Homebrew turbo...

[greenspeed]

I have a stock pile of parts from Subaru's laying around and got to wondering on an idea and wondering if it's been done.

I did a search and really didn't find what I was looking for and even looked at a few turbo kit manufactures sites to see, and still nothing.

Your typical turbo requires oil and coolant to be proper (imo). The coolant problem is easy, take the pressure side and have it feed to the turbo and route back, fairly simple.

The oil thing I have thought up a little. Has anyone tapped the oil reservoir with a dry sump pump fed the turbo and threw the oil back into the reservoir after going through a filter. Location of the pump depends too, cause not sure if it'd be better as a push or a pull in the situation. Think it would be better off as a push.

Anyways. Wasn't 100% sure where to put this and was kinda of a "what if" isn't brand specific. Only got to thinking about this the other night too...so ideas may not be fully mature.

 

[greenspeed]

okay, so took some time, but "technically" it's not a dry sump pump, but I found the ideal pump for this...

http://www.aliexpress.com/product-f...oling-plate-EXPRESS-SHIPPING-wholesalers.html

 

[Wheel House Motorsports]

good luck finding a pump to run oil through a journal bearing and keep the pressure high enough. most people run ball bearings as the cost is the same compared to journal bearing with high pressure pumps.

heck, i know plenty of people not running coolant on 2 strokes. we dont get the turbos that hot compared to 4 strokes. but also, oiling on a 4 stroke is a different story. its already there for you!

 

[turbolover]

okay, so took some time, but "technically" it's not a dry sump pump, but I found the ideal pump for this...

http://www.aliexpress.com/product-f...oling-plate-EXPRESS-SHIPPING-wholesalers.html

0.7 bar pressure is about 8 psi. Maybe enough pressure for a ball bearing unit but not a journal.

What kind of sled you putting it on?

 

[greenspeed]

Guess I need to drop some background on this since this was all hypothetical lol.

There isn't a sled in mind. It would go on something that is EFI, only because I believe satan invented carburetors and they are pure evil. Why should I have to take something apart to get the fueling right when I could plug in my laptop and adjust it without having to take half the thing apart.

That being said, most of this hypothetical would be using parts I have laying around from wrx's that have gotten upgrades. So I'd be using a stock wrx turbo, which is a TD04 journal bearing type. It would need an oil supply. Also if it craps out (which it will) it's only $100 to pick up another used on, they are incredible easy to find, and I have a buddy who owns a performance shop and has about 20 sitting on a shelf that are all fine. Hence why experimental.

A TD04 doesn't require a tremendous amount of oil to stay lubricated. I also am not sure injection oil would make a decent oil lubricant. It's made to burn, so maybe the break down would take place at a temperature the turbo would be running in.

The idea/goal is to put together a functional kit for a considerable amount less than one on the market. Call me cheap, but the $$ for some kits is crazy to me.

 

[greenspeed]

0.7 bar pressure is about 8 psi. Maybe enough pressure for a ball bearing unit but not a journal.

What kind of sled you putting it on?

On a vehicle application I've ran journal turbos over 20psi. The bearing material adds longevity and easier spooling. It has no direct effect with PSI. The compressor housing, compressor, and fin design has a larger impact.

 

[1Fast68]

On a vehicle application I've ran journal turbos over 20psi. The bearing material adds longevity and easier spooling. It has no direct effect with PSI. The compressor housing, compressor, and fin design has a larger impact.

He's referring to oil pressure to feed the turbo, not boost.

 

[greenspeed]

He's referring to oil pressure to feed the turbo, not boost.

Ah okay I saw what he was talking about in the product description on the pump.

The pump comes in a few different pressure variances and can't see how you'd need more than 15 psi which is the 'H' model

 

[Wheel House Motorsports]

Ah okay I saw what he was talking about in the product description on the pump.

The pump comes in a few different pressure variances and can't see how you'd need more than 15 psi which is the 'H' model

its a journal bearing. run it at 15# of oil pressure for a while and tell us how it works out.

if you monitor oil pressure on one in a car, its gonna be 15 MAYBE at idle, but under any load your gonna be 40+ easy.

this would not be a bad turbo for a low boost 4 stroke setup, but for anything 2 stroke. not worth it. way to small to even be worth putting it on.

 

[Matte Murder]

Do you think it will cook and degrade the oil in the resi? I know turbos are known to coke oil and that would clog up an oil injection system fast. Seems like the only bonus is not having to do a separate oil tank for the turbo which is probably the easiest part of the whole deal.

 

[greenspeed]

its a journal bearing. run it at 15# of oil pressure for a while and tell us how it works out.

if you monitor oil pressure on one in a car, its gonna be 15 MAYBE at idle, but under any load your gonna be 40+ easy.

this would not be a bad turbo for a low boost 4 stroke setup, but for anything 2 stroke. not worth it. way to small to even be worth putting it on.

It's what I got to really thinking about. Most of the 2 stroke sleds are going to be pushing 8K and typically this turbo sees 6-7K revs max and even at that not for the long periods a 2 stroke will be at or above that range.

Do you think it will cook and degrade the oil in the resi? I know turbos are known to coke oil and that would clog up an oil injection system fast. Seems like the only bonus is not having to do a separate oil tank for the turbo which is probably the easiest part of the whole deal.

Exactly what I was wondering myself. It would make a great deal of sense to run a separate tank then, I wasn't sure on the break down of injection oil or the lubrication properties of it.



Think this idea is basically fully covered. Doesn't seem remotely possible based on all the insight so far, thanks for not just discrediting it all to being with and actually adding insight everyone.

 

[Wheel House Motorsports]

It's what I got to really thinking about. Most of the 2 stroke sleds are going to be pushing 8K and typically this turbo sees 6-7K revs max and even at that not for the long periods a 2 stroke will be at or above that range.

yeah, the 2 stroke injection pump also puts down nowhere near the injection pressure that a oil pump on a car does. half the bearings in a car motor are journal bearing so it NEEDS the oil pressure at all time to stay alive. the 2s injection pump is just enough to mist things.

your heads in the right place but the parts arent. if you wanna put together a kit, read, look, learn, read again, and plan to spend a lot more money then you first set out to, have plenty of growing pains and possible upset. but if your willing to learn from it, homebrew setups can be a lot of fun and you can learn a ton, and maybe even show the boys with off the shelf stuff how its done. if you get a sled in mind that you wanna boost.. post it up, lots of good guys who know there stuff and wanna help.

 

[greenspeed]

yeah, the 2 stroke injection pump also puts down nowhere near the injection pressure that a oil pump on a car does. half the bearings in a car motor are journal bearing so it NEEDS the oil pressure at all time to stay alive. the 2s injection pump is just enough to mist things.

your heads in the right place but the parts arent. if you wanna put together a kit, read, look, learn, read again, and plan to spend a lot more money then you first set out to, have plenty of growing pains and possible upset. but if your willing to learn from it, homebrew setups can be a lot of fun and you can learn a ton, and maybe even show the boys with off the shelf stuff how its done. if you get a sled in mind that you wanna boost.. post it up, lots of good guys who know there stuff and wanna help.

For sure, decided to go back for my Masters so maybe a bit before things come to life.

However it'll probably be something in something that it doesn't belong in, that's sort of my style.

 

[turbolover]

You can build your own turbo setup.
I know I did it. It definitely is a steep and sometimes tough learning curve. Be patient and read everything you can get your hands on and talk to everyone that will give you the time of day on it.

Right now im without a turbo. Maintaining 2 kids and 3 sleds doesnt permit my budget to support a turbo for a couple more years. I will have another turbo sled in the future but for now i just get to drool on all of the new stuff out there.