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Size Matters- Turbo Oil Restrictor Sizing

Old 12-13-2004, 07:31 PM
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i often hear stories about rx7 owners that want to shoot their turbo builders... i know one party that sent his new turbos back 3 times because they "SMOKED"



actually, a couple of weeks ago i was ready to call UPS after a summer of smoking up the wisconsin landscape.



i run 2 t04/t3 hybrids. i had started w .09 restrictors and had subsequently downsized to .07 w no improvement.



then i remembered Steve Kan telling me that t3s need .03 or they will smoke. i thought i would give it a try before shooting my good guy turbo builder Kevin Draper. i located a dremel drillset that had a .034 bit and.....



no smoke it has been 400 miles since and my turbos are spooling and smiling.



if you find yourself w a smokin' turbo SIZE does matter so make sure you have the correct restrictor.



BTW, since the area of a circle is radius squared times Pi... my restrictor area is now 27% of what it was at .07.



thanks Steve,



howard coleman
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Old 12-13-2004, 07:51 PM
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I want to know more about the concept of restrictor purpose after I get the 2nd new turbo. But why doesn't the turbo have that proper restrition built in its center section from Garrett (whoever) since they design them and know what is too much?
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Old 12-13-2004, 08:09 PM
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many turbos were designed to work with over the road diesel truck engines and require modification for use in the typical car. if, for example you had no restrictor in a Garrett t3 or t04 you would pump so much oil thru the turbo that your engine would lose almost all it's oil pressure.



newer GT turbos, as i understand, generally have built-in restrictors as they have been designed to work w cars...



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Old 12-13-2004, 08:34 PM
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Good info. Yeah if you don't restrict the oil pressure it likes to slip past the seals, causing that nasty smoke.
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Old 12-13-2004, 08:51 PM
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your turbo doesn't need all the pressure than the engine needs to get the oil where it needs to go. So when you restrict, you decrease the flow, less flow = less pressure. I'm sure there is a perfect pressure that the turbo likes to see, but I'm not sure what that is, and I don't know the math to knock the engines oil pressure down to that amount so I'm gonna call some people who do, and ask them. But that's the general concept.
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Old 12-13-2004, 10:37 PM
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Where can you even get restrictors?



I guess turbos don't normally ship with them...
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Old 12-13-2004, 10:56 PM
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Originally Posted by mazdadrifter' date='Dec 13 2004, 09:51 PM
your turbo doesn't need all the pressure than the engine needs to get the oil where it needs to go. So when you restrict, you decrease the flow, less flow = less pressure. I'm sure there is a perfect pressure that the turbo likes to see, but I'm not sure what that is, and I don't know the math to knock the engines oil pressure down to that amount so I'm gonna call some people who do, and ask them. But that's the general concept.

That little bit would be a world of knowledge for lot of smoking turbos.

Also put that with the oil catch tank concept it should clean things up a lot.
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Old 12-13-2004, 11:14 PM
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Originally Posted by Dysfnctnl85' date='Dec 13 2004, 11:37 PM
Where can you even get restrictors?



I guess turbos don't normally ship with them...



if it's a kit for a particular setup, it will probably ship with it, but for a turbo by it'self there are just too many variables. I think I've heard of people using modified nitrous pills.
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Old 12-14-2004, 06:43 AM
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Yeah mine definitely didn't come with one, so I was just assuming I only needed what came with it.
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Old 12-14-2004, 11:37 AM
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Originally Posted by howracer' date='Dec 13 2004, 06:09 PM
many turbos were designed to work with over the road diesel truck engines and require modification for use in the typical car. if, for example you had no restrictor in a Garrett t3 or t04 you would pump so much oil thru the turbo that your engine would lose almost all it's oil pressure.



newer GT turbos, as i understand, generally have built-in restrictors as they have been designed to work w cars...



howard coleman



you have to wonder how many turbos would have not had to be rebuilt if they had a card explaining the restrictor thing in the box with the turbo?
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