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odd looking graph...questions

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Old May 10, 2009 | 10:10 PM
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Default odd looking graph...questions

first off I know the numbers are uncorrected these are the "real" numbers SAE numbers show 500+ which is definitely wrong.

my question is right around 4750rpm you can see the graph get very bumpy any idea why?





Chad

Last edited by Nimitz87; May 10, 2009 at 10:23 PM.
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Old May 10, 2009 | 10:19 PM
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Those numbers are only "real" for that weather and elevation. Corrected numbers would be more useful but it sounds like there's something wrong with the dyno correction software or weather station.
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Old May 10, 2009 | 10:25 PM
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Originally Posted by RyderTA
Those numbers are only "real" for that weather and elevation. Corrected numbers would be more useful but it sounds like there's something wrong with the dyno correction software or weather station.
correct. I know this...not worried about that at all. what about the bumps in the graph in the upper rpm's?

Chad
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Old May 10, 2009 | 10:28 PM
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My guess would be it has something to do with the valves, maybe springs. What does your head/cam combo consist of including valves? How old are the components?
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Old May 10, 2009 | 10:30 PM
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Originally Posted by Chris Gage
My guess would be it has something to do with the valves, maybe springs. What does your head/cam combo consist of including valves? How old are the components?
combo has maybe 5k on it.

manley valves, dart dual springs rated to .630 lift

Chad
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Old May 10, 2009 | 10:34 PM
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does the car tend to stumble when you drive it? I would wait to see what else is brought up as I am no expert but it would almost appear that the valves are floating. What are the specs on your cam?
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Old May 10, 2009 | 10:40 PM
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Originally Posted by Chris Gage
does the car tend to stumble when you drive it? I would wait to see what else is brought up as I am no expert but it would almost appear that the valves are floating. What are the specs on your cam?
nope no noticeable stumbling at WOT or slowing bringing the rpm's up, max timing is 24 deg IIRC

cam is a the torquer 2 232/234 .595/.598 112 installed straight up.


Chad
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Old May 10, 2009 | 10:43 PM
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Well if it isn't noticeable, maybe it is just somthing acting up with the dyno that day. It would hurt to check out the springs and make sure they have been set right just for insurance. Whose dyno was this and who did the tuning? I am not really sure where Cooper City...
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Old May 10, 2009 | 10:47 PM
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Originally Posted by Chris Gage
Well if it isn't noticeable, maybe it is just somthing acting up with the dyno that day. It would hurt to check out the springs and make sure they have been set right just for insurance. Whose dyno was this and who did the tuning? I am not really sure where Cooper City...
dyno was ZFever in Tampa, tuner was Jeremy Formato I'm going to call him tom and see if he has any ideas about the graph bumps.

Chad
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Old May 10, 2009 | 10:51 PM
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Yeah it would be best to ask him as he knows that dyno and has seen about a million graphs and I am sure he has come across this before. He is usually pretty good at figuring out the issues, he was able to tell me that there was a oil consumption issue through my intake after just throwin my car on the dyno for fun and logging it a few years back. Also, maybe try out a different dyno if it is convienent for you, Ford Speed has a dyno not to far away.
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