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Old 03-04-2010, 04:24 PM
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need some help

Ok here is the deal, I bought a 99 250 a few weeks ago. This is my first diesel truck so I dont really know anything except what I have been trying to learn on this site and others. the truck runs good and sounds great to me. I have the stock down pipe that steps up to 3.5 inch and then up to 4 inch ending over the rear axle. I did a DIY intake on it, and am running a superchips micro 1700 on the off road setting. I dont have any gauges yet but will as soon as I can afford to get some. The truck pulls like a freight train untill it gets to about 2800RPm then falls on its face and makes some strange noise to me. I dont know if this is normal and was wondering if there are any local guys or gals in the VA beach/ newport news area that is pretty knowledge d on these trucks that may could give me a hand and tell me what they think. I just dont want to mess anything up. This is the way the truck was setup when I got it except the intake mod and the 4 inch pipe I added to the truck. Any help would be much appreciated.
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Old 03-06-2010, 01:35 PM
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I'd check the fuel filter, but 2800 rpm is turning hard on the 7.3, the superdutys have wastegated turbos too, at that rpm and boost, could be just that, or defueling.
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Old 03-08-2010, 04:53 PM
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Ok so what your saying is this sounds normal? why does the truck have a 3500 rpm redline if it is only intended t pull to 2800rpm? Is the wastegate set to release at 2800 rpm? remember I am new to diesel trucks so I dont understand it all yet but I am reading and learning
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Old 03-08-2010, 05:04 PM
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What do u mean strange noise?
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Old 03-08-2010, 05:05 PM
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Elaborate on the strange noise. Is it like a loud krackle, or like its breaking down or?
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Old 03-08-2010, 05:29 PM
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And when it falls flat does the noise start or does it start when it still is climbing in the rpms
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Old 04-15-2010, 05:48 PM
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sorry been away from the cpu. The sound happens just after it falls flat and upshifts. I am thinking it is the turbo spooling down and I can really hear it cause of the open exhaust. I dont think the turbo is messed up but it could be a early sigh that it may be getting time for a rebuild maybee. The sound is kinda hard to describe kinda a loud whistle with a screeching kinda sound
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