streetdyno software

[xxalexx at ix.netcom.com]

> OK, I haven't tried StreeDyno yet, but I have been using HomeDyno and
> I can verify that it's right on.  I've got some charts to show the
> results on http://www.inficad.com/~houlster/Amigo/Turbo/dynoruns.htm
> 
> Specifically, I've charted the HomeDyno with the chassis dyno (done
> by ProDyno in Temp, AZ) results and they're just about right on.
> http://www.inficad.com/~houlster/Amigo/Turbo/Images/dyno_preturbo_home_pro_composite.jpg
> 
> One caveat is that HomeDyno can only plot out to about 5000 rpm with
> my recordings.  I'm not sure why, but I'm guessing that there's enough
> noise that it confuses it at that rpm.  The voltage divider method of
> StreetDyno might work better in that respect.  I only make runs to 5500
> so I'm not too worried about it.
> 
> It could also be the inductive sensor I wired up as it doesn't seem to
> be a common problem.
> 
> The point?  This is all just basic physics.  You have to know your weight
> and gearing and guess pretty good at things like frontal area and drag
> coeffiecient for this to be accurate.  If you've got a chassis dyno 
> plot to compare against, it's pretty easy to figure the unknowns in.
> 
> I can only imagine that StreetDyno is capable of the same accuracy as
> HomeDyno.
Would it help to calculate the road load HP by coast down?
These results 55 to 45 can be found in IM240 lookup table you can
down load(large) at EPA web site.  There is also a frontal area 
roadload HP correction formula in Code of Federal Register used for 
testing.
alex