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Off-Highway Tuning:
off-highway and competition tuning

Legal disclaimer: The off-highway and competition tuning services described on this page 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.

The direct answer: Off-Highway Tuning is a family of ECM tuning programs reserved for vehicles not registered for on-road use, delivering performance levels impossible in an on-road configuration.

Reserved for off-highway vehicles, this family of tuning programs notably enables the software removal of emissions after-treatment equipment. Combined with the replacement of strategic parts (turbochargers, manifolds, camshafts from the Big Boss® line), these tunes allow engines to easily exceed 1,000 horsepower for competition.

Diesel Spec has offered these services for decades for drag racing, truck pulls, closed-course racing and specialized off-highway applications, across Canada.

Contact us for an estimate

What Off-Highway Tuning covers

Off-highway tuning
and competition configurations

Off-highway tunes offered

  • EGR valve delete (exhaust gas recirculation)
  • CGI valve delete (Clean Gas Induction, Caterpillar engines)
  • Diesel particulate filter (DPF) delete
  • Variable geometry turbocharger (VGT / VNT) delete
  • Urea (SCR) system delete (DEF)
  • VVA system delete (Variable Valve Actuation, Caterpillar)
  • Speed limiter and RPM limiter removal
  • Twin-to-Single turbo conversion (Caterpillar C13 and C15)

Competition section: built for racing

  • Caterpillar: 40 PIN and 70 PIN ECMs up to 3,500 RPM, 120 PIN at 2,300 RPM
  • Cummins: ISX CM570, CM870, CM871, CM2250
  • Detroit: DDEC 3, DDEC 4 and DDEC 5
  • Tunes designed for drag racing and truck pulls

Competition engines tuned by the team behind the most powerful truck in Canada: over 2,500 measured horsepower.

A competition project or an off-highway application?

Contact us for an estimate
Multi-brand expertise

Brands covered
in Off-Highway

See the brand pages for details on models and services offered.

CaterpillarC7 to C15, DPF, CGI and VVA deletes and Twin-to-Single conversions
CumminsISB, ISC, ISL, ISM, ISX and B, L, X GHG17 series
Detroit DieselDDEC 4 to DDEC 6, DD13, DD15, DD16 (GHG14 and GHG17)
MercedesMBE900 and MBE4000
PaccarPX-6 to PX-9, MX10, MX13
MaxxForceformerly International: MF-5 to MF-15 and DT series
Across Canada

Off-highway tuning done remotely

  • Most off-highway tunes done remotelyPerformed with the DSI tool, no travel required.
  • No ECM module shippingNo more week-long wait times.
  • About 1 hourOnce the equipment is received, the tune is completed quickly.
  • Time and shipping savingsLess downtime, across Canada.

The DSI remote tuning tool performs most off-highway tunes without shipping the ECM module, in about one hour, anywhere in Canada.

Frequently asked questions

Frequently asked questions about
Off-Highway Tuning

What is Off-Highway Tuning?
A family of ECM tuning programs reserved for vehicles not registered for on-road use: competition, closed-course racing and off-highway applications. It can include the software removal of emissions after-treatment equipment (EGR, DPF, urea/SCR, VGT, CGI, VVA).
Is Off-Highway Tuning legal?
It is strictly reserved for vehicles not registered for on-road operation, used off-highway or in closed-course racing. These modifications may not comply with the regulations applicable to on-road vehicles in your jurisdiction. Complying with local laws is the customer’s responsibility.
How much power can an engine reach in competition configuration?
With Competition tuning and Big Boss® high-performance parts (turbos, manifolds, camshafts), engines easily exceed 1,000 horsepower. The record for a Diesel Spec customer: over 2,500 horsepower on a Detroit Diesel.
Can off-highway tuning be done remotely?
Yes. Most off-highway tunes can be performed remotely with the DSI tool, in about 1 hour, without shipping the ECM module.
How much does this service cost at Diesel Spec?
Costs vary by brand, engine model and dealer. All estimates are provided by phone at 1-855-932-0060 or through our contact form. An expert calls you back within 24 hours.
Reminder: these services are intended exclusively for vehicles not registered for on-road use (off-highway / closed-course racing use). It is the customer’s responsibility to comply with applicable local regulations.
Ready to take action?

Talk to a Diesel Spec expert

Tuning and parts configuration tailored to your competition or off-highway goal. Response within 24 hours.

Contact us for an estimate 1-855-932-0060
Contact form

Talk to a DSI expert

Documentation, a call back from an advisor, an estimate for your off-highway or competition project. An expert will contact you within 24 hours.

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