ROM speed axes behind 45 mph, 88 mph and 140+ mph.

3. Why Others See It Ride Out to 140+ mph (225–250 km/h = 139.8–155.3 mph)

Inside the ROM at 0xC061FA..0xC0653D is an 11-Point High-Speed Control Block indexed by Speed Axis 0xC06252:

Axis 0xC06252 = [0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250] km/h
= [0, 15.5, 31.1, 46.6, 62.1, 77.7, 93.2, 108.7, 124.3, 139.8, 155.3] mph

Three things happen along this 0–155.3 mph axis that keep the transfer case engaged to 140+ mph:

The Master High-Speed Split Taper (0xC0640A) Floors at 25% at 139.8 mph (225 km/h), Never 0%:

  • Across [0..250 km/h], 0xC0640A tapers [45.0, 45.0, 42.5, 40.0, 37.5, 35.0, 32.5, 30.0, 27.5, 25.0, 25.0]% (and the Falling Floor 0xC064BA tapers [35.0 .. 15.0, 15.0]%).
  • At 139.8 mph (225 km/h) and 155.3 mph (250 km/h), the high-speed split ceiling still permits 25% front torque (and a 15% floor), while the Dynamic Torque Ceiling (0xC059EA Normal / 0xC05A1C Sport) still allows 700 Nm to 900 Nm.

The High-Speed Stability / Slip Preload Curve (0xC061FA) Climbs With Speed Up to 444 Nm at 155.3 mph:

Look at 0xC061FA (11 × uint16 in /16 Nm) along the 0..250 km/h axis:

  • 0–46.6 mph (0–75 km/h): 47.5 → 70.0 Nm
  • 62.1 mph (100 km/h): 85.5 Nm
  • 77.7 mph (125 km/h): 138.5 Nm
  • 93.2 mph (150 km/h): 266.0 Nm
  • 124.3 mph (200 km/h): 382.0 Nm
  • 139.8 mph (225 km/h / ~140 mph): 418.5 Nm
  • 155.3 mph (250 km/h): 444.0 Nm
Apparent wheel slip error against speed for 0.4, 1.0, 1.5 and 2.0 percent tire radius mismatches, crossing the 2.0 km/h slip gate, with the 0xC061FA torque curve on a second axis
The tire-diameter slip trap: a fixed radius mismatch grows into apparent slip as speed rises.

The “140+ mph Tire-Diameter Slip Trap” (Tab 3):

The AWD ECU assumes a fixed nominal tire radius (R_TIRE = 0x78 = 320 mm at 0xC04212) and measures wheel slip as a linear speed difference ΔV = Vrear − Vfront in km/h against the 0xC06978 slip axis (0.5 km/h deadband, 2.0 km/h ramp threshold).

Because ΔV = V × ΔR / R, any tiny front-to-rear rolling radius mismatch multiplies linearly with vehicle speed:

  • A 1.5% rolling radius difference (common with aftermarket staggered tires, slightly worn rear tires, or centrifugal tire growth of the wider rear tires at 130–150 mph) produces only 0.7 km/h of error at 30 mph (ignored).
  • At 83–88 mph (134–142 km/h), that same 1.5% mismatch crosses the 2.0 km/h slip threshold.
  • At 140 mph (225 km/h), it looks like 3.4 to 4.5+ km/h of continuous rear wheelspin, forcing the high-speed slip/stability controller (0xC061FA / 0xC05F56) to lock 380–444 Nm into the front axle all the way past 140 mph.

Related: Stinger AWD Launch Analysis, on Comfort vs. Sport launches and brake-boosting.