1HD-T power band

[gowyn]

Does anyone know what rpm/gear the 1HD-T makes best power for towing?

I understand that I should tow with OD off but at 100kph isn't that at the top of the power band?

[harveya]

Peak torque is around 1800 - 2000 rpm on the 1HD-T and peak power is around 3500 rpm.

[crushers]

max power is 165 ps at 3600 rpm and max torque is 37kgm at 2000 rpm, just like harveya said...

[stumpy]

sounds a lot like the F series!

i still wish there were piles of H motors laying in the weeds throughout the US...

[gowyn]

thanks for the info. So I should be fine running highway speeds at 3000rpm towing?

any idea how much that will affect fuel consumption?

[crushers]

the higher the rpm the lower the fuel milage... maybe drive 90 k?

[nickw]

How much wieght are you planning on towing?
And for how long? And over what type of terrain (flat? mountains?).

Personally, I would not run my 1HD-T at 3000 rpm for any longer than I had to.
Diesel's don't like being reved high for a long time.
Use the gearing and torque of a diesel.
I would use the overdrive and run your normal 2200 or so.

Cheers,
Nick

[gowyn]

trailer gvrw 4500#, S. Ontario

I'll experiment.

My Landrover diesel will run all day, flat out.

[crushers]

you are still 1500 rpm under max at 3000....

[nickw]

Originally Posted by crushers

you are still 1500 rpm under max at 3000....

That my be true, but persoanally I would still not want to run those RPM's all day.

Cheers,
Nick

[brownbear]

Higher RPM tho breaths better, less EGTS. holding an overdrive on a hill at 2000rpm with lots of foot into it will be hotter than running it at 3k. Like Wayne said drive slower if fuel economy is wanted. 90 kph Hard across Alberta tho. Southern Alberta is like a wasteland, flat and boring. But fuel is cheap(there) so you can speed across it

[kim]

Originally Posted by gowyn

thanks for the info. So I should be fine running highway speeds at 3000rpm towing?

any idea how much that will affect fuel consumption?

I towed around 5500 pounds across Canada with an HJ60, standard, and averaged 14mpg. With the truck alone I get 26mpg. I think halving your usual milage is a decent rule of thumb when you are pulling over 4000 lbs.

[crushers]

ROTFLMAO!!

i drove a FJ45 from Edmonton back down to Calgary a few years back... what a relaxing drive. you really learn to appreciate that you are missing NOTHING if you drive 140 on that road....

[brownbear]

Originally Posted by crushers

ROTFLMAO!!

i drove a FJ45 from Edmonton back down to Calgary a few years back... what a relaxing drive. you really learn to appreciate that you are missing NOTHING if you drive 140 on that road....

Thats an express way thru there.

I was more refering to the drive from Calgary on the #1 to the sask boarder.

Do it at night. Sask is even more entertaining.

Worst part when you come from the East, you hit the boarder going into Alberta and think WOW we got some neat stuff coming up, there are some big sand hills and the roads curves a bit..... You get mountain crazy. But then you realize there is nothing for about 5 more hours.......

[Tapage]

Originally Posted by brownbear

Higher RPM tho breaths better, less EGTS. holding an overdrive on a hill at 2000rpm with lots of foot into it will be hotter than running it at 3k.

exactly .. !

[Technikev]

I was always under the impression that for driving loaded (with a load, not under the influence ;-) ), the best RPM to run is about the torque peak.

-kevin

[brownbear]

Originally Posted by Technikev

I was always under the impression that for driving loaded (with a load, not under the influence ;-) ), the best RPM to run is about the torque peak.

-kevin

I know what you mean. But what is the torque at on a 3B? I thought it was pretty low, like 1800- or 2000. Can't remember.

If I was loaded on a hill and lugging it at that rpm the temps get really high. If I downshift and rev it a little, say 3000. then it cools right off.

Sure I am over the torque peak(rpm) but I don't think that the torque peak and egts are related. It all has to do with what load is on the engine at that torque peak. This would make a good dyno test. add resistance and have to downshift and monitor egts.......

[Tapage]

Originally Posted by brownbear

I know what you mean. But what is the torque at on a 3B? I thought it was pretty low, like 1800- or 2000. Can't remember.

2200 in B - 2B and 13B-T

[nickw]

There is a dyno of the 3B on this page:
http://www.axtturbo.com.au/toy3B.html

Cheers,
Nick

[Martin White]

I think you're going to be very unhappy with your fuel economy running at 3000rpm on your diesel all day. It would be interesting to compare what you'd get doing that with going with something larger (domestic - gasp) that might be working far less hard for the same speed. I've posted elsewhere that I've found my 1HDT is very sensitive to RPM with respect to fuel consumption.

[crushers]

my 7.3 powersmoke gets 28 mpg at 100 km/hr, no trailer
when pulling a 8000# load it drops to 15 mpg.
there is a reason why i went with a large unit for pulling my trailer.

cheers

[Martin White]

Thanks Wayne. It is good to get this kind of information. That is a drastic drop towing a trailer. But good economy unladen! I'm impressed, that's about 10% better than I'm getting with my 81 on the highway!

[panamacruiser]

hey have you ever considered loosing the full time 4wd? switch to manual lock hubs and you'll get a far better fuel economy I own a 1995 hdj80, 1hd-t, automatic, dual fuel tanks and it came with manual locking hubs and it is a vx not a gx model

[panamacruiser]

believe me having those wheels engaged all the time will tax on your fuel

[Tapage]

Originally Posted by panamacruiser

hey have you ever considered loosing the full time 4wd? switch to manual lock hubs and you'll get a far better fuel economy I own a 1995 hdj80, 1hd-t, automatic, dual fuel tanks and it came with manual locking hubs and it is a vx not a gx model

Hey dude .. how are you ..

I'm also in Panamá and also have a HDJ-80 H442 dual AC dual tanks .. etc ..

check our site .. if you don't know about us ..

http://www.4x4panama.com and our forum .. .

cu dude .. !

[wussyPup]

Originally Posted by gowyn

Does anyone know what rpm/gear the 1HD-T makes best power for towing?

I understand that I should tow with OD off but at 100kph isn't that at the top of the power band?

Some related questions when towing with 1HD-T and A442F auto-trans...

1. When pulling a load up long hillls, what engine speeds are harder on an auto tranny? i.e. keep it in D at 2200 or downshift to 3?
2. Same situation as above, but now what is the effect on ATF temperature of driving in D at 2200 RPM compared to downshifting to 3?
3. When the AT temperature warning light comes on, what is the best way to cool the AT?

Thanks, -Steve

[Greg_B]

Originally Posted by wussyPup

Some related questions when towing with 1HD-T and A442F auto-trans...

1. When pulling a load up long hillls, what engine speeds are harder on an auto tranny? i.e. keep it in D at 2200 or downshift to 3?
2. Same situation as above, but now what is the effect on ATF temperature of driving in D at 2200 RPM compared to downshifting to 3?
3. When the AT temperature warning light comes on, what is the best way to cool the AT?

Thanks, -Steve

Hi Steve. This might be best posted over to the 80 board, if not already done so. Also, check out the 3FE list at birfield.com. Rodney, from Wholesale automatics in Oz has many posts there talking about transmissions, heat, and how to work around. There is a weath of information there as well from other posters, talking about the LandCruiser auto trannsmissions.

hth's

gb

[Tapage]

Originally Posted by wussyPup

Some related questions when towing with 1HD-T and A442F auto-trans...

1. When pulling a load up long hillls, what engine speeds are harder on an auto tranny? i.e. keep it in D at 2200 or downshift to 3?
2. Same situation as above, but now what is the effect on ATF temperature of driving in D at 2200 RPM compared to downshifting to 3?
3. When the AT temperature warning light comes on, what is the best way to cool the AT?

Thanks, -Steve

Steve ..

IMOP and IMexperience .. with 1HD-T and H442F auto tranny .. keep it as fresh as you can..

In a long uphill O/D off is allways your rule .. if you heva your shifter points adjusted soo soft .. manual shift maybe is a good idea ..

I target are keep your tranny freash .. if you are pulling or running your tranny with much sleepery you gotta melt it ..

[panamacruiser]

I've ran my 1HD-T to a max of 180kphr and have no trouble with it. I did it for about an hour and a half! But towing, that's another story

[panamacruiser]

Originally Posted by wussyPup

Some related questions when towing with 1HD-T and A442F auto-trans...

1. When pulling a load up long hillls, what engine speeds are harder on an auto tranny? i.e. keep it in D at 2200 or downshift to 3?
2. Same situation as above, but now what is the effect on ATF temperature of driving in D at 2200 RPM compared to downshifting to 3?
3. When the AT temperature warning light comes on, what is the best way to cool the AT?

Thanks, -Steve

1. It all depends on your load
2. The higher the revs the harder on the tranny
3. Stop and shift to park(idling) until the light goes out