Jb4 map6
Start with a maps 3-5 and see if the car is ok with that boost for your fuel and altitude before changing to map 6 custom. For me i was able to start with map 5 as baseline for map 6 and work from there. But with a C400 the stock boost is like 2psi less than the 450 so you might be close to limit with map 5. Really just depends on where you live, the fuel you have to work with and the other mods.
Just log a long pull (40-100) to see how the car is behaving with the map changes. Let the car learn the trims a few miles between map and fuel changes.
Start with a maps 3-5 and see if the car is ok with that boost for your fuel and altitude before changing to map 6 custom. For me i was able to start with map 5 as baseline for map 6 and work from there. But with a C400 the stock boost is like 2psi less than the 450 so you might be close to limit with map 5. Really just depends on where you live, the fuel you have to work with and the other mods.
Just log a long pull (40-100) to see how the car is behaving with the map changes. Let the car learn the trims a few miles between map and fuel changes.






