Torque Converter Hiss - Ford Powerstroke Diesel Forum
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Old 06-25-2013, 05:24 PM
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Torque Converter Hiss

I've been wondering what this is for a long time and today after driving around with the windows down got a bit annoyed. I just figured I'd ask in case it turns out to be something that eventually hurts the TC.

Basically I run H&S S2L which is 5th lockup only @ 45mph. When the TC locks, there is a loud swoosh or hissing noise similar to a boost depressurizing noise, though much slower. Hard to describe but if I'm just cruising around with minimal throttle (no boost) and the TC locks, as the RPMS dip there is a sppshhh noise. I can manipulate the sounds with throttle (like it's building pressure), say if I give it some throttle while it's pshhing I can carry it.

It could be coming from the turbos but it's really loud and sounds like it's coming from under the truck. It also doesn't stay in sync with boost pressure (gauge) so not sure. Doesn't sound like any of the typical turbo noise I hear outside of TC lock.
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Old 06-25-2013, 06:22 PM
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Its turbo surge. Not going into details but your rpms is dropping a good bit while your intake valves, etc arent accepting air as fas as they was and the air has to go somewhere so it trys to force back out the turbo
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Old 06-25-2013, 06:29 PM
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nm guess I'll just ignore or switch to S2H

Last edited by reighnman; 06-25-2013 at 07:09 PM.
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Old 06-25-2013, 07:28 PM
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if it is turbo surge then switching shift schedule or tunes wont matter just dont floor it and let off really quick.....unless thts not your problem then i have no idea
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Old 06-25-2013, 07:51 PM
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There is minimal if any boost when the TC locks, I'm talking going into TC Lock @ 1500-2000 rpm with minimal throttle pos.
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Old 06-26-2013, 02:54 AM
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I asked the same question a few months ago but didn't get much help. It's not the turbo from what I can tell, I also believe it's the torque conv.
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