P71–a Tune Up

This morning I took a trip over to Piedmont Custom Motorsports so that I could get the P71 on a dyno and have it tuned.  The modifications that I’ve done were not a lot, but they were substantial in terms of maximizing the potential of the naturally aspirated 4.6 liter V8.  The Stainless Works long-tube headers, the 2.5” Stainless Works exhaust and hi-flo cats.  The ported intake elbo from ADTR.net along with the Steeda under drive pulleys.  These all changed the potential and the guys at Piedmont Custom Motorsports put the P71 up on a dyno and did their magic.  The display says it all.

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Even with an automatic transmission this means that my horsepower and torque are right up there. Just shy of 240 hp and 280 ft/lb of torque.  Not bad.

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5 Responses to P71–a Tune Up

  1. Jeff says:

    enough to get the job done ,Jim…when you’re chasin’ bad guys …….or runnin’ from them.

    • jimsgarage says:

      I’m happy with the numbers. The torque figure is pretty impressive. Torque is what people actually feel rather than the horse power. 4.6 liters translate into 218 cubic inches so the power level is pretty good. The numbers are about what the factory said it had at the flywheel so since this is wheel horsepower, etc., given the drivetrain losses with an automatic – well, these are good numbers.

  2. Bill Beggs says:

    What’s the old saying–“Horsepower is how fast you hit the wall, torque is how far you take the wall with you”

  3. Gary Horneck says:

    Nice numbers with just some flow increase.

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