Isuzu Giga vs Peterbilt 579
The Peterbilt 579 is ahead on: more power, more torque, bigger fuel tank, narrower to transport.
Below, every figure both makers publish sits side by side, with the Isuzu Giga and the Peterbilt 579 drawn to the same scale from their dimension drawings.
At a glance
Bold is the machine ahead on each figure, with its lead.
| Figure | Isuzu Giga | Peterbilt 579 |
|---|---|---|
| Gross powerHigher is better | 350 kW | 451 kW+29% |
| Max torqueHigher is better | 2,255 Nm | 2,779 Nm+23% |
| Fuel tankHigher is better | 550 L | 568 L+3% |
| Overall widthLower is better | 2.49 m | 2.388 m+4% |
All specifications
Every figure the makers publish. Search for one, or show only those that differ.
Dimensions
Overall length6.93 mNot published
Overall height (cab roof)3.2 mNot published
Wheelbase3.885 mfront axle to centre of rear bogieNot published
Tandem axle spacing1.31 mNot published
Front overhang1.4 m1.234 m
Rear overhang1.645 mfrom centre of rear bogieNot published
Front axle to back of cab0.764 m1.882 mFAX to BOC
Back of cab to rear end4.766 mNot published
Behind cab equipment to rear bogie centre2.45 mNot published
Cab height above frame2.196 m2.052 mFrom bottom of frame rail
Frame height at front0.915 mat front axle, unladenNot published
Frame height at rear1.035 mat rear axles, unladenNot published
Overall width2.49 mdimensioned on the maker's rear view2.388 mTop view, excluding mirrors
Front track2.01 mdimensioned on the maker's front viewNot published
Rear track1.85 mmaker's RT, on the rear viewNot published
Width across rear tyres2.44 mmaker's ORT, on the rear viewNot published
Turning circle14.6 mkerb to kerbNot published
Bumper to back of cab (BBC)Not published3.15 m124 in BBC; SBFA
Front of frame to front axleNot published0.795 mFOF
Cab floor height above frameNot published0.406 mFrom bottom of frame rail
Width over mirrorsNot published3.063 mFront view
Bumper to back of cab (118 in BBC variant)Not published2.997 m579-118 SBFA
Front axle to back of cab (118 in BBC variant)Not published1.732 m579-118 SBFA; FAX to BOC
Sleeper roof height above frame (44 in low roof)Not published2.126 m
Sleeper roof height above frame (58 in low roof)Not published2.172 m
Sleeper roof height above frame (58 in high roof)Not published2.586 m
Sleeper roof height above frame (72 in high roof)Not published2.586 m
Sleeper roof height above frame (80 in high roof)Not published2.637 m
Sleeper length (44 in sleeper)Not published0.914 m
Sleeper length (58 in sleeper)Not published1.219 m
Sleeper length (72 in sleeper)Not published1.6 m
Sleeper length (80 in sleeper)Not published1.753 m
Cab-to-sleeper opening height (low roof)Not published1.245 mDimension A, walkthrough opening
Cab-to-sleeper opening width (low roof)Not published1.73 mDimension B, walkthrough opening
Cab-to-sleeper opening height (high roof)Not published1.689 mDimension A, walkthrough opening
Cab-to-sleeper opening width (high roof)Not published1.73 mDimension B, walkthrough opening
Sleeper headroom (80 in UltraLoft)Not published2.438 m
Sleeper storage volume (80 in UltraLoft)Not published1.98 m³
Weight
Kerb weight7,810 kgNot published
GVW24,000 kgGVMNot published
GCW50,000 kgGCMNot published
Front axle load6,600 kgloading limit at groundNot published
Rear axle load20,865 kgloading limit at ground (tandem)Not published
Front axle capacityNot published6,622 kg
Rear axle capacityNot published20,865 kg
Front axle capacity (minimum option)Not published5,443 kg
Rear axle capacity (minimum option)Not published9,525 kg
Rear tandem axle rating (PACCAR DX-40)Not published18,144 kgTandem GAWR
Max gross combination weight (PACCAR DX-40 axle)Not published36,287 kgAxle GCW limit
Max operating weight (PACCAR MX-13 engine)Not published63,503 kg
Max operating weight (PACCAR MX-11 engine)Not published49,895 kgEngine maximum operating weight
Max gross combination weight (PACCAR TX-12 transmission)Not published49,895 kgStandard TX-12 limit
Max gross combination weight (PACCAR TX-12 PRO transmission)Not published31,751 kg
Max operating weight (PACCAR TX-18 transmission)Not published63,503 kg
Engine dry weight (PACCAR MX-13)Not published1,134 kg
Engine dry weight (PACCAR MX-11)Not published998 kg
Engine
Engine modelIsuzu 6WG1-TCC, turbocharged and intercooled, common railPACCAR MX-13, PACCAR MX-11, Cummins X15, Cummins X15N, Cummins ISX12N, Cummins L9N
EmissionsJNLT 05 / ADR 80/03 (cooled EGR + DPD)Not published
Cylinders6Not published
Displacement15.7 LNot published
Gross power350 kW (469 hp)JIS gross, at 1,800 rpm451 kW (605 hp)Cummins X15, top rating
Net power338 kW (453 hp)DIN net, at 1,800 rpmNot published
Max torque2,255 NmDIN net at 1,300 rpm; 2,334 Nm JIS gross2,779 NmCummins X15, top rating
Displacement (PACCAR MX-13)Not published12.9 L
Power (PACCAR MX-13)Not published380 kW (510 hp)
Torque (PACCAR MX-13)Not published2,508 Nm
Displacement (PACCAR MX-11)Not published10.8 L
Power (PACCAR MX-11)Not published332 kW (445 hp)
Torque (PACCAR MX-11)Not published2,305 Nm
Displacement (Cummins X15)Not published15 L
Displacement (Cummins X15N)Not published14.5 L
Power (Cummins X15N)Not published373 kW (500 hp)Maximum rating, up to 500 hp
Torque (Cummins X15N)Not published2,508 NmMaximum rating, up to 1,850 lb-ft
Displacement (Cummins ISX12N)Not published11.9 L
Power (Cummins ISX12N)Not published298 kW (400 hp)Maximum rating, up to 400 hp
Torque (Cummins ISX12N)Not published1,966 NmMaximum rating, up to 1,450 lb-ft
Displacement (Cummins L9N)Not published8.9 L
Power (Cummins L9N)Not published239 kW (320 hp)Single rating
Torque (Cummins L9N)Not published1,356 NmSingle rating
Transmission
GearboxEaton RTLO 18918B 18-speed constant mesh manualNot published
ClutchSpicer twin plate 15.5 in, air assistedNot published
TransmissionNot publishedPACCAR TX-12 PRO automated (engines up to 1,000 lb-ft, GCWR up to 70,000 lb)
Sleeper optionsNot published44 in to 80 in; 80 in UltraLoft
Transmission (PACCAR TX-12)Not published12-speed automated, on-highway fuel efficiency; 2 reverse; max engine 510 hp / 1,850 lb-ft; max GCWR 110,000 lb; system weight 657 lb (298 kg)
Transmission (PACCAR TX-12 PRO)Not published12-speed automated, extreme-duty clutch; max engine 455 hp / 1,700 lb-ft; max GCWR 70,000 lb; system weight 665 lb (302 kg)
Transmission (PACCAR TX-18)Not published18-speed automated, vocational / heavy haul; max engine 510 hp / 1,850 lb-ft; max operating weight 140,000 lb; system weight 808 lb (367 kg)
Transmission (Endurant HD)Not published12-speed automated, on-highway fuel efficiency
Transmission (Endurant XD)Not published18-speed automated, vocational, heavy haul, high performance
Transmission (Eaton FR/RT)Not publishedManual; 9, 10, 11, 13, 15 or 18 speeds
Transmission (Eaton UltraShift PLUS)Not publishedAutomated; 10, 11, 13 or 18 speeds
Drive axle ratio range (PACCAR DX-40)Not published2.47 to 3.70; 1,650 lb-ft straight torque rating, 1,850 lb-ft multi-torque rating
Axles
Rear axle ratio3.73:1Not published
Rear axlesMeritor RT-40-145GP tandem, 18,100 kg, inter-axle and cross locksNot published
Front axleMeritor FG941, 6,600 kgNot published
Rear suspensionHendrickson HAS461 airbag, 20,865 kg at groundNot published
Tyres
Tyres295/80R22.5 steer, 11R22.5 drive, 22.5 x 8.25 steel wheelsNot published
Service capacities
Fuel tank550 Lframe-mounted aluminium568 L
Performance
Top speed100 km/hspeed limited; geared 128 km/h at 1,800 rpmNot published
Capacities
Fuel tank (smallest option)Not published151 L
Fuel tank diametersNot published20 in, 23 in or 26 in
DEF tank (small)Not published38.6 L
DEF tank (medium)Not published60.9 L
DEF tank (large)Not published76.1 L
DEF tank (medium aero)Not published52.6 L
DEF tank (large aero)Not published67.8 L
Service intervals
Engine oil and filterNot published120,000 km
Fifth wheelNot published24,000 kmor monthly: inspect, grease
Axle and gearbox first-fill oilNot publishedfirst change at 3,000-5,000 mi (4,800-8,000 km); level check every 15,000 mi (24,000 km)
Sources: Isuzu Giga EXY 240-460 6x4 specification sheet ARK1422 02/21 (Isuzu Australia Limited) · Peterbilt 2024 Heavy Duty Body Builder Manual, Rev A (May 2024), Figure 3-4 Model 579-124 SBFA overall dimensions
Drawn to scale
Side views measured off each maker's dimension drawing, front edges and ground lined up.
Isuzu Giga vs Peterbilt 579: questions
Which has more power, the Isuzu Giga or Peterbilt 579?
The Peterbilt 579: Isuzu Giga 350 kW (469 hp), Peterbilt 579 451 kW (605 hp) (gross power), a 29% difference.
Which has the bigger fuel tank, the Isuzu Giga or Peterbilt 579?
The Peterbilt 579: Isuzu Giga 550 L, Peterbilt 579 568 L (fuel tank), a 3% difference.
Which is narrower to transport, the Isuzu Giga or Peterbilt 579?
The Peterbilt 579: Isuzu Giga 2.49 m, Peterbilt 579 2.388 m (overall width), a 4% difference.
Where do these figures come from?
Each model's own published spec sheet or brochure, linked under the table. Builds differ by market and year, so confirm the figures for a particular machine with its dealer.
Can I rent or buy these machines in the UAE?
Each model's page lists the ones for hire and for sale on EquipmentsFinder now, with typical prices in AED.
