SPOHN'S Journal II Track Demon Reborn

SPOHN

Dragons Tail @ ZDayz 2013

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Tward

Bad ***!

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Nismo S - Tune Body Kit/ UAM Fenders / Fast Intentions CBE 12/ Stillen CAI/ PWD JDM Shift Knob/BlueBat Vinyl'
R.I.P Garrett Uekman

Carbon_z

Dude the Z has come such a LONG WAY, great job man!!!!

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SPOHN

Thanks bro. We need to get up. Do a kart day at AMP? Maybe with Z Atlanta?

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Nut_N_Much

Nice, car was lookin good..

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Did new cool science stuff to the car !!!
http://www.the370z.com/mazoc/99606-z...y-14-17-a.html
http://www.the370z.com/diy-section-d...-w-videos.html

SPOHN

Thanks

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Carbon_z

you know it... BTW I still need to flush my tranny fluid hahah

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Full Carbon Fiber Nissan 370z "400zTT" Fully Built 4.0L Twin Turbo 1300hp, 1100whp. Follow me on Instagram at http://www.instagram.com/carbonz.

synolimit

I've never known a race track that will allow this during tech inspection. If the motor blows oil has a direct line out of the motor and onto the track and your headers. I've only known OEM setups with a catch can not vented to atmos to be legal. If the motor goes everything's contained and will run through the motor and crop dust everyone as you blow smoke out the tail pipe. At least then the oils had a chance to burn up a little. Yes throwing a rod out the block will contain no oil but that's if it happens and un-foreseeable. Yes I also know that's not the normal flow of air when hooked up but a blown motor can change the dynamics of the flow. I personally wouldn't run anything to atmos on the track. On the street I do.


Pic?



On other cars I've let it just come out if it needed to; vented to atmos, never had issues. I do think you'd run lean though "if" it were still attached to the manifold because it'd be drawing in unmetered air.

Except the MAF sensor already accounted for the air brought in through the real air filters. That's not fine as pictured because the manifold will now bring in air into the motor from two (4 total) different locations. One metered, one not. Only way it will work is a 100% capped off system letting the pcv's just open from pressure building up behind them, or OEM with a OCC. as stated though, Its not track legal to just let crank pressure blow out to atmos. Oil on the track or headers if the motor goes = burned alive.

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13 370z-

synolimit

The yaw sensor has no bearing on drag racing correct? Must be a lateral force yes?

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13 370z-

Sh0velMan

Yes, but disconnecting or disabling the sensor will disable VDC completely, and cripple the non-LSD cars even more.

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Sh0velMan

I just want to say one last time that if you put breather filters on all four PCV connections, you will have no more positive crankcase ventilation.

Your crankcase will be ventilated, of course, and any pressure build up due to blow by will be relieved, but fuel and water vapor will condense inside your crankcase every time the engine cools and nothing will forcibly remove those vapors while the engine is warming up. PCV exists for reasons other than just emissions, it keeps potentially corrosive vapors from collecting inside your crankcase.

Sam is absolutely correct that it will not hurt anything short term, but think about what is going on inside there over the course of a year or more. Water and gasoline sitting on parts that were never meant to have water and gasoline sitting on them.

I just really think it's foolish to do the "elimination" when you gain absolutely nothing by doing it and cause a vulnerability in the process. Last I'll say on it, I promise.

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synolimit

so even for drag racing it isnt a bad idea then? and i dont always have to push the damn button?

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13 370z-

synolimit

ok than what if you blocked off the rear valve location completely? and left the PCV in place? this way nothing can enter from the rear and when the car is off the PCV is in a closed postition. so nothing can enter in and when enough pressure has build up when running it will force the valve in the PCV to open and vent blow by pressure. i sucked on the valve, it takes no suction at all to open it so blow by pressure would have no issue opening the valve and venting to atmos or a OCC.

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13 370z-

Red__Zed

With FI it's probably smarter to eliminate it than to leave it. You're looking at a very different engine ecosystem with boost.

Sh0velMan

I don't see how.

Every factory FI car I've owned had it, worked fine. Difference all of those systems are draw-through rather than blow-through.

As Syno has pointed out, the valve closes so as not to allow pressure into the crankcase. Under boost, no evacuation occurs, this is normal. Off boost, the system works as previously. We're talking about 8-9 PSI at most on the stock bottom end, so the boost pressure isn't likely to destroy the PCV valve.

I can see how you'd pretty much have to run breather filters though, otherwise the inlet ends up being on the cold pipe (and thus pressurized) since we run blow-through FI on these cars. I can tell you from testing that the car will adjust the idle air bypass to adjust for what is essentially a vacuum leak if you run the PCV vacuum without having it plumbed to the intake tube.

With proper tuning, it could probably be made to work fine, so that's my suggestion:

Breather on inlet, outlet to manifold, drivability tuning to account for the more or less static rate of flow through the PCV system off boost. Static meaning the orifice is always the same size, so you can adjust for it easily. You'll get the good evacuation without the risk of boost pressure causing issues in the crankcase. Win/win.

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