clint78z Posted June 30, 2001 Share Posted June 30, 2001 I am wondering if I should hook the PCV on my ZXT motor. I know that the oil in the intake can gunk up the combustion chambers and mabey cause knocking problems down the road. However if I just vent it to atmosphere won't that cause idle problems since the engine is used to having a vacuum on the crankcase. Not sure what to do. Quote Link to comment Share on other sites More sharing options...
Arif Posted June 30, 2001 Share Posted June 30, 2001 Clint, I have heard that it is not a good idea to vent to the atmo. I know the t3/t4 gets in the way of where the PCV valve is bolted into the intake but I used a smaller pipe that fit the intake and threaded it in. I then used a high temp hose, clamped that end and put the PCV inline as the hose goes down to the crankcase. It worked and in theory should be the same as if it was mounted on the bottom of the intake. Just make sure you mount the valve so that it is straight as if it were mounted on the intake. Hope this helps. Arif [ June 30, 2001: Message edited by: Arif ] Quote Link to comment Share on other sites More sharing options...
GrayZee Posted July 2, 2001 Share Posted July 2, 2001 The computer system on the stock zx turbo is pretty complex and everything is designed to work together. Removing the PCV system may not be a good idea, I've even been told that when I install mine I should leave the emission system alone, and that even the EGR system will allow me to keep the combustion chamber cooler! At first I thought that sounded kinda bassackwards. (how could hot exhaust gases cool the CC?) If you think about it though putting a small % of EGR in the CC dilutes the air/fuel mixture. Seeing that the air/fuel is what creates all the heat in the first place, having less of it keeps the CC cooler and the computer won't automatically retard the timing because the detonation sensor is signaling the computer. Remember that the computer on the zx turbo controls everything, the Auxillary air system, timing, and even the the PCV breather gets its air from the air intake system (after the AFM) therefore the computer measures the airflow from that to! If you were running a programable engine management system then I would say do whatever you want, but seeing that the stock computer is tied into so many systems and can't be reprogramed I suggest you leave everything alone. However this is just my humble opinion. Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted July 3, 2001 Share Posted July 3, 2001 Were teh 280ZXT computers really that sophisticated? I didn't think they were that smart and were primarily analog - no? Wow! Quote Link to comment Share on other sites More sharing options...
GrayZee Posted July 3, 2001 Share Posted July 3, 2001 From what I understand the n/a computers were quite primitive but the zxt comp was much more refined. I guess it had to be to safely manage the boost. I do know it controls the timing and the EGR. There are vacuum control switches mounted under the AFM and the distributer uses a light emitting diode system rather than a pickup coil, either that or a crank-sensor (depending on the year) Quote Link to comment Share on other sites More sharing options...
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