[ba] Re: [s-cars] 80tq: 20v Project Update, 415whp, 12.25, etc
Djdawson2 at aol.com
Djdawson2 at aol.com
Thu Nov 11 23:03:48 EST 2004
In a message dated 11/11/2004 6:42:02 PM Mountain Standard Time,
brett at cloud9.net writes:
> Most of the factors (which all affect NA engines) that go into calculating
> the correction, do not apply to turbo engines. They are temperature,
> barometric pressure, and humidity.
Sorry, but you need to go back to school. If the air is being forced in or
not, the conditions, if not standardized, do have an impact. They may have a
different impact (as a percentage), but to say they don't apply to turbo
engines is absolutely and unquestionably inaccurate. Does your car run the same on
a 100 degree day as a 30 degree day? Of course not. That means that some
sort of correction is REQUIRED to normalize the tests. Otherwise, we can just
wait for that 20 degree day, test the car "uncorrected," and claim victory
because Brett said that temp, pressure, and humidity don't matter to turbo cars.
I can appreciate your list of typical dyno tricks, but we're not quite that
stupid. There are a few of us here, interested in taking a scientific approach
to engine tuning. The "cheating" concepts that you've spoken of don't
pertain to my concept of scientific, and an exaggerated number doesn't provide me
any benefit. If you had looked at my latest graph, you'd see 72 F, 24.4 in Hg,
and 7% humidity... all very reasonable, no tampering.
Seems like some of you think there is a conspiracy theory WRT dyno testing by
us Denver folks. Well, there isn't a conspiracy, more likely an interest in
finding what correction is reasonable... and one is required. Anyone claiming
that there is no difference between uncorrected power at altitude vs.
uncorrected at sea level just because there's a turbo involved, needs to revisit
To satisfy my curiosity, I'll go to a sea level dyno and see just exactly
what the difference is... but I'm going to guess someone will still "cry foul."
BTW, I'm not interested in confrontational speculation, just real results.
So don't take my comments personally. However, don't just throw "stuff" out
there as fact, that simply isn't fact. The conditions surrounding the test
ALWAYS have an impact, and to claim that they don't, is ignorant.
Remember, I'm in this for the fun... so let's have fun, damn it!
Dave in OH, today
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