The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread

[Locked79]

Hi.
I would have an opportunity to buy one of those Mamba CT26 upgrade turbos. It is used (only 1k km) and already shipped/taxed to Finland.
Asking price is about 300USD.
This is the exact same unit: MAMBA Bolt-On GTX TOYOTA 12HT 12H-T HJ61 Land Cruiser CT26 GT3071R Turbocharger | eBay
How well would this one work with the mighty 12H-T? Or should i stick to 7M CT26?

3071 is way too big. 2860 is a good size for good low end response, 2871/2876 will be a bit laggy down low but perform better in the higher rev range.

Stick to the 7m ct26 hybrid or a ct12b from a 1hd-fte.

Anything with the garrett 60-1 wheel is too big.

 

[HoJo 61]

3071 is way too big. 2860 is a good size for good low end response, 2871/2876 will be a bit laggy down low but perform better in the higher rev range.

Stick to the 7m ct26 hybrid or a ct12b from a 1hd-fte.

Anything with the garrett 60-1 wheel is too big.

I was about to pull the trigger but i thought it's better to make sure i'm not going to buy something that wouldn't work, thanks @Locked79

 

[gerg]

You'd be surprised what you can find to buy on the web that is totally inappropriate for your engine. Many sellers have less than no clue about the accuracy of the products they sell or the correct application.

 

[Rob1983]

I've been working with the builder who made my previous GTX3071, he's developed a prototype hi-flow CT26 based on the information I've been able to provide him on the gturbo's performance. This is just the first stage, safe to 40 psi (same as gturbo), but expecting better flow and possibly slightly improved response due to better quality componentry. Here's some pr0n for you all. Should have it in my hands end of this week/early next week (as usual waiting on freight), but I probably won't get a weekend free for dyno and spanner time until nearer Xmas unfortunately. If this performs as expected, retail price will be about half that of gturbo. Next stage is the giant killer, safe to 40+psi and better again, but still working on testing and development for this. Will post dyno sheets of both this and the gturbo, and further info on the next level as it gets closer to fruition

 

[ForealBoreal]

Any details on what wheels you are using?

 

[Rob1983]

Any details on what wheels you are using?

Similar turbine, upgraded compressor, slightly larger, with extended tip technology. Better core and upgraded thrust bearings

 

[Dougal]

Inducer looks pretty big. Expecting surge?

 

[Rob1983]

Inducer looks pretty big. Expecting surge?

No more than the gturbo lol

 

[ForealBoreal]

The one he posted definitely had some surge.
I'm curious on the turbine selected and what was in for the gturbo. The other the turbine is a TD05H.

 

[Rob1983]

haha gturbo sounds like it has a blow off valve on it when you back off at full noise I'll email you some more pics when it shows up @ForealBoreal

 

[ForealBoreal]

yeah curious about the combo you are running. Far out of perspective for the turbo goals I have.
I'm going to be swapping to one of my turbos at some point here.

 

[Tapage]

no ball bearing option / plans .?

 

[Dougal]

I think above 30psi you're better with compounds. The compromises get quite severe and trying to fit the air-flow requirements onto a single stage compressor map becomes ridiculous. Not to mention turbine.

 

[Rob1983]

I think above 30psi you're better with compounds. The compromises get quite severe and trying to fit the air-flow requirements onto a single stage compressor map becomes ridiculous. Not to mention turbine.

That's the next step

 

[Rob1983]

I think above 30psi you're better with compounds. The compromises get quite severe and trying to fit the air-flow requirements onto a single stage compressor map becomes ridiculous. Not to mention turbine.

I'm just seeing how far I can push a single stage setup first

 

[serenity]

So my boost pressure when accelerating continually rises to about 9 psi then snaps back to 5 psi, can't get it above 9 even putting the boot in up a hill.
I've currently got my wastegate actuator set to around the 15-16psi mark.

Is this symptoms of a boost leak? Or something else?

 

[mudgudgeon]

What hoses do you have from air box to compressor housing?
Is it possible they are collapsing due to vacuum created as turbo spools up?

 

[serenity]

What hoses do you have from air box to compressor housing?
Is it possible they are collapsing due to vacuum created as turbo spools up?

I'm running all factory hoses between the airbox and turbo, I would think that if they were collapsing it would give consistently low boost not climbing to 9 then snapping back to 5 psi.

I can hear the turbo shaft speed slowing though when it drops back.

 

[mudgudgeon]

Factory 1hd-t hoses? The factory hoses have a steel sleeve at the join to prevent collapsing.

Many 1hz turbo projects suffer from hoses collapsing and choking the engine.
I wouldn't expect it to happen at low boost. More at high-ish rpm, high boost when you have a lot of air moving through the intake.

 

[serenity]

Factory 1hd-t hoses? The factory hoses have a steel sleeve at the join to prevent collapsing.

Many 1hz turbo projects suffer from hoses collapsing and choking the engine.
I wouldn't expect it to happen at low boost. More at high-ish rpm, high boost when you have a lot of air moving through the intake.

Yeah I bought a complete 1hd-t setup from airbox to dump pipe, steel sleeve is in there. Not running anywhere near high rpm or high boost which is why I can't figure it out.