The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread
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because the engine has 430thsd km on its clock!
why should I squeeze more out of it?
It runs good as it is and has decent torque and power.
No reason for me to get more as it is now
Here in South Africa the engines are rare and a complete rebuild is pretty expensive
why should I squeeze more out of it?
It runs good as it is and has decent torque and power.
No reason for me to get more as it is now
Here in South Africa the engines are rare and a complete rebuild is pretty expensive
If you think a stock 1hdfte makes that much power / torque on a dyno you're very mistaken! They can after tuning but absolutely not in stock form
My EGT are fine, running low.
Boost maybe, the actuator I use is not acurate (Mamba rubbish!)
I pushed the car up on the local mountains here without getting worried about high egt´s
And I can easily overtake a slower car now.
As I said, its ok for now, much better what I had befor
Boost maybe, the actuator I use is not acurate (Mamba rubbish!)
I pushed the car up on the local mountains here without getting worried about high egt´s
And I can easily overtake a slower car now.
As I said, its ok for now, much better what I had befor
You are smoking which fills your oil up with soot. A retune with more boost and less aggressive boost compensator will be much, much, kinder on your engine.
Where is your EGT probe and does it reach mid-stream?
Hi guys, I've installed an arashi td05-16 large on my 1HDT and it's seems awfully slow to spool, doesn't hit full boost of 19psi (I've installed a boost tee.) Till after about 2100rpm and even drops boost between 3rd and 4th which cause egts to spike up. Max egts under load on a hill are about 685 pre .
I've done injectors 3 inch exhaust and big end bearings recently. Any ideas please?
I've done injectors 3 inch exhaust and big end bearings recently. Any ideas please?
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What exhaust housing and turbine wheel do you have?
8cm2 and 12 blade
Yeah the TD05-16G large (48.5mm inducer) is too large and always runs in an area of low efficiency. You need a better sized compressor. 16G small (46.5mm inducer) is better but still not a good fit for these engines.
Also 7cm turbine housing is way better than 8cm.
FYI, your choice of text colour is totally unreadable for anyone who uses the dark screen option for viewing Mud
They're arnt a bunch of modified Toyota diesels around here for me to compare it to but I got to say I think the holset he250 8cm and twinscroll manifold is a great match for these motors. Pretty much no lag at all, driving my truck and a stock one w/ boost gauge back to back mine is in boost quicker and still doesn't feel like it's choking the engine from back-pressure at higher RPM. I've only gotten it up to 25psi so far. Stock wastegate is set to 30 so it hasn't even opened yet. Very mild tune right now for break-in haven't hit 1000f egt yet, still pretty quick.
hallo everybody, me also from italy playng with upgrade on my two ct26. first step of my adventure was step up from 5+5 to 6+6 keeping all original parts of ct26 block. @the moment the car is stopped for swapping turbo and other job, soon i will test it on road. I need only a little more air flux to low rpm, from 1000 to 1600. When original 5+5 ct26 will be mapped on test bank, i will comprare diagrams with upgraded 6+6. next step is to try another step up by using aluminium 11+0 48,3-64,89 wheel on the original aluminium part of ct26 coming from toyota supra,larger than ct26 oh hdj80.
thanks a lot for your marvelous topic.
thanks a lot for your marvelous topic.
What are the wheel measurements on the HE250 and which engine is it off?
One big problem with the Toyota turbos is no published compressor or turbine maps. But we can estimate them pretty well from measurements. The biggest problem with the CT26 turbos are old, inefficient, turbine designs and large turbine housings. Those need improved to get good response and more boost sooner.
turbine: 59mm/ 49mm
compressor: 69mm/50mm
looking up the part number on parts.cummins.com it says it's used on a 8.1L in china.
i bought mine from ebay china but benzforce has them now.
Remanufactured Holset HE250 8cm2 Twin Scroll
This listing is for a Holset HE250. These are very hard to source, thus you will often see them out of stock. Model: HE250WG Exhaust: 59/49 mm Compressor: 69/52 mm This turbo should prove to be a great addition to an om60x with a modified injection pump. TWIN SCROLL T3 manifold flange...
www.benzforce.com
from what i can look up seems like its a newer design came out in about 2020 or so.
I also have a 6cm with the same size wheels for another project and I've seen a 9cm (not sure what size wheels)
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Toyotone was taken out of service a few days ago for a series of maintenance operations, including the replacement of the original turbine with its twin, upgraded with a 6+6 impeller. The first thing worth noting is that the dismantled CT26, with 500,000 km on the clock, is in excellent condition, with absolutely minimal mechanical tolerances. This turbine operated at peaks of 1.1 atm thanks to an extra valve that partially closed the waste gate. It was a pressure that was rarely reached, but during some long climbs I was able to read that value for a few seconds, then lift my foot off the pedal after indulging my desire to read the pressure gauge. The turbine now fitted has a 6+6 impeller but is identical to the original in terms of dimensions and my desire to fill a slight gap below 1400 rpm where the engine struggled a little to rev up in gears 3-4-5. The turbine works at the pressure of the original waste gate, which should be 0.74 or 0.84, I don't remember, I have to reinstall the pressure gauge, but in any case about 0.4 atm less than the original turbine. Despite this difference in pressure, the benefit is noticeable because the smoke between 1000 and 1400 is greatly reduced, gaining responsiveness and a linearity that was previously unknown to me. Let's be clear, it hasn't become a Celica. Continuing to drive uphill and downhill, I noticed a slight decrease in engine braking and a noticeable but not excessive increase in intake noise at the snorkel mouth with a slight whistling sound during gear changes.
I'm not sure if there is much interest in any more holset turbo tech but I'm going to share anyway. I picked up a 9 CM he250. I figure my current 8cm has about no lag at all so stepping up to a 9cm may help it breath a little better on the freeway or max output (not that it feels choked out) the compressors on both are exactly the same. the turbine wheels are different.
both 6cm and 8cm versions have the same wheel sizes:
turbine: 59mm/ 49mm 10 blade
compressor: 69mm/50mm
the 9CM has a larger turbine wheel, may introduce more lag then i was hoping for not sure until i try.
turbine 63/54 11 blade
there are 2 other things going for the 9cm: standard 3" vband outlet, no odd ball metric vbands that are not available (or turn it into a standard size on the lathe) and also the waste-gate actuator looks like it will fit a 1H engine without modification.
probability going to put this on the next swap project.
black one is a 6cm and silver is the 9cm
both 6cm and 8cm versions have the same wheel sizes:
turbine: 59mm/ 49mm 10 blade
compressor: 69mm/50mm
the 9CM has a larger turbine wheel, may introduce more lag then i was hoping for not sure until i try.
turbine 63/54 11 blade
there are 2 other things going for the 9cm: standard 3" vband outlet, no odd ball metric vbands that are not available (or turn it into a standard size on the lathe) and also the waste-gate actuator looks like it will fit a 1H engine without modification.
probability going to put this on the next swap project.
black one is a 6cm and silver is the 9cm