1991-1992 Wallace Environmental Wetl Testarossa 4.9L

Overview

The Wallace Environmental Wetl Testarossa represents a unique chapter in the history of specialized automotive engineering during the early 1990s. Emerging as a bespoke modification and refinement project based on the iconic Ferrari Testarossa platform, the “Wetl” designation refers to specific environmental and performance tuning initiatives undertaken by Wallace Environmental. These vehicles were engineered to address the stringent emissions and performance standards of the era while maintaining the visceral, high-revving character of the legendary Italian 12-cylinder engine. By optimizing the fuel delivery and exhaust systems, Wallace Environmental sought to bridge the gap between exotic performance and the evolving regulatory landscape of the North American market.

Positioned as a high-end grand tourer for the discerning enthusiast, the Wetl Testarossa retained the dramatic, wide-stanced aesthetic that defined the late 20th-century supercar era. The vehicle utilized the classic 4.9-liter flat-12 engine, a masterpiece of mechanical complexity that provided the signature soundtrack and linear power delivery synonymous with the Maranello-derived architecture. Its engineering significance lies in its attempt to modernize the drivability of the Testarossa, making it more compliant for daily use without sacrificing the raw, rear-wheel-drive dynamics that defined its heritage. Today, these vehicles are considered rare collector’s items, prized for their historical curiosity and the specific mechanical refinements that distinguish them from standard production models.

Vehicle Overview
Brand	Wallace Environmental
Model	Wetl Testarossa
Model Year	1991-1992
Generation	Testarossa (Modified)
Trim	–
Body Style	2-door Coupe
Vehicle Segment	Sports Car
Vehicle Class	Two Seaters
Market	USA
Platform	Ferrari F113
Assembly Plant	Maranello, Italy / USA
Country of Origin	Italy
Production Start	1991
Production End	1992
VIN Identifier	–
Base MSRP	–
Destination Charge	–
Total MSRP	–
Powertrain
Powertrain Type	Internal Combustion Engine
Engine Family	Ferrari F113
Engine Name	Flat-12
Engine Code	F113B
Engine Configuration	Flat-12 (180° V12)
Displacement	4.9 Liters
Bore x Stroke	82.0 mm x 78.0 mm
Compression Ratio	10.0:1
Aspiration	Naturally Aspirated
Fuel Delivery	Bosch KE-Jetronic Fuel Injection
Valve Train	DOHC, 4 valves per cylinder
Engine Block Material	Aluminum Alloy
Cylinder Head Material	Aluminum Alloy
Oil Capacity	15.0 qt
Oil Specification / Viscosity	10W-40
Horsepower	385 hp @ 6300 rpm
Torque	361 lb-ft @ 4500 rpm
Redline	7200 rpm
Drivetrain	Rear-Wheel Drive
Transmission	Manual 5-spd
Final Drive Ratio	3.44:1
Axle Ratio	–
Fuel Economy
Fuel Type	Premium Gasoline
Recommended Octane	91+
EPA City MPG	9
EPA Highway MPG	14
EPA Combined MPG	11
Fuel Economy (L/100 km)	–
Fuel Tank Capacity (gal)	30.6
Estimated Driving Range	–
Annual Fuel Cost	–
CO₂ Emissions	–
Greenhouse Gas Score	–
Smog Rating	–
Performance
0-30 mph	–
0-60 mph	5.2 s
0-100 mph	12.5 s
Quarter Mile	13.5 s
Top Speed	180 mph
Braking Distance (60-0 mph)	–
Lateral Acceleration	–
Power-to-Weight Ratio	–
Dimensions & Capacities
Length (in)	176.6
Width (Without Mirrors) (in)	77.8
Width (With Mirrors) (in)	–
Height (in)	44.5
Wheelbase (in)	100.4
Front Track (in)	59.8
Rear Track (in)	64.6
Ground Clearance (in)	–
Curb Weight (lbs)	3750
GVWR (lbs)	–
Towing Capacity (lbs)	N/A
Payload Capacity (lbs)	–
Passenger Volume (cu ft)	–
Cargo Volume (Behind Rear Seats) (cu ft)	–
Cargo Volume (Max) (cu ft)	–
Turning Circle	–
Approach Angle	–
Departure Angle	–
Breakover Angle	–
Safety Ratings
NHTSA Overall Rating	–
NHTSA Frontal Crash	–
NHTSA Side Crash	–
NHTSA Rollover	–
IIHS Award	–
Small Overlap Front	–
Moderate Overlap Front	–
Side Impact	–
Headlights Rating	–
Front Crash Prevention	–
Technology & Connectivity
Infotainment Display	None
Instrument Cluster	Analog
Apple CarPlay	No
Android Auto	No
Navigation System	No
Audio System	Factory Cassette
Speaker Count	2
Wireless Charging	No
Wi-Fi Hotspot	No
OTA Updates	No
Digital Key	No
Warranty & Ownership
Basic Warranty	–
Powertrain Warranty	–
Corrosion Warranty	–
Roadside Assistance	–
Complimentary Maintenance	–
Specs.Autos Exclusive Data
Engine Assembly Plant	Maranello, Italy
Transmission Supplier	Ferrari
Gear Ratios	–
Differential Type	Limited-Slip
Cooling System Capacity	–
Safety Recall Count	–
Production Volume	–
Units Sold in USA	–

Consumer Insights & Market Appeal

The Wallace Environmental Wetl Testarossa is a highly specialized vehicle that demands rigorous maintenance, particularly regarding its complex flat-12 engine and Bosch fuel injection system. Prospective buyers should prioritize vehicles with documented service histories, as timing belt replacements and cooling system overhauls are critical to preventing catastrophic engine failure. While its reliability is typical of 1990s Italian exotics—requiring frequent attention and specialized mechanical expertise—the car offers an unparalleled driving experience characterized by its wide-body presence and mechanical engagement. In the current collector market, these units are valued for their rarity and the unique historical context of their environmental tuning, making them a compelling, albeit high-maintenance, investment for enthusiasts of the Testarossa lineage.