I would imagine that the VNT would still allow for quicker response when compared with a traditional wastegate turbo.
My original thought of simply increasing the A/R I imagine would solve some of these "issues".
Last edited:
The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread (10 Viewers)
- Thread starter ForealBoreal
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
My original thought of simply increasing the A/R I imagine would solve some of these "issues".
I'm not against vnt and I'm not saying Gturbos development is a waste of time. Far from it, Any RnD like this will only leed to better product for us. Its just expensive and time consuming to DIY .
You can just increase the a/r at the expense of response. They are a compromise as is a wastegate turbo . I was just trying to make you aware that they aren't a "magical cure"
You can just increase the a/r at the expense of response. They are a compromise as is a wastegate turbo . I was just trying to make you aware that they aren't a "magical cure"
Simply is not the language to use. R and D is expensive trial and error testing. Be very tuff to find different sized housings for the same VNT frame. Aftermarket support for VNT turbos is non existent for a reason. They are rarely retrofitted. Even more rare is a successful retrofit.
VNT requires a highly engineered setup. If you can find a suitable sized OEM setup then bingo. Look no further. Landrover guys do this with the GT2256V because it's availble on a whole slew of OEM fitments around the same size. Including one which used a pressure actuator!
If anyone finds an OEM VNT setup for a 4.2L diesel with good power then let me know. Only ones I am aware of are using a pair of VNT's on a V8.
But the VNT is more tempermental and has less power potential. It's a big compromise.
The no compromise solution is compound wastegated turbos. But see the opening line above about "requires a highly engineered setup"? Double that.
If anyone finds an OEM VNT setup for a 4.2L diesel with good power then let me know. Only ones I am aware of are using a pair of VNT's on a V8.
But the VNT is more tempermental and has less power potential. It's a big compromise.
The no compromise solution is compound wastegated turbos. But see the opening line above about "requires a highly engineered setup"? Double that.
Bingo.
mudgudgeon
Resident galah
why would someone like Gturbo bother with developing VNT then? Sounds highly problematic, particularly if you don't have control of the install process.
What is the upside of VNT in a performance scenario?
Because not everyone wants big power and Gturbo have the engineering brains to make it work.
mudgudgeon
Resident galah
be interesting to see what comes of it.
I'm thinking the market for it would be pretty small. If purchase and set up cost comes in the same as his current offerings, I could see there being more interest.
Could a VNT type of turbo even be used on a mechanicaly controlled diesel like a 1HDT or would you need a modern common rail digital engine to have enough controls?
I think IanB nailed it K.I.S.S.
I finally have my Mamba TD05 - 18g installed on my freshened up engine (1HDT). Yotahead did my pump and injectors add a homebrewed intercooler and the results are amazing. Only running 18psi until my aircleaner is done then 24psi. Simple....kind of. If you ask my wife....stupid for sure. Not sure if she means me or the truck. With a little work we can improve the performance of our trucks without getting too complicated. Why did I build two outlets off of the intercooler....hmmm. So much for simple.
Cheers gentlemen.
I think IanB nailed it K.I.S.S.
I finally have my Mamba TD05 - 18g installed on my freshened up engine (1HDT). Yotahead did my pump and injectors add a homebrewed intercooler and the results are amazing. Only running 18psi until my aircleaner is done then 24psi. Simple....kind of. If you ask my wife....stupid for sure. Not sure if she means me or the truck. With a little work we can improve the performance of our trucks without getting too complicated. Why did I build two outlets off of the intercooler....hmmm. So much for simple.
Cheers gentlemen.
mudgudgeon
Resident galah
she could be right, which is why its best not to ask. 
mudgudgeon
Resident galah
@Wildnlost I like your intercooler/intake manifold set up. More complex than a single entry, sure. But you've also come up with quite a simple improvement!
Will even flow out amongst the cylinders more for sure. See if you can put a fan on it and a thermo switch or hobbs to actuate it. Will increase its efficiency by a large margin. Nice work.
It is a work in progress. Coming along slowly. Few things to. Using a large scoop too.
They must have a power or torque figure in mind that they want over a particular rev range in which a vnt would be suited to .
If you want pure performance and have a good turbo guy always go for compounds . if I had the room it would be a no brainer
A simple twin scroll setup would have great benefits on a low revving deisel without any drawbacks except a new manifold wouldn't it?
I would think this would be simpler and easier than a vnt option.
Says me still running the stock turbo LOL
I would think this would be simpler and easier than a vnt option.
Says me still running the stock turbo LOL
mudgudgeon
Resident galah
@gerg seems to be getting good results from a twin scroll. Definitely sounds like something worth pursuing.
Yeah, it's something that takes you away from a ct26 platform and into custom manifold territory.
Maybe there'd be some demand for a quality cast iron manifold designed for a more common turbo platform
Yeah, it's something that takes you away from a ct26 platform and into custom manifold territory.
Maybe there'd be some demand for a quality cast iron manifold designed for a more common turbo platform
Before I bought a stock manifold to replace my cracked one I searched quite a bit and couldn.t find anything . The Mitsu TD42 guys have a few options.
A cast hiflow manifold would be nice for the 1HDT. The stocker has got to have restrictions to flow.
A cast hiflow manifold would be nice for the 1HDT. The stocker has got to have restrictions to flow.
mudgudgeon
Resident galah
Yep, if you can't do all the above yourself, it adds to the cost and complexity.
if there were bolt in manifold options, it would be easier to branch away from ct26 platform.
is there any downside to having a standard single entry turbo mated to a split pulse manifold?
if there were bolt in manifold options, it would be easier to branch away from ct26 platform.
is there any downside to having a standard single entry turbo mated to a split pulse manifold?
