mrfred

iTrader: (50)

TT240Z - Where does this hose go?

06MREvo

iTrader: (90)

^^^Intake??

mrfred

iTrader: (50)

That's what I'm thinking, but want to hear it from TT240Z.

boostedwrx

iTrader: (27)

*edit* n/m

240Z TwinTurbo

iTrader: (25)

Correct

mrfred

iTrader: (50)

In that case, the evac system for sure isn't doing anything. It can't generate any suction on the crankcase if the catch can is hooked to the intake pipe.

240Z TwinTurbo

iTrader: (25)

I would not be so definitive without generating the data. I am not saying you are wrong, but at this point we don't know.

I'll try to hook up the block and evaluate the various configurations to understand what works best.

240Z TwinTurbo

iTrader: (25)

I hooked up the spare port on the DS of the valve cover to the DEFI boost gauge sensor just to do a quick and dirty. Because the DEFI gauge is recordable I was able to go back and review the gauge. I can post the video later if necessary.

With both ports (evac and turbo inlet) hooked up to the can the DEFI gauge essentially says there is 0 - 0.25psi pressure in the crankcase boosting 30psi to 8K RPM. I will repeat by removing both evac and turbo, just turbo inlet, and just running evac to see which one works best. I will repeat using the post turbo backpressure sensor once I calibrate the sensor to some level of vacuum.

240Z TwinTurbo

iTrader: (25)

I removed the turbo inlet and just ran the exhaust evac. Hmmm, pressure crept up to 2psi at 8k rpm and 30psi, which is not the desired response. I then ran just the turbo inlet and saw the same 0 - 0.25psi of crankcase pressure. I can only assume the exhaust evac setup is not doing squat.

The final approach will be to run neither the evac or intake and report back.

evoxsi

iTrader: (8)

looking forward to that info.

240Z TwinTurbo

iTrader: (25)

I unhooked both the turbo inlet and evac and saw pressure in the 0.5psi range so it appeared to be slightly higher than with the turbo inlet hooked up.

I will likely repeat this data using the pressure sensor and data logging through the D200. The only other variable will be whether running two -10an lines from the valve cover makes any improvement over a single -10an line.

I think the best setup will likely be running a -10an (Fairclough) to the can with a -10an line to the turbo inlet. The exhaust evac appears not to generate any vacuum, at least on my setup. The interesting things is that venting to atmosphere with two -10an lines may not be a bad option if your motor doesn't have excessive blowby.

mrfred

iTrader: (50)

Yeah, I see -1 psi at best (throttle lift off boost) when I have the evac line running to a pressure gauge (and nothing else). When I get into boost, I still somehow manage to see +1.5 psi even though I have the Napa check valve installed (and I verified that its working immediately after getting the logs).

I hate to say it, but the Evac appears to generate very little suction. However, despite what I wrote in an earlier post, I have been able to get it to pull some fresh air into the crankcase under some conditions, so I haven't given up on it yet. I'm going to experiment with more tip configurations.

NOMIEZVR4

iTrader: (10)

What would be the downfall of running the pcv valve straight to the intake pipe(which acts as vacuum) with a sealed catchcan routed in the middle and also keeping the other port(side of VC) going to the intake pipe as well? Obviously the port in the IM would be blocked.

This way there would be absolutly no crankcase pressure generated under boost, why wouldn't this work? It would be just like having a pcv setup for a n/a car.

smoke777x

iTrader: (4)

Didnt read throught the entire thread but on my last evo, I setup a gm electric smog pump to pull the vacuum from the crankcase. Got the pump at a junk yard for like 10$, connected 2 -8an lines to valve cover that joined at the pump and dumped the exhaust overboard. This setup worked like a charm. On idle there was actually resitance to remove the oil cap because it was being sucked down by the pump, and once you removed it no oil would splash out unlike when the pump was off. I dont know how much vac it pulled but it sure did the job, never popped a dipstick after the install, and the car ran much smoother because i feel like it was causing the rings to seal better. The oil remained cleaner and didnt smell like fuel.

smoke777x

iTrader: (4)

One more thing is that i believe its bad to run the pcv system connected back to the intake, because all of the fumes that are being pushed out are going right back in to the engine and lowering your octane rating. You might think that the catch can is stopping that but all its doing is catching only some of the oil that got pushed through.