1HDT engine install HZJ71

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C

Cruiser71

Joined
Feb 15, 2007
Threads
2
Messages
22
Location
Central America
Hello!! Hope you guys had a great time with your families this past holidays! wish you the best for this upcoming year!

I wanted to know from you guys if it is possible to install a 1HDT engine to a HZJ71 Land Cruiser. I am thinking on replacing the 1HZ engine for the 1HDT. What are your thoughts on this? Has anyone done it? is it viable? What would i need to consider?

Thanks a lot for your input!!
 
contrary to most on this board i am not a big fan of DI Toyota engines...
 
Thanks for Lulo, I already have a turbo kit installed on my 1HZ. Its from AAI (All American Imports), it works great, the only thing is that I have overheating problems whenever i demand from the engine a great deal of continuous power. So, i rather installed a 1HDT, which i think suits better for my purposes, and has more power, than having to look out for EGTs, and other measurements.
 
the HDT is a good engine from everyones view and i have owned a few and they rock, long lasting, torque out the yingyang.

BUT

i do not like the sensitive throttle issue with a manual tranny.
the fuel mileage is poorer than the 1HZ, not much but enough to make me choose the 1HZ.

the basic engines are the same and like i said earlier, it is personal feelings that keep me away from the DI engines. the 1HZ turbo'd kicks a HDT's ass both in power, smoothness off road, fuel economy.

the sensitive throttle issue is bearable, the mileage is acceptable. you will be very happy with the HD-FT (change out the BEBs to be safe).

relax and post a swap thread, my poor old PZ is getting pretty beat up so an engine swap might be in the cards in the future... or i might just retire the old girl and build up a different one altogether...
 
The drawbacks, such as sensitive throttle, poorer mileage etc. would those be true not just of the 1HD-T but also of the 1HD-FT?

I will most certainly post pics and seek advice when I do the swap. But before all that, I have to rebuild the 1hd-ft engine and locate a h15x transmission, which I'm finding out is esp. difficult in my country.

Wayne, I read your thread about doing up a 40 series, with the 1HZ, for a client and I was truly impressed; how easy you made it look. Ever since that I've been imagining buying a 40 series and putting the 1HD-Ft donk it that. What do you think?
 
i would deffinately NOT put the H15* tranny into anything. find a H55F, nicer shifting, better gear spacing.

i think the HDFT would move the 40 down the road very nicely... i have not driven the FT version so i was out of line with my sensitive throttle comments but if it is typical of the Toyota DI engines then as long as you are not doing rough roads, wash boards, corregated roads, then you will probably be fine.

i know Sheldon and Greg love the HDT and maybe i am being too sensitive to the throttle issue. contact them and ask for their opinion, they have had quite a few pass through their hands.

the install is easy, clean and as long as you study the clearence issues into a tighter engine bay then you will be fine.

just don't over look the 1HZ or even the 1PZ, they are both great engines but both really need a turbo installed to really appreciate their potential.
 
I've read of the H55 breaking under the power of the 1HD engines.

I've also read about all sorts of problems with turbocharging the 1HZ, such as premature cylinder head and BEB issues, even with conservative boost levels. On the other hand I've also read about people who've had no problems with the turbo.


Wayne, I know you've turbocharged your PZJ70. What are your thoughts on turbocharging the 1HZ?
 
i have turbo'd a few 1HZ now with no issues.
and on my own test units the boost was at 14-16 psi, over fueled, hitting 1400F often, high rpms.. you know, abused badly and no ill side effects. this was with propane injection installed as well. the H55F has stood the test will stong hard pulls with 35" boots. my best time 0-100 km/hr uncorrected (roughly 120 k/h) 13.4 sec in that truck.
the PZ is the same, abused badly, same setup as the HZ, with no ill side effects...

this isn't to say that it won't happen, it just never happened to me.

there can be extenuating circumstances when the above damage to the engine was done.
what turbo was he running?
what milage on the engine?
how was it maintained?

as for the H55F same questions:
what load was he towing?
has he off roaded it and ramed it from forward to reverse to get unstuck?

i highly doubt that driving down the road at 55 mph would kill a 1HZ.
i also never recommend towing in 5th but that being said we just towed 3000 lbs across canada behind a turbo'd 1HZ / H55F combo with no ill side effects...
 
crushers said:
i have turbo'd a few 1HZ now with no issues.
and on my own test units the boost was at 14-16 psi, over fueled, hitting 1400F often, high rpms.. you know, abused badly and no ill side effects. this was with propane injection installed as well. the H55F has stood the test will stong hard pulls with 35" boots.
Click to expand...

How many hundreds of thousand miles did it last ?

The 1HD-T is a brilliant, smooth torquey engine. Having driven quite of few of them I have never experienced the throttle issue you're mentioning, well with the huge toque you definately get throttle response but absolutely nothing like the 12HT can do.
The H15x trannies are an upgrade from the H55 in strength but definately truckish trannies.
 
yes, i am putting out more hp out the pz than a stock HDT. the R141 is holding up. it came out of a ex-mine rig that had been well abused. i have put roughly 20K on it and it was making noise when i installed it. that is 20K of abused km. if you are running on the highway with light duty off road the R141 will hold up fine.

denis obviously does not agree but if we all agreed then we all would be LN trucks...
 
Cruiser71 said:
Hello!! Hope you guys had a great time with your families this past holidays! wish you the best for this upcoming year!

I wanted to know from you guys if it is possible to install a 1HDT engine to a HZJ71 Land Cruiser. I am thinking on replacing the 1HZ engine for the 1HDT. What are your thoughts on this? Has anyone done it? is it viable? What would i need to consider?

Thanks a lot for your input!!
Click to expand...

You would need only a few alterations like the the 1HZ vacuum metal hose that run behind the water pump.
On a 1HD T the metal tube is for coolant supply to the thermowax on the ACSD on the fuel pump.
IMO ,leave the ACSD disconnected.

I wouldnt have any problems about using the H15* or the H55f.
Plenty of both around here and I dont hear many bad reports about either gearbox.
The early H150 had some bearing or synchro issues in the early days but that hasnt been a problem since.
The HDJ78/89 used the H151 behind the 1HD FTE from 98-07 and now the gearbox is in use behind the 1VD FTE V8
 
Wow, Wayne! Your 1PZ-T puts out more hp than a stock 1HD-T? What is your turbo config like? Have you posted anywhere?

Instead of an engine swap maybe I could just turbo the hell out of the the 1PZ. Is the Denco kit the best out there?
 
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