Join Date: Jul 2017
Location: Nobel Ontario Canada
Bullitt Year: 08
Bullitt Color: DHG
Bullitt Serialized Number: 4404
The problem with most chassis dynos is that they don't compensate for the full weight of the car, actual traction and wind resistence. They are basically measuring how much power it takes to spin heavy rollers. Chassis dynos also don't usually compensate for temperature, barometric pressure, or relative humidity. Therefore, they are often, shall we say, optimistic in their horsepower numbers. Whereas, an engine dyno measures the actual horsepower of the engine, under load, and any improvements are pretty reliable and repeatable.
IMHO, FP has 3 stages of performance packages for the GT and their numbers seem to be more realistic. Warranty?
Ford's three packages are 1: 13 HP/16 FT/LBS torque, 2: 21 HP/24 FT/LBS torque (both gain 40 FT/LBS in mid range. And pack 3 is 60 HP @ 7500 RPM increase 5 FT/LBS torque (No indicated mid range improvement)
With a tune only on a Bullit, I'm thinking 5% tops. So, 20-25 HP on 91 octane, at the wheels. 457 HP sounds right.
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In my defense, I was left unsupervised.
Last edited by bullit4404; 04-16-2019 at 05:04 PM.