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back to back dyno runs, inconsistent #s

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Old Apr 16, 2006 | 11:14 AM
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Default back to back dyno runs, inconsistent #s

I just got my car dyno tuned, I put in a 224/230 cam in it, and 3200 fuddle stall,
car previously put down 329hp/340rwtq,

on the 3rd tuning run the car put down
370.7rwhp and 366 rwtq,
but 10 minutes later on the 4th and final run the car put down
356.2rwhp and 384.3 rwtq
WTF?!
AF ratio is right at 13 and the powers climbs on both runs to at least 6700rpms, i'm worried about the inconsistency in the #s,
so I'm gonna go to the track to see what the mph improvement is.

pat
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Old Apr 16, 2006 | 11:19 AM
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a4 or m6? Was it a mustang or dynojet? Were you spinning on the dyno at all?
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Old Apr 16, 2006 | 11:23 AM
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A4, 3200 Stall,
don't know what kind of dyno it is, it was done at Champion Motorsports here in south Florida,
I can't tell if it spun on the dyno, there are small breaks in the HP and tQ lines on the graph
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Old Apr 16, 2006 | 11:27 AM
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the dyno is probably messed up
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Old Apr 16, 2006 | 11:58 AM
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Stalled autos won't dyno like an M6. Take it to the track and see your improvements........that's all that really matters anyway.
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Old Apr 16, 2006 | 12:03 PM
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The tranny could have been getting hot at that point. I wouldnt worry about it.
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Old Apr 16, 2006 | 12:08 PM
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Was the converter locked or unlocked?
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Old Apr 16, 2006 | 12:25 PM
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Originally Posted by z28pat
A4, 3200 Stall,
don't know what kind of dyno it is, it was done at Champion Motorsports here in south Florida,
I can't tell if it spun on the dyno, there are small breaks in the HP and tQ lines on the graph
Here, I'll show you my goofy looking graph. Maybe it will make you feel better. I run 12.2s with less than 300 rwhp and 11.3s on a little 100 shot. That's why I said don't worry about your dyno numbers.
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I do believe that's the first time I've seen loop-the-loops on a dyno graph.
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Old Apr 18, 2006 | 10:29 PM
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Holy crap! That red line forms a freaking "e"!
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Old Apr 19, 2006 | 08:55 PM
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Ok,
latest update here, just went to the track on my Wide Oval Firestone tires,
285 40 17s and ran back to back 12.5s at 111+ on 1.98 60's,
Next time, I'll hit it with the 75 shot and see how that goes.
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