very keen to hear results :D i would asume if your planning on running more than 15psi the super ct would be the better option....
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very keen to hear results :D i would asume if your planning on running more than 15psi the super ct would be the better option....
why would you run any less:D
Quote:
Originally Posted by Vern
I don't know any details for the CT26, but a properly sized VNT should be better than a fixed geometry single turbo.Quote:
Originally Posted by c.h.i.e.f
Trouble is Garrett have only released small frame (>GT22) and much larger frame VNT turbos, and nothing in between.
A GT2259V should be ok with a 4BD1T and moderate pump adjustment for 200+ HP. They will be ok for 25psi or a little more.
The biggest problem with VNT's are shaft failures. I don't know what the history of the larger units (60mm compressors) are, but the smaller turbos (49mm) break shafts often with factory boost levels (18psi for the applications I'm thinking of). The failure point being the necked down centre on the "slender shaft" versions. "Straight shaft" upgrades are available for some VNT turbo sizes.
How is that BW turbo going John?
well i have 3x 2260's to play with:)
I knew the high performance vw tdi were breaking spindles with their gt17 series vnt, which they attributed to surge issues (why the special dawes valve came about to help solve).Quote:
Originally Posted by Dougal
I hadn't heard of issues with the gt2256V in other applications, but that may be more to do with the limits of my interests.
AFAIK the T25 overhaul kits also suit the gt2256V, but from memory the 17 spindles are smaller.
Which Borgwarner turbo - S200 or K16/K27.2 ? I put the S200 on until I get rego'd - since a turbo is not stock for Land Rovers (I could argue about the 6x6 perentie!!), but compounds might be asking for problems.
I picked the S200 with 0.5 A/R turbine housing from bullseye because I wanted enough air for my IP settings.
The 76mm extended tip compressor impeller in the S200 has a very broad map and I don't think it will surge provided I don't let the engine lug and accelerate it quickly. It has great efficiency numbers for the airflow and pressure required for 300+ HP with the 4BD1T.
I have much to do before I can get back onto the landie and test it out though.
Nissan had a lot of problems with their GT1849V turbos on 2.2 diesels in europe and renault also. The nissan problems were cured by revision 5 but I don't know what changed internally. Turbo Technics and others rebuild these turbos with a straight shaft for quite a good price (if you are earning UK pounds).
These turbos ran around 18psi standard and last about 100,000km if driven sedately. The nissan YD25 engine used in some japanese people movers run a similar turbo and I have one from a friend which died at 120,000km. I have the same vehicle here with 115,000km on it.:( I know these vans don't suffer compressor surge, but any surge would certainly hasten failure.
I'm quite interested in how your S200 runs. While VNT and compounds will offer the best performance I still think there's a good place for a solid wastegated turbo that is built to deliver high boost. Your S200 and the Super CT26 are the main contenders there.
Last winter I swapped out the tiny T25 for a T25/T28 hybrid (basically a T25 with 0.64 A/R exhaust housing and a 60mm compressor wheel). To be honest I don't like it. I really miss the low end punch and smoke free spoolup of the little T25. I have a GT2256V here which I need to fit at some stage.
is a CT26 a toyota made turbo? whats an s200 guys?
also a tad of topic but see how most of these turbos we are discussing are journel or "bush" bearing turbos what are your thoughts on all these mods you hear in magazines etc etc about Ball bearing turbos are they that much better or is it a load of .... ? from what i can gather is they allow slightly faster spool up (say a gt28 bb turbo having same spool up time as a gt25 bush turbo)
CT26 is a range of turbos Toyota use. I think they are made by garrett for Toyota, different variants are used on everything from supra's to diesel landcruisers. The "Super CT26" is a turbo an engineer in Perth has conjured together using CT26 parts for the Toyota 12HT (4 litres) and 1HD series (4.2 litres). They're too similar in size to our engines to ignore.
Likewise the S200 is a range of turbos by Borg Warner. Bush65 has researched and ordered a specific model for his 4BD1T. I think these two turbos are currently the best options for high boost wastegated models, so we eagerly await the results from both.
IMO ball bearing turbos aren't the best choice for high boost applications (above 20psi). Lag is really a petrol ricer thing, our diesels are almost always on boost and the boost threshold matters more.
thanks for that ... why i asked was because i did see the ct26 mentioned in relation to supras. it will be interesting to see what the final results are from these turbos :) i just thoguht i would ask about the bb turbos as i cannot see how they are really that special.
i was talking to an engineer from SKF during a bearing course and i mentioned about what would be best suited to high rpm situations a journel bearing turbo or a bb turbo and his answer was if correct oil and maintenance was used on a journel bearing turbo technically it should "almost" never wear out (within reason of course) and will not have the failures like that of a bb turbo.
the 12ht is direct injected isnt it?