[DML] Re: Port and Polish
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[DML] Re: Port and Polish



As observed there is "some" merit for some amount of backpressure
caused by an exhaust system. Unfortunetly this kind of thing is only
observable by experimentation, it is impossible to accurately
calculate beforehand. It is affected by everything from the effiecincy
of the intake breathing to the camshaft, timing, etc. That is why when
you buy something from a reputable vendor they have done measurements
so you can expect certain results, not the case when you go off on
your own and fabricate your own parts. Unless you start with baseline
measurements and document and test everything you do you are "out
there all alone". That is why you pay more than just for the
fabricated parts. Testing is expensive along with some kind of
warranty. IMHO the slight gains in the exhaust are not worth the
expense and the added noise. On a long trip the noise can get to you
and increase the fatigue. The catalytic converter does a lot to quiet
the exhaust but is also a large contributer to backpressure. As for
low end power, IMHO the gearing of the trans (automatic OR 5-speed) is
not optimally designed to the PRV for the car at it's stock weight. I
am guessing now but there is probably more to be gained by changing
the gear ratios than anywhere else.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "denverdelorean" <denverdelorean@xxxx>
wrote:
> Thanks for the review!  I am a little disappointed that you lost 
> some low end tourque, but the car is a Grand Tourer, and benefits 
> from midrange power.  I think I'll hold off for a bit because if 
> anything, I want more low end power.  It doesn't help matters that 
>






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