Bad Timing (The most likely issue):
* Incorrect Cam Timing: A bigger camshaft requires precise valve timing. If the camshaft isn't installed correctly, the timing is off, leading to significant power loss and potentially even engine damage. This is the FIRST thing to check if your car is slower after a camshaft install.
* Incorrect Ignition Timing: A bigger camshaft often changes the engine's optimal ignition timing. The ignition timing needs to be adjusted accordingly with a timing light and potentially a tune. Incorrect ignition timing will severely impact performance.
Other Potential Problems:
* Insufficient Fuel Delivery: A bigger camshaft increases airflow, and if the fuel system can't deliver enough fuel to match the increased airflow, you'll get a lean condition. This will result in reduced power and potential engine damage.
* Insufficient Airflow: While you've likely addressed this with a bigger cam, ensure that your intake and exhaust systems can handle the increased airflow. Restrictions will choke the engine.
* Valve Spring Issues: Larger cams often require stronger valve springs to prevent valve float (valves not closing properly at high RPM). Weak springs will cause a loss of power and potentially damage the engine.
* Poor Tuning (if applicable): A bigger camshaft usually necessitates a tune (recalibration of the engine's computer) to optimize the fuel delivery, ignition timing, and other parameters. Without a proper tune, the engine will run poorly.
* Exhaust Restrictions: The exhaust system needs to be free-flowing enough to handle the extra exhaust gases produced by the bigger cam. A restrictive exhaust will cause backpressure, reducing power.
* Other Issues: Problems with the car unrelated to the camshaft install (e.g., a faulty sensor, fuel pump issues, etc.) could also contribute to the slower performance.
In short: Start by meticulously checking your cam timing and ignition timing. Ensure your fuel system and air intake/exhaust are adequate for the increased airflow. If you didn't get a professional tune, that's very likely a critical factor. If you've ruled these out, it's time to investigate other potential mechanical problems.
