whats the deal here. i have a 4 An fitting and now i heard that not enough oil pressure will reach the turbo sacrificing the lifespan. is this true because my oil setup is all done and i dont want to change it again.

 

no, 4-an flows more oil. more flow generally means less pressure. turbos need very little oil so most ppl run 3-an lines. higher psi but less flow.

if you havent done it already. i suggest buying an oil feed restrictor to put on your turbo. i have seen a few cases where teh 4-an flowed so much oilthat it backed up in the chra and blew the seals in the turbo

 

so this actually happens? wow, i did not know that when i bought the kit (oil line kit)

 

oh yea and how do you do the metric conversion

 

you mean, an to inches? well, 10-an is roughly 1/2inch i.d. my 4-an feed line ( the old one) looks to be 1/3 outer diameter

 

ok, i can do the conversions from inches then, but i need to know exactly

 

Why do you need the conversion numbers?

What is your current feed setup and what kind of turbo do you have? does your 4 AN line connect to your turbo via a male 1/8" NPT to male 4AN adapter? if you need a restrictor all you do is buy one from someplace like atpturbo.com All the restrictor is is a female 1/8 NPT to male 1/8" NPT with a small orifice. Screw the restrictor into your turbo and screw your 1/8NPT to 4AN adapter into the restrictor.