Is a LS2 a 24x or 58x Reluctor wheel? The Gen III engines (LS1/LS6/LQ4, and early LS2) came with a 24x (24 tooth) reluctor wheel while the Gen IV engines (LS7/LS3/LS9, and later LS2) were fitted with a 58x wheel to give more precise crank position data to the ECU.
When did LS go to 58x? Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. The upgrades included a 58x crank trigger wheel with the cam sensor moved to the timing chain cover.
What LS engines are 58x? All fully Gen IV engines are 58x, and all pre-Gen IV engines (whether they are fully Gen III, or partially Gen IV) are 24x, for the crank. All 24x crank sensor engines are 1x cam gear engines. All 58x engines are 4x cam gear. Many 24x engines are DBW, including the LS1, LS6, and LS4, as well as many of the Vortecs.
What is 24x crank Reluctor? The crankshaft reluctor has 24 unique pulses per 360 degrees of engine rotation that the Gen 3 PCM interprets to know engine position. This is where the “24x” terminology/saying comes from. The camshaft reluctor provides what is called the “1x” signal because it is either on or off for 360 degrees of engine rotation.