Owners are seeking ECU remapping and EGR removal/modification for improved performance, fuel economy, and to address perceived engine design flaws. Concerns include warranty implications, legality, morality, and potential negative impacts on engine components. Some experience hesitation after EGR is fully closed. Some owners have experience increased coolant temperatures when towing uphill.
Solution
- ECU Remapping: Several owners have had their ECUs remapped by various tuners (Agri Tune, Infinitech Tuning, SVS) to increase power and torque, improve fuel economy, and disable/modify the EGR system. Most tuners plug into the ECU rather than opening.
- EGR Modification/Removal: Some owners have opted for EGR removal via tuning or blanking plates (full block or 7mm hole). Some have experienced overboost with full blanking plates. One user found a 10% EGR opening eliminated hesitation after a remap with initial EGR closure.
- Consider a Scan Gauge: Towing requires keeping an eye on coolant temperatures
Parts
- EGR Blanking Plates: Full blanking plates or plates with a 7mm hole.
- 3" Exhaust Systems: Some owners have installed 3" exhaust systems, but some report a loss of low-end torque.
- Catch Can: Mentioned as part of a package with exhaust upgrade.
- Boost Pressure Module Filter: Small white MAP filter should be replaced if cracked or blocked.
- BFG (Tyres): 65 series BFG tires are used by one owner.
Performance Gains
- Power/Torque Increase: Tuners claim gains of 33% more power and 37% more torque. One tuner (Infinitechtuning) claims gains of 50 Bhp and 120+ Nm of torque at the tires (33 inch).
- Fuel Economy: Some owners report fuel savings of 100-200 km per tank. One owner reports a 11/100kms avg.
- EGT Temperatures: Generally reported as remaining unchanged, but not consistently monitored.
Potential Issues
- Warranty Voidance: Toyota service may reset the ECU to factory settings if the vehicle is serviced there.
- Overboost: Full EGR blanking plates can cause boost spikes in some vehicles.
- Hesitation: A slight hesitation can occur after remapping with the EGR completely turned off; a small EGR opening may resolve this.
- Gearbox Confusion: One user had issues with gearbox shifting after a remap.
- Coolant Temperature: Increased coolant temperature, resolved by dropping to 5th gear.
This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation
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