nismopu Posted October 17, 2006 Share Posted October 17, 2006 I have a hybrid garrett t3/t4 and the auto 81 zxt engine with the larger pump. I was told buy some people that I should run an oil restrictor(.064?), Is this true? peace. Quote Link to comment Share on other sites More sharing options...
naviathan Posted October 17, 2006 Share Posted October 17, 2006 ... Quote Link to comment Share on other sites More sharing options...
lucky Posted October 17, 2006 Share Posted October 17, 2006 This interests me. Is this something specific to the L Series motors? On my FWD SR20 I had to run a restrictor before the turbo to reduce pressure within the bearing housing. Quote Link to comment Share on other sites More sharing options...
spotfitz Posted October 17, 2006 Share Posted October 17, 2006 A simple search revealed: http://forums.hybridz.org/showthread.php?t=104828&highlight=OIL+RESTRICTOR Which discusses the use of an oil restrictor to the oil feed line going to the turbo, in relation to an L series. Quote Link to comment Share on other sites More sharing options...
lucky Posted October 17, 2006 Share Posted October 17, 2006 Yeah that thread talks about it in the manner that I used it. I'd never heard of putting one after the turbo as mentioned before, that's what I was curious about. Quote Link to comment Share on other sites More sharing options...
TimZ Posted October 17, 2006 Share Posted October 17, 2006 The restrictor is there to decrease the oil pressure to the turbo, so that you don't blow oil out past the seals. Restricting the return line would not be a good idea. You should be fine without one. Just run a -3 (preferably teflon) feed line - that should be restriction enough. Quote Link to comment Share on other sites More sharing options...
naviathan Posted October 17, 2006 Share Posted October 17, 2006 Hmm, odd I always heard it was to increase pressure and hold a little oil in there when shutdown. Oh well, go with the turbo pros, I'm better with NA applications. Quote Link to comment Share on other sites More sharing options...
nismopu Posted October 17, 2006 Author Share Posted October 17, 2006 thanks guys! A local turbo builder told me I should probly do this with an older baseline garrett. I guess the seals arent as up to the task as some of the newer versions? Anyway, little bits here and there getting me closer everyday. peace. Quote Link to comment Share on other sites More sharing options...
nienberg.11 Posted October 17, 2006 Share Posted October 17, 2006 It won't hurt anything to give it a try without a restrictor in the oil SEND line. Like Tim said, you absolutely don't want to restrict the oil return, unless you enjoy huge clouds of oil smoke. I ran my t3/t4 with no rectrictor and it was fine for ~2000 miles, then started to smoke a bit. I added in a restrictor and it's working perfectly again. Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted October 18, 2006 Share Posted October 18, 2006 I know this is a good idea for the garret turbo, I found this out the hard way by blowing oil out the seals. But what if I were to be using it on a diffrent turbo. Such as a holset H1e, would that need a restrictor since it is a bit bigger then the T3? Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted October 18, 2006 Share Posted October 18, 2006 Definitely run a restrictor, unless you like the smell of burning oil. You can also just weld the end of a steel AN adapter in the feed line and drill a very small hole through the weld. I cant remember the drill bit size I used but it was around 0.06" IIRC. You really dont need (or want) a lot of flow into the turbo. The drain can be as large as you want, but there's no point making it larger than 3/8". It's gravity fed and should not be restricted. - Greg - Quote Link to comment Share on other sites More sharing options...
lucky Posted October 18, 2006 Share Posted October 18, 2006 As Tim said earlier, if you run a -3AN feed line then there is no need for a restrictor, as the smaller line is restriction enough. That's what I did on the second turbo setup with a T3/T04E and it worked like a champ. Quote Link to comment Share on other sites More sharing options...
skillet Posted October 18, 2006 Share Posted October 18, 2006 i have a GT3071R and a -4 feed line on my SR. have been boosting hard for over a year without a restrictor and the turbo is still clean. i have heard horror stories of people ruining very expensive turbos though. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted December 29, 2006 Share Posted December 29, 2006 I am currently running a T3/TO4 turbo on my 77 280Z and I just took the intercooler line off of the turbo and it has oil in it! Also I am getting oil around the outside of the compressor housing. I checked the oil inlet and outlet for a leak but they are both clean. So it looks like I may need to restrict the oil flow? I am running a 3AN braided steel feed line so apparently I am still getting to much oil to the turbo. Oh yea the turbo was reworked and checked by Garrett less then a year ago so it should still be good to go. I also look at my drill bit set and a #52 bit is 0.0635, this should work. Now I just need to plug the fitting and drill it out. So I will be off to the hardware store for a set screw of the correct size to plug my housing fitting. Then drill it out. Now with this restrictor installed will I have to be even more careful about letting the turbo spin down before shutting off the car? What do you all think? HB280ZT Quote Link to comment Share on other sites More sharing options...
TimZ Posted December 29, 2006 Share Posted December 29, 2006 How have you plumbed the PCV lines? Your problem could also be blow-by from the engine. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted December 29, 2006 Share Posted December 29, 2006 My PCV is set up in the factor location, i.e. the tube running from the front of the motor to the bottom of the intake manifold. I also have the valve cover vent running into the intake pipe right before the turbo, I have checked this hose and it is clean of all oil. So what now? I did look at the oil feed line to my turbo and it has a diameter of .120 with a 3AN feed line. So I just made a restrictor that changes the diameter to .070. We will see if this changes anything. Also I found that I need a new oil pump so a new one is now on order. Thanks HB280ZT Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted May 5, 2007 Share Posted May 5, 2007 anyone using a restrictor on a Holset turbo?! im having some weird problems with oil blowing out of the seal, I tried a new PCV setup without much luck. Im still running stock lines, I kinda want to just "bend" it and reduce the flow. But that would be the wrong way to do it lol Quote Link to comment Share on other sites More sharing options...
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