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Old 12-30-2003, 04:06 PM
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desktop dyno 2000 = are they truthful

i guess the best people to answer this would be engine builders with a real dyno & a desktop dyno, but sense i don't know of anyone like that, anyone should feel free to give their 2 cents worth. are they anywhere near being correct? i've head within 5%, but thats still a big difference. anybody know the truth? thanks

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Old 12-30-2003, 04:25 PM
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The best thing they are used for is not actual power estemates, but the differences in power between different combos or parts. For example switching your 600cfm carb on a dual plane to a 750 on a single plane, or swapping one cam to another. Alot of info is not gathered from the user so obviously there are things that are not used in calculation.

Myself being a computer programmer and a physics student i know there is alot of info that is probably ommited or grossly simplified for such programs.
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Old 12-30-2003, 04:32 PM
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Dubz is right....although Ive compared it to engine build up aricles..& its not far off...sometimes plus some, sometimes minus some...but overall fairly close.
DD2000 & DD Dragstrip also did a pretty fair job of simulating my trucks actual performance
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Old 12-30-2003, 04:36 PM
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a good program to get is from performance trends inc
they have all kinds of programs
the engine analyzer pro is really good
you have to input a lot a good information to get a good reading
i have the program and i get a 5% differance in the outcome
with my real hp and the computers hp.
ck them out at www.performancetrends.com
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Old 12-30-2003, 04:39 PM
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Any of the programs are only as accurate as the information you enter. If you have all the accurate info they are pretty accurate.

I agree not to put all your faith in them and to use them to see what the trnd may be.
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Old 12-30-2003, 04:48 PM
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I've used Engine Analizer 3.x and found it to be closer than DD. A lot depends upon how accurate and detailed your input is.

After a recent chassis dyno, I realized the EA program was pretty accurate on net hp in my specific case. It may not be the same for others, but since I designed and built my engine, I know every spec for the proper input.

I would agree, it is most effective at comparing different combinations rather than an absolute given hp/tq number for a specific engine.
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Old 12-30-2003, 08:46 PM
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i've put in my custom flow #'s for the heads, & the custom cam, but one thing i don't know is how to get the right intake flow #'s or where to even find them for a victor jr. any body know how & where to get the #'s i need?
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Old 12-31-2003, 09:10 AM
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Talking

ive entered all the specs of my engine into my dyno 2000 program, custom airflow charts and everything and it came out at 713 Hp @ 6000 RPM and 696 ft.lb @ 4500. so i sincerely hope for the sake of my 700R4 transmission that its off by a couple of hundred horses (not to many hundred i hope.. :-) )
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Old 01-10-2004, 08:41 PM
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406 SS, I purchased the Dyno 2003 in hopes that it would be a fix for all the
information on various combinations....make selection much easier. My engine is a Ford FE and the numbers I received looked very good. The
problem was that to get the "good" numbers, the cam duration was fat
on the exhaust side by more than 20 degrees. Ve looked very good at
5200 rpm but actually was over 100% at high rpm which was not feasable
with the equipment stated. From what I have learned in hind sight is that
the programs run figures on the high side. If you can get a spec sheet
with equipment used and actual dyno results you may be able to get a
handle on how much the program is off. I ended up having a mechanical
engineer design a cam for my project, could have saved some money.
I am not saying all situations will be the same as mine but it is not a case
of "garbage in, garbage out". Good luck with your project.
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Old 01-11-2004, 06:01 AM
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i also sincerely doubt my figures, if i compare with some real life engines its off by over 100 hp.. i have volumetric efficiency of almost 110% in dyno 2000.. and although it would be nice to invent the perpetual motion machine i doubt that is the case for my engine
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Old 01-11-2004, 10:36 AM
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I had my engine dynoed at 425 hp at 5200 rpm and 470 lb ft torque at 4200 rpm. My desktop dyno showed the same torque and 450 hp at the same rpms so its pretty close. It is good for comparing different combos. The more acurate the info you imput the more acurate the results.
Steve
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Old 01-11-2004, 12:53 PM
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Ive been tinkering a bit with the numbers after i posted the first reply, and i think my combo is a little beyond the scope of the program, im running an enderle 8-stack injection, and when i input the intake flow, which is 3800cfm i think some of the algorithms get screwed up, also on such an engine stack length and resonance plays a big role, this cannot be entered, and lastly is the header and exhaust input very limited. but i was aiming for 650Hp so i might be in the ball park..

Has anyone here BTW, tested or used performance trends engine analyzer??
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Old 01-11-2004, 09:20 PM
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Kind of an off topic Question but im from the Grand Rapids MI area and I have been looking for one of these DD, for quite some time and i cant seem to find one, where to I go to buy one of these?
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Old 01-11-2004, 09:59 PM
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You can get them on EBAY. Thats where i got mine, & the price is good too.
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Old 01-12-2004, 08:36 AM
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Desk Top Dyno is a very simplistic program, but the results are good considering the limited amount of information that you have to deal with.
There are other computer simulation products available from several sources, such as Performance Trends and others. These products have a much greater scope and are probably more accurate, but the price is considerably higher ($400.00 to $800.00).
For the cost involved, DD is a good buy, but do not put too much faith in the resulting numbers.
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