RETROFIT AND AFTERMARKET: Independent real-world testing for retrofit systems, software updates and aftermarket technologies
Independent evidence for solutions that promise cleaner performance
Retrofit devices and aftermarket emissions technologies often operate in environments far more varied and demanding than the conditions used to validate them. Factors like temperature swings, duty cycles, ageing, installation quality and machine-specific behaviours can dramatically alter real-world performance.
Our portable emissions measurement systems (PEMS) capture second-by-second data under genuine operating conditions, giving manufacturers, regulators and operators clear, independent evidence of what a retrofit technology actually delivers.
It’s an objective assessment designed to build confidence and credibility.
Why independent validation is essential
Retrofit and aftermarket solutions must prove they work consistently in the real world, not just in a controlled setup.
PEMS testing helps you:
Demonstrate effectiveness for certification or approval
Validate long-term performance and durability
Identify installation or integration issues early
Compare performance across different vehicle or machinery platforms
Support customer confidence and programme rollouts
Provide evidence for regulatory or environmental schemes
Quantify the impact of software or calibration updates
Our independence ensures the data stands up to scrutiny.
Technologies we test
Exhaust Aftertreatment Systems
Diesel Particulate Filters (DPF)
Selective Catalytic Reduction (SCR) kits
Combination systems (DPF + SCR)
Software and Calibration Updates
Revised calibrations
Emissions reduction software
Idle or cold-start management strategies
Alternative Fuel and Combustion Solutions
Biodiesel and renewable diesel blends
E-fuels
H₂-combustion retrofit concepts
Hybrid and Electrification Retrofits
Engine-off strategies
Energy recovery systems
Idle reduction technologies
Other Retrofit Devices
Any system marketed as reducing emissions, improving fuel efficiency or enhancing combustion.
Typical retrofit evaluations include:
Pre- and post-installation PEMS testing
Controlled comparison with baseline engine behaviour
Data collection across cold, hot, high-load and transient events
Assessment of PN, NOx, CO₂, CO and other relevant pollutants
Evaluation of regeneration performance (where applicable)
Clear reporting with independent conclusions and recommendations
Optional services:
Long-term ageing and durability monitoring
Multi-vehicle comparative analysis
Cold climate and high-temperature stress testing
Fleet-wide evaluation programmes
Testing across real operating conditions
We deploy PEMS across a range of environments to ensure retrofit technologies are assessed under true working conditions:
Urban, suburban and motorway routes
Construction sites, agricultural fields and industrial environments
High-altitude locations
Extreme cold or hot climates
If your customers operate there, we can test there.
Who we work with
Retrofit manufacturers
Technology developers
Compliance teams and regulators
Municipal fleets and operators
OEMs validating third-party devices
Research organisations
We provide the independent evidence needed for programmes to launch confidently and withstand detailed scrutiny.
Upcoming conferences
Ready to scope your next PEMS project?
Get in touch to arrange a short consultation with our team. We can help define the right test routes, regulatory framework and equipment package for your programme.