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you can t generalize. it all depends on time available, experience, and how good it is
With a dyno and some custom maps, you can swing the cams while steadying in the dyno at various fixed rpm to find best cam timings
The quickness depends on various stuff
Then, with petrol and no ethanol, the engine is always knock limited, so a good etune can potentially reach very similar maximum performance as a dyno tune
E85 needs a dyno to find maximum ignition timing, and it helps with FI too
anyway... more time spent = the better the tune
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