Headquarters · La Prairie, Québec
ECM Tuning
for heavy-duty diesel trucks,
Canada’s leader since 1987
100,000+ trucks tuned · 5 to 10% fuel savings · up to 30% more power
No parts replacement · Network of 250+ dealers across Canada.
No parts replacement
100% software-based tuning
30-day guarantee
Money-back guarantee
250+ dealers
All across Canada
6 engine brands
CAT · Cummins · Detroit · +3
Diesel Spec at a glance
Canada’s specialist
in diesel engine software
Diesel Spec Inc. (DSI) is Canada’s leader in ECM tuning (Engine Control Module) for heavy- and medium-duty diesel truck engines. Founded in 1987 in Montreal, Quebec, the company has tuned more than 100,000 trucks.
Our approach: fine-tune the software that manages fuel injection and engine parameters, with no parts replacement in most cases. The results are measured in fuel savings percentages, horsepower gained and kilometres added to your engine’s service life.
Our network of more than 250 dealers covers every Canadian province. Our multi-brand expertise (Caterpillar, Cummins, Detroit Diesel, Mercedes, Paccar, MaxxForce) makes us the only specialist able to serve virtually any Canadian fleet. We also have an Agriculture division.
Diesel Spec is not a general repair shop: we are the specialist in ECM tuning and Big Boss® performance parts. For a personalized quote, call us at 1-855-932-0060.
100k+
Trucks tuned
39
Years of expertise · since 1987
250+
Dealers across Canada
Our tuning solutions
Three service families
tailored to your needs
Whether your goal is to cut fuel costs, gain power or get a truck ready for competition, we have the right calibration for you.
Fuel Economy
Tuning
Our most requested service. Fuel savings of 5 to 10%, with no parts replacement. Complies with applicable Canadian exhaust opacity standards.
- Typical savings of 5 to 10%
- 100% ECM software
- Compliant with Canadian emission standards
Ideal for
Long-haul fleets · fleet managers
Most popular
Performance
Tuning
Up to 30% more power, with no parts replacement. In 75% of cases, the Performance calibration also improves fuel economy.
- +30% engine power
- Improved low-RPM torque
- Fuel-savings bonus in 75% of cases
Ideal for
Heavy loads · owner-operators
Off-Highway
Tuning
For competition and off-highway applications only. EGR, DPF, urea/SCR, VGT, VNT, CGI, VVA removals and Twin-to-Single conversions available.
- Competition section (drag racing, truck pulls)
- Multi-brand deletes
- Remote programming anywhere in Canada
Ideal for
Off-highway trucks · closed-course racing
Supported engine brands
6 major brands,
hundreds of ECM variants
From Caterpillar to MaxxForce, including Cummins (our widest supported range), we tune the six leading diesel engine brands on Canadian roads.
Caterpillar 3406E to C16 · Cummins ISB / ISC / ISL / ISM / ISX / QS · Detroit DDEC 3 to DDEC 13 · DD13-DD15-DD16 · Mercedes MBE900 / MBE4000 · Paccar PX-6 / PX-8 · MaxxForce MF-5 to MF-15 + MF-DT
Find your calibration
Tell us your engine and your goal: we’ll take you straight to the right solution, with the form already pre-filled.
39
YEARS of expertise since 1987
Why choose Diesel Spec
Unmatched volume and
experience in Canada.
Nearly four decades of expertise serving Canadian truckers and fleets; no Canadian competitor comes close to our volume. That experience translates into field-proven calibrations across the six leading engine brands.
100,000+ trucks tuned since 1987
Field-proven calibrations, all across Canada
Network of more than 250 dealers in Canada
A certified dealer near you, in every province
Expertise across 6 engine brands
CAT, Cummins, Detroit, Mercedes, Paccar, MaxxForce: hundreds of ECM variants
30-day money-back guarantee
On all our tuning services, everywhere in Canada
Most tuned engines
Our most requested engines
We tune hundreds of ECM variants across the 6 major diesel engine brands. Every engine has its own potential: talk to an expert to find out what yours can gain.
Big Boss® / PDI performance parts
When software isn’t enough.
For high-torque or heavy-use configurations, our Big Boss® line (by Performance Diesel Inc.) picks up where ECM tuning leaves off.
Turbo-
chargers
Stage 1 et Stage 2 · CAT · Cummins · Detroit
Exhaust
manifolds
+20% airflow · −75 to −100°F EGT
Intake
manifolds
Up to +55% clean air · Cummins ISX
Crank Dampers
+ Engine Kits
CAT · Cummins · Detroit · Master Conversion Kits
FAQ
Frequently asked questions
about ECM tuning
Everything you need to know before booking an appointment with a Diesel Spec dealer.
What is ECM tuning?
ECM tuning modifies the embedded software in the electronic control module (Engine Control Module) that manages fuel injection and engine parameters. The change is purely software-based; no parts are replaced in most cases. The results are measured in fuel savings, power gains and lower maintenance costs.
How much fuel can I expect to save?
Depending on the engine, truck usage and driving style, Fuel Economy tuning typically delivers 5 to 10% fuel savings. For a personalized quote, call us at 1-855-932-0060.
Which engine brands does Diesel Spec tune?
Six major brands supported in Canada: Caterpillar (CAT), Cummins (our widest range), Detroit Diesel, Mercedes, Paccar and MaxxForce (formerly International / Navistar engines). Each brand has its own detailed service page listing supported models.
How long does ECM tuning take?
The procedure itself takes a few hours at a Diesel Spec dealer. For customers in remote areas, our DSI tool enables complete remote tuning in about 1 hour, anywhere in Canada, without shipping the ECM module.
How much does ECM tuning cost?
Costs vary by service type (Fuel Economy, Performance, Off-Highway), engine brand, model and dealer. All quotes are provided by phone at 1-855-932-0060 or through our contact form.
Will tuning shorten my engine’s life?
No. An optimal calibration can even lower maintenance costs thanks to better combustion. Diesel Spec calibrates within the engine’s safety margins. 30-day money-back satisfaction guarantee on all our tuning services.
Does Diesel Spec offer engine repair or general mechanical services?
No. Diesel Spec specializes exclusively in ECM tuning and Big Boss® / PDI performance parts. The only mechanical work we perform is directly related to our services (kit installation, performance parts mounting, dyno calibrations).
Where is Diesel Spec located and how can I reach you?
Our headquarters are located at 200 rue Goyer, La Prairie, QC J5R 5G5 (Montreal’s South Shore). Toll-free 1-855-932-0060 · Local line 514-932-0060. To find your nearest dealer, use the “Find a dealer” button.
They trust us
The numbers speak.
Our customers share their results: precise figures, real savings, measured performance.
“I was getting 6.8 mpg with my 2009 Cummins ISX. Now I get 7.5 mpg. I should have done it long ago.”
+10% MPG
“Diesel Spec transformed my twin turbo Caterpillar. Immediate fuel savings and my power back. What more could I ask for?”
Confirmed savings
“Thanks for making my Detroit Diesel the strongest truck in Canada at over 2,500 horsepower!”
2500+ HP
Ready to get started?
Request your
personalized quote.
An expert will contact you within 24 hours.
30-day money-back guarantee.
Talk to a DSI expert
Documentation, a call back from an advisor, or a quote for your truck or fleet. An expert will contact you within 24 hours.
Off-highway calibration disclaimer
The off-highway and competition tuning services described on this site are strictly intended for off-highway / closed-course racing use on vehicles not registered for on-road operation. These modifications may not comply with the regulations in effect in your jurisdiction. It is the customer’s responsibility to comply with applicable local laws.