Does the fan inside the turbo spin when the car is under 1000 rotations per minute? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-21-2006, 02:53 AM   #1
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Default Does the fan inside the turbo spin when the car is under 1000 rotations per minute?

Does the cold side of a turbo's turbine spin while the car is at idle/vacume? Thanx..... Pic for clicks....




(sorry for the title im bored)
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Old 10-21-2006, 02:58 AM   #2
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Depends on the engine/turbo combination. I would not be suprised if the Greddy one did spin at idle.
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Old 10-21-2006, 03:12 AM   #3
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I would guess all spin at idle... At least all turbos that we deal with will. Yes there is a turbo that will be so large and will have to much mass that it will not rotate. But i would be really surprised if anyone has installed a turbo that would not spin at 1000 rpm (unless its bearings were fuckkked)
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Old 10-21-2006, 04:45 AM   #4
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my turbo spin evening after shut down.
and at idle.
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Old 10-21-2006, 04:50 AM   #5
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turbo fan for a minute there i thought you where talking about an ebay bilge pump. :gay:
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Old 10-21-2006, 11:30 AM   #6
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I just went down to my newly rebuilt T25 sitting on my workbench and it spun when I blew through it. I think a Miata at idle puts out more exhaust gas than my breath, and probably smells better(HAH, beat y'all to it).

For info, the cold side of a turbo's turbine is called the compressor. There are three parts to a turbo's rotating assembly. The compressor wheel, the shaft, and the turbine wheel. Most turbos come with the turbine wheel attached, welded, sealed, whatever to the shaft. The compressor wheel is attached with a small nut.

Last edited by samnavy; 08-01-2007 at 10:41 PM.
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Old 10-21-2006, 12:33 PM   #7
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just pull your inlet tube and start up the car
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Old 10-21-2006, 12:54 PM   #8
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a t4 on a 1.6 does and so does a 60 trim s61 on a 1.8 i would say all spin at idle unless its some rediculously larger turbo that you have to spray on to spool
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Old 10-21-2006, 03:11 PM   #9
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a t70 on a 1.6 yeah it's laggy but it lets me make 600 whp
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Old 10-22-2006, 12:04 AM   #10
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I've been told that if the compressor is not moving there is something very wrong with the turbo.
-Michael-
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Old 10-22-2006, 12:19 AM   #11
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Yes, if a turbo shaft isnt turning at idle, it is gonna melt when you spin it up to 100k+ rpm to make your 15 psi of boost at redline. There should be virtually zero friction in the turbo under low load conditions.
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Old 10-22-2006, 12:24 AM   #12
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yeah with my turbo off you could blow into the turbine inlet and make it spin. 1psi of compressed air from my air compressor could make it spin.

start the car with the intake off and youll see it move.
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Old 10-22-2006, 05:04 AM   #13
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Quote:
Originally Posted by TheBandit View Post
I've been told that if the compressor is not moving there is something very wrong with the turbo.
-Michael-
There are turbos that CAT uses on 12cylinder 25L engines that will not spin from the flow available
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Old 10-22-2006, 09:49 AM   #14
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My GT2560R spins at idle... I would hate to think that it did not.

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