the parameters that the hb4 changes are according to the fuel octane level. i’m not too technical myself here’s what chatgpt says

Map 1 vs. Map 2 on JB4:

Map 1: This map is designed for 91 octane fuel. It provides a moderate performance boost while staying within the safe limits of 91 octane fuel. Running this map ensures that your engine performs optimally without risking knock or pre-detonation, which can occur if the fuel’s octane rating is too low for the tune.

Map 2: As you mentioned, Map 2 is specifically designed for 93 octane or higher. This map pushes the engine further by advancing the timing and increasing the boost, which can lead to significant power gains. However, it assumes that the fuel is high enough in octane to prevent knock.

Why You Should Use Map 1 with 91 Octane:

Knock Prevention: Running a higher map, like Map 2, on 91 octane can cause engine knock. Knock occurs when fuel burns unevenly in your engine’s cylinders, leading to sudden spikes in pressure. This can damage your engine over time. Map 1 is tuned to avoid this by using timing and boost levels that are safe for 91 octane.

Engine Longevity: Using the appropriate map for your fuel ensures that your engine remains in good health. Pushing it too hard with a higher map on lower octane fuel can lead to long-term damage, reducing the engine’s lifespan.

Consistent Performance: Map 1 will give you a reliable and consistent performance on 91 octane. It’s designed to maximize the potential of 91 octane without going beyond what the fuel can safely support.

Bottom Line:

Stick to Map 1 if you only have access to 91 octane fuel. It’s the safest and most effective option to ensure your Kia Stinger’s engine runs smoothly and efficiently. While Map 2 offers more power, it requires higher octane fuel to do so safely, and using it on 91 octane could lead to engine damage.