Turbo compression side spitting oil. *SOLVED

Basic tech questions such as future setups, different turbo kits, car diagnosis, etc
Sepshadow21
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Post by Sepshadow21 »

I have no idea what you just said... Lol jk
I came across some of those terms while reading up on the afc.

But idk how any of this stuff works.
I keep seeing "maps" and other terminology.

It would be awesome to be able to work with all of them and get some real experience tuning stuff. That would be awesome.

I really want to learn this stuff but idk anybody here that does that stuff and is willing to teach.
Sincerely the noobie
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Kamilitaryman
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Post by Kamilitaryman »

Sepshadow21 wrote:Alright after some more hair pulling and research I read that
once the pipes were connected that the pressure would help with the compression seal.
That is the only plausible explanation.

The drain is superb.
The feed is right.
And the seals are new.

I'm going to strap everything together and hope for the best. Lol
This is my first turbo experience.... Ever
I have injector and fuel pump that needs to go in and flash and chip ecu. Then wideband arrangements.
Am I forgetting anything?

Planning on doing pistons in the future and head gasket when I get better head bolts.
Maybe an izuzu rodeo or pathfinder rear end too.
I just read some interesting info on this matter. This is posted directly from my local forum, NYSpeed.com:
newman wrote:In their simplest form, hydraulic systems (which is what you're dealing with) are VERY similar in nature to electrical systems (excluding fluid effects like non laminar flow and blah blahblah), so think of this like this.

Image

Pressure is voltage
Current is flow rate
Resistance is... well resistance to flow from the turbo bearings or the restrictor

The positive battery terminal is the oil pump.

The negative battery terminal is the sump.

The first resistor is the restrictor. You could determine a fairly linear range for the restrictor. Ex: at 10psi it flows 1 gpm, at 40 psi it flows 4 gpm, so the "resitance" is (40-10)/(4-1)=10psi/gpm

You could do the same for the turbine bearing.

So in order to find the pressure at the turbo bearing you would find the flowrate of the entire system first:

Which is I=V/(R1 + R2)

And then substitute that into the formula for drop across a resistor which is

Vr2 = I*R2 = (V*R2)/(R1+R2)

Try and think about it like this:
Imagine the lines are totally empty before you have pressure at the pump. You start the pump and you have 40psi at the pump and when the oil reaches the turbo bearings it has 40 psi as well. There is 40 psi at the turbo bearings and whatever oil can squeeze through there at 40psi is the flowrate you will get. Flowrate A


Now imagine the pump creates 40 psi and the instant the pressure hits the restrictor the pressure is 40psi on the oil pump side of the restrictor and 0psi on the turbo side of the restrictor. This will have a flowrate B, which we both agree is less than Flowrate A. Well the pressure on the bearings is still zero until the entire cavity fills with oil, at which point the pressure here begins to rise from zero to a point where flowrate B can squeeze through the bearings. This pressure will be much less than 40psi. Now what happens is that since the oil is seeing MORE restriction total, the flowrate goes down even further to flowrate C. Well this new flowrate means that even LESS oil needs to squeeze through the turbo bearings so the pressure required goes down even more. This ultimately balances out and converges on a flowrate (represented by the equations above).

If that doesn't make sense I have another analogy. Haha.
Are you running a restictor in your oil feed line?
PM me if you're interested in getting something powder coated!
Sepshadow21
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Post by Sepshadow21 »

Yes I have a .060 restrictor

Oil pressure is at 60-70 and you add 10 psi to 1000 rpm right?

So at 3k it's 90-100psi

5k 110-120psi
(I don't like hitting my rev limiter, or going higher than 5k)
Sincerely the noobie
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schmauster920
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Post by schmauster920 »

what kind of oil are you running? thats pretty insane. I have about 20psi at idle and its correct lol
D21, Built KA24DE, 740cc, T4, WeatherGuard Tool Box, Tial 40mm, Megasquirt 3 in progress
Sepshadow21
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Joined: Fri Apr 05, 2013 11:52 pm
Location: Arizona

Post by Sepshadow21 »

Sorry wrong info lol

I haven't checked it.
I assumed it was that but I had the figures wrong on my guestamation.

My fsm says 3000 rpm should be 60-70 psi

I'm pretty sure my truck is at that. I could be wrong.
Sincerely the noobie
Sepshadow21
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Post by Sepshadow21 »

Idle speed should be 11
For a 93*
Sincerely the noobie
Sepshadow21
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Post by Sepshadow21 »

Hey Brian,

Can I see how u mounted and piped ur intercooler?
Sincerely the noobie
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schmauster920
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Post by schmauster920 »

yeah the motor is out, ill snap some pics today
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schmauster920
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Post by schmauster920 »

Image


It hooks into one side and then its held in with a hose clamp on the pipe outlet on the other

Image

Image
D21, Built KA24DE, 740cc, T4, WeatherGuard Tool Box, Tial 40mm, Megasquirt 3 in progress
Sepshadow21
Driving Mom's Station Wagon
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Joined: Fri Apr 05, 2013 11:52 pm
Location: Arizona

Post by Sepshadow21 »

Sorry I haven't been on here for awhile. I have my intercooler mounted.
I just need to buy a couple elbows from ebay cus all the sizings were different. So I'm ordering reducing couplers soon.
Then I have to find a hat to fit on the truck TB.
Then wire the afc and install the rx7 injectors and the 255 Wally pump.

Should be done after that.

In the mean time... Still leakin oil everywhere.
Sincerely the noobie
Sepshadow21
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Re: Turbo compression side spitting oil.

Post by Sepshadow21 »

After a long loong time I am finally updating this.
No more oil coming out of the cold side of turbo.
The back pressure helped seal the seals on the turbo.
But I learned that having no back pressure is bad because the turbo will spin abnormally fast.
Hope this helps somebody in the future!
Pm me if you have further questions or post here.
Sincerely the noobie
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schmauster920
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Re: Turbo compression side spitting oil.

Post by schmauster920 »

Sweet, thanks for updating.. how miles are on the setup?
D21, Built KA24DE, 740cc, T4, WeatherGuard Tool Box, Tial 40mm, Megasquirt 3 in progress
Sepshadow21
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Re: Turbo compression side spitting oil. *SOLVED

Post by Sepshadow21 »

In the turbo set up? About 9000 miles.
I still have yet to finish.
Fingers crossed on this weekend!
The wastegate wouldn't close.
I then stuck a manual boost controller and it boosts now.
Sincerely the noobie
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