Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Gearshift Comfort Control

Gearshift Comfort Control
The gearshift quality is controlled by way of the modulation pressure and the engine intervention function (torque reduction by retarding the ignition timing). The main pressure is constantly calculated by way of an algorithm with tuning-specific parameters (engine torque, differential speed [engine speed difference before and after shifting], output speed and constant pressure component).