Jcrow Posted February 1, 2005 Report Posted February 1, 2005 Is the TGP PCV system different from a N/A PCV? I am still planning my turbo setup, and it occured to me that I dont want to pressurize the crankcase. Where does the tube from the PCV valve go? and does the tube from the front valve cover go to the intake side of the turbo? Quote
LukeZ34 Posted February 1, 2005 Report Posted February 1, 2005 The TGP's PCV system looks to be the same as the NA 3.1. The tube from the PCV valve goes to the underside of the upper intake manifold. The front valve cover tube is connected to the Stock Air box. Quote
Jcrow Posted February 1, 2005 Author Report Posted February 1, 2005 Where on the underside of the plenum? Does it actually go to the plenum or to the 4 tube vaccum plug? Quote
LukeZ34 Posted February 1, 2005 Report Posted February 1, 2005 It has it's own little spot where it goes to the plenum. I don't have a picture on hand, otherwise I'd show you. Someone else might be able to though. Quote
Intlcutlass Posted February 1, 2005 Report Posted February 1, 2005 It's RIGHT under the plenum.... Almost like it's above the fuel rails. That had me stumped too... I can't figure out why they would have designed it like that??? Why couldn't they have just done the same setup as the n/a? Quote
Guest TurboSedan Posted February 1, 2005 Report Posted February 1, 2005 Why couldn't they have just done the same setup as the n/a? they did; the PCV system is exactly the same as the NA 3.1 MPFI. Quote
god910 Posted February 1, 2005 Report Posted February 1, 2005 http://community.webshots.com/photo/123308521/123309985JYrYUz There is a pic of the underside of the manifold. Quote
Jcrow Posted February 1, 2005 Author Report Posted February 1, 2005 Thank you everybody. It looks like I will only have to change the tube from the front valvecover. It currently goes to the throttle body snorkel. If I left it there it would pressurize the crankcase. I will have to move it to the turbo compressor intake to keep a vacuum on it. I see in the jegs catalog they have an oil seperator with a drain on the bottom that looks like it would be a good idea for this tube. I dont want oil getting sucked into the turbo. Quote
Guest TurboSedan Posted February 1, 2005 Report Posted February 1, 2005 Thank you everybody. It looks like I will only have to change the tube from the front valvecover. It currently goes to the throttle body snorkel. If I left it there it would pressurize the crankcase. I will have to move it to the turbo compressor intake to keep a vacuum on it. I see in the jegs catalog they have an oil seperator with a drain on the bottom that looks like it would be a good idea for this tube. I dont want oil getting sucked into the turbo. why not just stick a breather filter in the front valve cover hole? that's what i plan on doing. Quote
Jcrow Posted February 2, 2005 Author Report Posted February 2, 2005 I could do that, but race cars use a vacuum pump or an evacuation system to create a vacuum in the crankcase - it helps the rings seal better. Quote
god910 Posted February 2, 2005 Report Posted February 2, 2005 why not just stick a breather filter in the front valve cover hole? that's what i plan on doing. Josh, I'm going away from that setup. My car as of now has oil all over the front of the engine because of that. The filter is soaked, and althought I'm betting it's because of a bad PCV valve, I'm still going to hook it up right. Quote
Guest TurboSedan Posted February 2, 2005 Report Posted February 2, 2005 why not just stick a breather filter in the front valve cover hole? that's what i plan on doing. Josh, I'm going away from that setup. My car as of now has oil all over the front of the engine because of that. The filter is soaked, and althought I'm betting it's because of a bad PCV valve, I'm still going to hook it up right. how are you going to do it Jay? the original TGP breather went to the air box but i'm going to have a K&N cone stuck on the turbo. Quote
TurboGTU Posted February 3, 2005 Report Posted February 3, 2005 Intlcutlass must have been thinking of the 2.8 which has the PCV hooked to the lower intake. Quote
mfewtrail Posted February 3, 2005 Report Posted February 3, 2005 why not just stick a breather filter in the front valve cover hole? that's what i plan on doing. Josh, I'm going away from that setup. My car as of now has oil all over the front of the engine because of that. The filter is soaked, and althought I'm betting it's because of a bad PCV valve, I'm still going to hook it up right. how are you going to do it Jay? the original TGP breather went to the air box but i'm going to have a K&N cone stuck on the turbo. Drill a hole into the end cap of the K&N and run a tube from the valve cover(w/ a fitting placed in it) to the filter. I'm changing mine as well after reading various posts about that here. I don't have any oil on the front valve cover with a breather in it at the moment though like Jay has...my pcv valve is almost new btw. Quote
Intlcutlass Posted February 3, 2005 Report Posted February 3, 2005 Intlcutlass must have been thinking of the 2.8 which has the PCV hooked to the lower intake. Your right..... My bad.... :oops: Quote
Jcrow Posted February 3, 2005 Author Report Posted February 3, 2005 So the 2.8 and 3.1 attach in different spots? Quote
Guest TurboSedan Posted February 3, 2005 Report Posted February 3, 2005 So the 2.8 and 3.1 attach in different spots? i think so. i think the '89 3.1 (Turbo & NA) attatches to the LIM like the 2.8 does.... Quote
joberlee Posted February 3, 2005 Report Posted February 3, 2005 That is correct, I have one of each type of manifold set. Both are turbo 3.1 upper and lower manifolds. The 90' manifold has the pcv hose on the bottom of the UIM, the 89' manifold has it coming from the LIM. Same part number on both UIMs. Damn GM. Quote
Jeff M Posted February 3, 2005 Report Posted February 3, 2005 That is correct, I have one of each type of manifold set. Both are turbo 3.1 upper and lower manifolds. The 90' manifold has the pcv hose on the bottom of the UIM, the 89' manifold has it coming from the LIM. Same part number on both UIMs. Damn GM. Interesting, I think this info is in the "Difference between NA 3.1 and Turbo 3.1" but with all the TGP engines I have worked on, never had an 89 far enough apart to see this myself, where is the tube run into??....just one of the intake runners :? The 89s I have worked on all just need mild work and/or mod'ing nothing that had me yanking off the upper manifold. And there should be a different casting number on these manifolds, GM may show same parts numbers in their books but casting numbers should be different, and seldom match the part number :? . Jeff M Quote
joberlee Posted February 3, 2005 Report Posted February 3, 2005 If I remember correctly the casting #s matched. I will take a look when I have a chance. I'm using the 89' intake on my 90' TGP because it doesn't have a craptastic red paint job on the top like the original one i have does. I'll post what i find, maybe pics if i can get some decent ones. Joe Quote
TurboGTU Posted February 4, 2005 Report Posted February 4, 2005 The earlier lower has an intergrated manafold undernith it just for the EGR. Has little holes for each port so all get a dose of the PCV. It makes a nice setup for N20 or extra injector or even Alky and watter injection. I think its suprior to the later lower intake. Quote
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