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The car goes to 215mph and then backs off to 205mph. Its like its pulsating, how how should i tune it and how should i stop it from doing that?
captainkiddit sounds like the car needs it's transmission altered a few steps higher. Move the trans setting to the right a couple spaces.
The pulsating is your transmission not able to accomadate the Horsepower. It is acting like a "governer", not allowing full us of your car's power.