Garrett GT28 Banjo Bolt Oil Restrictor Size

[Lukezen27]

Hey Guys

The banjo bolt that came with my GT28/25 braided oil feed line has a 1.5mm restrictor size hole while the banjo bolts oil restrictor from GCG has huge 4mm hole and GCG assures me this size is correct.


Most posts I’ve come across recommend 1.5mm size for Garrett turbo’s

What size are you guys running with your GT28s?

Thanks

Luke

[IEVAQ8]

i was running the fittings i got with my oil lines 4mm restrictor and turbo started to leak through the oil seal but not out the exhaust but between the 2 housings..........had it rebuilt under warranty and explained to me, that due to the high oil pressure in honda engines, it makes it too high for the turbo charges, i was advised to run a 40thou (i been told that is 1mm) restrictor, but im gonna try using a 1.5-1.6mm restrictor to start with.

good luck....

[Lukezen27]

i was running the fittings i got with my oil lines 4mm restrictor and turbo started to leak through the oil seal but not out the exhaust but between the 2 housings..........had it rebuilt under warranty and explained to me, that due to the high oil pressure in honda engines, it makes it too high for the turbo charges, i was advised to run a 40thou (i been told that is 1mm) restrictor, but im gonna try using a 1.5-1.6mm restrictor to start with.

good luck....

I turned my car on for first time with the 4mm and oil made it into the compressor housing on idle n didn't drive anywhere..

I don't think that happened with the 1.6mm

So my turbos fuked now?

[IEVAQ8]

ur turbo cant be fuked from too much oil, mine had too much oil pressure for over 4 months before the seal satarted to leak, but when they stripped the turbo, the seal wasnt even broken or cracked, just the oil had been pushed past it.......

i reckomend u use the 1.6mm restrictor

[Lukezen27]

ur turbo cant be fuked from too much oil, mine had too much oil pressure for over 4 months before the seal satarted to leak, but when they stripped the turbo, the seal wasnt even broken or cracked, just the oil had been pushed past it.......

i reckomend u use the 1.6mm restrictor

Yeah cool

Even on the Garrett website they state oil pressure as one of the course of oil leak into the compressor housing but not say the turbo needs rebuilding.

Just a list of what to check and change..

[Lukezen27]

I'm thinking the return lines to small

Looks big on the out side but only about 7-8mm across

[IEVAQ8]

u got a pic of the 1.6mm restrictor??? and what brand or where it came from???

cheers

[Lukezen27]

u got a pic of the 1.6mm restrictor??? and what brand or where it came from???

cheers

Still to much oil IMO

I'm going to look for a 1mm

I tested this by running the oil return line to an oil pan...

Holy crap the 1.6mm pushes lots of oil through and thats just on idle


What size oil return line are you running?

Any change I've put the flange to low?

[ZeForce]

As long as it is above the level of the oil it should be fine


Also, Im using a 1.5mm restrictor on my journal bearing turbo and AFAIK ball bearing turbos require less oil so you would probably need 1mm restrictor

[Lukezen27]

As long as it is above the level of the oil it should be fine


Also, Im using a 1.5mm restrictor on my journal bearing turbo and AFAIK ball bearing turbos require less oil so you would probably need 1mm restrictor

its at the same level as the oil and when the cars off and I removed the oil line connector oil drips out slowly but once the car start the oil level would change right? While oil moves round the motor.

Yeah man 1.6 is way to big that’s for sure after my little test.

Dam banjo bolt is still leaking after all that fuking round as well...

Plus I'm quite sure the turbo seals are gone event though it brand new!!

If I push air throw the compressor inlet and cover the compressor outlet I can hear air going into the oil part of the turbo.

[datzlr]

whats the oil restricter ?

[Lukezen27]

whats the oil restricter ?

It restricts the amount of oil going to the turbo ball bearing