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Old 01-14-2014, 12:44 PM
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Question Question about surging ?

Hello guys , I have a 2006 that we just put a rebuilt 04' turbo with a WW2
billet wheel and a 4" exhaust ( no cat ) on recently and it has developed
a "surge " ( for the lack of a better term ) between 2000 and 2500 rpm's .
It showed up after a couple of days .
It is more pronounced during driving as it approaches full temp (190 on the stat )
and is still slightly there once up to full heat soak .
Also it's more pronounced at med. throttle but if you lay into it , it's not as bad .
Just installed new fuel filters to be sure . Starts good cold and hot , seems to make
good power etc.
Any ideas ?
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Old 01-14-2014, 12:46 PM
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It's not bucking , just more of an RPM waver .
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Old 01-14-2014, 01:35 PM
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Can you get a video of it?
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Old 01-14-2014, 03:43 PM
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Sounds more like you are overspeeding the turbo. Sort of like this (video below)??

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Old 01-14-2014, 04:11 PM
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Probably need to drop the VGT duty cycle a little.
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Old 01-14-2014, 05:13 PM
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I tracked a pesky problem like that last year and it was the lower connection of up pipe bolts vibrated loose. Caused similiar issues
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Old 01-15-2014, 06:02 AM
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Thanks guys , I've got the young lad working on some video's to load .We'll see if we
can get some AE screen shots up as I drive it .We have a GOPRO but I don't know what
the sound quality will be like .
Also , the turbo and exhaust weren't installed together , the exhaust was put on about
a week after the turbo.( Then the issue showed up ).
If all the "plumbing" is tight with no leaks , would a tune be needed (SCT) to rectify
the problem ? It is a stock truck otherwise .
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Old 01-15-2014, 06:07 AM
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D#@m it , sorry I forgot to mention , the egr delete has been performed but the valve
is still intact . I don't believe it's turned off as I see readings on AE . I will see if I can
"get it together " and be more precise with my statements and descriptions .
Thank you
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