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? asked in Cars & TransportationCar MakesFord · 6 years ago

Crown vic going slower after mods?

So i've been doing some things to make the vic a bit faster. Stock with 3.27 and open dif I ran 15.7. Then came 3.73 with Tlok and deleted rear cats, Trickflow Plenum, Non custom tune and I ran a 15.9. Any ideas on why I ran this?

2 Answers

Relevance
  • 6 years ago

    If you changed the TB size, then you need a custom tune, the ECU is going to be way off in measuring the amount of air coming in otherwise.

  • ?
    Lv 7
    6 years ago

    Yes, the reason is you messed about with it without the first clue as to what you were actually doing.

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