How much do you push your 1HD-FTE ?

[David*BJ70]

Since 2019, I’ve owned a 1999 HDJ100 with 420,000 km on the odometer, equipped with the A442F transmission. It’s running very well. No oil consumption, no blow-by, in short, everything you could hope for from a 1HD-FTE engine.

My HDJ100 is my expedition vehicle, and it is loaded to a total weight of approximately 3,500 kg (7,700 lbs) (a bit too much, yes, I know). My average fuel consumption during overland trips is between 13 and 13.5 L/100 km (18.1 - 17.4 US MPG). I drive up to 15,000 km per year.

I have installed an EGT gauge as well as an OBD11 reader with the Torque app, which allows me, among other things, to monitor turbo boost pressure.

I’ve always tended to be very gentle with my 1HD-FTE. On the highway, I generally cruise at 2,200 rpm (approximately 104 km/h). I try to avoid unnecessary downshifts (kick-downs) from the transmission whenever possible. When boost reaches 12.4-12.7 psi (0.87 bar), I ease off the throttle and, whenever possible, avoid seeing EGTs reach 650°C (1,200°F).

Am I being too conservative? How do you treat your 1HD-FTE? Do you push it harder than I do? Much harder?

I’m planning to get rid of my rooftop tent and interior set-up and purchase an expedition trailer instead, transferring most of the weight into the trailer. My HDJ100 would then weigh around 3,000 kg (6,600 lbs). My target trailer weight (with brakes) would be between 1,500 kg and 2,000 kg (3,500 lbs and 4,500 lbs).

I know the 1HD-FTE is probably the best diesel engine Toyota has ever built. According to YouTube, I know that plenty of Australians run heavy overland setups and tow large trailers with them. I know, I know...

That said, I'd be interested in hearing about your personal limits and seeing some real-world data. What boost pressures, EGTs, weights, fuel economy figures, and mileage are you seeing? What thresholds are you comfortable with, and why?

**Owners of 1HD-powered Land Cruisers, please feel free to chime in as well, as the engines are quite similar.**

 

[Hulsty]

I have a 5spd HDJ100, recently did a 10,000km trip weighing ~3600kg, also averaged 13L/100 with 34''s tyres. Stock tune but with ~15psi boost (just under boost cut). I do not monitor anything (egt, boost etc) that is not on the factory dash cluster and drive it without worry. I trust the factroy tune and protections, the computer does pull fuel if the water temp rises to high.

Even if I had the gauges, I wouldnt be backing off for boost or EGT, more boost is a benefit anyway, plenty of guys run 25+ psi boost and run egts to 750c pre turbo.

 

[David*BJ70]

I should also mention that EGR systems is deleted

 

[Workhorse]

Hi David! How're you?

I think you're being pretty conservative with your set up even with the weight. You could push it more if you wanted to without issue. I have set the cruise control on mine at 120kph and run it all day long on road trips (5-600F on EGT). Going up and over high mountain passes in Colorado it does really well. I don't push mine as much as it probably could be pushed but it will do 100kph up to Eisenhower Tunnel which is 6+% grades 11,500ft (3400m) in 4th gear. (I have an H152 manual in mine) and sits below 1100F on the EGT gage and 18-ish PSI (I have a Gturbo red wheel set to 221PSI with a Safari Intercooler).

I too swapped from bringing everything but the kitchen sink in the truck to a teardrop. Much better. Less stuff crammed into the 100 and is more comfy overall.

 

[bj70bc]

People report that the ihdt variants can be pushed over 1200f without issue.... how far and for how long is the question. Without 20+ psi and fuel mods i havent heard of issues

Is that a rhd or lhd hdj100?

 

[David*BJ70]

People report that the ihdt variants can be pushed over 1200f without issue.... how far and for how long is the question. Without 20+ psi and fuel mods i havent heard of issues

Is that a rhd or lhd hdj100?

LHD

 

[bj70bc]

If you know of another one of those for sale let me know, thats on my list of must buy trucks

 

[Dougal]

People report that the ihdt variants can be pushed over 1200f without issue.... how far and for how long is the question. Without 20+ psi and fuel mods i havent heard of issues

Is that a rhd or lhd hdj100?

200hp from a 4.2L direction injection engine isn't anywhere near high stress. Gturbo were getting 1000Nm from them years ago.

 

[mudgudgeon]

You're unnecessarily wrapping it in cotton wool.

I had a 1hdt powered 80.
I pushed it to 750-800⁰c egt on the regular. Occasionally I would see 900⁰c
I was running at around 18psi boost.
As for revs, a diesel is happy to rev. They are a slow revving engine compared to a gas engine, but that doesn't mean don't rev them.

Your engine is much happier being dropped down a gear and revving harder on a hill than it ever will be being labored and limped over a hill. If I was losing speed on a hill 2200rpm (2000 at the latest) is about the point I would down shift to keep the revs up in the middle of the power band. Drop lower than that, you're starting to labour it unnecessarily

I found mine happy running at 26-2700rpm. It's noisy, but happy
Above that, I reckon they start to gulp fuel.
I had no hesitation pushing mine to the high 3000rpm rev range. Redline is at 4500 for a reason

There was a long time member of the LCOOL forum who reported driving his at 160km/hr for hours on end across Northern Territory desert highways. He saw EGTs of 850⁰, and when he stopped at a service station, the exhaust and manifold were glowing red. That vehicle was a long term vehicle for that member, and had no issues with that scenario

 

[SNLC]

People report that the ihdt variants can be pushed over 1200f without issue.... how far and for how long is the question. Without 20+ psi and fuel mods i havent heard of issues

Is that a rhd or lhd hdj100?

No it is not a question. Heat melts aluminum, pistons are aluminum. EGTs, watching them, co trolling them is all about not melting your pistons.

Peak EGTs and sustained EGTs are two different things as well.

Cheers

 

[SNLC]

We have pushed these engine to well over 300hp and 600ftlbs. The Aussies have been doing this for years so we are just following their lead.

You can easily push a 1HDFTe real hard. Our next build we are running a UFI turbo with up to 35psi, +50 injectors and a Unichip.

The original poster, you transmission is the weak link in your power train. We don’t push the automatics to hard, 250hp is about the limit we like to push through them with out building the auto for more power.

You can actually fit the 6spd auto from VDJ200’s behind the 1HDFTE, it takes the power no problem.

Cheers