blowing smoke

[brisvr4]

I've just sent PTE an email asking for clarification on the oil pressure issue and drain line size that they recommend.
Hopefully that should help.
BTW, mine is fed from the filter housing.

 

[brisvr4]

Just got a reply back from Jeremy at PTE.

Tim,

Max oil pressure is a somewhat debatable topic. I have seen turbo's hold over 100 psi no problem. Would I recommend that? No. I would like to see no more than 65-70 psi.

-10 is what is recommended for a drain. Just make sure that you are not using any 90* elbows as they hinder the gravity draining quite a bit. Another thing to make sure of is that your turbo is clocked correctly so that the drain is facing straight down, 5*.

A -4 oil feed is what like to see run on the feed side.

Let me know if there are any other questions that I can help you with.

Jeremy

So I think I will be definitely porting the oil filter housing to keep the pressure to 70 psi max under load.

 

[matress]

My drain has a very tight radius 90 degree bend in it where it joins to the turbo. That could be part of the problem also maybe?

An oil restrictor has also been mentioned to me... did Jeremy from PTE bring that up?

 

[brisvr4]

You might want to look at getting a 45 elbow for the turbo end and grind the engine mount Matt.
You could even look at using 2 x 45 degree bends to end up with the line pointing straight down, just make sure that they are 5/8 internally.
I cut my stock return line about 40mm from the flange at the sump and that gives a nice curve to the hose without losing diameter.
Jeremy didn't mention anything about using a restrictor so I am going to port my filter housing just to be on the safe side.

 

[matress]

what's involved in porting the filter housing?

what is it supposed to do? lower the max. oil pressure?

 

[brisvr4]

When you port the housing you are actually porting the relief valve section only Matt.
It does help to lower oil pressure because the relief valve actually works as it should once done.
Here is a pic of a ported housing
http://www.galantvr4.org/img.php?id=37172
To get your housing off you need to remove the lower timing cover as there is a bolt hidden behind it :evil:

 

[matress]

Have fun with that! :lol:
I tried to do it once but gave up! I think the crank pulley has to come off too.

 

[brisvr4]

lol, I've actually cut a hole in the timing cover over the bolt that needs to come out. I have a plug that fills the hole nicely.
I already had to take mine off once to swap from water cooled filter housing to the air cooled one that I have now.
I probably should have just ported it before I installed it but everything I read said that I shouldn't have to!

 

[bazeng]

Tim,

remember when porting, do not port too much!
about a 1 - 2 mm overall increase in diametre

if you go to big, you will get to low of an oil pressure....

 

[brisvr4]

Barry,
Is the image that I posted a couple of posts up too much mate?
I might just measure out 1mm and tape it at that point to avoid going too far.
Thanks for the advice mate, I hadn't actually considered the possibility of going too far with it

 

[bazeng]

yeah, don't go by the picture, and just letting you know that the housing is really soft and very easy to over port. I went through 3 housings.

 

[brisvr4]

Sweet, thanks Barry!

 

[EVO-00X]

Why wouldnt a restrictor be used instead of mucking around with the porting?

 

[brisvr4]

Why wouldnt a restrictor be used instead of mucking around with the porting?

If I could find a restrictor that could guarantee that the turbo will see enough oil pressure but not too much I would grab it!

 

[matress]

I don't have access to any restrictors. PTE turbo told me you could run a -3 an line instead of -4 and that will help. Do you want me to send you a -3 line and two adapters to go from -4an to -3 an?

Also some people use nitrous jets as restrictors.

PTE told me that not many people need restrictors on journal bearings. You want to be careful and start restricting only if you are sure that will solve the problem. You could get an in dash oil pressure gauge if you wanted to be sure.

That was from Import Evolution

 

[brisvr4]

Have you done anything about the drain Matt?

 

[matress]

I'm waiting for it to turn up from Import Evolution.

It's a -10an braided hose with 60 degree fitting at the top and straight fitting into the turbo.

 

[brisvr4]

That should help as well.
I would try that first then go the route of oil pressure reduction.
I'm going to keep a very close eye on my oil pressure once I get the old girl running again and try and see what pressure I am hitting at each rev range.

 

[brisvr4]

Just took mine for a short run.
Once up to operating temp I rolled into 3rd gear nice and easy and was shocked to see almost 100psi by about 4000rpm. I backed out of it plenty quick!
At 3000 rpm at light cruise in 3rd I am seeing about 80 psi :shock:
That housing is getting ported for sure now.
BTW I have my oil pressure sender mounted on the oil filter housing itself.
I am actually beginning to wonder if the previous owner of my car had the engine rebuilt at some stage. It seems to run very well for a motor with almost 270000 kms on it.

 

[matress]

Did you notice it blowing any smoke?