Hi peoples, I was wondering if any of you have used a desktop dyno program?
-Are these comparable to "real" HP figures put out on a real dyno?
-Does anyone know which is the best brand program to use? Cheers. Adam.

I think it would be cheaper to use a dyno itself. I have seen these programs for sale at around $2000USD!!!
Plus the dyno would give you real HP at your wheels where you need it. I dont think any simulation program could give you measurements like that.

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Performance Trends Destop Dyno is very accurate. U have to know the exact specs of everything on the motor needed by the program, if not your hp readings will be wrong (doh)

I have personally been using this for awhile, and getting fairly accurate results.

ps.But i jus used this as a guide to building my engines.......but actually tuning is done on the track or on a dyno.

I used Desktop Dyno 2000 for a while. I thought it was good until Feral put me onto Engine Analyser Pro.

Really, Desktop Dyno is a toy program that draws pretty graphs. There just isn't anywhere near enough inputs in desktop dyno. For example: in DD you define your intake port by selecting one from a small bunch designed to work for every type of engine. Compare this to EAP where you input port size and length, the taper ratio and half a dosen other things.

If you want a rough idea, sure use DD. If you want to really know whats going on and tune your engine so that everything is working together (cam, intake, exhaust, etc) then EAP is the G-O!

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That is the Destop Dyno i'm taking about from Performance Trends. version 3.3

the results seem very accurate, to within 4 HP, and within 500 RPM of actual engine...

Having too many variables can be a disadvantage as well, I mean, who the hell knows the taper ratio, or inlet track length, which length...the short radius, long or center etc.

they will never work as well as you think because there isn't enough adjustables.