buddabeast Posted February 1, 2012 Share Posted February 1, 2012 Hello. I want to source the right turbo for my LD28, I think a T3/T04E might be a bit extreme for this low-mid boost application. I would look to run 5-10psi atleast for a start. It's a low RPM beast so maybe a <0.5 A/R turbine housing would suit?? What do the L20et's use as their stock turbo? Or RBdet's for that matter? Any help would be appreciated. I also fail to understand how a T3/T4 hybrid can be so powerful but a basic T3 or T4 not so much? Thanks. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted February 1, 2012 Share Posted February 1, 2012 Question 1. Is it Auto? If so, slap on some big fucker. Lag is much less of an issue when it's an auto. Something off a truck would be good. If it's manual you'd want something that spools up faster. Question 2. This is not a question. 5-10psi can piss off. Run 20. If you wanna get fancy you could do what I'm doing and get a variable geometry turbo. Diesels love these things. They are a bit more complex due to the vane control system, but it's all part of the fun. What is your level of turbo diesel knowledge btw? Quote Link to comment Share on other sites More sharing options...
buddabeast Posted February 1, 2012 Author Share Posted February 1, 2012 It's a manual - can you recommend a fast spooler? My diesel turbo knowledge ain't the best.. but I'll learn something with this project. A variable geometry turb sounds like multiple turbos in one? 20psi could be done but I wouldn't go past 14. Would a T3/T4 do the trick? Quote Link to comment Share on other sites More sharing options...
Simon Posted February 1, 2012 Share Posted February 1, 2012 Answer = A big one. Find out a compression ratio for us and in tern a PSI spec... Then if you run say 5-7 psi over standard it's ok... Add an IC and you could pull 15. Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted February 1, 2012 Share Posted February 1, 2012 Can you make the standard fuel supply run harder to compensate for the turbo? Have an ld28 that I have been considering turboing my self Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 1, 2012 Share Posted February 1, 2012 my ld28 had a t3 on it.spooled up fairly quick,and sat on 7psi. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 1, 2012 Share Posted February 1, 2012 Can you make the standard fuel supply run harder to compensate for the turbo?Have an ld28 that I have been considering turboing my self jsut tweak the fuel screw on the pump. piece of piss. don't be afraid of boost. over 15psi you'll want and intercooler to help keep the egts down, though. l20et manifolds accept t3 flange do they not? jsut roll a t3 to start. should be nice and cheap? Quote Link to comment Share on other sites More sharing options...
buddabeast Posted February 2, 2012 Author Share Posted February 2, 2012 I'm sure the compression ratio is 22:1. Yeah L20et have the T3 flange I'm sure so I'll get one of them to start with, just a matter of finding one. Thanks for the help. What does EGTs stand for? something to do with heat/stresses? Quote Link to comment Share on other sites More sharing options...
UTERUS Posted February 2, 2012 Share Posted February 2, 2012 Exhaust Gas Temperature. http://www.trademe.co.nz/motors/car-par ... 951413.htm Tuning a diesel isn't too difficult really, set the boost to whatever you feel won't melt the turbo, then wind up the fuel till it hovers around 600 degrees at full load up a long hill. If you're not towing you can usually go a bit higher with the fuel, but 600 seems to be a pretty agreed number to be safe and not melt things. A decent intercooler will help immensly with keeping egt's down. Quote Link to comment Share on other sites More sharing options...
buddabeast Posted February 2, 2012 Author Share Posted February 2, 2012 Ah right good advice. 600 deg C wow that's hot. I live in Napier at the moment too been here 9 months, but leaving this week though. Cheers Quote Link to comment Share on other sites More sharing options...
kpr Posted February 2, 2012 Share Posted February 2, 2012 agree with standard t3, not t3/t4. prob dont want to go too big on the exhaust side either. .48 max i would think. we run a ht18 with the massive twin scroll exhaust housing on our td42, ended up welding up the wastegate and running truck style. free boosts up to about 17psi. wont go any higher as doesnt have the exhaust gasses to. few dudes we know are running chinese "t3/t4" with similar results. so would be too big for ld28 Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 2, 2012 Share Posted February 2, 2012 make a custom manifold...that way the heat is even across the cylinders.. the manifold i had was rear flanged,so the #6 was alot hotter,so i only ran 7psi.. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 2, 2012 Share Posted February 2, 2012 ended up welding up the wastegate and running truck style. this is a good idea IMO. means you always run max boost that the amount of fuel will let it produce. long as you can get a turbo that'll stay together guys with td27 terannos and shit seem to jam wastegate shut and get around 30-35psi but yeah. lots of people around the world play with this engine. read READ READ! as much as you can before you do anything. I would like to fettle with an ld28T someday. Quote Link to comment Share on other sites More sharing options...
kpr Posted February 2, 2012 Share Posted February 2, 2012 yeh seems to work pretty sweet. if going to build a manifold. i'd run something like a td04l off a wrx, cheap & easy to find. bit newer tech and should match engine fairly well. Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 2, 2012 Share Posted February 2, 2012 theres a ld28 forum ae...i think its nissandiesel.com or something Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 2, 2012 Share Posted February 2, 2012 heres just for you kid.. and anyone else,lol http://nissandiesel.dyndns.org/index.ph ... 0890860c92 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted February 2, 2012 Share Posted February 2, 2012 PLan B. Fit a dirty old eaton M90. With diseasels running no throttle body, the pump would continually supply whatever boost your choice of pulleys denote. So as you apply the right foot, you'll have all the torque you could ever need on demand. (with zero lag) TBH, I'm still getting my head around how diseasels actually work. But I prefer supers to turbos any day. Quote Link to comment Share on other sites More sharing options...
kpr Posted February 2, 2012 Share Posted February 2, 2012 turbo far more efficient tho. lag isnt much of an issue if using the right turbo. diesel will create boost on overrun, so spool time when you get back on the gas, isnt bad at all Quote Link to comment Share on other sites More sharing options...
buddabeast Posted February 2, 2012 Author Share Posted February 2, 2012 There's no throttle body pritty sure so fuel will do what it needs to? I can't adjust the fuel pump anyway can't see how/. Oh yea nissandiesel forum cheers forgot that one. But oldschool.co.nz is always the first resort. T3 turb sounds good. I'll get one of those - external if I can. Quote Link to comment Share on other sites More sharing options...
buddabeast Posted February 2, 2012 Author Share Posted February 2, 2012 I see a Td04 on trademe but T25-T4 range is plan for my nissan I think Quote Link to comment Share on other sites More sharing options...
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