[s-cars] Exhaust dyno results...

[Keith Maddock]

Igor Kessel <kbatpo at comcast.net> wrote:
> Djdawson2 at aol.com wrote:
> 
> > The car made 323hp ATW... not 1 hp more or less than with the stock system in
> > place.  The car lost 14ft/lbs of torque with open exhaust... and the curve
> > did not move appreciably in either direction.  In short... I was very surprised.
> > Hey... thanks for participating, class... now it's time for lunch.
> 
> Heh, it feels so good to be right :)
> Especially having saved all that money by not installing the loud aftermarket
> exhaust in any of my cars.
> :)

I don't know that I would be too quick to come to such a conclusion.

You're assuming the relationship is linear between the data points of 
A) Stock exhaust  (large backpressure)
B) Opeln exhaust.  (small backpressure)

That doesn't prove at all that there isn't a power/torque gain (or
loss) at some mid-point between (medium backpressure).

That's the equvalent of saying...
"Well I tried my tires with 30 psi and they had very little grip. so I
put in 50 psi and they didn't gain or lose any grip compared to 30psi.
  Therefore, having 40 psi of pressure in the tires wouldn't be an
improvement at all compared to 30 psi."

And I don't think anyone will agree with that statement!

Cheers,
Keith