Turbo seems louder, now I have less power - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 07-12-2011, 07:43 PM Thread Starter
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Turbo seems louder, now I have less power

2000 F350 7.3. It's not that much louder, but i noticed it.
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post #2 of 13 Old 07-12-2011, 08:36 PM
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Do you have gauges? Checked your intercooler boots? Fuel mileage worse? Have you visually checked the turbo wheel?
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post #3 of 13 Old 07-12-2011, 08:46 PM Thread Starter
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I do have gauges, seems like I was putting out out about 17 psi max and now its around 14-15. Is there a easy way to check the wheel? The boots look good, a little oily though.

There is 210k on it with a superchip reprogram at 50 HP, 4" exhaust turbo back, and a K&N filter.
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post #4 of 13 Old 07-12-2011, 08:53 PM
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Take your intake off and you can see the compressor wheel right there.

The K&N probably isn't doing it any good letting **** get sucked into it.
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post #5 of 13 Old 07-12-2011, 09:33 PM
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Dump the K&N and check your uppipes too...should be making more with that superchip tune than that.
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post #6 of 13 Old 07-12-2011, 09:53 PM Thread Starter
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What should I use instead of the K&N?
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post #7 of 13 Old 07-13-2011, 07:12 AM
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The DIY 6637 Intake is a cheap, and very effective PROVEN alternative, but any dry element filter would be better than the K&N.... they just aren't for diesels. (DIY Write-up is in the 7.3 Tech Files)
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post #8 of 13 Old 07-13-2011, 08:17 AM
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I'm gonna guess a leak somewhere after the turbo on the intake side. I guess it would have to be intercooler boots. I'm not sure if a broken or worn fin would make it louder and assuming the noise/power change was instant, that sounds more like a boot slipping off than fins wearing down

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post #9 of 13 Old 07-27-2011, 08:06 PM Thread Starter
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OK, I finely got back in town long enough to look at the turbo. Some blades appear to have abrasions on the leading edge. When I try to move the spool up and down, there is slight movement.

At 2100 rpm I show about 4-5 psi of boost. Is the turbo bad?

The Streaks are from my finger prints in the oil
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post #10 of 13 Old 07-28-2011, 10:36 AM
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Your turbo looks fine.

There are 6 rubber boots in all supplying the system after the turbo. Chances are you have a leak in one of them. You may want to order a replacement set to be sure, or create a boost leak detector.

I pulled all 6 of mine off and cleaned them up. I reinstalled and pull 22+ at WoT with the superchips pack. Mid throttle acceleration is around 14psi. it should peg the 22+ VERY quick if you slam on the gas peddle. Remember boost is not a function of RPM, but of load and throttle position.

Other possibility are your up pipes.
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