Re: Dyno Tuning Methods
What are riding conditions?
DerekOn Fri, Apr 30, 2010 at 11:29 PM, Danny Whitfield <eco.usa@...> wrote:
My version of reality is:
In the case of a dyno, it should read actual horsepower produced under
riding conditions. No computer correction, just real power.
In the case of the Suzuki Hyabusa, a dyno run in still air will
produce much lower horsepower readings than advertised.
An actual high speed run with full ram air effect makes a very
noticeable difference in power at higher speeds.
So if you have a lot of money riding on a racing result, it would make
sense to take dyno readings with a grain of salt.
> What is reality?
> On Fri, Apr 30, 2010 at 10:41 PM, Danny Whitfield <eco.usa@...> wrote:
>> I see your point Derek, as far as the too lean adjustment is
>> concerned. But still without the amount of air that would be rammed in
>> at speed, how can the dyno run produce readings that would be close to
>> Dan Whitfield
>> > Dan,
>> > This is only an issue on a carburetor equipped engine if the float bowls are not pressurized as well. Bikes that are originally equipped with ram air have this addressed with the float bowl vents being ported to the ram air inlets. Of course, if you were developing your own ram air, you would have to sort this out.
>> > This is only an issue on an injected engine if the manifold air pressure correction table is programmed incorrectly or if the sensor fails. Of course in either case, you'll have some fundamental problems, ram air or no.
>> > Regards,
>> > Derek
>> > On Fri, Apr 30, 2010 at 10:26 AM, Danny Whitfield <eco.usa@...> wrote:
>> >> What about the absence of oncoming air (at the speed the bike is
>> >> running) to pressurise the induction system in ram air equipped bikes?
>> >> That could put you very lean on your fuel/air mix.
>> >> Dan Whitfield
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- At Wendover, Utah — Elevation: 4,291 FT (1,308 M)
This means around 110.6mm of mercury less atmospheric pressure at Bonneville compared to sea level at standard barometric pressure. With the specific gravity of mercury being 13.546, that would be a column of water in your hose of 1498mm or around 59" of water where
Standard Atmospheric Pressure = 1 atm = 101.325 kN/m2 = 101.325 kPa = 14.7 psia = 0 psig = 29.92 in Hg = 760 torr = 33.95 Ft.H2O
That is likely more delta P than you saw on your test but you have the correct idea.