1HDFT H151 combo gears?

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AllenTenT

AllenTenT

10 Year 15 Year
Joined
Feb 5, 2006
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33
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South Africa
Hey Dieselheads, I would lke to see what gears other 1HDFT H151 5spd are running on the 80, I have a Jap spec with 4.1 and Im running 285/75/16 , I know different markets had different gear specs, Id like to get my revs down and dont think moving to 34in tyres will do enough, at 120KMPH Im almost on 3000 revs and I have enough power to play with, tks, Al
 
The less gearing that I seen in 1HD-FTE powered cruisers are 4.11 if we are talking about 100 series IFS I thought you have no other ioption than 4.11 most thinking in your front 3rd member ..

I'm not sure if you can found a 3.70 for 8" front diff HP if we are talking about 80 series or 105 series ..

Anycase here we have some 100 series with 4.30 which means more reduction ..

The best way it's more tire size :D
 
"The best way it's more tire size"
:D
Well this is where my mind is at at the mo, thing is I do long distance with my truck and 35" is the limit, I wonder how it all works out with revs, from where I am now how will 35" with 4.1 compare to 33" with 3.7 , I havent figured the maths yet.
 
I have HZJ80, with factory H150F tranny,with 315/75/16 BFG Muds, and the standard 4.1:1 diff gears. i think i have calculated that @ 100km/h, the engine is revving at 2270rpm. Hope that helps in some way
 
So does the H150F and H151F have the same ratios?

You seem to be doing well with that 1HZ
 
The H150 has a shorter 5th gear ratio, the 151 has a higher ratio (from memory) as it came behind the 1HD/1HDFT, which has more power/torque than the 1HZ.

Doing well with my 1HZ?? In what way, im lost:o
 
Well you seem to be on a successful quest to get more power torque out of it.
 
In my book both trannys H150 and H151 have the same final ratios and reverse .. only change in 1st and 2nd shifts.

The H150 ( 1HZ) have 4.529 and the H151 have 4.081
 
Tapage,
Yes, i checked, you are right. i knew at least one of the ratios was different. i just checked my book, should have done it before i posted!:doh:

AllenTenT,
Yeah the power is quite adequate for the moment. The truck weighs around 2,700kg (5,900lbs) empty, and it has no problem sitting on 120km/h in 5th, no matter what hills you come across on the freeway. i will up the boost one day to around 13-14psi, but the turbo (mitsubishi TD05H) may become fairly inefficient at this stage, and just pump hot air. In a couple of years a will replace the 1HZ with a 1HDFTE from a 79 series ute, put a Dtronic ECU chip in it, rebuild the turbo with Garrett cartridge, and hopefully run ~20psi, as i allready have the intercooler and exhaust in place. Will just have to modify the pipes to suit the 1HD.

What sort of power are you making with your setup ? Fuel usage?

Phill
 
Both my rigs are pushing 3000 RPM @ 120 KPH ... very frustrating on long trips.

HTH:

1HD-T 4.88 gears H150F tranny 37" tires

1HZ-T Intercooler 4.30 gears R151F tranny 33" tires
 
Last edited:
Big80
1HDFTE upgrade sounds interesting, you lucky you have that option available, here the 70 series only came with 1HZ, 1HDFTE motors only came in the 100 VX which sells for $130000aus equivalent, so not too many lying around

I had my truck on the dyno recently and got 110kw and 380NM at the wheels EGT 700, honestly I expected a bit more
Fuel use: I have been battling a bit to get it the way I feel it should be, I filled up yesterday and got 8.5 km/l which is combined town/ highway driving, Im sure I could get about 9.5km/l open road but need to keep the revs around 2600rpm

I know other 80 owners with similar setups getting very good consumption with auto box, so far Ive done tappets checked the injectors, running synthetics. My pump had been fiddled buy the PO though so not a stock starting point. Ive considered getting it checked out but havent found anyone I trust yet, its easy to pay alot and be in no better position here.
 
Is that 110kw @ all 4 wheels, or do you have a part time kit in it? If 11o at all 4, thats a fairly good output, would equate to around 135-145rwkw, which would be an easy 165-180kw @ flywheel. I think mine would be close to 150kw @ flywheel, maybe a bit more. I currently use about 12.5-13L/100km, depending on conditions

Phill
 
Uhuru
We have the same problem but with with different config, you prolly need 4.1 with those 37"s , 37's are a bit extreme for my use I been through some crazy stuff with 33"s so I cant really relate, I think 37's might need a whole bunch of other stuff to be upgraded
Im in the process of a suspension redesign and am planning around 35's, Im also weary of the low end gearing when off road, Im sure the answer is a slightly longer 5th gear in the H151 , I really dont get what Mr Toy was thinking here I had plenty 5th gear power even before my IC upgrade
 
Phil
Yup its at all 4 no part time on my truck, I like the way it is, its just that 5th gear that drives me mad, Im thinking improving the air coming in now, snorkel would be good. Its on my list but that list is sooo long.
 
Thats a good effort then!
In regards to gaining a taller 5th gear,the 5th gear in the H150/H151 gearboxes is right in the middle, the gear doesn't come off the laygear so it's not changeable, even if parts were available.

So maybe a custom (expensive) gearset is the only way??

Might see if i can find some info on the new 1VDFTV equipped H150/151 70 series trucks. Surely thay would have a taller 5th gear!!
 
Phill
"Might see if i can find some info on the new 1VDFTV equipped H150/151 70 series trucks. Surely thay would have a taller 5th gear"

Are you talking about the new V8, thats a good point you have there Im dead eager to see if they have done anything with the H150/151 ratios for this motor, we dont have the new 70 series as yet

Id love to see what the full power potential of the new V8 would be ,specs I have seen are only on 70 series but im sure it will be upspec on the new 200
Imagine that in my 80 :D

Al
 
Yeah we have them at the moment. Will test drive a ute in the coming weeks ans let you know how it goes. it would be the ultimate motor in an 80 series. I didnt have any luck finding the g/box ratios, but did read that the diff ratio has changed from 4.1:1 to 3.9:1, so Toyota may not have changed the ratios. Although they have strengthend the box, so who knows. time will tell i spose!

The single turbo 1VD as found in the new 70 series has 151kw @ 3200rpm, and 430nm @ 1200-3000rpm (brilliant torque curve!), the twin turbo version that will be seen in the 130/200 series (or whatever they are going to call it) is going to have 220kw and 650nm (s*** yes!)
 
220kw and 650nm (**** yes!)

Now this is going to spend alot of time buzzing around in my head

Im sure it wont be easy to get your hands on one, somewhere in the future
 
-uhuru- said:
Both my rigs are pushing 3000 RPM @ 120 KPH ... very frustrating on long trips.

HTH:

1HD-T 4.88 gears H150F tranny 37" tires
Click to expand...

You want to go faster in your 80 .. ? naaaaa

-uhuru- said:
1HZ-T Intercooler 4.30 gears R151F tranny 33" tires
Click to expand...

Easy solution .. go with 35" ( 315 ) :D :idea:

big80 said:
luck finding the g/box ratios, but did read that the diff ratio has changed from 4.1:1 to 3.9:1,
Click to expand...

Interesting to know with all this power if they will keep the 4.11 gear for all 7* series with the new V8

big80 said:
The single turbo 1VD as found in the new 70 series has 151kw @ 3200rpm, and 430nm @ 1200-3000rpm (brilliant torque curve!), the twin turbo version that will be seen in the 130/200 series (or whatever they are going to call it) is going to have 220kw and 650nm (s*** yes!)
Click to expand...

Not brillinad at all if you check the PDF spec at the Toyota Au site that show you have the max HP @3400 rpm .. but the torque curve from 1200 to 3200 rpm .. :eek:

Anycase I thought the V8 in the 76 it's the twin turbo no . ?
 
No, the 70 series only comes with the single turbo version.
 
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