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Old 03-17-2008, 10:46 AM   #1
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Default How accurate is Data Log Lab??

I finally got around to getting some data logs of my car and was playing with them im DLL. I got it to show a power graph (with needed input..weight,gear,transmission) and it's showing some hp/tq numbers. How accurate is this?

Side note, anyone have much exp. with this program? Im having some trouble understanding some aspects of it :(
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Old 03-17-2008, 10:51 AM   #2
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Curious what the results were?
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Old 03-17-2008, 11:02 AM   #3
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not saying until i get some feedback
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Old 03-17-2008, 11:09 AM   #4
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then it's totally, horribly, and catastrophically optimistic
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Old 03-17-2008, 11:16 AM   #5
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lol... i knew you would say that!
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Old 03-17-2008, 11:29 AM   #6
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There are elements it just can't account for - like grades and wind. I made adjustments to the settings for the "power" results to match my dyno sheet - but they were way off on my peak horsepower and way under on my curves pre-peak. Nearly everybody says the same thing - use it for before and after tuning, but not for making dyno power claims.
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Old 03-17-2008, 11:32 AM   #7
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the power curves in DLL dont resemble dyno curves. Here's a fun example:



here's a real dyno plot of my car (not at the same time)



I have the datalogs from the second graph at home. maybe I'll run those through DLL and see how the curve looks for you.
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Old 03-17-2008, 11:49 AM   #8
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so it looks like it is not too far off crank hp...

Well here was mine *puts flame suit on*

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Old 03-17-2008, 11:53 AM   #9
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LOL, that's inline with what I was expecting. Your car makes closer to 250
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Old 03-17-2008, 11:59 AM   #10
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^^ which would imply that it isn't far off the crank hp (+- a few hp). So i figure maybe 15% loss in drivetrain and get 260rwhp and 237rwtq

And this is at 10psi. (ok, 10.5). While i wait to gather funds to take it to get dyno tuned, i sent Jeremy the data log and map for fun to see what improvements he can make. I want to hook up the EBC and run 12-13psi..which should get me closer to 270-ish.
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Old 03-17-2008, 01:01 PM   #11
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Ben, is this is how FM gets the 291 figure
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Old 03-17-2008, 01:32 PM   #12
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Mike - 260rwhp at 10psi would be nothing short of phenomenal, given what y8s got (240rwhp @12psi) with his custom setup and a standalone. Unless there's more to your car tan stated in your sig.
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Old 03-17-2008, 01:46 PM   #13
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Quote:
Originally Posted by m2cupcar View Post
Mike - 260rwhp at 10psi would be nothing short of phenomenal, given what y8s got (240rwhp @12psi) with his custom setup and a standalone. Unless there's more to your car tan stated in your sig.
oh sorry, you want this graph.

sure it's not quite 260 rwhp, but it also aint quite 10 psi.
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Old 03-17-2008, 02:39 PM   #14
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Damn. Ok - maybe I was remembering an earlier dyno... impressive nonetheless.
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Old 03-17-2008, 03:07 PM   #15
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Well then if y8s' car is about the same as mine (10:1 comp/2560r/Hydra/2.5" exhaust/fairly large intercooler/550's) then my guestimate isn't far off ?
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Old 03-17-2008, 03:20 PM   #16
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matt's running a 2876r
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Old 03-17-2008, 03:28 PM   #17
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and 3" exhaust.

but I mean you can use DLL for power graphs. just dont compare them to a real dyno. the best way to use DLL power graphs is to find a stretch of road that is the following:

1. long
2. flat
3. cop free
4. point A easily entered from a dead stop or <10 mph in 2nd.
5. point B easily exited shortly after redline in 2nd.
6. has a quick route from point B to A with a parking lot and good lighting

and then you can do a run, make changes, do a run and see if you improve power or not.
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Old 03-17-2008, 04:34 PM   #18
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Quote:
Originally Posted by y8s View Post
and 3" exhaust....
and cat?
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Old 03-17-2008, 05:08 PM   #19
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yep
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Old 03-17-2008, 06:10 PM   #20
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hmmmmmm


I do want to go with a 3" system...but that would require a BEGI or custom DP and custom exhaust.....both cost more money then have to spend at the moment :(
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