1HZ-T and 1HD-T

[Radd Cruisers]

The OM617 is a very "sleepy" engine that doesn't really get going until it's on boost. The 1HZ is tuned quite differently and puts out lots of power at idle speeds...

More food for thought.


~John

 

[Tapage]

1HD-T aren't a tiger without boost .. the good thing about 1HD-T it's with proper gearing ( and actually should be the same with any turbo engine ) can move it faster with the well matched CT26 ..

 

[Dougal]

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.

If he's talking computers and wiring then it might be one of the newer 4H series engines like Astr is playing with. The 4B series are all mechanical.

It'll be interesting to hear how you like the smaller turbine housing.

 

[lshobie]

If he's talking computers and wiring then it might be one of the newer 4H series engines like Astr is playing with. The 4B series are all mechanical.

It'll be interesting to hear how you like the smaller turbine housing.

Will be interesting, I expect boost off idle with it. The current housing boosts at about 1600-1800rpm. Since I that truck is mainly a play thing I might as well have that power when I want it. I'll dyno it as well.

 

[Radd Cruisers]

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.

Torque and horsepower numbers are almost totally meaningless for comparing engines. The actual seat of the pants feel is totally different on these engines.

~John

 

[lshobie]

Torque and horsepower numbers are almost totally meaningless for comparing engines. The actual seat of the pants feel is totally different on these engines.

~John

Very true, and factor in driving style, gearing, auto vs manual as well - they all behave differently. The engineers and designers build the jet fighter - but the test pilot decides if it any good.

 

[Dougal]

The OM617 is a very "sleepy" engine that doesn't really get going until it's on boost. The 1HZ is tuned quite differently and puts out lots of power at idle speeds...

More food for thought.


~John

I haven't driven one, but it sounds like the stock turbo doesn't do much down low. It's basically a T3 so there will be other turbos that are close to bolt in as well as the ones which take a lot of custom work.

 

[sandcruiser]

can someone confirm the stock boost numbers on an hd-t?

as far as I can tell, mine has a bone-stock wastegate, but I see over 10psi all the time, closer to 12 uphill.

 

[Radd Cruisers]

can someone confirm the stock boost numbers on an hd-t?

as far as I can tell, mine has a bone-stock wastegate, but I see over 10psi all the time, closer to 12 uphill.

They all vary a little, but about 10 PSI is normal on the 1HDT

The 12HT and 13BT come in at about 0.5 bar - so about 7 - 8 PSI. But some variability is there. They run much more nicely at about 12 PSI when under throttle.


~John

 

[ForealBoreal]

10 psi for me

 

[Notmyrealname]

Hmm very interesting guys i for one love my 1HZ-T

 

[Volcano cruiser]

There is some very good information in these posts. For me I own an HZ and am in the process of turbo charging it. I just got the turbo back from the shop all re-conditioned and balanced and ready to go just waiting on the exhaust manifold to come in. I decided, against the advice of many who said that it wasn't even worth putting on a turbo if it wasn't set between 10 - 14 psi, to set mine at 8 psi. I ran all of the turbo calulators, talked to mechanics and others and thought about what I wanted out of the turbo. 8 seemed right to me and I'm glad to see that others who have tuboed their HZs are right in the same 6-10psi range.

 

[lshobie]

There is no problem running 8 psi at all - will give you lots of power and won't over work the enginetoo much.

 

[Tapage]

can someone confirm the stock boost numbers on an hd-t?

by my max ellery's 9 PSI ..

Edit: but boost it's a relation between load and fuel .. so more fuel and load will put you with more boost ( more EGT too ) with factory set wastegate

 

[Adam B]

a stock 1HDT runs 5-8 or 9 psi max

That's not accurate, from what I've experienced.

Mine was 10.5psi with no mods. I recall a few others here saying similar things a couple of years ago.

 

[lshobie]

That's not accurate, from what I've experienced.

Mine was 10.5psi with no mods. I recall a few others here saying similar things a couple of years ago.

Out of the factory? Hmm, or did someone in Japan turn it up before you got it? I have seen posts or 5-9 psi reported after installing a boost gauge.

 

[Tapage]

Out of the factory? Hmm, or did someone in Japan turn it up before you got it? I have seen posts or 5-9 psi reported after installing a boost gauge.

it can be as a consecuence of age in the wastegate spring .. sound soo logical to me .. when I was 3" with no any other adjust to my wastegate I saw increased PSI more than factory ..

 

[lshobie]

it can be as a consecuence of age in the wastegate spring .. sound soo logical to me .. when I was 3" with no any other adjust to my wastegate I saw increased PSI more than factory ..

Yes that can make sense!

 

[Dougal]

Running the numbers on 1HD-T air consumption with the known fuel injection quantity, 10psi fits nicely.

 

[tourboy]

the 78 series troopy and 79 series ute/pick up that came with the fctry turbo diesel got the 1hd-fte which have electronic control on just about all the motor and get great power figure

The 79's get the 1hd-ft, the wagons get the 1hd-fte with the electronic pump.