The DeSoto Fireflite III Two-Door Sportsman, specifically the 1958 facelifted model equipped with the 5.9-liter V8 engine producing 305 horsepower and paired with a TorqueFlite automatic transmission, represents a pivotal moment in the final years of the DeSoto marque. Produced from 1957 to 1958, this variant occupied a significant position within the Fireflite range, offering a blend of performance and luxury aimed at the American consumer during the late 1950s. It was part of the broader Fireflite III generation, a restyling of the previous year’s model, intended to boost sales and compete with other full-size American automobiles.
Technical Specifications
| Brand | DeSoto |
| Model | Fireflite |
| Generation | Fireflite III Two-Door Sportsman (facelift 1958) |
| Type (Engine) | 5.9 V8 (305 Hp) TorqueFlite |
| Start of production | 1957 |
| End of production | 1958 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 6 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6.1 kg/Hp, 163.6 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 290.8 Nm/tonne |
| Power | 305 Hp @ 4600 rpm |
| Power per litre | 51.6 Hp/l |
| Torque | 542 Nm @ 2800 rpm, 399.76 lb.-ft. @ 2800 rpm |
| Engine displacement | 5916 cm3, 361.02 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 104.65 mm, 4.12 in. |
| Piston Stroke | 85.85 mm, 3.38 in. |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 3.8 l, 4.02 US qt | 3.34 UK qt |
| Coolant | 16.1 l, 17.01 US qt | 14.17 UK qt |
| Kerb Weight | 1864 kg, 4109.42 lbs |
| Fuel tank capacity | 87 l, 22.98 US gal | 19.14 UK gal |
| Length | 5552 mm, 218.58 in |
| Width | 1989 mm, 78.31 in |
| Height | 1450 mm, 57.09 in |
| Wheelbase | 3200 mm, 125.98 in |
| Front track | 1549 mm, 60.98 in |
| Rear (Back) track | 1516 mm, 59.69 in |
| Front overhang | 892 mm, 35.12 in |
| Rear overhang | 1461 mm, 57.52 in |
| Ride height (ground clearance) | 140 mm, 5.51 in |
| Minimum turning circle (turning diameter) | 15.1 m, 49.54 ft |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission TorqueFlite |
| Front suspension | Independent coil spring |
| Rear suspension | Leaf spring |
| Front brakes | Drum, 305 mm |
| Rear brakes | Drum, 305 mm |
| Steering type | Worm-reduction unit |
Powertrain & Engine Architecture
The heart of the 1958 Fireflite Sportsman was the DeSoto 5.9-liter (361 cubic inch) V8 engine. This engine, designated within the Chrysler corporation as the “RB” series, was a robust and relatively simple design featuring a cast iron block and aluminum cylinder heads. The 305 horsepower output was achieved through a four-barrel carburetor, a 10:1 compression ratio, and a hydraulic lifter valvetrain. The engine’s OHV (Overhead Valve) configuration was typical for American V8s of the era. The TorqueFlite automatic transmission, a three-speed unit, was a Chrysler product known for its durability and smooth shifting. It was a fully automatic transmission, meaning it didn’t require manual gear selection, contributing to the ease of driving expected by American consumers.
Driving Characteristics
The combination of the 305 hp V8 and the TorqueFlite automatic resulted in a driving experience focused on comfortable cruising and effortless acceleration. While not a sports car, the Fireflite offered ample power for highway passing and merging. The automatic transmission, while smooth, did result in some power loss compared to the available manual transmission options. The gear ratios were optimized for torque delivery at lower RPMs, making it well-suited for everyday driving. The substantial weight of the vehicle (approximately 4,109 lbs) meant that handling was not particularly nimble, but the independent front suspension did provide a reasonably comfortable ride.
Equipment & Trim Levels
The Two-Door Sportsman trim represented a mid-range offering within the Fireflite lineup. Standard features included a spacious interior with bench seats upholstered in cloth and vinyl, a full-length chrome side molding, and a distinctive grille. Power steering and power brakes were often included, though not always standard. Optional extras included air conditioning, a radio, and upgraded interior trim packages. The dashboard featured a straightforward layout with analog gauges for speed, fuel level, temperature, and amperage. The interior was designed with family comfort in mind, offering ample space for six passengers.
Chassis & Braking
The Fireflite III utilized a body-on-frame construction, typical of American cars of the period. The front suspension employed independent coil springs, while the rear suspension relied on a traditional leaf spring setup. This configuration prioritized ride comfort over handling precision. Braking was accomplished via drum brakes on all four wheels, measuring 305mm in diameter. While adequate for the time, the drum brakes lacked the stopping power of later disc brake systems. Steering was handled by a worm-reduction unit, which provided relatively heavy but direct steering feel.
Market Reception & Comparison
The 1958 DeSoto Fireflite faced stiff competition from other full-size American cars, including models from Chevrolet, Ford, and Plymouth. Critics generally praised the Fireflite’s styling and comfortable ride, but some noted its relatively high price compared to competitors. The 1.8L automatic combination was seen as a good balance between performance and convenience, appealing to buyers who prioritized ease of driving over outright speed. Fuel economy, unsurprisingly, was not a strong point, averaging around 14-16 miles per gallon. Reliability was generally good, though the carburetor could require occasional adjustment.
Legacy
The DeSoto brand was discontinued in 1961 due to declining sales and internal competition within the Chrysler Corporation. As a result, the 1958 Fireflite Sportsman represents one of the final iterations of this iconic American marque. Today, these cars are sought after by collectors and enthusiasts, particularly those interested in 1950s automotive history. The 5.9-liter V8 engine and TorqueFlite transmission are known for their durability, and well-maintained examples can still provide a reliable and enjoyable driving experience. Parts availability can be a challenge, but a dedicated community of DeSoto owners and suppliers helps to keep these classic cars on the road. The 1958 Fireflite Sportsman stands as a testament to a bygone era of American automotive design and engineering.
