Urgent! Turbo oil supply banjo bolt advice please:)
 

I'm just fitting a vf35 to my v3 sti. Obviously the standard vf23 that was on there is a roller bearing type thus requiring less oil. I have the banjo bolts from each turbo shown below. On the left is the vf23 one with a 1mm hole and smaller bore(not that that probably matters) and on the right is the vf35 one with a 1.5mm hole.

My question is about the bolt in the second photo. The one with the filter in that goes into the head. It currently has a 1mm ish hole in it. I'm assuming it'll be ok to remove the filter and drill the hole out to a larger diameter. Does anyone know what size I need to drill it to? i.e what size hole is in the one that usually goes with a vf35?
Need to get it together as I'll probably be too busy after today for a while!

Thanks.

Attachment 52663

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Any ideas anyone? :)

Take out the filter and bin it. There is a thread on here about a member wrecking two turbo's in 2 weeks, I have put a link on there worth a good read.

On second page, latest post at 08:40 by lateral performance.

Cheers. I was going to get rid of the filter, but wondered what size I should take the head banjo bolt hole to. I've found this 22B Bulletin Board: The definitive Turbo oil banjo bolt/restrictor thread which says that on a td05 you have the 1mm at the turbo and 2 4-5mm holes at the head end, but as the turbo end on the vf35 has a 1.5mm hole I was wondering what it uses as standard on the head end of the jdm sti it comes off so I know what size to drill mine to and whether to have 1 hole or 2. Anyone know?

I suppose that if the banjo hole is to big then there will be a reduction in oil flow and pressure further down the chain.

Ok, so I've found another banojo bolt in my workshop, probably from the water side of a turbo. it's on the right of the pic below compared with the one i may drill out. I notice in the 22b thread above a couple of people say they're not convinced the restrictor in the head's required, in which case my new one with 2 holes of approx 6mm will be fine.

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Now my question is in that case will it really starve the valve train etc of oil, or will my 1.5mm restrictor on the turbo do enough restricting on its own regardless of how big the one on the block is?

In that case I'm assuming as long as I use one in the block larger than the one one the turbo it'll be ok????

If however people think using the 6mm one will allow too much flow to the turbo, perhaps i'm better off drilling my small one out to a size somewhere between the two?

Cheers:)

The cylinder heads have their own restrictors fitted into the main oil supply gallery on each head, so there shouldnt be a problem with oil starvation to the heads.
If the turbo end of the VF35 originally came with a 1.50 mm restrictor, then 2 x 4~5mm holes on the head end banjo bolt sounds about right.

Mick

Thanks alot mick. noticed the holes in the actual pipe are pretty small anyway, so I'm sure it'll be fine.