How much horsepower does the LS400 have?
The LS400 delivers about 260 horsepower in its U.S.-spec form.
Across markets and model years, power outputs generally fall within the 250–270 hp range, influenced by measurement standards and local tuning.
Engine and power profile
The LS400 is powered by Lexus's 4.0-liter V8, the 1UZ-FE. This 32-valve dual-overhead-camshaft engine delivers about 260 horsepower (SAE net) in U.S.-spec models, with torque typically cited in the mid-200s pound-feet. The engine pairing emphasizes smooth, refined acceleration suited to a luxury sedan rather than outright performance.
Notes on the engine and performance
Power ratings can vary slightly by market and year due to differences in emission controls, testing standards, and tuning. The 1UZ-FE family is known for its long-lasting reliability and a broad, usable torque band that supports comfortable highway cruising.
Regional horsepower variations
Regional differences in horsepower ratings reflect distinct measurement standards (such as SAE net versus perceptual gross ratings) and local regulatory tuning. Here is a quick guide to typical figures by market and era.
- United States and Canada (1990–1997 LS400): about 260 horsepower (SAE net).
- Japan (JDM LS400, mid-1990s): roughly 270–275 horsepower depending on the rating standard used (PS vs hp) and model year.
- Europe and other markets (1990s): typically in the 260–270 horsepower range, with minor variations by emission spec.
In summary, the LS400’s horsepower rating centers around 260 hp in the U.S. market, with modest regional variations driven by measurement conventions and local tuning.
Summary
The LS400’s classic power figure sits near 260 horsepower for the U.S. specification, with international variants generally ranging from 250 to 270 horsepower depending on market-specific rating methods and regulatory tuning. This reflects a focus on smooth, refined power suitable for a luxury flagship rather than high-performance bragging rights.
