want to put a performance chip in my car, what is PSI mean?

Answer 1

Pounds per Square Inch.

Answer 2

Italian Socialist Party (Partito Socialista Italiano)
Pandemic Severity Index by Centers for Disease Control and Prevention
Paul Scherrer Institute in Villigen, Switzerland
Permanent Staff Instructor in the British Army
Permanent Subcommittee on Investigations (PSI) of the U.S. Senate
Pollutant Standards Index, an air pollution index developed by the United States Environmental Protection Agency (USEPA)
Population Services International, an international healthcare NGO based in Washington D.C.
Postpartum Support International, 501(c)3 organization devoted to women's mental health issues
pounds per square inch (psi), a unit of pressure
Professional Secretaries International
Presentence Investigation
Professors for a Strong Israel
Program Specific Information, part of the MPEG transport stream protocol. Metadata for digital transmission
Proliferation Security Initiative
PSI (computational chemistry) software
Public Services International, a global union federation of public sector trade unions
Socialist Party of the Islands (Partit Socialista de les Illes)
Statisticians In The Pharmaceutical Industry, the PSI acronym (rather than SPI) is chosen for its relation to the Greek letter Ψ, commonly used in statistical formulae.

Answer 3

Pounds per Square Inch

Answer 4

Don't chip your car before you learn SOMETHING of the physics involved. PSI is an imperial unit for pressure.

Answer 5

pounds per square inch

Answer 6

pounds per square inch.