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Old 01-12-2016, 02:51 PM   #1
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Default ITT: We discuss Virtual Dyno settings

So I'm trying to get virtual dyno going. And to get good baseline settings I'm using actual dyno runs to compare to the logs.

The issue is, they aren't even close to accurate.

Dyno printout



Virtual Dyno, weights adjusted to get as close as I can to the right numbers.



What gives?

(Logs attached)
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ITT: We discuss Virtual Dyno settings-wqz8gka.jpg   ITT: We discuss Virtual Dyno settings-dd7feaf.png  
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File Type: msl dyno run 28.msl (230.4 KB, 73 views)
File Type: msl dyno run 15.msl (253.4 KB, 81 views)
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Old 01-12-2016, 02:59 PM   #2
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What inputs does the virtual DYNO use for its calculations?
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Old 01-12-2016, 02:59 PM   #3
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Megasquirt log
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Old 01-12-2016, 03:12 PM   #4
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Did you expect it to be accurate? AFAIK Virtual Dyno should only be used to compare against Virtual Dyno. AKA consistency rather than accuracy.
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Old 01-12-2016, 03:13 PM   #5
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I expected it to be closer than this, at least the way its used around here.
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Old 01-12-2016, 03:28 PM   #6
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I've compared it to NUMEROUS actual dynojets and it's always really really close. like 2-4hp close

and the curves are also really close. like almost identical. you can check many other forums and see that there's threads like this and all of them match up.

so you're doing something wrong
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Old 01-12-2016, 03:29 PM   #7
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do you have a 6sp in the car?
why are both car weights you're using so completely off the wall?
don't you have a 3.9 torsen?
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Old 01-12-2016, 03:29 PM   #8
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Quote:
Originally Posted by 18psi View Post
so you're doing something wrong
Thats why this thread exists. What is it?
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Old 01-12-2016, 03:29 PM   #9
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Quote:
Originally Posted by 18psi View Post
do you have a 6sp in the car?
5 speed at time of dyno
4.1 at time of dyno
weights are to try and get it to even be close. without weird weights its at like 280hp

STAHP NINJA EDITING
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Old 01-12-2016, 03:30 PM   #10
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Why is your car weight set to 1300 lbs?
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Old 01-12-2016, 03:31 PM   #11
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With correct weights:

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ITT: We discuss Virtual Dyno settings-s14tezf.png  
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Old 01-12-2016, 03:33 PM   #12
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so they were that at time of dyno and not that now?

welp.....
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Old 01-12-2016, 03:35 PM   #13
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Logs are from the dyno runs.
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Old 01-12-2016, 03:36 PM   #14
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Yikes.
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Old 01-12-2016, 03:37 PM   #15
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that's weird. I'm too busy and lazy to troubleshoot, will check back when I'z bored

*edit: BUT WAIT
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Old 01-12-2016, 03:38 PM   #16
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you can't use the logs from the dyno brah
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Old 01-12-2016, 03:38 PM   #17
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logs are attached to the first post for your pleasure.
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Old 01-12-2016, 03:38 PM   #18
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************, thats probably why.

plz delete thread out of embarassment.
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Old 01-12-2016, 03:38 PM   #19
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cause the VD software calculates drag/resistance, which you don't have on a dyno
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Old 01-12-2016, 03:38 PM   #20
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it calculates frontal area against wind and some other sort of mumbo jumbo
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