The Ultimate 6L80 Transmission TCC Issues and Tuning | скачать в хорошем качестве

The Ultimate 6L80 Transmission TCC Issues and Tuning |

6L80 Transmission TCC Issues and Tuning** *Subject:* Troubleshooting and tuning the 6L80 transmission torque converter clutch (TCC) *Introduction:* This document provides an overview of common issues with the 6L80 transmission TCC, particularly when using aftermarket torque converters. It also covers how to use HP Tuners to address these issues. The main problems include **surging, shuddering, and slipping**, which are often caused by inconsistent quality of friction material in aftermarket converters. *Key Issues:* *Surging:* This is a back-and-forth cycling or motion, especially at light throttle. It feels like the vehicle is "cycling" and is characterized by fluctuating RPM and pressure. The throttle and RPM will often follow the surge, indicating the throttle body is reacting to the issue, not driver input. *Shuddering:* A pronounced vibration or shaking, often described as feeling like "veering off the road". It is caused by the TCC engaging and disengaging improperly and is more noticeable in front-wheel-drive vehicles. This is due to the way the powertrain and mounts are set up, which does not absorb vibration as well. *Slipping:* This occurs when engine RPM increases rapidly without a corresponding increase in vehicle speed. It is often followed by a sudden engagement, which can feel jerky. *Causes of TCC Issues:* *Aftermarket Torque Converters:* The primary cause of TCC issues is the inconsistent quality of friction material in aftermarket torque converters. The material can be improperly cured, glazed, or have incorrect specs. **Remanufactured "Dealer" Converters**: While generally more stable than aftermarket converters, remanufactured converters may still cause issues such as cycling on and off. *Glazing:* This occurs when the friction material becomes excessively smooth and polished due to heat or improper manufacturing, causing it to lose its ability to grip. *Tuning with HP Tuners:* HP Tuners software allows adjustments to various parameters to improve TCC engagement. Key adjustments include: *TCC Max Allow Pressure Table:* This table limits the pressure applied to the TCC and can be adjusted to provide consistent TCC engagement and reduce slippage. *TCC Desired Pressure Table:* Modifying the pressure tables to provide more consistent engagement. *TCC Apply Pressure Ramp:* Adjusting this setting can make the pressure application more consistent. *Zeroing out TCC Lockup in Lower Gears:* Disabling TCC engagement in gears 1-4 can prevent slippage. The TCC is most effective in 5th and 6th gear. *Shift Pressures:* Increasing the shift pressure values. *Regulator Gain and Offset:* The regulator gain is how much the solenoid increases pressure and should usually be left alone, while the offset is the point at which the solenoid starts to engage and is critical to adjust properly. If the offset is too low, the clutch will slip, and if it's too high, the vehicle will shudder. *Apply/Release Tables:* Setting the apply speeds to 45 mph and release speeds to 40 mph in 5th and 6th gear, and setting all other gears to zero. This emulates an older-style lockup. *Important Considerations* *Front-Wheel Drive (FWD) Sensitivity:* TCC issues are more noticeable in FWD vehicles because of different mounting and powertrain setups. Shuddering is more easily felt because the entire vehicle will shake. *Torque Management:* It is crucial to leave torque management enabled when tuning a 6L80 transmission. Disabling it may not improve performance and can negatively affect vehicle timing, leading to carbon buildup. *Conclusion* While HP Tuners can effectively tune out TCC issues, the underlying problem often lies in the quality of aftermarket torque converter friction material. By using HP Tuners to adjust pressure tables, offsets, and lockup parameters, a more consistent and reliable TCC operation can be achieved. #6L80 #transmission #TCC #TorqueConverter #HPtuners #tuning #troubleshooting #aftermarket #frictionmaterial #surging #shuddering #slipping #automotive #mechanic #diy #carrepair #transmissiontuning 6L80, transmission, TCC, TorqueConverter, HPtuners, tuning, troubleshooting, aftermarket, frictionmaterial, surging, shuddering, slipping, automotive, mechanic, diy, carrepair, transmissiontuning,