Stock rb25 just bolt on parts 480 hp

[wolf92]

[smoked240]

Looks good! lets have some more info boss, What turbo? Which fuel pump do you have?

[seagrasser]

PCV is not run all that correctly. Left hand side is correct, but right hand side gases never go through the can

[Kingtal0n]

Yes, the pcv needs to be fixed right away. emergency. you are pressurizing your crank case above atmospheric pressure and leaving the gasses of combustion no where to run. They are putting pressure on your oil seals.

also welcome to 1997

[Bleakley]

Originally Posted by Kingtal0n

Yes, the pcv needs to be fixed right away. emergency. you are pressurizing your crank case above atmospheric pressure and leaving the gasses of combustion no where to run. They are putting pressure on your oil seals.

also welcome to 1997

Looks to me like it's vented to atmosphere... Should work just fine?

[seagrasser]

Agreed, won't over pressure either side since it is vented, but there is no vacuum drawing blow by out either.

[Kaifd3s]

Big up for a fellow Trini

[supersayianjim]

anyone have a pic on the CORRECT way it should be routed??

[Kingtal0n]

Originally Posted by seagrasser

Agreed, won't over pressure either side since it is vented, but there is no vacuum drawing blow by out either.

So this is a common misconception, and its pretty easy to oversight so very common.

Yes the catch can is "vented" but to where? the atmosphere.

And what is the pressure in the atmosphere where he is? lets say sea level, 14.5PSI (pick any number)

Now, for molecule to move from the engine to the "catch can" there MUST be a greater pressure at the crank case.


So if the pressure is higher at the engine's crank case than in the atmosphere we say it is "pressurized", that is, a higher pressure with respect to the atmosphere. That means during boost ALL of his oil seals, including piston rings, front main, rear main, everything is being pushed outwards towards the atmosphere.

And to tie a pretty knot in this detail, a common theme for V8 engines producing 600+ horsepower is to provide additional sealing/strengthening of those oil seals, such that an external belt driven vacuum pump can provide a high vacuum situation inside the crank case... for many reasons, among them, additional power. The point is those oil seals would get sucked right into the engine, or blown out, depending upon the pressure in the crank case. Having a slight vacuum provided by a functional PCV system helps to keep the oil INSIDE the engine, as one benefit, and there are others as well.

I would run the forward line to a can and then back to the turbocharger inlet,
and the rear line directly into the downpipe.
You will want a restrictor in the forward line if doing it this way. Like the factory uses.

[supersayianjim]

pics pics pics!!

[Kingtal0n]

http://www.nicoclub.com/archives/rb-...her-guide.html

http://forums.nicoclub.com/how-to-se...b-t403897.html


into the exhaust


into the turbocharger


I recommend both at the same time, use a restrictor on the turbo side, use the shortest lines possible, angle the fittings properly.

[Purestock240]

really curious what this setup all consists of

[supersayianjim]

ahhhhh!!!!!!!!!

[KAT-PWR]

Originally Posted by Kingtal0n

http://www.nicoclub.com/archives/rb-...her-guide.html



into the turbocharger


I recommend both at the same time, use a restrictor on the turbo side, use the shortest lines possible, angle the fittings properly.

This set up seems counter productive. The can is vented so there will be less draw from the crank case as the turbo will be pulling air in through the vent. Ideally the can would be closed to allow full vacuum from the turbo evacuate the crank case.

[G-E@Z31P]

That does seem like someone's poor understanding of theory, venting it into the exhaust and hoping the venturi effect will suck out extra gas would require a huge conical exhaust with literally no restriction... something I doubt many people can duplicate

With a catch can stripping oil from the vapour, it could be routed back in front of the turbo to give true suction, but if the turbo sucks too much, that could end up sucking more oil vapour out of the crankcase

Leaving it open to atmosphere as in the first post avoids most of the pitfalls, without being particularly good or bad, any blow-by pressurization is minimized, but no extra ring sealing is generated

[Kingtal0n]

Originally Posted by KAT-PWR

This set up seems counter productive. The can is vented so there will be less draw from the crank case as the turbo will be pulling air in through the vent. Ideally the can would be closed to allow full vacuum from the turbo evacuate the crank case.

true.

It was just a random google image to show how to route the lines. You are correct in your observation that the atmosphere should NOT be allowed to enter the PCV system, except right at the turbocharger inlet, and even in that place there are counter measures (several restrictive points on the OEM design) to prevent the atmosphere from having a large influence.

Originally Posted by G-E@Z31P

That does seem like someone's poor understanding of theory, venting it into the exhaust and hoping the venturi effect will suck out extra gas would require a huge conical exhaust with literally no restriction... something I doubt many people can duplicate

With a catch can stripping oil from the vapour, it could be routed back in front of the turbo to give true suction, but if the turbo sucks too much, that could end up sucking more oil vapour out of the crankcase

Leaving it open to atmosphere as in the first post avoids most of the pitfalls, without being particularly good or bad, any blow-by pressurization is minimized, but no extra ring sealing is generated

Exhaust style PCV is used with great success on many different kinds of engines. I myself have used it on a twin turbocharged V8 chevy engine and you can literally feel it working even at idle.

Leaving it open to the atmosphere is a worst case scenario. It is literally the least amount of work and plumbing.

[ANVIL]

Modlist details? What kinda gas

[Kingtal0n]

I have one for you, not my car but a close friend's




Stock RB25 neo Engine
Precision PT 6776 turbocharger
25PSI + race gas 550~ RWHP

Lasted 35~ runs then the oil pump flew apart

[Kingtal0n]

He also had this




stock engine stock skyline

The RB25 is a taxi-cab engine, I would never try to squeeze power out of one, there are better options in the same price range. It's different if you already have one and you don't care if it flys apart. But how did you even wind up with it to begin with? poor planning.

[MR_GUTTI]

Originally Posted by Kingtal0n

The RB25 is a taxi-cab engine,I would never try to squeeze power out of one, there are better options in the same price range. It's different if you already have one and you don't care if it flys apart. But how did you even wind up with it to begin with? poor planning.

^^^ Really?

[Sforteen]

Originally Posted by MR_GUTTI

^^^ Really?

Most of the shit that guys posts is retarded, dont pay any attention to him..

Strange you damaged the oil pump, that engine should have the longer oil pump drive on the crank, Neo's are great engines, stronger than normal Rb25's and solid lifter!

Stay off the limiter and make sure that Crank pulley is torqued properly and in good shape!!

[BoredEE]

Originally Posted by MR_GUTTI

^^^ Really?

The modular ford 4.6l is literally a taxi cab engine and EVERYONE knows its a horrible idea to try to squeeze any power out of that engine. Anyone who has one always swaps out the SOHC version for a DOHC version. Like OH MY GEWD.

[/SARCASM]

[ANVIL]

So..... i wanna know OP's setup