They claim to be accurate within 5%. It's a good tool, but I wouldn't trust it. Although, according to Dyno2000, the TA Stage 1 aluminum heads are worth over 100 hp as a bolt on:Brow: I'm guessing more like 60, but STILL!
I beleve if you put in all the right data you should be very close. Especialy the head flow numbers, cam timing and compression ratio.
I can offer only this.. from actual testing.. Chris's specualtion that the Alum stg 1 heads are worth 60 HP is correct.. I have built two almost identical motors, with only the heads being different.. one with 250 cfm ported iron heads, and one with the aluminum heads. The difference, equipt with the same carb and headers, was exactly 60 HP.. the only difference in the motor, was that the one that was built for the aluminum heads was a full half point higher in compression.. So just the heads alone, might only be 50 HP.. But it's no where near 100 HP.. As always, the total combo needs to be correct, to see the most value from a major component or airflow change. For those of you truely interested in a reasonably accurate computer simulation program, I suggest that you check out "Engine Analyzer Pro". Just today, since I am considering doing some different stuff with camshafts, I was searching the internet, for the info on this program, which has been reported to me as the most accurate sim program out there. But with a pricetag of almost $500 for that program, I guess I will just have to figure the overlap @.050 out on paper, since that is all I really wanted the program for. JW
Jim, Dyno 2000 will give you over lap. It also has a cam calculator. If you want too PM me the specs and I can get you what you need.
Desktop Dyno/Dragstrip predicted the best ET on my last car exactly (13.55) We discussed this at length a few years ago on George's mailing list, and the consensus was that it was pretty accurate. Of course, GIGO always applies.
