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The map wouldn't be useless, but it might tip into too lean or too rich in certain scenarios with certain mods. It's one of the bits that's frustrating about modifying cars that if you do it properly, it's a huge fuck on.
Mine's the 2.0 TSI 280, the same engine as the MK7 Golf R (and other VAG cars), in nerd speak it's a 2.0 EA888 Gen 3 with the IS38 turbo. The reason mine's 280-290bhp from the factory while the Golf R is 300-310 is purely a different ECU tune, VW couldn't have an A6 sized Skoda having the same power as their flagship hot hatch.
The JB4 should theoretically allow mine to achieve the same power as a Golf R with the JB4 as it's the same unit and wiring loom for all EA888 Gen 3 models.
NurseHolliday
Nef
Ah, makes sense. I’m still planning on getting the e46 mapped at GKR, who actually put it on a dyno rather than just plug in and play preset stuff. And I’m also unlikely to actually do anything else to the engine beyond the map - I hadn’t considered the fact that the map would be useless if you change anything on the engine (despite how obvious it is).
A big part of the appeal of GKR was that they came recommended and it sounds like they offer a bit more of a bespoke service.
What engine have you got in your superb? 350 is a lot of horses!