On Thu, 3 Oct 2002, Shane Ingate wrote:
[stuff deleted]
> The Group 44 headers move the powerband significantly to higher rpm than
> other headers currently available. I suspect that the builders of the repro
> knew this, and attempted to shift the power-band to lower revs by using a
> 1 7/8" collector. I have this system, and I believe it works as intended,
> but in my mind it does negate the advantages of using 1 1/2" tubing. I do
> not have any dyno information to support this statement.
This is why some of us re-work the collector on the secondary pipes to get
2.5" pipes all the way to the back of the car.
There's nothing wrong with power at 6000 RPMs.
:-)
> On a near-stock or mild motor, I doubt if you will notice any difference in
> power over a cheaper header, but with a built motor and revised collector, I
> would expect to see significant difference on the dyno.
Au contriare! A good header on a stock motor will yield power increases,
but these turn out to be at the upper range of the power curve.
Remember a Fed. Spec TR6 is roughly 100 HP in stock form. Make it breathe
better and get rid of the fan and you're in the 120 HP range easily. The
header is probably the most important part of that equation. Throw on
Webers and a header and tuned exhaust and you can get that number into the
130 HP range.
> Shane Ingate in Maryland
rml in Boston
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