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Dyno graph?

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Old Jan 5, 2004 | 01:36 PM
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Default Dyno graph?

I just had heads and a cam (see sign) put on and tuned by LS1 edit myself. I went to a local dyno shop to have it dyno'd and the line is not straight but jagged all the way through. Could someone tell me what was causing this? You can not hear any missing or breaking up while running. Thanks.
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Old Jan 5, 2004 | 02:11 PM
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Do you have a copy of the graph?
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Old Jan 5, 2004 | 02:14 PM
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No that is another problem. I am trying to find someone with a scanner to scan it for me.
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Old Jan 5, 2004 | 02:32 PM
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Take a picture of it with a digital camers. That is what I did...
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Old Jan 5, 2004 | 03:01 PM
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I think dynos have some "smoothing" function they can
apply to take out driveline jerk and any drum wobble,
etc. Maybe they forgot to turn that feature on.
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Old Jan 5, 2004 | 05:23 PM
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How are u supposed to post a graph from an email? Thanks
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Old Jan 5, 2004 | 06:21 PM
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Originally Posted by 00SS4780
How are u supposed to post a graph from an email? Thanks
Steve, I posted your dyno graph on my picture web site. Click on "Steve dyno" at the bottom of the page to view.


http://www.netsnapshot.com/pcw/buildalbum-cgi?ACCOUNT=4715&KEY="0"
Attached Thumbnails Dyno graph?-steves-s-dyno.jpg  

Last edited by Lady Redhawk; Jan 5, 2004 at 06:41 PM.
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Old Jan 5, 2004 | 06:38 PM
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Here ya go

Last edited by frcefed98; Jan 5, 2004 at 06:44 PM.
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Old Jan 5, 2004 | 06:52 PM
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Thanks for the help!
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Old Jan 5, 2004 | 07:16 PM
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Up to 5K the graph is smooth, so this is not an effect of the smoothing function in the Dynojet software.
It looks like detonation to me, it could be false knock or real you can't tell from the graph.

Last edited by AZLS1; Jan 5, 2004 at 10:36 PM.
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Old Jan 5, 2004 | 07:21 PM
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During the run you could not hear anything. There was no cutting out or anything.
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Old Jan 5, 2004 | 09:21 PM
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Any reason why the graph doesn't display the air/fuel ratios? A/F's are one of the most important parts of the dyno-tune.

And why can't the shop/person who took the money from you for use of the dyno tell you? This a question not expecting an answer.

I question shops who do dynotunes and charge for it but can't interpret/explain the results to their customers.

Last edited by dlandsvZ28; Jan 5, 2004 at 10:11 PM.
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