So whats the deal with restricting the oil pressure to a single turbo?

I have been reading that they have a correct/designed pressure level that is lower than what the stock system puts out.

The turbo distributor did not supply me with a regulator, nor did he mention this to me.



Could we clear this up?

What should be done to supply the correct pressure to the turbo housing?

Pressure reg, or a restrictor fitting any ideas guys?

What are the correct pressures for the turbo, and what is the engine supplying?

i've heard as long as you run -4an or -3an line you should be fine.... i am running -4an line to my turbo... my turbo has a metal filter not a restrictor so i am hoping it will be ok



harrison

So dose no one have problems with the turbo blowing oil through the seals because of excessive pressure to the housing?



Using a –4 or – 3 line should not decrease the pressure to the turbo housing if I am thinking correctly about how it is run. You would have to somehow increase the velocity of the fluid going through that line to cause the pressure to drop if I am correct.

I know for a fact that you are supposed to have a restrictor, or small diameter inlet line. when you start up an FD cold the oil pressure is around 100psi which is too much for a turbo to handle. I was told this by many a wise rotary tuner

Hmm, wouldn't a restrictor increase pressure? Maybe you're talking about volume?

A restrictor will slow down oil flow therfore reducing oil pressure in the turbo, as for you may encounter back pressure from the oil in the line to the tank.

LOL... I posted a similar question but couldn't quite figure out how to ask it... https://www.nopistons.com/forums/pub...IR#>/smile.png Good info guys!

It would if you were to put the restrictor after the turbo in the flow path.

Before the turbo you would have the ability to only allow a certain amount of fluid through a set constant area allowing for the pressure to be lowered in that area.

Very much like the expansion valve in a A/C system.



So does anybody know what the correct pressures are for particular manufacturers?

I believe I heard that the stock system puts out around 90Psi at a high RPM and the general idea is that the turbo is designed for around 60 Psi.

Is this correct?

Wouldn’t the turbos have a particular pressure that they are rated for?



I have the GT3540 and I haven’t heard of any problems resulting from people running them the way they got them from the distributors. Although I would like to find out more about this topic if possible.



Thanks for your ideas guys https://www.nopistons.com/forums/pub...IR#>/bigok.gif

I was told by cheapturbo that my T04s needed to see around 30-40psi. Instead of a restrictor (no place local to find or even know what the hell I was talking about) I used a needle valve from a Hydraulic shop. It's adjustable and I just screwed it down about a 1/4-3/8. So far so good.

i have a 60-1 (t04s) and i just called turbonetics and they said that i don't need a restrictor... the little metal filter is fine... otherwise i might starve the bearings... i also told them i plan to run a 4an feed line and they said that was fine also so.....



ps this is vspecpgt.... to avoid confusion...