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Wavy Dyno Graph?

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Old Feb 6, 2012 | 04:34 PM
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Default Wavy Dyno Graph?
Got a re-tune the other day since i put in a stall and 243's, Tuner told me I had a slight misfire under load that was probably ignition related and the Graph had a wavy hp curve

Plugs are NGK's and were changed with the wires about 20K ago

My coil pack wire has a small nick in it, so I'll start by fixing that and changing the fuel filter


Anybody had a graph look like this before?


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Old Feb 6, 2012 | 07:40 PM
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What's your compression and what Ngk plugs are you using?
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Old Feb 6, 2012 | 07:59 PM
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Looks like a problem with the pickup wire for the dyno. Not a car problem.
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Old Feb 6, 2012 | 09:11 PM
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Running the tr55s, not sure what the compression is.
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Old Feb 8, 2012 | 07:19 AM
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Smoothing of 1 probably has something to do with it
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Old Feb 8, 2012 | 07:37 AM
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Its hard to see in the pic, but smoothing is at 5, a/f was at 12:1
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Old Feb 8, 2012 | 08:09 AM
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Is it? On my phone it looks like a 1. Hard to see as the mobile sight squashes pictures.
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Old Feb 9, 2012 | 05:09 PM
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Yes, and the funny thing is, i cant tell any misfires when im driving. It shakes a little at idle, I believe thats just the cam and the poly mounts.
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Old Feb 10, 2012 | 01:39 PM
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Sampling rate should of cleared that up too.
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Old Feb 11, 2012 | 09:43 AM
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Originally Posted by Slowhawk
Looks like a problem with the pickup wire for the dyno. Not a car problem.
^This.

Mine did the same thing, and my Tuner said it was the pickup as well. https://ls1tech.com/forums/dynamomet...ideo-pics.html
Last edited by KC Henry; Feb 11, 2012 at 09:49 AM.
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