How do the power and tourque numbers differ for both in just your average 70 Series cruiser?
1HZ-T and 1HD-T
- Thread starter Notmyrealname
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Power and torque will depend on your turbo setup with a 1HZ with a turbo fitted.
Tapage
Club 4X4 Panamá
it's depends also if we are including in the acuation other options .. like intercoolers, how much boost
but what if you were to set some factors up.
a stock 1hd-t runs 10 psi - what horsepower and torque does it have stock.
a stock 1hz - what horsepower and torque does it have
a 1hz-t running 10psi - what horse power and torque does it have
a stock 1hd-t runs 10 psi - what horsepower and torque does it have stock.
a stock 1hz - what horsepower and torque does it have
a 1hz-t running 10psi - what horse power and torque does it have
a stock 1HDT runs 5-8 or 9 psi max, hp should be in around 160-180hp iirc - that's at the flywheel - not at the wheels - so suck up 30 or more percent for the drag. a 1HDT at 10 PSI - I have no idea.
A stock 1HZ is reported at @130 at the flywheel, I dyno'd mine before the turbo and it was 92 iirc with 34 inch tires and a sloppy tranny/transfer. After the turbo install it was 8 psi and a very small pump fuel increase - I think it dyno'd around 126 or 130 - something like that. I told the guy to back off the throttle when the EGT hit 1200. So I think a rough calc made it at about 160hp at the flywheel - for drivetrain loss.
I run 15psi and an intercooler now, I have the fuel turned up but not excessive - there is no smoke at all. No idea what the HP and torque is now but will know soon - when I make some tweaks I'll bring it in for another dyno.
I'll have to search for my exact dyno numbers - they are on mud somewhere. There is a guy in oz putting out 230hp out of his comp truck -sounds great!
A stock 1HZ is reported at @130 at the flywheel, I dyno'd mine before the turbo and it was 92 iirc with 34 inch tires and a sloppy tranny/transfer. After the turbo install it was 8 psi and a very small pump fuel increase - I think it dyno'd around 126 or 130 - something like that. I told the guy to back off the throttle when the EGT hit 1200. So I think a rough calc made it at about 160hp at the flywheel - for drivetrain loss.
I run 15psi and an intercooler now, I have the fuel turned up but not excessive - there is no smoke at all. No idea what the HP and torque is now but will know soon - when I make some tweaks I'll bring it in for another dyno.
I'll have to search for my exact dyno numbers - they are on mud somewhere. There is a guy in oz putting out 230hp out of his comp truck -sounds great!
This may help.
The earlier version of the engine ie: 80 series is covered in this site 80 Series FSM
This is the section that covers the injection pump.
And the following file covers the '98> engines fitted to the 100/105 series.
Excellent info there.
The 1HZ has a calibration range of 59.2-61.2 cc/1000 shots. I used 60cc for the calculations
The 1HD-T has a calibration range of 60.9-66.9cc/1000 shots. I used 65cc for the calculations.
The 1HZ comes out with a BSFC at max torque of ~310g/kwh
The 1HD-T comes out with a BSFC at max torque of ~250g/kwh
This means the 1HD-T is ~20% more efficient than a 1HZ. However some of this is due to the 1HZ not having a turbo. It would be a fair guess to give the 1HZ a 10% efficiency gain when turbocharged, but that still leaves the 1HZ-T producing ~10% less power and torque than a 1HD-T for the same fuel consumption.
really,
i was always under the impression that the 1hz-t would be a crazier engine than a 1hd-t intercooled running at 14.5 psi.
i was always under the impression that the 1hz-t would be a crazier engine than a 1hd-t intercooled running at 14.5 psi.
What gave you that idea?
There is a common misbelief held on this forum that because a IDI engine has a higher compression ratio than a turbo DI engine that if you add a turbo to a IDI engine it will produce more power than a DI engine with a turbo. I've tried many times invain to explain that there is alot more to it than just compression ratio to consider, only to be shouted down by the ill informed mob.
In short there are many, many more engine design principals to be considered than just compression ratio but many people refuse to except this.
Maybe from a numbers standpoint, if you want the most from an engine you can do better with the HD-T. Those are not the only considerations when choosing an engine.
The HZs are more common, have many parts available in North America warehouses, and are cheaper because they are more common and less desirable to (in computer terms it would be "power users").
It isn't the solution for all, but for how quiet and efficient a turbo HZ is carrying a bunch of gear slowly through rough terrain, to not worry about working the truck up a hill or wonder where I can break out for fuel is a really nice thing. I have it set to 9lbs max and find myself usually running 3-5lbs cruising while loaded down (last trip I was at 6500lbs in the 62).
It is not the engine for you if you are into theory craft or gotta have the most. If a person wants a motor that just works well and has reasonable compromises it is a great motor. It isn't a sexy motor like the 12H-T or 1HD-T, but I would choose it again for the easy to get parts over the HD and the quiet running over the 12H. It fits somewhere in between imo.
My dream is to sell the horde below and end up with an HZ troopy and pickup. I can't think of a better platform in a Land Cruiser for what I do.
The HZs are more common, have many parts available in North America warehouses, and are cheaper because they are more common and less desirable to (in computer terms it would be "power users").
It isn't the solution for all, but for how quiet and efficient a turbo HZ is carrying a bunch of gear slowly through rough terrain, to not worry about working the truck up a hill or wonder where I can break out for fuel is a really nice thing. I have it set to 9lbs max and find myself usually running 3-5lbs cruising while loaded down (last trip I was at 6500lbs in the 62).
It is not the engine for you if you are into theory craft or gotta have the most. If a person wants a motor that just works well and has reasonable compromises it is a great motor. It isn't a sexy motor like the 12H-T or 1HD-T, but I would choose it again for the easy to get parts over the HD and the quiet running over the 12H. It fits somewhere in between imo.
My dream is to sell the horde below and end up with an HZ troopy and pickup. I can't think of a better platform in a Land Cruiser for what I do.
I am strongly considering turbocharging a hz. That is one thing I am going to miss about the 81.
To compare the 1HZ efficiency against other idi engines.
The mercedes OM617 (this is the 300sd engine, 5 cyl, 3 litre turbo) has a BSFC of 250 g/kwh.
This is also an idi engine which can allegedly burn anything, also puts out about 100kw yet will burn 20% less fuel than the 1HZ. In fact on par with the 1HD-T.
The Isuzu 4BD2T is a 3.9L turbocharged idi engine which at rated power (105kw) only burns 230g of diesel to produce each kw-hr of shaft power.
At max torque (where the others burn 300 and 250g/kwh respectively) this Isuzu will be burning under 220 g/kwh. Almost 30% better on fuel than a 1HZ and 10% better than the merc.
All these engines were sold in NA, all are available for transplants.
Just some food for thought.
The mercedes OM617 (this is the 300sd engine, 5 cyl, 3 litre turbo) has a BSFC of 250 g/kwh.
This is also an idi engine which can allegedly burn anything, also puts out about 100kw yet will burn 20% less fuel than the 1HZ. In fact on par with the 1HD-T.
The Isuzu 4BD2T is a 3.9L turbocharged idi engine which at rated power (105kw) only burns 230g of diesel to produce each kw-hr of shaft power.
At max torque (where the others burn 300 and 250g/kwh respectively) this Isuzu will be burning under 220 g/kwh. Almost 30% better on fuel than a 1HZ and 10% better than the merc.
All these engines were sold in NA, all are available for transplants.
Just some food for thought.
Don't stress mate if ur happy with the power and driving style of a hdt you will be more than happy with a turbod 1hz just give it some nice boost and fuel they go good
I am not sure if it is the same engine but I believe a fella in our club is installing that Isuzu engine in his 80 series, came out of a delivery van in the states. The big issues are the wiring and computers - but if anyone can figure it out he can. SHould be pretty cool when finished - and probably lead the way to more installs.
The 1HZ definitely isn't perfect or ideal - has shortcomings, can blow up, can be great on fuel, can suck on fuel, can crack pre-cups, can be a nice quiet engine, can have easy parts access, can lack power without turbo, can be a PIA with the r151, and so on and so on........ I like it, just changing out my turbo hot section for quicker spool in the next few weeks - should be fun!
Since this is tangenting off HZ/HD-T, how does the 617 compare with the PZ?
How about a little matrix with the motors from this thread and their max power/torques @ RPM, and your metrics that I haven't yet grok'd? Cheers.
How about a little matrix with the motors from this thread and their max power/torques @ RPM, and your metrics that I haven't yet grok'd? Cheers.
