i bought an ebay oil line kit and it came with the 4an feed line and the flange with the 4an flare already on it. it had a tiny *** hole on it where it bolts to the turbo and my friend said ur supposed to drill it out to be bugger but i think i drilled too much. i kno people use 3 an restrictors but will that be compatible with the 4an feed line? or should i jus buy another feed line flange and re-drill? what size should i re-drill it to?

 

i dont think you should be drilling anything. it sounds like the turbo came with a -4 line with built-in restrictor, which you then ruined. i would just get a new restrictor. it would probably be more expensive to get new -3 fittings and line.

 

yea im pretty sure ur right. i jus ordered a new one from function 7. thats wat i get for listening to other people before doing my own research. it wasw a built in 1/16" restrictor. is this the best size or should i bore it to a 1/8"? my turbo is a turbonetics t3/t4 journal bearing

 

nobody knows what size the opening should be?

 

dude relax..its been 2 hours. call turbonetics and see what they reccomend for their turbos or better yet take 2 seconds to look at their website. i found this in under 30 seconds...

Q: How is a turbocharger lubricated? Where does it come from?
A: A turbocharger is lubricated with regular engine oil. It comes from anywhere that you can provide clean filtered oil to it. Usually this is anywhere after the oil filter, before the oil gets to the block. Many turbochargers are oiled however from a fitting tapped into the block itself. As long as you have filtered, cool, and sufficiciently pressured oil your turbo will be happy. Note: Oil PSI should be at least around 20-30 PSI at idle and 50-70 psi under boost. Race applications do not apply here.

Q: What size oil inlet and oil drain line sizes should I run for my turbocharger?
A: Turbonetics recommends no larger than a -4 oil inlet line and no smaller than a -10 (1/2") oil drain line. For most street vehicles a -3 (1/8") is ideal and if a -12 line can be accommodated for the drain even better. NOTE: For racing applications and large frame turbochargers ie. Y2K and Thumper units, a -4 is perfect to accommodate the extra oil capacity and pressure that these units are usually faced with.

 

k thanks but im trying to figure out what size hole it should be not the AN size. i have a 4an line so im trying to figure out what size the restrictor hole should be

 

well since turbonetics doesnt mention restrictors you will need which ever size makes the turbo get 20-30psi at idle and 50-70psi at WOT. it could be different for each application (engine, oil source, etc.)

also turbonetics is recommending a 1/8" line so i would thin a 1/8" restrictor would also work

 

ok cool that makes sense, any suggestions on how to calculate oil pressure. recomendations on oil pressure sensors/guages? dont wanna spend toooooo much..