APR TCU UPGRADE - 7 SPEED PDK - PORSCHE 911 (991.2) (3.0T/3.8T)

MAXIMUM TRANSMISSION TORQUE CAPACITY (CLUTCH PRESSURE/CURRENT)

To prevent clutch slip as much as physically possible on the factory clutches, we’ve increased the torque capacity of the transmission to its physical limits. Too much slip can cause excessive wear and damage the clutches, especially on the smaller odd gear clutches. This can happen during gear shifts, transient response, and more, and is mostly on high powered 3.0T vehicle setups with lots of grip. Clutch pressure is configured to be dynamic and will only increase as necessary. It does not run at the maximum allowable pressure and current at all time.

OPTIMIZED WIDE OPEN THROTTLE SHIFT POINTS

The factory wide open throttle shift points were designed to match the factory output of the vehicle. With tuning, they can be optimized future to improve acceleration times. For the best results our ECU and TCU upgrade must be used together not only because the power curves may different from other tunes, but also because the ECU and TCU share information back and forth to predict the perfect timing necessary for the shift to occur. As for part throttle and light driving, we’ve kept the factory behavior in all modes untouched as we felt the driving experience was desirable as originally configured.

CLUTCH KICK / NEUTRAL BY PADDLES (CONFIGURABLE BEHAVIOR)

This is a user configurable feature at the time of flashing. When grabbing both paddle shifters at the same time, the factory behavior is to put the transmission into neutral. Grabbing them again throws the transmission back into the gear it was previously in. This is true for all except the GT series cars. Optionally you can configure the vehicle to enable our Clutch Kick option where by pulling both quickly stabs the clutch open and closed to brake the tires loose so you can practice getting the rear end for the vehicle to come out for fun sliding action!

Video demonstration below (718 shown).

CREEP MODE (CONFIGURABLE BEHAVIOR)

This is a user configurable feature at the time of flashing. Depending on model, in the first couple gears, the transmission will attempt to drive without any throttle input. This also prevents the car from rolling back on a hill to some degree, much like a transitional automatic. We give you the option to disable this behavior so the vehicle will not move unless you give it throttle input.

OPTIMIZED LAUNCH CONTROL STRATEGIES (WITH ECU CONFIGURABLE BEHAVIOR)

Depending on mode, there are several launch control strategies from the factory. We’ve focused on optimizing sport and sport plus modes and allow you to further optimized this with our ECU upgrades on some models. We’ve optimized the way the clutch engages, how much pre-stress is placed on the clutch, the amount of slip the transmission allows, the clutch engagement, launch RPM, and more.

These optimizations allowed us to greatly improve our test vehicle’s 0-60 times. However, keep in mind there are no guarantees yours will improve as it’s greatly dependent on the vehicle setup, tire selection, condition, and pressure, as well as the pavement surface conditions. Likewise, we’ve only tested our updates in combination with our ECU upgrades. On the ECU side, depending on model, we offer up to three grip modes, which are selectable at the time of flashing. They include high, medium, and low grip options. We recommend starting with medium grip, where available, and adjusting as you see fit to dial your vehicle in.

LAUNCH CONTROL ENABLED IN MORE MODES AND WITHOUT SPORT CHRONO

From the factory, the dash will only display that the vehicle is in launch control mode when the vehicle is equipped with Sport Chrono and the vehicle is in Sport Plus Mode, despite actually being activated in other modes without Sport Chrono. We reconfigure the dash so it displays in the other modes, too, and on vehicles without Sport Chrono.

AUTO UPSHIFT DISABLED

This is a popular request on other platforms, but this is enabled from the factory on the PDK.

PADDLE SHIFTER DELAY

This is a popular request on other platforms, but there is no delay when using the paddle shifters to change gears manually on the PDK from the factory. The only time a delay exists is when a driver requests multiple shifts, which is necessary.

OPTIMIZED SHIFT STRATEGIES

Depending on the vehicle mode, type of shift, braking vs accelerating, and more, the transmission will deliver different shifting strategies. We’ve smoothed part throttle / low torque situations for a comfortable normal drive while giving a more aggressive shift at full torque / high RPM for track driving purposes.

HIGH LATERAL G-FORCE SHIFT STRATEGY FIX

When turning at high G-forces and accelerating through a corner, the factory shifting behavior can be muddy and sloppy leading to a less than desirable experience and slower track times. We’ve fixed this to deliver a crisp sport shift that is smooth and keeps the car stable in the corner as well as keeping the clutch from slipping. Ultimately this results in faster track times in our experience.

PERFORMANCE NOTES

When updating the TCU, always check for and update to the latest ECU version, if available. We have only validated our TCU upgrades while using our ECU upgrades. When not using both in combination, various behaviors and features may not be predictable or as described. Even on completely new and stock vehicles the PDK exhibits inconsistencies during launch control. Our TCU upgrade does as much as physically possible to minimize this, but simply put, the PDK, on a stock or tuned vehicle, may not always launch perfectly. We recommend ensuring the gearbox temperature is at least 60c to help limit shifting irregularities, especially on the first to second gear shift during launch control.