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Turbo Oil Flow Test

DaveB

By DaveB,
in Engines & Forced Induction

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DaveB Mentor

DaveB

Posted
Posted

Hi there,

After getting my NEO turbo hi-flowed (GCG), the turbo specialist at the shop I went to told me I needed to do an oil flow test, with the oil feed line to the turbo, with the turbo off.

Has anyone done one of these before? Surely the flow of a standard RB25 oil feed must be known? Only been done about a million times before...

Still I thought it best to test my specific situation...

Only problem is, I can't get higher than 250mL in 15 seconds, which works out to ~1 litre per minute. I was advised I needed minimum 1.5Lt/min (so 375mL in 15 sec) and no more than 2Lt/min. This is with an unrestricted banjo bolt in the engine end of the feed tube, no banjo bolt in the "catch end" (in the bottle which represents the turbo), and one of the banjo's has a restriction.

The line is new by the way; I had Pirtek make up a stainless one using the original banjos from the original oil feed line.

Does anybody know if 250mL is right, and what sort of flow I need? What can I do - spend another $100 to get another line made up, and then try that in the hope that I've gotten the restriction right?

thanks

DaveB

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crayman Explorer

crayman

Posted
Posted

You need to drill out the banjo bolts to get the desired oil flow - I had this issue with my RB30E+T, I think I ended up with 400ml in 15 seconds which was bordering on high-ish, but never had smoking from the exhaust due to excessive oil intake.

This has had the ball bearing CHRA replaced with a bush bearing core as I understand happens with GCG highflows, yes?

STATUS Grand Master

STATUS

Posted
Posted (edited)

easy fix if your worried about your oil issue and the GCG turbo, ring the boys (GCG) on 02 9708 2122 they have never let me down and offer spot on info to customers, they also do ALL our turbo work (hi-flows, rebuilds). They are only Hiflow guys i can use reliably without fear of boomerangs.

Edited by URAS
DaveB Mentor

DaveB

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  • Author
Posted (edited)

Thanks a heap for the replies guys, that puts my mind at ease a bit more... for the record the GCG hi-flow of the stock turbos is a complete new Garett core, and is ball bearing.

I was told I needed between 1.5L and 2L per minute, I got ~400mL in 15 seconds. Glad to see yours was similar crayman; I'm sure this info must be known for the stock RB25DET engines - I mean it's only been done about a million times before. Still, I guess I know that my setup specifically is safe.

For the record I have found, that the stock line is fine for flow if you just drill out the banjo *bolts*; they have about a 1mm restriction in *both* of them. If you drill them out on an RB25 (NEO in my case) you should get around 400mL/15sec at idle.

PS Thanks URAS, that number may yet come in handy :)

Edited by DaveB

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