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dips/ flat spots in every graph?

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Old Jan 8, 2005 | 12:37 PM
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Default dips/ flat spots in every graph?
Every N/A graph has a flat spot or dip around 3000-4000 RPMs and I never knew why. Ill post one of mine as an example.
Attached Thumbnails dips/ flat spots in every graph?-rev-xtreme-dyno-resized.jpg  
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Old Jan 8, 2005 | 02:20 PM
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Mine got dips and flat spots in it before we got it tuned out, but not at that low rpm. Mine was around 5200rpm, and we attributed it to knock retard. Here's one with a pretty bad dip in it....
Attached Thumbnails dips/ flat spots in every graph?-knockretard.jpg  
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Old Jan 8, 2005 | 03:46 PM
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That looks suspiciously similar to what I would expect from a few degrees of knock retard, like the 98 F-body cars. My (false) KR carried across almost the exact same RPMs. Until I tuned it out, of course.
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Old Jan 8, 2005 | 03:48 PM
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There was no KR. Every dyno Ive ever done does this. Ive also seen about every dyno graph have the same thing.
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Old Jan 8, 2005 | 03:54 PM
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Heres some from here:

https://ls1tech.com/forums/attachmen...chmentid=20913
https://ls1tech.com/forums/dynamometer-results-comparisons/258471-383-dyno-results.html
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Old Jan 8, 2005 | 05:15 PM
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Mine doesn't.

dynojet: not stock


mustang dyno, stock
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Old Jan 8, 2005 | 05:31 PM
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mine dont.......
Attached Thumbnails dips/ flat spots in every graph?-400rwhp.png   dips/ flat spots in every graph?-graph_hptq.png  
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Old Jan 10, 2005 | 04:45 PM
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Mine has a flat spot starting at 3800rpms on my new setup (but nitrous takes care of that ), and my old setup had a more pronounced dip. Every LS1 I've seen dyno does this too.

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Old Jan 10, 2005 | 06:13 PM
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Nitrous sure makes for some weird looking AF charts.
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Old Jan 10, 2005 | 07:06 PM
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mine does it too FMS 230 232 TEA S2 5.3s
Attached Thumbnails dips/ flat spots in every graph?-techdyno.jpg  
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Old Jan 19, 2005 | 12:41 PM
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I've seen it quite a bit too. I think Slowhawk has mentioned that often times it's a result of not enough timing in that area.
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Old Jan 21, 2005 | 08:28 PM
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heres mine not much of a dip lol
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Old Jan 22, 2005 | 12:02 AM
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Youll see it more and more pronounced the more overlap, tighter LSA running.

It can be help by timing some, its cam events and the long runner intake at work
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