so we have a car with a -6? feed line whit no restrictor, it smokes if you let it idle longer than like 10seconds. could the feed line be too big?

is it a garrett or hks turbo.if so you need a restrictor that mounts on the turbo,then the fitting for the feed line.i used a -4 feed line to mine(HKS turbo)

its a turbonetics with an s4 center

Thats a BIG feed! I'm using a -4 with no restrictor to a TO4R..



I'd get a restrictor in there Mike. https://www.nopistons.com/forums/pub...IR#>/smile.png

yah i'm leaning that way

You're about to blow your seals, ruin your turbo, and incur great expense and labor, and down-time. Restricots are cheap and E-Z to install. What are U waiting for?

Just curious\, I dont' need one but where do you get them?

4-an....

-4 also

with T67-1

this is an old post, so I guess that using -4AN inlet and -12AN otlet for the oil should be fine right? I am going to be set up shortly with a to4r. My oil pump has had its ports enlsrged and the irons have been ported. plus I have increased the pressure relief valve spring by adding a couple of washers beneath the spring, on the new stock FD spring.

I would nt want any problems with a smoking turbo, apart fro the damage that can be caused since my oil pressure is quite high. I run 3 rotor main bearings thus i added the pressure.



Thanks guys



George

from what ive heard, signofinfinity, -4AN is good. but i do know some people say it isnt.



atpturbo.com has restrictors. i'm still trying to find positive info on if i need one for my t78.



kevin.

damn, and i thought i might have it figured.....



come on guys... so many chaps with to4r and t78....



what is your setup??

1.5mm or a hair under .06 is what I use on everything garret that needs a restrictor on a rotary and seems to be ideal. I have used up to 2.0mm without any big problems on your typical rotary, the only difference being that when the seals are close to being totally dead the turbo starts smoking earlier the bigger the restrictor.



HKaSs (garret) kits for rotaries come with a 1.5mm restrictor. HKaSs (garret) kits for piston engines come with a 1.8mm restrictor. Rotaries tend to run higher oil pressure than most piston motors.

i had that problem,,,,,,,,,,, then was told to go to a -3 line so i had to make a few fittings to make the line work,,,,,,,,, and now i have no issues.

so a -3AN would actually better! that figures to 1.5 mm right? hmmm great then i'll have the braided pipe set up like so... -12AN is fine for return though right?

yes -12 will be fine for a return line. Your not going to worry about oil pressure there since it will be returning to the pan.

thanks guys for the insight.



look forward to get the turbo and start the instal...



https://www.nopistons.com/forums/pub...#>/biggrin.png:D

Damn... my browser just keeps on not updating, and i end up with double posts... sorry guys

-3AN pipe and 14mm Banjo!!



Just got them ready!



Thanks!

Dang I was running a -4AN and it seemed like there was still blow-by. I put a restrictor in there and not problem. Any other advice anyone wants to offer? I am running an AF61 (61mm cold side and a 1.0AR) on a 13b-rew.



Thanks,

David

Well I have no idea if its good,i didnt run the turbo yet! But it seems to work for alot of guys out there, more then the -4AN option.I researched the topic alot, i came up with the -3AN as the most likely solution.

Similar problem here since fitting new ball bearing turbo. However im not sure what size my feed is in dash size, I think its 1/4" ID so that makes it -6?



Ive been reading up over that last few days trying to figure out why all of a sudden Im overflowing catchcan after a few laps. Looks like this is fairly common with bb turbos & too high oil pressure...?



I have made a couple of restricot fittings & teed off a pressure gauge to test with.



THe 1st attempt was 1.5mm restrictor which saw 20psi pressure initally but rose to 40psi (idle) while regular engine oil pressure was 60 psi.



2nd attempt was 1mm restrictor which saw 20psi initally rising to ~35psi (idle).



I figure the oil pressure at turbo inlet is rising as the turbo fails to ingest the volume being delivered?



Now i wonder if reducing hose size to -3 would be a better option than a restrictor?

Turbos really do not need much oil to remain lubricated.



I run a -4 for twin turbos with no restrictor, run really heavy oil, and have had no problems thus far.



I would reduce hose size to -3.

erm, im going to run 125psi race regulator.........on s4 hybrid

this will be very interesting



anyone know what oil pressure the stock turbo likes to see?

and anyone know of a pressure bleedoff regulator or something?!?!

-3AN is good as anything... Ran it no issues, no smoking of seals etc.



I run a 120 psi pressure relieve valve....



-3AN

this is where i get mine from..



http://www.integrated-engineering.org/cata...ex.php?cPath=23