The Dieselgate Controversy and Our Investigation
At MotorVero, we acquired a 2013 Volkswagen Jetta SportWagen TDI equipped with the controversial 2.0-liter four-cylinder diesel engine to conduct a thorough, data-driven examination of its performance characteristics both before and after Volkswagen's mandated emissions system recall fix. This model sits at the epicenter of one of the automotive industry's most significant emissions scandals, making our findings particularly valuable to current owners and diesel enthusiasts alike.
Key Specifications
- Engine: 2.0L TDI Clean Diesel I4
- Factory Ratings: 140 hp @ 4,000 rpm | 236 lb-ft @ 1,750-2,500 rpm
- Transmission: 6-speed DSG automatic
- EPA Fuel Economy (original): 30 mpg city/42 mpg highway
Establishing Performance Benchmarks
Before any modifications were made to address the emissions concerns, we subjected our Jetta SportWagen TDI to rigorous testing to establish definitive performance baselines. Volkswagen representatives had cautioned that any emissions remedy might potentially affect engine performance, making these initial measurements crucial for objective comparison.
Real-World Acceleration and Fuel Efficiency
Our standardized testing protocol included:
- 0-60 mph acceleration runs using professional timing equipment
- Quarter-mile drag strip simulations
- Highway and city fuel economy loops under controlled conditions
- Engine response measurements across the entire RPM range
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Chassis Dynamometer Testing Methodology
To obtain precise power measurements, we partnered with Komet Motorsports in St. Charles, Illinois, utilizing their state-of-the-art Mustang MD-1100 chassis dynamometer. This testing approach provides several advantages:
Why Chassis Dyno Testing Matters
- Measures actual power reaching the wheels (not just crank horsepower)
- Accounts for drivetrain losses through transmission and differential
- Provides real-world performance data under load
- Allows precise before/after comparisons using identical equipment
Testing Protocol
- Vehicle brought to optimal operating temperature
- Multiple runs to establish consistency
- Correction factors applied for atmospheric conditions
- Calibration verified using known test vehicles
Pre-Recall Dyno Results
Metric | Factory Rating | Measured at Wheels | Drivetrain Loss |
---|---|---|---|
Peak Horsepower | 140 hp @ 4,000 rpm | 120 hp @ 3,480 rpm | 14.3% |
Peak Torque | 236 lb-ft @ 1,750-2,500 rpm | 202.1 lb-ft @ 2,649 rpm | 14.4% |
The TDI Driving Experience
Beyond raw numbers, the pre-recall Jetta SportWagen TDI delivered a particularly engaging driving experience characterized by:
- Immediate low-end torque: The turbocharged diesel provided strong acceleration from just above idle
- Effortless highway passing power: Minimal downshifting required for overtaking
- Remarkable fuel efficiency: Consistently achieving 38-44 mpg in mixed driving
- DSG responsiveness: The dual-clutch transmission complemented the torque curve perfectly
Volkswagen's Proposed Emissions Solutions
As part of the settlement agreement, Volkswagen outlined several potential remedies for affected TDI vehicles:
Technical Modifications
The approved emissions fix involves multiple components:
- ECU software recalibration for improved emissions control
- Potential hardware modifications to the exhaust aftertreatment system
- Revised DEF (diesel exhaust fluid) injection strategy
- Updated emissions monitoring systems
Owner Compensation Options
Volkswagen established a comprehensive compensation program:
- Vehicle buyback: Option to sell the car back to VW at pre-scandal value
- Emissions modification: Choose to have the vehicle fixed and keep driving it
- Cash payments: Additional compensation regardless of chosen path
- Extended warranties: Additional coverage for emissions components
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Anticipated Performance Impacts
Based on preliminary information from Volkswagen and automotive engineers, the emissions modifications could potentially affect:
- Peak power output: Possible reduction in maximum horsepower
- Torque delivery: Potential changes to the torque curve shape
- Throttle response: May feel less immediate at low RPMs
- Fuel economy: Possible decrease in overall efficiency
- Regeneration frequency: More frequent DPF regeneration cycles
Future Testing Plans
MotorVero remains committed to providing definitive answers about the real-world impacts of Volkswagen's emissions modifications. Our ongoing testing program includes:
- Identical dyno testing post-recall using the same equipment
- Back-to-back acceleration comparisons
- Long-term fuel economy monitoring
- Drivability assessments under various conditions
- Emissions system reliability tracking
What This Means for TDI Owners
Current owners of affected Volkswagen TDI models should consider:
- Performance priorities: If driving dynamics are crucial, consider comparative testing
- Financial implications: The buyback offer may provide unexpected value
- Long-term reliability: Modified vehicles receive extended emissions warranties
- Resale value: Both fixed and unfixed models face unique market conditions
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Conclusion
Our comprehensive pre-recall testing establishes an authoritative baseline for evaluating Volkswagen's diesel emissions modifications. While the 2013 Jetta SportWagen TDI demonstrates impressive performance and efficiency in its original state, the true test will come when we can compare these results to post-modification data. MotorVero remains uniquely positioned to deliver these critical insights to help owners make informed decisions about their affected vehicles.