Turbo BS Thread

How? If you let the rear vent and keep the PCV stock, your intake will pull air in via the rear vent, through the crank, and into your intake manifold without getting metered by the MAF sensor? How do you maintain a proper idle?

 

The rear is just a vent. All the stock configuration is doing, is plumbing the oily blowby gas back into the intake. If you remove the rear vent, you will feel there is no vacuum on it. It just vents blowby. On stock ECU my fuel trims were perfect. Now with AEM and 550s ltft are perfect. Stock PCV, stock routing, just venting the rear to atmosphere, rather than plumbing it back into the intake. Try it, you may like it

 

I had an intercooler put in my truck, it mad a big difference in running temperature.

 

Your going to have to show me a picture of how you have it setup. Something doesnt seem right, your explanation or my understanding.

 

I'm not certain my understanding is correct either. I just know in 4 years of turbo and running it this way with 4 different trucks with stock and aftermarket ECU both, it's been flawless. PCV is in factory configuration. But instead of the large diameter hose going from rear vent back to intake (which isn't really possible with cold side pipe anyway unless you make a bung for it), just cut the hose off a few inches and let it vent. I'll try to snag a picture later, but it's underwhelming.

 

So how i understand it, that rear vent allows air to enter the crank. When your PCV is under vacuum (connected to the intake manifold, It will suck air through the rear vent to keep "fresh air" flowing through the block. The issue is, if I'm correct in my assumptions, that becomes a new "air intake" but not metered by the MAF... I can try running it to the stock position and see what my truck does...

 

And all of this debate is why I say to disconnect the PCV system from the intake. Not all PCV valves work well as check valves, especially when they came on cars that were N/A to begin with.

On a top mount s/c application the force air induction is post throttle body. The vacuum sources are all between the throttle body and lobes. Except for the boost port. Which is after and see vacuum and boost.

All of those hoses see vacuum then ludicrous vacuum. PCV can easily be left alone.

On a centrifical or turbo app, all of those post TB hoses see vacuum AND boost. Thus creating a scenario where ring gap blow by gasses pressurize the crank case while simultaneously boost air flows into the crank case from the valve covers. Those gasses then fight against each other because they cannot escape. This causes oil to come out wherever easiest.

Removing intake manifold to valve cover connecting hoses allows the ring blow-by to vent out of the valve cover. As long as you have a large enough fitting for it to flow out quickly enough, depending on boost level. -8 to -10.

Valve cover to catch can with breather. Simplest.

Breather ( fresh air inlet) on valve cover to outlet hose on valve cover to catch can to pre turbo.

Breather to outlet to catch can to angled exhaust port (post turbo).

 

I'm in emails with Radium Engineering right now. They said it's a hard rule that a pcv is only used if going to intake, if ever going to pre-turbo then should always be deleted.
I asked if after deleting the pcv if the AOS-R inlet should remain at the pcv port and the crank fresh air port remain filtered to atmosphere, or plug the pcv port and route the AOS-R inlet to the crank fresh air port; they replied either will work but preferred to plug the pcv port and route the AOS-R inlet to the fresh air port.
My last email to them is concern about gases traveling up the drain line to the AOS-R, bypassing the baffles and going out to pre-turbo without removing any oil- why would the gases go to the valve cover port instead? I believe this is why I'm having oil at the oil filter.

 

Ahh the suspense. Like watching a good mystery show.

 

These hot boys should put a little more load on the motor and quicken the spool

Maxxis Buckshot II's in 265/75/16 will be going on tomorrow. Definitely excited to get some mud terrains on in time for summer/beach/offroading season!
Simple Tire was having an awesome sale on these, and they've gotten good reviews from a few local people with Jeeps that have them. Less than $600 out the door for all 4!

 

Holy smokes!!!! Those will fit as is?

 

Yeah, 265/75 is the max you can run with no lift. The current tires are Hankook DynaPro ATM's in a 265/75. I removed the front mudflap, and trimmed a little bit of plastic from the fender liner since my wheels have a decent backspace and offset to them, so they'd rub at full lock in reverse (backing out of a tight parking spot usually).

I'll see how these wear, but I'm excited to really see how they make the truck look and perform on our property upstate NY.

 

I think people run 255/85 on stock suspension... I am at the 1.75 notch on 5100 but seems like there are people in the 255 thread on stock setups

 

Also bravo to maxxis for actually changing the buckshots in this 2.0 unlike bfg haha

 

Just reiterating, stock suspension vs 3" lift will clear the same tire. Nothing changed with how much the tire can articulate up into the wheel well. If you never "flex" the suspension you can get away with bigger tires with a lift but once the curbs get bigger you'll rub.

 

That's interesting to hear. I know on my old 4Runner with the 22RTE turbo engine the pcv went from the valve cover to the intake tube post MAF and pre turbo. But that's obviously a stock factory turbo setup. I remember still getting some oil vapors in the turbo so I added a small catch can.

 

I think they were between a rock and hard place- knew should route that line pre turbo since turbo but required to have the pcv by regulation. That’s an aftermarket rule, not OE rule

 

Yeah, but a stock turbo engine has different compression and rings than a NA engine so there probably isn't as much oil blowby.

 

Radium got back to me, said that if there's oil in the drain it will pose a restriction and force the gasses to take path of least resistance, which is the desired path. If there's no oil in the drain line and the gases take this path the oil will still be separated, apparently the inside of the can is not exactly how they have it pictured on their site (and what I was going off of). Their bare instructions do say that the top and side port are interchangeable, however they don't go into any details. Maybe I can take a few fitting and make a trap on the drain line haha, or extra length hose and let it hang below the port.

 

Ok, so plugged my pcv port and running 5/8” port to AOS-R.