Oil restrictors for GT series Garretts?
#1
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Oil restrictors for GT series Garretts?
I'm getting ready to install a GT40R turbo. I currently run a -3AN line for my plain bearing Mitsubishi.
I guess the question is, do I run say a 2AN line with no restriction or a common 4AN or 3AN line with a restrictor on these units? I've heard that the seals will blow out quite quickly without a restrictor and that they need just a splash of oil. What's a good source for restrictors? Any feedback greatly appreciated!
I guess the question is, do I run say a 2AN line with no restriction or a common 4AN or 3AN line with a restrictor on these units? I've heard that the seals will blow out quite quickly without a restrictor and that they need just a splash of oil. What's a good source for restrictors? Any feedback greatly appreciated!
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I checked the ATP site, go to GTBB install accessories, they have a oil restrictor fitting(.035") specifically for the "R" turbos.
Carl
http://www.atpturbo.com/root/releases/release112403.htm
Carl
http://www.atpturbo.com/root/releases/release112403.htm
Last edited by in2twins; 01-26-04 at 06:05 PM.
#4
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There is no need for a restriction on the GTBB series turbo's if you wanna pay money for something not needed that's fine, the center sections on GTBB series are restricted internally. I have had long discussions about this with numerious people at Garrett as well. Every single person both at Garrett US. and AU. say the same thing "if you wanna restrict it you can, BUT I WOULDN'T, it is restricted internally." also I have yet to have a single turbo out of the tons I've sold blow a seal of any kind.
-Sean
-Sean
Last edited by Zero R; 01-26-04 at 07:03 PM.
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Yup, Sean is right. Confirmed by doing a pressure test at the CHRA inlet to outlet. It restricts "air" about the same rate as a .030 fitting. My lips still tast like turbo flange.
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#9
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Originally posted by Zero R
There is no need for a restriction on the GTBB series turbo's if you wanna pay money for something not needed that's fine, the center sections on GTBB series are restricted internally. I have had long discussions about this with numerious people at Garrett as well. Every single person both at Garrett US. and AU. say the same thing "if you wanna restrict it you can, BUT I WOULDN'T, it is restricted internally." also I have yet to have a single turbo out of the tons I've sold blow a seal of any kind.
-Sean
There is no need for a restriction on the GTBB series turbo's if you wanna pay money for something not needed that's fine, the center sections on GTBB series are restricted internally. I have had long discussions about this with numerious people at Garrett as well. Every single person both at Garrett US. and AU. say the same thing "if you wanna restrict it you can, BUT I WOULDN'T, it is restricted internally." also I have yet to have a single turbo out of the tons I've sold blow a seal of any kind.
-Sean
Also wont the pressure at the turbo be dependent on the pressure coming out of the engine if it has had oil mods to boost its pressure? And then could require a pressure restrictor placed in line?
Most importantly what should this turbo be seeing in terms of Psi??
#11
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Originally posted by rotarypower101
Hey Sean, I was just poking around asking questions just to confirm what has been said about the GT series turbos is true, and I emailed ATP to see if the gt35R / gt 35/40 needs to be restricted or not. The response I finally got was that they are internally restricted, but not enough. This guy is full of SH*T right? What should this turbo actually be seeing in Psi?
Also wont the pressure at the turbo be dependent on the pressure coming out of the engine if it has had oil mods to boost its pressure? And then could require a pressure restrictor placed in line?
Most importantly what should this turbo be seeing in terms of Psi??
Hey Sean, I was just poking around asking questions just to confirm what has been said about the GT series turbos is true, and I emailed ATP to see if the gt35R / gt 35/40 needs to be restricted or not. The response I finally got was that they are internally restricted, but not enough. This guy is full of SH*T right? What should this turbo actually be seeing in Psi?
Also wont the pressure at the turbo be dependent on the pressure coming out of the engine if it has had oil mods to boost its pressure? And then could require a pressure restrictor placed in line?
Most importantly what should this turbo be seeing in terms of Psi??
Here is a piece taken right out of the book from garrett.
" oil pressure at turbocharger oil inlet to be 2.17kg/sq cm minimum at peak torque speed and above and no lower than .70kg/sq cm at idle.
So no lower than 30.8psi at peak torque speed no lower than 9.95 psi at idle. I hope that helps.
From my experience I have never needed one from what garrett has told me directly, If you want to you can, but there is no need, it is restricted internally.
-Sean
#12
I could see the "restriction" on the inlet side of the CHRA on my GT35/40 turbo.
Going from -4 to -3 won't really help restrict it as the inlet side is pressurized and a small decrease in size is relatively ineffective.
For my old T04B turbo on my FC, I tapped the oil inlet side and used a Holley carb jet (#60 from what I recall; i still have the package for reference).
Garrett GT series is nice and they considered many factors during in their design.
J
Going from -4 to -3 won't really help restrict it as the inlet side is pressurized and a small decrease in size is relatively ineffective.
For my old T04B turbo on my FC, I tapped the oil inlet side and used a Holley carb jet (#60 from what I recall; i still have the package for reference).
Garrett GT series is nice and they considered many factors during in their design.
J
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