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incorrect remmy. Actually the 1hdfte housing is the smallest.
The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread (4 Viewers)
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mudgudgeon
Resident galah
Negative.
Have a look at page 50. I took a modeling clay mould of each to compare and measure them. 1HD-FTE turbine housing is a lot smaller A/R
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If I'm going the Supra Hybrid way - what can I expect from the turbo if I go with a Melett CHRA ( Supra 7mgte ) and a Toyota housing and the smaller 7cm turbinehousing ?
Where will my boost start ? Or is that hard to tell ?
Where will my boost start ? Or is that hard to tell ?
mudgudgeon
Resident galah
It's a little hard to tell, there's a few variables such as exhaust, air intake, tuning. More fuel will help it boost earlier, but there's limits.
My supra hybrid with stock 1HD-T rear housing (8cm), 7MGTE compressor, on a 1HD-T produced useful boost around 17-1800rpm (10 psi, and 15 psi by about 2000rpm). It made quite a bit more low end torque than stock turbo, and it was making strong power right up to around 3500+rpm. The turbo was quieter across the rev range.
My 1HD-FTE turbo (6cm turbine housing, smaller, more modern turbine, same size compressor as 7MGTE) on my 1HZ is producing strong boost from around 12-1300rpm.
Same size engines, both fueled up a bit, but not over the top. 1HZ has higher compression, so has better low end torque before the turbo spools.
12HT are a torquey beast, but 4.0 litre vs 4.2.
With a 7cm turbine housing, and Supra compressor, you'll have a pretty decent upgrade over stock. Earlier boost with the 7cm housing, more torque due to higher airflow, better response at all rpm, more mid range power. The top end power may suffer a little as the smaller turbine housing will be restrictive at high rpm
Well worth while IMO. Good bang for your buck.
Not as impressive as the gturbo types, but nothing to be sneezed at either.
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THX, that's what I was thinking and hoping you would confirm 
Can't wait to get that 12ht rebuild, in my car and tuned
Can't wait to get that 12ht rebuild, in my car and tuned
I agree that this will be a great improvement over stock. My Mamba hybrid has a td05h CHRA which has a slightly smaller turbine and a 7cm housing grafted on ...casting number 17020 I think. And an 11 blade 18g on the compressor side. I recently switched from a 9 blade turbine wheel to a standard Kinugawa 12 blade.
WOW what an improvement. Starts boosting about 1500rpm making 20 psi by 1600rpm then 24 psi right to redline. Egt are way down and response is fantastic. The Mamba bolt on is worth considering. Mine has around 15 or 20,000 km on it know and still tight and strong running. Service was poor at Mamba after the sale so I bought a Kinagawa turbine, they provided great service. The Mamba was a bolt on???? Almost. As with most aftermarket it takes a little work. See my other posts regarding install.
Lots of options....many of them are an improvement over the stocker.
There is no reason to go supra hybrid. Just get a 1HD-FTE turbo and make it fit. It's got a supra size compressor and a better turbine.
mudgudgeon
Resident galah
That was my conclusion. I have a 1HD-T/7MGTE hybrid sitting in the shed that I won't use.
I think mamba do a 1HD-FTE replacement if you're thinking of going mamba.
It won't quite be bolt in, but a fairly simple adaptation.
The Mamba I purchased uses a 1HDT housing and bolts to the manifold and exhaust.
mudgudgeon
Resident galah
1HD-FTE turbo has same flanges on the exhaust housing, so it will bolt up to the exhaust and manifold. Compressor housings are different. The core is smaller and uses a different casting, oil and water lines may not be a direct bolt in. I found I had to tweak the oil lines to make it work.
I wouldn't bank on a 100% bolt in
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The reason why I wan't to stick to that hybrid is chash only. Getting a supra CHRA and the small turbine housing will cost 500€, everthing else I have seen is twice the price .... But I understand what you mean - better desing, better effiency ( less fuel ? ), better performance, more fun
The downside is that it does not look like the original .....
The downside is that it does not look like the original .....
mudgudgeon
Resident galah
Better turbo efficiency, (not fuel efficiency)
Better turbo efficiency directly translates to better fuel economy (as long as you drive the same speeds as prior).
I've found ~1 litre/100km difference between turbos. All else being the same.
Been looking on Holset turbos lately, how well would a 12H-T and HX35 Super come together?
Main benefit over old CT26 would probably be light years more modern design, faster spooling and greater efficiency.
Fitting a Holset turbo would not be nowhere close to bolt-on, but a lot cheaper option than G-Turbo and others.
PLUS, you can find used units for cheap from time to time.
Compressor: 54/77mm
Turbine: 65/55mm
Turbine housing: Single entry T3 8cm
Main benefit over old CT26 would probably be light years more modern design, faster spooling and greater efficiency.
Fitting a Holset turbo would not be nowhere close to bolt-on, but a lot cheaper option than G-Turbo and others.
PLUS, you can find used units for cheap from time to time.
Compressor: 54/77mm
Turbine: 65/55mm
Turbine housing: Single entry T3 8cm
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So is a HDFTE Turbo more efficien, modern or is it just better in term s of wheel size ?
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Terrible. HX35 is too big for all but 3000rpm and up. Standard exhaust housing on those is 12cm. Going any smaller just drives them into surge at lower rpm.
HX30 Super (46mm compressor intake, 6cm exhaust housing) is the best match and a very good turbo. But it's a more active turbo than most are fitting on Toyota 6's. Best use is low rpm sloggers like Isuzu 4BD1T and Cummins 4BT. It would however be a very good high-altitude turbo on a Toyota 6 cyl.
Yes. Turbine design (CT20B) is much newer and better than CT26.
Even with 8cm exh. housing? Turbine is just a tad bigger than stock CT26.
What size compressors G-Turbo uses on his high output turbos?
HX30 looks to be about the same as 7M Ct26 but with smaller exhaust housing, i would imagine that to be a problem on highway?
The reason i'm asking i've heard good results on hx35/12 1HD-T combo. I know 1HD-T is way different from 12H-T, but still.
Standard exhaust housing on those is 12cm. Going any smaller just drives them into surge at lower rpm.
Why would it be a problem on the highway? It was factory fitted to 4.2L diesels.
The 4BT crowd used to say the HX35 was good too. Turned out those people had never used a good turbo. Got them onto HE221's and HX30's instead and no-one uses the HX35 anymore.
The HX35 is a good turbo for a 6 litre diesel and a terrible turbo for a 4 litre diesel.
