Factory 1HZT

[Snailtrail]

First up, apologies if this has been covered before as my attention to 1HZ topics has been somewhat lacking...

I've always been under the impression that the 1HZ was only ever offered from the factory as a N/A (non turbo) engine, and the engine code 1HZ-T used by people that have added the turbo/manifold from a 1HDT to their 1HZ.

I recently got my hands on the 'General Area' EPC, and found myself looking at the engines fitted to the 'Coaster' bus range.

There along with the 1HZ was a 1HZT.

It is fitted to the 9301-9605 HZB50 for General markets except SCO (Some Countries Only - Hong Kong, Singapore), ARL (Australia) and GCC (Gulf Corporation Council).

I just thought i would throw this around, maybe someone is running one and can provide additional info, maybe some pictures...

The factory engine lable might be cool for those running a 1HZ-T

[Dougal]

The 1HZ T was sold in 70 series cruisers (check Roscoe's avatar) in NZ and Australia up until recently.

It's now been replaced with their new V8 diesel, in a highly derated form.

[roscoFJ73]

I think its a printing error. You may notice they have omitted the 1HD T from the parts list .The 1HD T was widely sold in oz in Landcruiser and the Coaster.

Also a turbo Coaster has the alpha code as HDB according to my FSM.

[Snailtrail]

Ahh right, cheers for that. Something didnt seem quite right there.

[PacToy]

To add to the mystery, I was once was shown a 2003 Toyota Land Cruiser brochure that stated this model year 79s came with a base 1HZ or an optional 1HZ-T.

The brochure was from the Naha Toyota dealership in Okinawa. The HZJ79s were for special order and none were on the lot.

I think rosco's guess makes the most sence. I have never seen or heard of a 1HZ-T other than that brochure.

[crushers]

there NEVER was a 1HZT from the factory in any of the Land Cruiser line-up, the 1HDT or the 1HZ was offered.

the direct injection engine was the 1HDT and the non-turbo 1HZ was an indirect injection engine. to me the indirect injection engine would be a nice turbo'd engine since it would eliminate the sensitive throttle that is experienced with the direct injected Toyota engines coupled to a manual tranny.

the 1HZ-T is an after market turbo fitted to a NA 1HZ engine. this is a common designation we apply to our engines once we turbo them on Mud.

[PacToy]

Originally Posted by crushers

there NEVER was a 1HZT from the factory in any of the Land Cruiser line-up, the 1HDT or the 1HZ was offered.

the direct injection engine was the 1HDT and the non-turbo 1HZ was an indirect injection engine. to me the indirect injection engine would be a nice turbo'd engine since it would eliminate the sensitive throttle that is experienced with the direct injected Toyota engines coupled to a manual tranny.

the 1HZ-T is an after market turbo fitted to a NA 1HZ engine. this is a common designation we apply to our engines once we turbo them on Mud.

Hey Wayne-o,

Your running mud through your turbo?

I have never heard of that before. Can you post up some diagrams of how this new technology works?

I don't think the 1HZ-T was made to run on mud.

[crushers]

didn't you know you use mud to increase the combusion pressure and to cool the charge... right up there with water injection but for more extreme working pressures...














LOL!! that is what i get for posting at 3:30 am...

[Tapage]

Here a few Coaster that come ( only few ones coz the route driver are enought smart to blow head each month ) with 1HD-T engines ..

But that pic looks like interesting .. and I believe all from Toyota ..

[crushers]

after some more checking to get my facts straight no 70 series (anywhere) came with a 1HZ-T or a HDT till after 1998 at least.

[Entaran]

There are however probably at least 10,000 turbocharged 1HZ's getting around Australia, along with untold numbers of 1HD-T, 1HD-FT, 1HD-FTE and whatever the last (newest) 1hz turbo version is... and now the new v8's.

[Gerrit Loubser]

Originally Posted by roscoFJ73

I think its a printing error. You may notice they have omitted the 1HD T from the parts list.

I think it is genuine. Looking at the numbers of the major engine components on EPC I found that the 1HZ-T motor uses

• a different head to the 1HZ although both are indirect injection heads (unlike the 1HD-T or 1HD-FT)
• a different head gasket to the 1HZ (although the 1HZ and 1HD-T use the same part number here)
• different pistons to the 1HZ
• a different injection pump to the 1HZ, 1HD-T or 1HD-FT
• a different turbocharger to the 1HD-T or 1HD-FT

and

• the same pre-injection chamber inserts (cups) as the 1HZ
• the same main bearings as the 1HZ, 1HD-T and 1HD-FT
• the same big end bearings as the 1HZ, 1HD-T and 1HD-FT
• the same rings as the 1HZ, 1HD-T and 1HD-FT
• the same crankshaft as the 1HZ, 1HD-T and 1HD-FT
• the same small-end bearings as the 1HD-T and 1HD-FT (different to 1HZ items)
• the same intake pipe as the 1HD-T

From this it is clear that the 1HZ-T is an indirect injection turbo diesel. The fact that it uses different pistons and heaad gasket to the 1HZ is probably due to the need to drop the compression ratio.

It is strange that Toyota did an indirect injection turbo diesel alongside their direct injection ones, but the EPC evidence seems to suggest that the 1HZ-T actually exists and is more than a typo.

[mac]

Holy thread resurrection! Have you been researching this these past few months? Let the debating begin!

[roscoFJ73]

Until someones shows me a pic of the aluminium plate Toyota affix to firewalls with 1HZ T as the engine it was supplied with,I remain unconvinced.

[Dougal]

Mellet list a turbocharger for the 1HZ-T.
http://www.melett.com/turbo-parts-ca...ota/Toyota.pdf

Check out the application list at the end Coaster Bus HZB50 model code, years 93-96.

I find it interesting how strongly people are denying it's existance.

[Gerrit Loubser]

Originally Posted by roscoFJ73

Until someones shows me a pic of the aluminium plate Toyota affix to firewalls with 1HZ T as the engine it was supplied with,I remain unconvinced.

I am not able to do that. The Coaster was never sold in South Africa and I have certainly not seen a factory 1HZ-T (although I have seen plenty turbo conversions of the 1HZ).

Perhaps the Coaster with 1HZ-T was never actually sold in Aussie. When I checked EPC it showed that the HZB50R Coaster with 1HZ-T was destined for Europe. Eaton Truck Europe, Middle East & North Africa make mention of a 1HZ-T powered Coaster in their Toyota Clutch Catalogue.

[roscoFJ73]

Originally Posted by Dougal

I find it interesting how strongly people are denying it's existance.

I find it intersting how much faith people have in something that has never been seen in the flesh
Someone who no longer visits this site showed me a reference to the 1HZ T some years back.
That person and I looked long and hard for proof ,and there is none that I can see,except for this reference .

Engines Aust also have it mentioned in their catalog but not Toyota Aust :alarm bells ringing:

The proof is in the pudding gentlemen,and we have no pudding.

[roscoFJ73]

Originally Posted by Gerrit Loubser

I am not able to do that. The Coaster was never sold in South Africa and I have certainly not seen a factory 1HZ-T (although I have seen plenty turbo conversions of the 1HZ).

Perhaps the Coaster with 1HZ-T was never actually sold in Aussie. When I checked EPC it showed that the HZB50R Coaster with 1HZ-T was destined for Europe. Eaton Truck Europe, Middle East & North Africa make mention of a 1HZ-T powered Coaster in their Toyota Clutch Catalogue.

We are looking for the pudding ,not the recipe.

[Gerrit Loubser]

Perhaps I have too much faith in Toyota's tech doc department. Seems strange though, that all the detail is in EPC if it does not exist physically...

[Dougal]

Originally Posted by roscoFJ73

I find it intersting how much faith people have in something that has never been seen in the flesh
Someone who no longer visits this site showed me a reference to the 1HZ T some years back.
That person and I looked long and hard for proof ,and there is none that I can see,except for this reference .

Engines Aust also have it mentioned in their catalog but not Toyota Aust :alarm bells ringing:

The proof is in the pudding gentlemen,and we have no pudding.

Why would Toyota Australia care about a vehicle that was never sold there?

Here're the auction results from an HZB50 that was sold out of japan.
Toyota Coaster 1998 - sales at japan used cars auction

Here's an HZB56 that's currently for sale in NZ.
Bus detail
Here're the chassis and engine numbers, someone can run them and let us know.
TOYOTA COASTER 2001 (in White with Blue) : Plate: EGW367 | CarFax

Here's an HZB50
Bus detail
Unfortunately I can't quite read the plate.

Here's another HZB50, specifically listed as non-turbo.
Toyota Coaster HZB50 1996 for sale - TradeMe.co.nz - New Zealand

Here's your mythical HZB50 advertised as turbocharged.
TOYOTA COASTER (for 29 PASSENGERS) - JETRO TTPP(Trade Tie-up Promotion Program)

[roscoFJ73]

Originally Posted by Dougal

Why would Toyota Australia care about a vehicle that was never sold there?

Here're the auction results from an HZB50 that was sold out of japan.
Toyota Coaster 1998 - sales at japan used cars auction

Here's an HZB56 that's currently for sale in NZ.
Bus detail
Here're the chassis and engine numbers, someone can run them and let us know.
TOYOTA COASTER 2001 (in White with Blue) : Plate: EGW367 | CarFax

Here's an HZB50
Bus detail
Unfortunately I can't quite read the plate.

Here's another HZB50, specifically listed as non-turbo.
Toyota Coaster HZB50 1996 for sale - TradeMe.co.nz - New Zealand

Here's your mythical HZB50 advertised as turbocharged.
TOYOTA COASTER (for 29 PASSENGERS) - JETRO TTPP(Trade Tie-up Promotion Program)

We have 1000s of HZB50 in oz but none are turbo.. There is a japanese site that sells hundreds of coasters with engine pics and none of the HZB Coasters had turbos.

The ones that did were labelled HDB50/30
None of your links mention they are turbo models(which would make them more attractive to a buyer)


Think about it rationally.Why wouldToyota make 2 turbo engines from 93-95 for one vehicle?
Coasters currently cost nearly $100000AUD ,what would they save by turboing a 1HZ at the factory?
My guess is the EPC is a mistake and where it says 1HZ T it should read 1HD T.
The EPC says they were sold in oz,Toyota aust says they were not sold here. The EPC is showing errors in more places than one

[Gerrit Loubser]

Originally Posted by roscoFJ73

None of your links mention they are turbo models(which would make them more attractive to a buyer)

Except this one?

Originally Posted by Dougal

Here's your mythical HZB50 advertised as turbocharged.
TOYOTA COASTER (for 29 PASSENGERS) - JETRO TTPP(Trade Tie-up Promotion Program)

Or am I missing something?

[Dougal]

Originally Posted by roscoFJ73

Think about it rationally.Why wouldToyota make 2 turbo engines from 93-95 for one vehicle?

Two very good reasons.
Emissions and noise.
The smoke startup of a direct injection diesel probably wasn't welcomed in many areas the buses would be working. Indirect injection is also quieter.

If they needed the combination of low startup smoke and turbocharged power, it'd make a lot of sense to simply turbo their IDI engine.

[PacToy]

Originally Posted by roscoFJ73

I find it intersting how much faith people have in something that has never been seen in the flesh
Someone who no longer visits this site showed me a reference to the 1HZ T some years back.
That person and I looked long and hard for proof ,and there is none that I can see,except for this reference .

Engines Aust also have it mentioned in their catalog but not Toyota Aust :alarm bells ringing:

The proof is in the pudding gentlemen,and we have no pudding.

I'm with you Rosco.

I got into a good argument with my buddy about the 1HZ-T. I told him "no way".

My friend produced a Toyota brochure for a HZJ-79 with and optional engine 1HZ-T.

It was there black in white from Toyota.

I have never ever seen or heard of a 1HZ-T before I saw this special order brochure.

The only response I can say is, I've never seen one on a data plate.

[Gerrit Loubser]

Originally Posted by PacToy

My friend produced a Toyota brochure for a HZJ-79 with and optional engine 1HZ-T.

It was there black in white from Toyota.

In South Africa the Toyota dealers often fitted aftermarket turbo kits to brand new 80 Series or 100 Series (105 actually) vehicles equipped with 1HZ motors. I would imagine that the brochure you refer to was for a similarly converted new pick-up. I am quite certain that Cruisers never had factory 1HZ-T motors. Coaster busses are a different matter, though...

[PacToy]

Originally Posted by Gerrit Loubser

In South Africa the Toyota dealers often fitted aftermarket turbo kits to brand new 80 Series or 100 Series (105 actually) vehicles equipped with 1HZ motors. I would imagine that the brochure you refer to was for a similarly converted new pick-up. I am quite certain that Cruisers never had factory 1HZ-T motors. Coaster busses are a different matter, though...

I'm with you on this.

Never heard or seen one but the brochure written in black and white offered a 1HZ-T. I'm just throwing that out there because it was right there in the brochure.

I can't argue that a 1HZ-T exists. Never seen or heard of one other than that brochure.

IMO, there was never a 1HZ-T from the factory and I will say that until a data plate proves otherwise.

[roscoFJ73]

Originally Posted by Dougal

Two very good reasons.
Emis