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  #41  
Old May 28th, 2012, 10:38 AM
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John B.
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Sounds like turbo noise. Turbos do whistle some when under boost. If it is more than normal I would suspect a boost leak. Do you have a shop vac with a blower side attachment? If so, run the hose to the turbo intake and look for leaks.
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  #42  
Old May 28th, 2012, 11:31 AM
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Great idea. I'll do that!
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  #43  
Old May 28th, 2012, 11:33 PM
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Quote:
Originally Posted by bossman429 View Post
So we've driven the truck about 100 miles. Some local and a good stint or two on the highway at 60-65. It runs great. But there is a very annoying whistle as the revs increase under load. It seems like the whistle is getting louder the more it's driven. I assume this is related to boost Any idea what's causing this and how to fix? I checked and all inter cooler pipes and connections seem air tight. I can make it whistle a little by revving without load but it's much more faint and only at higher Rpms. Under load it whistles from what feels like 2krpms and up
Turbo whistle. If you are not running the stock airbox, it is very loud. If you are just running a flex pipe into the turbo without an airbox, and leaving the flex pipe hanging down it is extremely loud. If you run with the flex pipe on top of the fan shroud, it's much quieter, but still noisy.

I ran it sans airbox for rausch creek for fear of pulling air through the side wing intake. On the way home, even Jason (Nathanwind) mentioned he could hear the whistle when driving next to me.

The quietest way to run is with the airbox on.
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  #44  
Old May 29th, 2012, 06:39 AM
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Here's how I have the air box set up. It's getting louder as I drive more so I think it's a leak. Gonna check it out tonight
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  #45  
Old May 29th, 2012, 08:37 AM
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Matthew
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The whistle in my truck with the stock setup is very loud under boost. I like it
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  #46  
Old May 29th, 2012, 09:29 AM
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Waaaay off-topic, I know, but the turbo whistle made me think of this all-time classic:
http://www.funnyordie.com/videos/014...with-bubb-rubb

especially his explanation at 1:36, CLASSIC!

Sorry Adrian, but this is too funny not to share within this thread.
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  #47  
Old May 29th, 2012, 11:05 AM
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I haven't even opened that (at work and on my phone app). But I know that's the whistler tip video. Whoooo wooooo!

I thought the same thing for sure
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  #48  
Old May 29th, 2012, 11:32 AM
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FWIW, I like to hear the boost spool up (within reason) because it helps me regulate throttle control to keep the RPMs as low as possible while still maintaining some level of boost. Without the benefit of a tach, you need all the audible inputs to feel the right RPM (at least that's how I think). Of course you don't need to hear the thing screaming and if there's a leak obviously it needs to be chased down.

My 200Tdi was significantly louder than my 300Tdi. In part because the turbo in a true (Defender) 200 is right up beneath the bonnet and not covered by under the heavy rubber insulation mat like the 300 is.

My 300Tdi is much quieter with the intake muffled by the snorkel as well.
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  #49  
Old May 29th, 2012, 01:24 PM
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Quote:
Originally Posted by sonoronos View Post
Turbo whistle. If you are not running the stock airbox, it is very loud. If you are just running a flex pipe into the turbo without an airbox, and leaving the flex pipe hanging down it is extremely loud. If you run with the flex pipe on top of the fan shroud, it's much quieter, but still noisy.

I ran it sans airbox for rausch creek for fear of pulling air through the side wing intake. On the way home, even Jason (Nathanwind) mentioned he could hear the whistle when driving next to me.

The quietest way to run is with the airbox on.

Running with no air filter
"pulling air through the side wing intake" assume you mean water not air.
You're more likely to ingest water by dipping the nose in than get it in through the side wing.
I once managed to fill the filter when "parked" very nose down in water, came in through the dump valve.
The K&N filter atomised the water enough so the conrods didn't get bent due to hydraulic locking.
I'd never run off-road without a filter.
Look after my old truck Ed.
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  #50  
Old May 29th, 2012, 01:45 PM
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Quote:
Originally Posted by mikeslandrover View Post

Running with no air filter
Look after my old truck Ed.
Yes, I meant water It's back on now, no worries!

Don't ask what happened to the roof or the fuel tank though!!
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  #51  
Old May 29th, 2012, 02:26 PM
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Quote:
Originally Posted by sonoronos View Post
Don't ask what happened to the roof or the fuel tank though!!
Now you've got to post pics!
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  #52  
Old May 29th, 2012, 07:16 PM
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Well I found a hose that was loose. The band clamp was just starting to stretch/strip. I replaced them all with heavy duty stainless steel ones (60) bucks worth! And much better! Now it's just a faint turbo sound under boost. 100x better than it was. Thanks all!
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