Tuning Information and Common Questions

How to Measure Preload and Determine Pushrod Length: Adjust the lifter to the base circle of the cam for the valve you want to measure

Some GM vehicles are “E85 capable” but do not use a flex fuel sensor, or fuel composition sensor. A fuel composition sensor is installed in

If you are swapping to a 4l80 in a vehicle with a factory 4 speed (either 4l60, 4l65, or 4l70) consider our 4l80 swap harness. 

Why buy HP Tuners for mail order tuning? Typically the process for getting a mail order tune is to send us your stock computer and

When installing a cam, the misfire timers need to be desensitized in the tune, otherwise they will constantly roll over false misfire counts. Usually a

What does a tune do to a car or truck? The majority of LSx & LTx (Late Model GM) vehicles can benefit from tuning, even

What is an f-body? The term “fbody, f-body, f body” refers to Chevrolet Camaro and Pontiac Firebirds from 1967 until 2002. This includes first through

What is a catch can? Oil catch cans prevent oil and contaminants from being consumed by your vehicle, and also prevent build up which can

What is AFM? AFM stands for Active Fuel Management, and is also referred to as Displacement on Demand. This was offered in 2007-2018 GM applications

Note: We strongly recommend AEM 30-0334 for our Gen IV & V (CAN) customer vehicles. Often we have customers send datalogs where the wideband clearly