I compared some before. Mine is a Windows version 3.08. Usually it's within 10% and the curves correlate fairly well. Although alot depends on how accurate your inputs are.
Where mine misses is that it doesn't distinguish the RPM intakes from normal dual planes.
I use EA 2.5, a little older but still quite good. I calibrated mine to the dyno tests that I've made, and the major difference is that I set the ambient air pressure to 26.5 instead of 29.92, otherwise the desktop dyno is a little optimistic! It also shows a peakier torque curve than what I get on the real dyno, so I design my electronic emulations to have a higher rpm torque peak than I really am expecting in the real engine and mentally fill in the low points.
Where it is really good is showing the effects of tuning the intake and exhaust stack lengths, an area that is overlooked by a lot of people.
When I enter my "old" info, the results appear to be reasonable. But, when I enter my "new" info, the results seem, as mentioned above, "optimistic".
I'm going from a fairly standard 400(+.030), to pocket ported/port matched Kaufmann 60cc aluminum heads(10.44:1CR)(my pistons have a 13cc dish and are .028 below deck hieght),2.11/1.66, 1-5/8" Hookers, Edelbrock 750CFM carb and Performer intake, 220/231 w/110 degree lobe sep. Lunati cam, 1.65 roller tips, and ...thats about it.
I'd be interested to see what someone else comes up with re their Dyno software.
I'm a hobbyist. Not a professional. Don't be hatin'!
Well Greg, I plugged your info into my computer and came up with about 480+ HP at 6000 rpm. The torque curve was consistant from about 2500 through 5000 RPM. Looks like a really stout package. However, if you go with what is considered a "Max Flow" intake, your HP would jump up tremendously...to about 550!!!!!
I'm a hobbyist. Not a professional. Don't be hatin'!
My cam is as described above(not as you describe). It is not the "off the shelf" product. Not sure what the advertised duration is(info at the house), but the duration at 050 is 221/230, and lift is .454/.454.
The heads flow 260 cfm +, especially considering the additional porting to be done...and are considered the "fast burn" combustion chambers.
I think reality is somwhere between our results...and it all looks good to me.
Thanks again for your interest.
I'm a hobbyist. Not a professional. Don't be hatin'!
Dyno results from an engine with very similar specs but with Edelbrock heads (300cfm), 1 3/4" headers and a Crower cam (221/229) were right around 450 hp. I don't remember the exact number but it wasn't above 460.
