When you're tuning a high-performance engine, horsepower numbers only tell part of the story.

Danny’s Mobile Emissions provides specialized Performance Tuning Emissions Testing for race cars, exotic sports cars, modified vehicles, performance engines and specialty builds.

Using professional multi-gas exhaust analysis and a controlled Two-Speed Idle (TSI) testing procedure, we measure the actual gases being produced by the engine before final catalytic-converter treatment.

This gives tuners and vehicle owners another valuable set of data for evaluating combustion quality, fuel mixture and the effectiveness of tuning changes.

Our process is simple:

Baseline Test → Fine Tuning → Re-Test → Compare Results

We come directly to your shop, garage, race facility or vehicle location.

What Is a Two-Speed Idle Emissions Test?

A Two-Speed Idle test, commonly called a TSI test, analyzes exhaust emissions while the engine operates at two controlled conditions:

Normal Engine Idle

and

Approximately 2,500 RPM at No Load

Testing the engine at both speeds provides a more complete picture than taking a single exhaust reading at idle.

The elevated-RPM portion allows us to observe the engine under a different steady-state operating condition, while the idle test provides a baseline at minimum engine speed.

For performance applications, we use this testing method as a diagnostic and tuning tool rather than a government pass/fail emissions inspection.

Why We Test Before the Catalytic Converter

A catalytic converter is designed to chemically reduce pollutants in the vehicle's exhaust.

That is excellent for controlling tailpipe emissions—but it can make it more difficult to understand exactly what is happening inside the engine during tuning.

For performance-tuning applications, Danny’s Mobile Emissions can sample the exhaust upstream of the catalytic converter where a suitable sampling location is available.

Why pre-catalyst testing matters

Testing before the catalytic converter allows us to evaluate engine-out exhaust gases before the catalytic converter changes their concentrations.

This can give your tuner a much clearer picture of how the engine itself is operating.

Instead of simply seeing what comes out of the tailpipe, we are looking more closely at the combustion process producing those gases.

Our Performance Tuning Emissions Testing Process

1. Initial Vehicle & Engine Assessment

Before testing, we discuss the vehicle configuration with the owner, mechanic, engine builder or tuner.

This can include:

• Engine configuration

• Naturally aspirated, turbocharged or supercharged setup

• Fuel type

• Aftermarket ECU or factory ECU

• Current modifications

• Exhaust configuration

• Catalytic converter configuration

• Recent engine changes

• Current tuning concerns

We then determine the appropriate exhaust sampling location and testing procedure.

2. Pre-Catalyst Baseline Emissions Test

Before additional tuning is performed, we establish a baseline emissions profile.

Where the vehicle configuration allows it, our analyzer samples exhaust gases before the catalytic converter.

The engine is tested at controlled operating conditions including:

Normal Idle

A stabilized exhaust sample is collected with the engine operating at its normal idle speed.

Elevated RPM

The engine is brought to approximately 2,500 RPM under a controlled no-load condition and readings are allowed to stabilize.

This creates a repeatable baseline that can later be compared with the vehicle after tuning.

What Do We Measure?

Depending on the vehicle and testing configuration, our multi-gas emissions equipment can analyze gases including:

Hydrocarbons — HC

Hydrocarbons can provide useful information about unburned fuel leaving the combustion chamber.

Unusual HC readings may help identify conditions involving incomplete combustion or misfire.

Carbon Monoxide — CO

Carbon monoxide is strongly influenced by combustion and air-fuel conditions.

CO measurements can provide additional information to the tuner when evaluating fuel mixture and combustion behaviour.

Carbon Dioxide — CO₂

Carbon dioxide measurements provide another indicator of combustion conditions and are useful when interpreting the overall exhaust gas profile.

Oxygen — O₂

Residual oxygen in the exhaust can provide additional information about combustion, exhaust dilution and potential air entering the exhaust system.

Additional Exhaust Gases

Depending on the testing equipment and application, additional gases may also be monitored to provide a broader emissions profile.

Rather than looking at a single measurement, we evaluate the relationship between multiple exhaust gases.

Tune the Vehicle

Once the initial emissions test has been completed, the tuner or performance shop can make the required adjustments.

These may include changes to areas such as:

• Fuel mapping

• Injector calibration

• Ignition parameters

• Idle calibration

• ECU programming

• Fuel delivery

• Engine management settings

• Performance modifications

Danny’s Mobile Emissions does not replace the vehicle's tuner or dyno operator.

Instead, we provide independent emissions data that can be used alongside the tuner's existing diagnostic and performance information.

We Come Back and Re-Test the Vehicle

This is where the service becomes especially valuable.

After the vehicle has been fine-tuned, Danny’s Mobile Emissions returns and performs the test again under comparable operating conditions.

The second test allows the before-and-after emissions results to be compared.

Before Tuning

Baseline engine-out emissions profile

After Tuning

Post-tuning emissions profile

Compare

Review how the exhaust gas readings changed following the tuning work.

Instead of relying exclusively on how the engine sounds, feels or performs, you have additional measurable information showing how the combustion characteristics changed.

Before & After Emissions Analysis

Our goal is to provide your tuner with repeatable, measurable data.

Your testing report can document readings such as:

Idle HC

2,500 RPM HC

Idle CO

2,500 RPM CO

CO₂

O₂

Engine RPM

Pre-Tuning Results

Post-Tuning Results

Difference Between Tests

This makes the service useful not only during the tuning process but also for documenting changes to a vehicle over time.

Ideal for Performance & Specialty Vehicles

Our Performance Tuning Emissions Testing service is ideal for:

Exotic Sports Cars

Ferrari
Lamborghini
McLaren
Porsche
Audi R8
Mercedes-AMG
BMW M
Corvette
Nissan GT-R
Other high-performance vehicles

Race & Track Cars

Track cars
Road-racing vehicles
Time-attack builds
Drag cars
Club racing vehicles
Performance street/track builds

Modified Street Cars

Turbocharged vehicles
Supercharged vehicles
ECU-tuned vehicles
Modified intake systems
Modified exhaust systems
Upgraded fuel systems
Performance engine builds

Engine Builders & Performance Shops

We can also work directly with:

Performance tuning shops
Engine builders
Race teams
Dyno facilities
Restoration shops
Exotic vehicle specialists
Independent mechanics
Custom fabrication shops

A Valuable Addition to Dyno Tuning

A dynamometer and an exhaust gas analyzer provide different types of information.

A dyno can measure vehicle or engine performance.

Our emissions testing provides information about the gases being produced by the combustion process at the test conditions.

Used together, these tools can give a tuner a broader understanding of what is happening with the engine.

Our Two-Speed Idle testing is a stationary, no-load emissions analysis and is not intended to replace wideband oxygen monitoring, dynamometer testing or other diagnostics performed under engine load.

Instead, it provides another layer of objective data.

Mobile Testing — We Come to Your Vehicle

You don't need to bring an exotic, race or specialty vehicle to an emissions-testing facility.

Danny’s Mobile Emissions comes to you.

Testing can be performed at:

Performance shops
Dyno facilities
Race shops
Dealerships
Private garages
Vehicle storage facilities
Collector-car facilities
Race facilities
Automotive repair shops

This is particularly convenient for vehicles that are rarely street driven, transported by trailer or stored at specialty facilities.

Performance Tuning Emissions Test Report

After testing, results can be documented so that you and your tuner can compare vehicle performance before and after adjustments.

For vehicles undergoing multiple stages of tuning, additional testing can also be performed to document the progression.

Test 1

Original Baseline

↓

Vehicle Tuned

Calibration / Adjustments

↓

Test 2

Post-Tuning Analysis

↓

Results

Before & After Comparison

Why Test Pre-Catalyst?

For normal emissions compliance testing, exhaust is typically evaluated at the vehicle's exhaust outlet according to the applicable inspection procedure.

Performance tuning has a different objective.

We want to understand what the engine is producing.

The catalytic converter can substantially change the exhaust composition before it reaches the tailpipe.

By sampling upstream of the catalyst where the vehicle provides a suitable testing location, we can obtain an engine-out emissions profile that is more useful for combustion analysis.

This gives your tuner another source of information when fine-tuning the vehicle.