LT4 Supercharger Boost Calculator

Curious about what changing your upper and lower pulleys will do to your boost levels on your 1.7L LT4 supercharger? Use the following boost calculator/estimator as a rough guide to see how to right-size your boost for your desired power level.

The 1.7L LT4 supercharger came stock in the 3rd-gen CTS-V, 6th-gen Camaro ZL1 and the C7 Corvette Z06 and is becoming a popular addition to both modern and resto-mod LT motors.

Note that boost levels depend on a variety of variables (including temperature and humidity) and this is simply an estimate based on a linear math relationship between stock boost and upper/lower pulley adjustment. This calculation assumes NO OTHER MODS beyond pulleys. Any pulley changes will require a tuner to get the most of our your aftermarket mods.

We recommend LT4 GripTec upper pulleys.

Quick FAQ

Q: What's the stock boost level of the LT4 blower? A: ~9 PSI

Q: What's the stock LT4 blower size? A: 1.7L

Q: What's the stock LT4 upper pulley diameter? A: 3.2"

Q: What's the stock LT4 lower pulley diameter? A: 7.9"