Tune
Direct to manufacturer
N55 verified
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xHP
xHP Stage 3 Transmission Flash
Your ZF8 deserves to shift as fast as your engine makes power.
Beginner install
SKU: XHP-ZF8-S3
$249USD
Listed atxHP· direct from manufacturer
Faster, firmer shifts — 50–70% faster actuation
Raised torque limit to match Stage 2 engine output
No more auto-upshift under hard acceleration
Rev-match on downshifts in manual mode
Flash via OBD — no TCU removal
Revertable to stock in minutes
Linked to the manufacturer · opens in a new tab · no markup
Compatible with 11 BMW N55 models. Includes F10 535i, F30 335i, F32 435i and all N55 platforms. /
The ZF 8-speed automatic in N55 BMWs is an exceptional gearbox that is artificially limited by conservative BMW TCU calibration. The xHP Stage 3 flash unlocks the gearbox's true capability: firmer, faster shifts, raised rev-match targets, raised torque limits, and the ability to hold gears longer in sport mode. On a Stage 2 build where the engine is making 350–450 WHP, the stock TCU tune slips and hesitates. xHP eliminates this. Tune is flashed via the xHP adapter over OBD — no physical TCU removal required.
Key highlights
Faster, firmer shifts — 50–70% faster actuation
Raised torque limit to match Stage 2 engine output
No more auto-upshift under hard acceleration
Rev-match on downshifts in manual mode
Flash via OBD — no TCU removal
Revertable to stock in minutes
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