Slowhawk

iTrader: (12)

What is everyone running for a restrictor/size.I'm getting oil smoke at idle and decel and figure it's from the 60psi of oil pressure.

hellbents10

iTrader: (10)

I am guessing you are using a -4. -3 will help. Get the n20 jets out and go from the biggest down.

KraZy

iTrader: (4)

I started and rev'd my car last night. I had oil leaks but no smoke. I have a 4an line to a 3an fitting.

I am concerned about the pressure too.....my aftermarket pump will peg the oil pressure.

fwiw I am running a MP T70.

427

iTrader: (3)

I have a .060 restrictor on my truck. Garrett told me to run between 10-30 psi to the turbo. When I had the engine on the dyno, the .060 would maintain the 10 at idle and went about 40psi at 6000rpm. If I went below .060 my idle pressure was too low. I now have 35,000 miles on the truck, although I have had 3 different turbo's on it for testing I have never failed one from lack of oil.


Kurt

ChevyNo1

slohawk, is it consistent, ie when cold or hot? My car does the exact same thing REALLY bad on decel or idle, but ONLY until the car is fully warmed . . . then not a hint of smoke. I don't understand why it stops!

- Dug

Slowhawk

iTrader: (12)

Yes,it does go by temp but still smokes a bit on decel when fully warmed up.I really have to wait till the roads warm up.Right now it's spinning 4th everytime you get on it at only 8lbs so I can't even tune this in

smokinHawk

iTrader: (48)

how is the return on the oil pan?

W8N2SQZ

iTrader: (6)

Don,

I didn't have any smoke issues on normal driving, but if I got into it (which would spike oil pressure) then get out of it and hit the brakes hard, it would smoke.

The PTK kit comes with a -4 line. Jose said to restrict it so I put a .59 nitrous pill in the line and I drove it last night. So far the problem is gone, but I haven't really gotten into it yet.

EDIT..ooops sorry. This is on a T4 flanged 76 gts turbo.

Just my experience,

Glenn

JZ 97 SS 1500

iTrader: (2)

You can go to as small as .035 depending on the oil pressure. But start big and work your way down. To little oil will starve the bearings.

JZ

ChevyNo1

So .060 is a good starting point? And regular NOS jets will work?

- Dug

frcefed98

iTrader: (16)

.109 Drilled N2O Jet took care of my smoking issue.
I didn't want to start too small when drilling the restrictor hole and starve the turbo. So far its been great, looks like I can even go down in size as well.
J

ChevyNo1

I would think if it fixed your smoking issue I'd leave it as is . . . I'm gonna have to try this restrictor idea and see if it fixes my issue.

- Dug

frcefed98

iTrader: (16)

Yeah guess your right, if its not broke don't fix it The oil drain back is what was really causing me some issues...thats all fixed now as well
J

Slowhawk

iTrader: (12)

-10 to the side of the pan.Above oil level

StoleIt

iTrader: (3)

Where are you putting the restrictor? Right at the turbo or at the beginning of the line by the pan?

HellRaiser

iTrader: (9)

I ran a .093 and it worked great for me.

W8N2SQZ

iTrader: (6)

I put my nitrous jet at the fitting above the oil filter where it feeds out of the motor from.

I think you have to keep in mind that a T4 flanged 76 or what ever can probably take a smaller jet then a T6 flanged GT 42

Glenn

Mark C

Not to hijack Slowhawks thread.

Our turbos came with internal restrictors. You can see them just inside the oil inlets. Limit engineering told me this. Can't be the reason unless yours are modified somehow.

Slowhawk

iTrader: (12)

It would also depend on what the turbo was made for.My GN had oil pressure of 15lbs at idle and 45 at WOT.This car has 50psi at idle and 70psi at WOT which would flow more oil into the turbo

Slowhawk

iTrader: (12)

I would think the restrictor should be at the Turbo