Oil restrictor size

[TalonTsi_291]

I've been doin some reading up. I just completed my build. Car has about 100 miles on it. Started the brake in with a 14b. Swapped to a precision journal bearing which I personally had precision install a new center section. Car has no balance shafts. New oil pump with straight cut gears. I ported the filter housing. Pressure is around 50-60 psi cold start, 15-20 psi at warm idle. Cruising with slight load around 3200 rpms pressure is around 50-60 psi. The car wont smoke a puff at idle or cruising. Once I start getting up in rpms and start boosting, it will start to smoke. I have yet to make a wide open pull with this turbo for fear of blowing the seals. I also havent been able to find max pressure or try to fine tune it with spring shortening. Its fed off the ofh with a -4 line from the top port I believe (its a 90 ofh, so which ever was the filtered port). Drain line is -10. I have an aem pressure gauge ran off the unfiltered port. I've seen people suggest a .065" restrictor, I've seen others say .078". Curious if anyone can give me an idea of what I need with the info provided. I bought the -4 female/-4 male .035" restrictor so I can drill to the size needed. I sent justin a pm but I'm sure he is a busy man, as I havent herd back from him yet.

 

[ZombieSix]

Im waiting for my restrictor to come in the mail right now, i am running a 20g which was just rebuilt by justin and he told me to run a 5/64 drill bit through it which will make it .075

 

[TalonTsi_291]

Thanks for your reply. Thats about right in the middle of what I've seen. I just dont wanna go to big, or to small ya know. Anyone else have any experience using a restrictor. Mostly with a precision, but all info is helpful.

 

[My1GLaser]

Make sure your crankcase pressure is in check or you will probably still have issues even with the correct restrictor. I use one of these in line with my PCV valve. Check Valves | U.S. Plastic Corp.

 

[Morphius]

Your drain isn't large enough.

 

[genegoesfast]

I ran a .070 restrictor on my 20g for 10,000 miles with no issue. It would be ideal to tap the oil pressure sender for your aftermarket gauge after the restrictor so you can see exactly what your turbo is seeing in terms of pressure. Every car is different so you can rely on what works on someone else's car to work on yours. The only sure way is to monitor the pressure after the restrictor yourself. -10an drain should be plenty for a td05h based turbo unless its kinked.

 

[Morphius]

Oh, geez. Help if I read the entire post. Was thinking Holset and your running a 14b. Yeah, drain should be fine.

 

[TalonTsi_291]

No I recently switched to a precision. Its a gt3561 (same as a 6152).