Ok im new to turbo charged cars. Everything I know is about naturally aspirated engines. SO couple of questions.

The downpipe runs from the turbo to the catback?

If the above statement is correct, if u have a catless down pipe do u need to have a pipe installed that runs between the downpipe and the catback?

The charge piping is the piping that runs from the turbo to the intercooler and from the intercooler to the intake?

What exactly is a BOV, where does it go, and what is its purpose?

I guess thats all of them for now, I feel like such a noob for asking these questions.
Thanks for all the help.

 

Technically the down pipe runs from the exhaust manifold to catback, On our cars the cat (one of them) is in the down pipe so no pipe is needed,

 

some car guys like to distinguish and bust ***** about the diff between a Blow-off Valve (BOV) and a Recirculating bypass valve.

The only car that I know of off hand that has an actual Blow-off Valve is the WRX. But yeah, basically the same thing, everyone calls it a BOV.

Anyways, It is to relieve pressure made by the turbocharger.

Remember, Supercharger=intake, turbocharger=exhaust.

 

yeah idk how this car is set up... but if u use a bov when it should have a recurculating valve... technicly you can be hurting preformance ( only for a small time after u shift).... i used to have an audi a4 and it was determened that if u put a bov on them instead of keeping them recirculating than right after u shift the car is waiting for all this are to be forced in so it dumps gas ready for it but when there is not more are that its waiting for ur just dumping lots of fuel with no extra air to help it which actuily decreases the power after shifting and drops ur after shift point into the next gear some( power wise)

So with a turbo car its a bearing with a fan that gets turned by the exhaust gass.. when u shift there is alot of air still being forced into the intake so a BOV is suposed to releave that air by purging it out. but if i am correct ur car has a recirculating valve which after u shift lets the air freely push back into the motor. a BOV is so u dont blow an intake manifold by having to much pressure( but in ur case that wont happen because it has routs around geting the pressure out.

And no the catback bolts right up to the downpipe... it would go Manifold. Turbo. Downpipe. Catback. like a normal car but instead of bolting to the header or manifolt it passes through the turbo first( just passes through the snale and fins that moves the other propellers).

and yes there is cold side piping and hot side piping for charge pipes... Good luck and first thing i would do with it is a tune( people are puting over 300 Hp down with just tunes on there stock car's) definatly look into that.. and if i was to put a name out there i would say tryfecta ( never heard any problems from them.. and good power gains) < best mod for the buck

 

1) Yes. Exhaust goes from the engine, through the turbo's exhaust turbine side (what spins the turbo), through the downpipe, and out the catback.

2) Nope. Downpipe and catback bolt up directly to each other. There's a 3-bolt flange arranged in a rounded triangular pattern on both of them with a gasket that goes in between.

3) Yes. After air comes in the intake, it's compressed by the turbo. Then it goes through the "hotside" charge piping to the intercooler (where it's cooled), and then from the intercooler through the "coldside" charge piping into the throttle body/intake manifold.

4) When you suddenly let off the throttle (such as when you shift) the pressurized air gets stuck in between the (now closed) throttle plate in the throttly body and the compressor wheel of the turbo. The pressurized air has nowhere else to go but back towards the turbo (which is no longer being powered to spin since there's now no exhaust to spin it since you let off the throttle). The BOV/BPV provides a place for the pressurized air to go so you don't back-pressure the turbo's compressor wheel or back-spin the turbo. This means quicker re-spool of the turbo and your turbo's bearings will have much longer life.

It sounds to me like you're catching on pretty well.

 

so when you buy charge piping what do you get? One side, or both? are the sides the same so if you wanted to go HOT and COLD you just buy two sets? Someone explain how this works, also kinda new to turbos's....

 

Well the hot side is the only aftermarket one that is REALLY needed, since it gets heatsoaked, but I have heard that when people are pushing higher boost, like 22PSI, that the factory cold side pops loose. I think its best just to buy one complete set.

 

Injen sells just the hotside chargepipe, that's really the only one you need performance wise. My cold side never popped off at 22+ psi.

If you go with a catted downpipe, find one with a metal matrix cat in it. I believe ClearImageAutomotive uses those. It has been said that the ZZP catted DP uses a ceramic cat and it can't take as much heat.

Catless DP, CIA or ZZP, Hahn, it's all good. ZZP is the cheaper one and the quality is quite good.

 

Charge piping usually comes in a set that includes both the "hot side" and "cold side". The cold side is a bit harder to install and doesn't give as big of a performance increase (in our car's particular case), so some companies sell just a hot side.

The "hot side" is called such because it's the pipe that the air travels through right after the turbo compresses the air. When you compress air by nature it will heat up. To help get the temperature of the air back down for the benefit of engine life and increased performance (as well as keeping engine knock at bay), it goes to an intercooler after leaving the turbo. The intercooler is basically a radiator for air and looks a bit like one too. The air then passes through this to cool itself. Then it goes though the "cold side" pipe (called such because the air's cool at this point after going through the intercooler) and goes into the engine manifold and into the cylinders.

In summary, this is how the air travels: Into Airbox/Intake -> Turbo (compressed/hot) -> Hot Side Charge Pipe -> Intercooler (cools the air) -> Cold Side Charge Pipe -> Throttle Body -> Engine Intake Manifold (enters engine) -> Cylinders

The hot side and cold side are completely different shapes and lengths so they are not cross-compatible.

 

yeah what ^^he said!