1HZ turbo question ?

[123456]

I am not sure if I am posting this in the right place if not mod's please move it .


I have a 1991 HZJ75 with a 1HZ in it it has 330,000km's on the clock and I am starting to think about doing a rebuild in the future I would like to turbo the engine .

If you were to build a 1HZ to be turbo'd what would you use in the way of pistons turbo's cam , head and so forth ?


I have done a search but most of what I found was a few years old I just would like to see what you guy's are doing now .

Do you know of any good write ups on this subject ?


Thanks Dave .

 

[123456]

Also this vehicle will be used for on hi way driving as well as offroad use . I would like to make something that pulls very well .

But also must still be reliable as it is my daily drive .

 

[BreckenridgeCruiser]

There is a balance between more power and longevity of the engine. The 1HZ is a workhorse engine and while it can take may performance mods that would supplement the turbo's extra power, it will lessen the life of the engine.

Most likely you haven't seen anything new as the turbo setups from a few years ago are proven to be a good blend of additional power and nominal additional strain on the engine components. Most of us are more interested in maintaining a lifetime engine then squeezing a few more horses or Ft/lbs out of a tractor motor.

The only thing I would recommend is to look into the Garrett GT line as the newer turbos have some really nice technical advancements that can really improve both performance and reliability.

 

[123456]

I thought it may be the case that there hadn't been much more improvement in the last few years , after all the 1HZ has been around a wile now .

I dont want to build massive horsepower , just pull a bit better up hill's and thru the tight stuff .

The Garrret GT line of turbo seem to be very popular .


Thanks for your reply .

 

[Tapage]

Living in Australia you have several local options with bolt on turbo kits .. the best most reliable and maybe not the most expensve alternative it's just put your hands in 1HD-T exhaust manifold, turbo ( CT26 ) and misc parts that you need to run that turbo in your 1HZ engine ..

 

[Tim-HJ61]

Living in Australia you have several local options with bolt on turbo kits .. the best most reliable and maybe not the most expensve alternative it's just put your hands in 1HD-T exhaust manifold, turbo ( CT26 ) and misc parts that you need to run that turbo in your 1HZ engine ..

GBentink has got the gear for you. PM him for some options.

Meant for the OP not Tapage.

Tim

 

[123456]

GBentink has got the gear for you. PM him for some options.

Meant for the OP not Tapage.

Tim

Thanks Tim I will get in touch with GBentink

 

[gbentink]

You have a PM.

Actually I havent released the kit yet but I am in the process of building up 5 kits for the 1HZ. I have managed to buy 5pcs brand new 1HDT manfolds from Toyota.

I obviously can do the turbo (and have now the gaskets, oil lines and manifold), but I still need to sort out things like pipes from Air filter to turbo and fitting from turbo to the air intake and the dump pipe

Fortunately I have a 1HZ here to test fit the gear on to.

Regards, Graeme

Thanks Tim I will get in touch with GBentink

 

[ForealBoreal]

You have a PM.

Actually I havent released the kit yet but I am in the process of building up 5 kits for the 1HZ. I have managed to buy 5pcs brand new 1HDT manfolds from Toyota.

I obviously can do the turbo (and have now the gaskets, oil lines and manifold), but I still need to sort out things like pipes from Air filter to turbo and fitting from turbo to the air intake and the dump pipe

Fortunately I have a 1HZ here to test fit the gear on to.

Regards, Graeme

Graeme I would be curious to know in the end what your kit is going to cost. Just email me if you read this and you get it all sorted out.

 

[123456]

Ok so I have been reading up on GBentink's turbo and I must say I am very interested in it .I would like to try them on the 1HZ, I have been in contact with Graeme .

Tim , thank you for pointing me in the wright direction .

 

[Volcano cruiser]

You have a PM.

Actually I havent released the kit yet but I am in the process of building up 5 kits for the 1HZ. I have managed to buy 5pcs brand new 1HDT manfolds from Toyota.

I obviously can do the turbo (and have now the gaskets, oil lines and manifold), but I still need to sort out things like pipes from Air filter to turbo and fitting from turbo to the air intake and the dump pipe

Fortunately I have a 1HZ here to test fit the gear on to.

Regards, Graeme

Graeme,
I have been following your work and it really sounds interesting. As a follow on to the OP's initial question and his mention of pistons. If doing a rebuild and you know that you want to run a turboed 1HZ, do you think that there is a marginal advantage to running the 1HD-T pistons in a rebuilt 1HZ-T? Thanks.
John

 

[Dougal]

Graeme,
I have been following your work and it really sounds interesting. As a follow on to the OP's initial question and his mention of pistons. If doing a rebuild and you know that you want to run a turboed 1HZ, do you think that there is a marginal advantage to running the 1HD-T pistons in a rebuilt 1HZ-T? Thanks.
John

To run HD-T pistons you need to run HD-T head and injectors. In which case you have a DIY 1HD-T.
Big advantages in strength, cooling, fuel economy, power and coolness.

 

[Volcano cruiser]

To run HD-T pistons you need to run HD-T head and injectors. In which case you have a DIY 1HD-T.
Big advantages in strength, cooling, fuel economy, power and coolness.

Dougal,
That is exactly what I thought. Thanks for the confirmation. Sounds like the way to go for a rebuild if it ever comes to that.
John

 

[gbentink]

Graeme,
I have been following your work and it really sounds interesting. As a follow on to the OP's initial question and his mention of pistons. If doing a rebuild and you know that you want to run a turboed 1HZ, do you think that there is a marginal advantage to running the 1HD-T pistons in a rebuilt 1HZ-T? Thanks.
John

Actually there is a kit available in Oz now that changes the 1HZ pistons to 1HZ-T pistons. The pistons have the 33mm gudgeon pin of the 1HDT piston (instead of 29mm of the 1HZ), much thicker crown but of course still IDI. The kit comes with 1HDT conrods as well. You cant just use 1HDT pistons without changing the head - in DI the combustion occurs in the piston, in IDI it occurs in the head as a rich burn and shoots rich semi oxidized mix into the remaining air in the squish area.

The benefit is, so long as you put steam bleeds in the head for each cylinder like the TD42 guys do, that using one of my turbos and ~ 23psi, you can get a nice to drive 140-150kW @ wheels (or even higher) just the same as the TD42 guys but with a nice OHC and smoother engine This is rather more than the 45kW @ wheels that you have now (slooooow....).

Of course you can use the 1HDT pistons and rods and replace the head, injectors, pump and injector lines and you have a 1HDT with better fuel economy and more torque and power for the same amount of fuel burn....

Still, it is an excellent option and the kit is well priced.

Cheers

 

[123456]

Graeme

Can you enlighten me on the piston kit you are talking about ? I have been searching but have not found much info on a better piston for the 1HZ , it seems it the piston that lets the engine down ?

With this kit you talk about you are not changing the head just the pistons and rod's ?

Thanks again Dave .

p.s I have found some piston's from engines Australia That you need to use with 1HDT rod's I just rang them and they said they have piston's .

 

[gbentink]

SMS Diesel do the same pistons that Engines Australia offered you but do the rods as well. Ask for a Turbo rebuild kit for a 1HZ

Graeme

Can you enlighten me on the piston kit you are talking about ? I have been searching but have not found much info on a better piston for the 1HZ , it seems it the piston that lets the engine down ?

With this kit you talk about you are not changing the head just the pistons and rod's ?

Thanks again Dave .

p.s I have found some piston's from engines Australia That you need to use with 1HDT rod's I just rang them and they said they have piston's .

 

[Volcano cruiser]

Actually there is a kit available in Oz now that changes the 1HZ pistons to 1HZ-T pistons. The pistons have the 33mm gudgeon pin of the 1HDT piston (instead of 29mm of the 1HZ), much thicker crown but of course still IDI. The kit comes with 1HDT conrods as well. You cant just use 1HDT pistons without changing the head - in DI the combustion occurs in the piston, in IDI it occurs in the head as a rich burn and shoots rich semi oxidized mix into the remaining air in the squish area.

The benefit is, so long as you put steam bleeds in the head for each cylinder like the TD42 guys do, that using one of my turbos and ~ 23psi, you can get a nice to drive 140-150kW @ wheels (or even higher) just the same as the TD42 guys but with a nice OHC and smoother engine This is rather more than the 45kW @ wheels that you have now (slooooow....).

Of course you can use the 1HDT pistons and rods and replace the head, injectors, pump and injector lines and you have a 1HDT with better fuel economy and more torque and power for the same amount of fuel burn....

Still, it is an excellent option and the kit is well priced.

Cheers

Graeme and Dougal,
Then to sum this up if/when it is time for a rebuild of my 1HZ and I want to gain better fuel economy, torque and power I could reach that goal, keeping the same bullet proof reliability, by doing the following:
Either by kit or sourcing the parts replace:
1HZ Head with 1HD-T Head
1HZ Pistons with 1HD-T Pistons
1HZ Injectors with 1HD-T Injectors
1HZ Con rods with 1HD-T Con rods (aren't these the same part number?)

Graeme, I'm not sure what all else comes in the kit if you either know or have a link that would be great. Second, does the 1HD-T head that comes with the kit come with the steam bleeds already done, (please explain this and what the benefit of this adaptation is)?

Right now I'm running one of the CT-26 turbo variants with the 1HD-T manifold. Your kit contains:
CT-26 turbo (your spec)
Gaskets
Oil lines
1HD-T manifold
What else? Sorry to ask but I found a link to your site which was broken. Also I think that I read that you'd take my current CT26 and manifold as a core swap, is that right?
Thanks.
John

 

[gbentink]

Graeme and Dougal,
Then to sum this up if/when it is time for a rebuild of my 1HZ and I want to gain better fuel economy, torque and power I could reach that goal, keeping the same bullet proof reliability, by doing the following:
Either by kit or sourcing the parts replace:
1HZ Head with 1HD-T Head
1HZ Pistons with 1HD-T Pistons
1HZ Injectors with 1HD-T Injectors
1HZ Con rods with 1HD-T Con rods (aren't these the same part number?)

Graeme, I'm not sure what all else comes in the kit if you either know or have a link that would be great. Second, does the 1HD-T head that comes with the kit come with the steam bleeds already done, (please explain this and what the benefit of this adaptation is)?

Right now I'm running one of the CT-26 turbo variants with the 1HD-T manifold. Your kit contains:
CT-26 turbo (your spec)
Gaskets
Oil lines
1HD-T manifold
What else? Sorry to ask but I found a link to your site which was broken. Also I think that I read that you'd take my current CT26 and manifold as a core swap, is that right?
Thanks.
John

John,

Just for clarification, the 1HDT piston design cannot be used with the 1HZ head, BUT, there is a stronger piston designed to work with the 1HZ head and 1HDT con rods to allow higher power more reliably.

1HZ and 1HDT con rods are very different, for starters the little end is 29mm on the 1HZ and 33mm on the 1HDT.

To get the greater fuel economy, then you must convert the 1HZ to a 1HDT, so it becomes then direct injection (this is the reason for the economy improvement). This is a much bigger change. For this you need 1HDT (pistons + rods + head + injectors + inj pump + inj lines).

If you want to upgrade your turbo (already a CT26), then I dont need your manifold, in fact I dont really even need your turbo (Europe is so expensive for post, I am better buying a used one from Australia off eBay for $80). I would just send you a optimised GTurbo when you give the word.

The upgrades come in many different forms - If you want to run 23+psi you will get a very different spec than 15psi. I need to know what you are chasing as far as end result is concerned to enable the right mods to be done.

 

[Volcano cruiser]

John,

Just for clarification, the 1HDT piston design cannot be used with the 1HZ head, BUT, there is a stronger piston designed to work with the 1HZ head and 1HDT con rods to allow higher power more reliably.

1HZ and 1HDT con rods are very different, for starters the little end is 29mm on the 1HZ and 33mm on the 1HDT.

To get the greater fuel economy, then you must convert the 1HZ to a 1HDT, so it becomes then direct injection (this is the reason for the economy improvement). This is a much bigger change. For this you need 1HDT (pistons + rods + head + injectors + inj pump + inj lines).

If you want to upgrade your turbo (already a CT26), then I dont need your manifold, in fact I dont really even need your turbo (Europe is so expensive for post, I am better buying a used one from Australia off eBay for $80). I would just send you a optimised GTurbo when you give the word.

The upgrades come in many different forms - If you want to run 23+psi you will get a very different spec than 15psi. I need to know what you are chasing as far as end result is concerned to enable the right mods to be done.

Graeme,
Understood on the head/ piston point, I probably didn't express myself clearly. It looks like the only items that I missed from my "1HZ upgrade list" were switch out the 1HZ injector pump and lines for the 1HD-T injector pump and lines.

I did not know that there is a stronger piston that is designed to work with the 1HZ head and 1HD-T con rods. Do you know who makes that piston? What about the piston is stronger? Is there a difference in the formation of the piston crown? This seems like a nice interim way to upgrade engine components, keep reliability and gain some power. Any more info or links to where I can get the info would be appreciated.

Seriously, $80 for a used CT26 on Aussie ebay. That is just so unfair. For that price I almost want to get one of yours, tuned to what I want out of the engine and send you the one that I have for a rebuild to your specs and use that one for a future project. Thanks.
John

 

[gbentink]

John, SMS Diesel do the turbo spec kits for the 1HZ. All 1HZ's, per experience in Australia, when pushed too hard (over ~100rwkW) when turbocharged will crack pistons, the turbo pistons are all round stronger and then pushing 150rwkW is ok (pistons OK, extra cooling in head likely required). I'm not sure who makes them, but the quality of the rebuild kits we buy here appear to be at least as good as OEM, so rarely does anyone buy OEM. In fact, it seems that SMS buy the pistons from the same manufacturer as OEM's, because the Nissan TD42 kist for example are non genuine but have "UD" stamped on the pistons same as OEM.... I am certain its not a copy, they just come from the same OEM source.

Sometimes I pay $30 for turbo and $50 postage... sometimes I pay $150, just depends on the day