HyperGear ATR25 Build up and Evaluation thread

I'm pretty cut right now.

I didn't know I had to remove the oil restrictors with these turbos...

I would have removed the drivers side restrictor when i fitted the braided line, but the other one I never removed and drilled out.

would this turbo be stuffed...?

 

May be ok still, remove the restrictors asap, and dont drive it if you can help it. Remove your dumps and check them out.

 

Prob still be fine. Better pull the restrictor out NOW. The bearings in these are the same style as Stock turbos.

 

Yeah I won't drive it. I'll probably remove this thing and drill it out tomorrow. how can i check the condition of the turbo by removing the dumps, shaft play?

 

Aren't stock turbos ball bearing? these are thrust bearing...

I duno why this wouldnt be mentioned in the list of modifications needed to fit these turbos though...

 

sucks brad, i never even thought of it

 

Yeah it does... O well I'll see how it goes once I fix this restrictor up.

On the bright side though, worst come to worst, it is the passenger side so easier to remove

 

No, stockies are thrust bearing also.

 

Hang on a minute. Stocks are plain/bush bearing, I thought hypergears were aswell?

If they are both plain/bush bearing, why are people removing the restrictors?

 

oh ok interesting... for some reason I had it in my head they were ball bearing.

So how come these restrictors need to be removed if they are both the same type of bearing?

 

Ball bearing turbos need smaller restrictor hole than stock CAUSE they are ball raced.

Those braided lines are usually made for ball bearing turbos which require A LOT less oil.

Maybe check the restrictor size before you drill it out.

 

has hypergear mentioned anywhere that these restrictors need to be removed? I'm a little confused now as there seems to be varying opinions on weather they should be removed or not

 

wait for the maker to tell you what to do.

 

Probably the best thing to do.

Thanks for your advise though mate.

 

With the oil restriction valve they are made to supply oil to stock turbos, and flow measured from Nissan. How ever its always better to have more oil flow in the sleeve bearing turbo setups assume the drain division is setup correctly in side the turbo core. BB turbos must have the oil restriction valve or its possible to split oil from both ends.

My Mechanic told me my car will be ready comming week. I will go there and take some few photos before engine goes back in the engine bay.

Hoo and we do make BB turbos and carry full range of Garrett turbos. Just price is abit out of most people's bugget.

 

exactly. Normal "sleave" bearing turbos (they're not actualy thrust bearing turbos, they do have a thrust bearing, but the two comparisons are ball bearing and standard sleave bearing or "journal" beaing). so normal sleave bearing turbos are stock, and require a set amount of oil. Which is why the stock restrictors are the size they are.

Beall bearing turbos require less oil, so the restrictors should be smaller, and this is why they should be replaced. Maybe hypergear give specific instructions for their turbo install, but generally, you wouldn't want to restrict the oil flow any more than stock when using a sleave bearing turbo. Doing so will reduce oil flow to the bearing and reduce turbo life. If you don't restrict oil flow to ball bearing turbos further, then I think the symptoms are leaking oil seals into the compressor and turbine housing, and possible bearing damage.

So if fitting sleave bearing type turbos, you shouldn't have to change or remove the restrictors in the stock system.

 

"bush" bearing is another common name too

I just read hypergears response about removing the restrictors, this makes sense especially if turbo shaft speed is increased, more oil flow shouldn't hurt a plain bearing turbo, the only downsize would be if oil pressure/flow is too high, then oil will leak past the seals. I've enlarged stock turbo restrictors on VL's without problems at all. Were all running higher boost though. It seems good theory to increase oil flow if shaft speed (turbo boost) is increased.

 

Even more confused, 2 posts after each other contradicting each other as to weather or not to remove the restrictors lol.

I have 2 questions,

A. At the moment, I have run a max of 13psi through these turbos, would not removing this restrictor have caused any damage at this boost level?

B. Should I remove them or not? lol

At this stage I'm guessing I shouldnt be as worried as i first was...?

 

Yes they are fine. as long as its not blocked its fine.

Also Our bearing housing design is quite different so it can drain greater amount of oil without filling up the whole CHRA. We did that mainly to reduce heat for extreme purposes.

If you drill out the restriction valve on stock turbos they would definitely spill oil out of both seals.

 

I thought since the one on the drivers side was removed by installing the braided line I might as well remove the one on the passenger side too (to allow equal oil flow on both turbos......extra cooling and lubrication etc). The restrictor isnt that small and Im sure your turbo would be getting plenty of oil without drilling it out. I did consult hypergear before removing though.

Cheers
Jason