Can I install a cam in an LS without getting a tune?
No — a cam is one of the changes that always needs a tune.
- Why: LSX Magazine counts a cam among the changes that alter airflow enough that the stock fuel and timing data are wrong. A bigger cam lowers volumetric efficiency at low rpm and raises it up top, so idle and part-throttle fueling are off.
- What gets adjusted: idle speed and idle airflow, fueling (VE/MAF), spark, torque modeling and other drivability tables — not just one setting.
- Idle: a stock cam idles around 525–600 rpm; a performance cam typically wants about 750–850 rpm.
See cam tuning.
Want to do it yourself? See who tunes it, and how to learn.
Confidence: medium — sources disagree or are limited; check the sources below.
Related questions
- Why would VATS and starter checks refuse to disable on an E38 ECM even after a Write Entire?
- What is the exact procedure to disable DoD/AFM in the tune without a mechanical delete kit?
- How do I set up 6L80E part-throttle and WOT shift tables after a gear and tire change in an engine swap?
- How do I add a real flex fuel sensor to an E38 Camaro and dial in E85 — what needs adjusting beyond enabling multifuel?
- What is needed to segment-swap a 4L60e E38/T42 truck to a 4L80E?
- Does simply selecting 4L80E under the transmission tab convert a 4L60E tune, or is a segment swap required?
Sources
- DOD, AFM, And DFM Deletes: A Q&A With Michigan Motorsports — LSX Magazine
- LS Tuning For Optimum Performance — LSX Magazine
- Project Corn Star: Tuning An LS For Boost With HP Tuners — LSX Magazine
- LS Idle Tuning Basics With HP Tuners — High Performance Academy