~My 91 GLI to 1.6TD conversion build up~ - page 24 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• #345 by Rabbit on Roids on 06 Mar, 2009 22:25
• i wanna run about 20 - 25 psi and have enough fuel to go with it. but is a VNT 17 any good for use as a small turbo in a compound setup?
• #346 by 53 willys on 07 Mar, 2009 06:57
• all right at this point I think i'm gonna go with the BB turbo..
  I really dont want to mess with compounds right now  and I like the idea of getting a brand new turbo built to my specs VS a off the shelf gasser turbo...or a KKK series turbos...I know lots of guys like the KKK's but mine blew up and Zukgod1 blew up 2 so far...they dont seem to hold together very well IMHO..but some of the blown turbos could have been self inflicted damage?
  maybe in a year or so I can upgrade my BB unit and put a k14 on top of it or something...but for now I am conforming to the classic big single turbo..but this time it will spool LOTS sooner...and have a WAAAAY more usable range compared to my hybrid K26
   :lol:
  
  
  thanks for the help guys....
  if anybody wants to try and talk me in a different route lets here it!!!
  I'm not ordering my turbo and external wastegate until Monday....
  so if you got something to say do it now before I order up!!
  i'm open to suggestions!!
• #347 by Rabbit on Roids on 07 Mar, 2009 08:50
• i actually wanna see how it works for you. cause i know that i need some sort of different turbo. i like that mine spools instantly, but im pretty sure its restrictive. i dont know how it couldnt be, the hole in the exhaust housing is like 1.45 inches. and that doesnt seem like enough flow.
• #348 by UnderPSI on 07 Mar, 2009 10:37
• Compound turbo's on a diesel are far superior to a single. The torgue curve is generally a flat line. Singles don't compare. And what's the diff from gas to diesel turbo? A turbo has no idea what motor it's on.
  
  I would sell the VNT and get standard turbos. For a 1.6, a GT12 for the high pressuer and a GT15 for the low pressure would give you up to 250hp.
• #349 by Rabbit on Roids on 07 Mar, 2009 11:20
• 250 horses would be sweet.. no question. but im sure im never gonna build that kinda power with my IDI. 1.5's are probably pretty limited on the power numbers they run? and i know they dont build near the torque the 1.6/1.9's do, but i like the top end power. eventually i wanna throw together a 1.5/MF/AAZ engine. MF turbo block, 1.5 rotating assy, AAZ head w/ studs and a metal gasket. and probably some extensive porting.
• #350 by UnderPSI on 07 Mar, 2009 11:31
• I have a 1.5 in my Samurai, I like how it revs. I have a little KO3 going on it next week. Then I going to compound that with a S1B Schwitzer when time allows.
• #351 by 53 willys on 07 Mar, 2009 11:44
• Quote from: "UnderPSI"

  Compound turbo's on a diesel are far superior to a single. The torgue curve is generally a flat line. Singles don't compare. And what's the diff from gas to diesel turbo? A turbo has no idea what motor it's on.
  
  I would sell the VNT and get standard turbos. For a 1.6, a GT12 for the high pressuer and a GT15 for the low pressure would give you up to 250hp.

  
  You are right 100% that compound turbos are king on diesels...but they still make lots of low end boost..and I would have to/want to build them with a K14 and a K26..but when I look at spending the same money or dang close for the two KKK turbos to rebuilt..then materials to build a manifold and drains and all the other details for compounds I loose interest..I have been working on his car for 6 months now...I ready to get some drive time before I tear it back down.
  
  plus this is a good way to get a real good big bottom turbo..then maybe stack a K14 on top of it in a year or so.
  
  the gasser turbos are set-up to build boost at MUCH MUCH higher RPM's vs a Diesel speced turbo..
  
  you dont need to convince me that compounded turbos kick ass on diesel......I know they do and will walk all over a single turbo..
  I'm more thinking custom compounds...dual BB as my next upgrade :twisted:  :twisted:  :twisted: and getting this BB now is a good start
  
  two BB compounded turbos and a ED external wastegate would be A SMOKING HOT SET UP!!! :twisted:
• #352 by UnderPSI on 07 Mar, 2009 12:08
• Manifold and drains are easy. Are you saying you're too lazy and want to drive your project instead of work on it...?  :lol:
• #353 by 53 willys on 07 Mar, 2009 12:21
• Quote from: "UnderPSI"

  Manifold and drains are easy. Are you saying you're too lazy and want to drive your project instead of work on it...?  :lol:

  
  YES.... :lol:
  I need at least 6 months of enjoyment before I tear back into it!!
  they it will be another $1500 for a BB top turbo! :twisted:  then will you be happy? :lol:  can you give me 6 month???
• #354 by jtanguay on 07 Mar, 2009 13:10
• Quote from: "UnderPSI"

  Compound turbo's on a diesel are far superior to a single. The torgue curve is generally a flat line. Singles don't compare. And what's the diff from gas to diesel turbo? A turbo has no idea what motor it's on.
  
  I would sell the VNT and get standard turbos. For a 1.6, a GT12 for the high pressuer and a GT15 for the low pressure would give you up to 250hp.

  
  
  i would wager that a VNT could compete with compound turbo's.  unless of course the compounds were VNT...  :lol:
  
  the reason being is that the exhaust gases are actually directed to the turbine wheel by the variable vanes.  ball bearing VNT would be insane!!
  
  and as far as superiority vs single, of the same type, yes.  BUT reliable?  not quite so.  you should really talk to andy2 on the problems he faced when going this route.  it isn't as easy as plumbing everything up and it works perfectly...  one problem in particular is the oil pressure loss.
• #355 by UnderPSI on 07 Mar, 2009 14:04
• Compound VNT's would be a great project, would like to see that as well. I have a 1.5 with a 1.6 hydraulic oil pump, hoping this will take care of oil pressure issues I may have. A turbo doesn't need a ton of oil, you can restrict it at the turbo.
  
  I haven't ran compounds on a VW, however on bigger setups like a 12 valve Cummins, compounds have proved quite relliable.
• #356 by UnderPSI on 07 Mar, 2009 14:07
• Quote from: "53 willys"

  
  YES.... :lol:
  I need at least 6 months of enjoyment before I tear back into it!!
  they it will be another $1500 for a BB top turbo! :twisted:  then will you be happy? :lol:  can you give me 6 month???

  
  
  I'll give you 6 months, but after that, I'm gonna park my 1.5 compound turbo Samurai on the top of your car till it's done.... strictly for motivation of course....
• #357 by 53 willys on 10 Mar, 2009 10:24
• ok I bit the hardcore bullet and bought the Turbonetics Ceramic BB turbo and Engineered diesel External wastegate and t3 exhaust manifold.......
  Here we go again!! :twisted:
  part should be coming in this week
• #358 by zukgod1 on 10 Mar, 2009 10:27
• Holly hell man!!!
  
  For some reason I feel like I should come by and beg for forgiveness from your wife!!!!
  
  I'm really looking forward to you getting this turbo..
• #359 by foxracer1 on 10 Mar, 2009 11:33
• Keep us posted and post up lost of pics!!