mudgudgeon
Resident galah
Also known as a "small ct26", for further confusion.
The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread (5 Viewers)
- Thread starter ForealBoreal
- Start date
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Also known as a "small ct26", for further confusion.
Yes the CT20B is also used on some MR2's and I think on the twin turbo Supra. It is a lot bigger than the CT20 from a 2LT.
I think the economy drop was due to compressor efficiency loss. The bigger compressor was in a bad place on the map (it didn't have enough surge resistance) at cruise and at lower rpm. I wasn't able to measure drive pressure because I misplaced my gauge and brackets. I've found them all since. But I guarantee drive pressure would be higher.
The larger turbo though was a hoot to drive when over 2000rpm. 4th gear passing was addictive and in 5th once the rpm was up it kept pulling. It wasn't ludicrous power, it felt good the way it spooled but was just ~500rpm later than I like. Current plans are afoot to do much better. But life keeps getting in the way.
Nice! What turbo are you running on that?
About 101.3kPa of weighty atmosphere. They're pretty shaky at the top speed of ~24km/h. Got three of them here including one my old Grandfather bought new.
GTSSportCoupe
2LTE abuser
Hey All,
Just to clear something up here. The 'CT20B' is more a cross of the CT26(compressor)/CT20(turbine) then anything. Here are some Toyota wheel size specs (mm). I'll add more to the list as I can.
Turbo - Compressor(ind/exd) - Turbine(ind/exd)
(engine)
CT26 - 40/65, 65/52
(3SGTE ST165 Celica, single entry)
CT26 - 41/65, 65/52
(3SGTE SW21 MR2, ST185 Celica, twin entry)
CT26 - 43/65, 65/52
(1HDT Landcruiser, single entry)
CT26 - 47/65, 65/52
(7MGTE Supra, single entry, large A/R turbine housing)
CT20 - 36.1/57, 60/48
(2LT, 22RTE Hilux)
CT20A - 39.6/57, 60/44
(2LT-II, 2LTE Hilux, Prado)
CT20A ceramic - 37/62, 60/48
(2JZGTE JDM Supra, Aristo)
CT20B ceramic - 46/65, 60/50
(3SGTE late SW21 MR2, ST205 Celica, twin entry)
CT26 small - 46/65, 60/48
(1HDFTE Landcruiser)
CT15B - 46/65, 60/48
(1JZGTE VVTI Soarer)
CT12A ceramic - 35/54, 51.6/42
(1JZGTE Soarer)
CT12B - 39/58, 52/44
(2JZGTE USDM Supra)
CT12B - 43.1/58, 52/44
(1KZTE Hilux, Prado)
CT9 - 34/48.1, 46/36
(4EFTE Starlet)
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So in a nutshell, TD05H aside...
Correct me if I am wrong, Im trying to generalize all the info here....
?- A Stock CT20B with a 17020 Turbine housing alone (essentially a 1HDFTE turbo) is a large upgrade. Smaller turbine wheel and larger compressor wheel.
?even better, A CT20B core machined to fit a a 16G or 18G wheel, 17020 turbine housing and an Antisurge Compressor housing.
Option 2 is basically the $1000usd option from Sumalaya mentioned previously. This could be pieced together with a used 3SGTE turbo, a Melett rebuild kit and 360 thrust bearing upgrade, a little machining of the CHRA, a 17020 and the compressor housing and 16G wheel that foreal was selling previously?
These seem like easily doable options without machining to make the TD05H work.
Correct me if I am wrong, Im trying to generalize all the info here....
?- A Stock CT20B with a 17020 Turbine housing alone (essentially a 1HDFTE turbo) is a large upgrade. Smaller turbine wheel and larger compressor wheel.
?even better, A CT20B core machined to fit a a 16G or 18G wheel, 17020 turbine housing and an Antisurge Compressor housing.
Option 2 is basically the $1000usd option from Sumalaya mentioned previously. This could be pieced together with a used 3SGTE turbo, a Melett rebuild kit and 360 thrust bearing upgrade, a little machining of the CHRA, a 17020 and the compressor housing and 16G wheel that foreal was selling previously?
These seem like easily doable options without machining to make the TD05H work.
The problem is, if its not exactly what you like its very difficult if not mpossible to change out turbine housings for just slightly smaller or larger to fine tune it. With a td05 its literally like lego and all the info is out there, you can choose multiple suppliers for almost every component. Makes tuning infinitely easier. . I personally feel you guys will shell out a big chunk of change for a toyota turbo and get stuck with it. Better get it right the first time. Very tuff to get it right the first time by the way.
As far as lego goes, with the TD05, you still require a Toyota CHRA compatible Turbine housing though no? Or are you suggesting an completely different core all together.
Im not positive, but the older Gturbos look like toyota cores/bolt on turbine housings with unknown turbine/compressor wheels, with antisurge housings like the ones Foreal was selling.
mudgudgeon
Resident galah
There's the trap. And the hesitation in going for something like the sumalaya.
The trade off is bolt in, un-proven, inflexible vs custom manifold or adapter, modular, flexible, proven parts.
Or, pay big bucks for g-turbo. For me, not going to happen any time soon.
I would prefer a one off install, not really keen on repeated mix and match. The hard part is comparing unknown combinations.
That gives you a compressor similar flow to the supra wheel with a much faster spooling turbine. So yes it's the best bolt on solution.
However. Aftermarket turbos vary hugely in quality. The difference between a good turbine wheel and a crap turbine wheel is about 20% in turbine efficiency, big difference in spool, boost, drive pressure and top end power.
Google shows heaps.
Sorry i cant find anything complete and im not exactly a turbo wiz
Sent from my SM-G900I
Sent from my SM-G900I
Sorry mate. One more question, will i need an adapter for it or will it bolt to the 12ht exhaust manifold? Again cheers for being patient
Sent from my SM-G900I
Sent from my SM-G900I
Should bolt up. But I can't confirm that. Looks like the compressor side will need adaptors.
mudgudgeon
Resident galah
Only "known" seller that came up is asking ~$2300aud for an oem turbo which puts you in the realm of gturbo pricing.
Or back to unknown ebay type stuff
Yep my BBX with FTE core in housing to suit 1HDT was only a couple hundred more...
How does someone endowed with a wealth of turbo knowledge not recognize the MASSIVE, GAPING hole in the aftermarket turbo market for these trucks? Surely, someone can see the potential...
Sent from my SM-G920V
Sent from my SM-G920V
