gbentink Turbo Upgrade Users Thread (2 Viewers)

[Lumpskie]

Thanks for the feedback, guys. Tor, at Torfab, was the one that mentioned waste gate springs being 14psi vs 18psi. (mistake in my last post) He just have been mistaken. On gas cars, I'm used to an adjustable boost controller being paired with computerized fuel control. I've been reading that there is a mechanical fuel control on the 1HD-T (similar to a cummins "power knob"). Is that typically how you set your air/fuel mixture? The truck still needs to be shipped to me, out here in New Hampshire, so I don't know if the injection pump has a boost compensator on it.

Also, if these are noob questions better suited to another thread, let me know.

Thanks,

 

[IanB]

While you're waiting on your truck to arrive, give this thread a thorough read, and you'll be miles ahead of asking noob questions!

If your truck has the 1HD-T injection pump, which I expect it would but just thought I'd ask as it's not original equipment, you'll have the boost compensator needed to fine tune fuel to match boost.

The Official 1HD-T/FT Fuel Pump Mod Tuning Thread

 

[mudgudgeon]

Have you verified that it is in fact a 1hdt?
The engine number will start with "HD *** " for 1hdt, and "HZ *****" for 1hz.

The thread linked above has all the info you will need and then some.

 

[Lumpskie]

While you're waiting on your truck to arrive, give this thread a thorough read, and you'll be miles ahead of asking noob questions!

If your truck has the 1HD-T injection pump, which I expect it would but just thought I'd ask as it's not original equipment, you'll have the boost compensator needed to fine tune fuel to match boost.

The Official 1HD-T/FT Fuel Pump Mod Tuning Thread

Awesome! I will read this thread by the end of the day tomorrow.

Have you verified that it is in fact a 1hdt?
The engine number will start with "HD *** " for 1hdt, and "HZ *****" for 1hz.

The thread linked above has all the info you will need and then some.

Tor said he did the swap... and it looks like a 1HDT, doesn't it?

 

[Tapage]

it looks like .. but it could be an 1HZ with 1HD-T parts as I said before ..

 

[Lumpskie]

it looks like .. but it could be an 1HZ with 1HD-T parts as I said before ..

Hmmm... I see what you're saying. Where do you look on the block to verify? I can ask for a quick picture before they ship.

 

[Locked79]

Hmmm... I see what you're saying. Where do you look on the block to verify? I can ask for a quick picture before they ship.

L/h side at the rear of the engine.

And yes, it does look like a 1hd, it has the direct injection head on it. Since the 1hz has practically the same block, it could be a hybrid, not that it matters much either way.

 

[IanB]

L/h side at the rear of the engine.
View attachment 1398370

And yes, it does look like a 1hd, it has the direct injection head on it. Since the 1hz has practically the same block, it could be a hybrid, not that it matters much either way.

With a hybrid, are the 1HZ pistons not different, or is the compression ratio difference all due to the head?

 

[Locked79]

With the hybrid, its basically a 1hz block and crank, 1hd pistons, rods, head, injectors, pump and turbo. The block is drilled and tapped for the turbo oil return.

Since the 1hd is direct injection compared to 1hzs indirect, you must run the 1hd pistons which means you also need to use the rods too. And the injectors run at a higher pressure which means a pump swap also.

 

[IanB]

With the hybrid, its basically a 1hz block and crank, 1hd pistons, rods, head, injectors, pump and turbo. The block is drilled and tapped for the turbo oil return.

Since the 1hd is direct injection compared to 1hzs indirect, you must run the 1hd pistons which means you also need to use the rods too. And the injectors run at a higher pressure which means a pump swap also.

Gotcha, so lots more involved than a head/manifolds/turbo/IP swap.

 

[mudgudgeon]

Gotcha, so lots more involved than a head/manifolds/turbo/IP swap.

Yep.
It's more a clone than a hybrid.
You basically use the block and crank and most other stuff is 1hdt specific.
If it has 1hdt rods, pistons, head, IP etc, it is for all intents and purposes a 1hdt, even if it is a clone built on a 1hz block.
You can't really make a hybrid IMO.

@Lumpskie engine number is on the block below the rear intake manifold runners.

I ask if it was verified as it's not uncommon in Australia to have a turbo fitted to a 1hz, then sold as a 1hdt whether by unwitting car dealers or owners, or by unscrupulous sellers.
There's not a lot of difference in appearance to an unitiated eye.
If it's coming from a known reputable vendor then it's probably a non-issue.

 

[Locked79]

It's more a clone than a hybrid.

Correct. I suppose hybrid wasn't the correct word for it.

 

[Lumpskie]

Thanks for the information, you guys. This swap was performed by a reputable shop in Washington State. But, I'll ask for a verification, just in case. I got this picture from the previous owner. I can't see the "HD number" on it. From the shape, can you guys tell if it's a genuine 1HD-T?

 

[IanB]

You can't tell from the outside except for the stamping on the block. If the swap was performed by Torfab, I'm sure it's all in order.

 

[Lumpskie]

You can't tell from the outside except for the stamping on the block. If the swap was performed by Torfab, I'm sure it's all in order.

Yeah, that's who did the swap. Tor told me it was a 1HD-T and had a grunter on it. The rig is all the way across the country from me, so it's hard to get more detailed info right now.

I've almost read the entire tuning thread. Looks like a manual boost controller might be one of my first purchases.

 

[mudgudgeon]

You can't tell from the outside except for the stamping on the block. If the swap was performed by Torfab, I'm sure it's all in order.

1hz and 1hdt have different style injectors. 1hdt injectors are clamped in, 1hz bolt in. You can see the 1hdt injectors and injector hold down clamps in one of the pics above.
Also, the IP has a boost compensator on it (not that that identifies the engine type )

 

[Jan-78FJ40]

Besides the stamp you could tell by looking at the turbo oil return and the bolt for the turbo stay. If they are drilled and tapped into a boss, it's a 1HZ block. The factory return is sharply ground and completely flat around the bolt-hole.

 

[Jan-78FJ40]

1hz and 1hdt have different style injectors. 1hdt injectors are clamped in, 1hz bolt in. You can see the 1hdt injectors and injector hold down clamps in one of the pics above.
Also, the IP has a boost compensator on it (not that that identifies the engine type )

The head is undoubtedly a 1HD head-very different from the 1HZ one. But it could still be bolted to a modified 1HZ block.

 

[IanB]

1hz and 1hdt have different style injectors. 1hdt injectors are clamped in, 1hz bolt in. You can see the 1hdt injectors and injector hold down clamps in one of the pics above.
Also, the IP has a boost compensator on it (not that that identifies the engine type )

I was operating under the assumption that it was at the very least a 1HD-T head/manifolds/injectors, etc. No arguments on anything you've said here though.

 

[mudgudgeon]

The head is undoubtedly a 1HD head-very different from the 1HZ one. But it could still be bolted to a modified 1HZ block.

Yep, true.
Block is essentially the same the crank is the same. About the only difference in the blocks is oil gallery drilled and tapped for turbo oil feed.
The crank cradle is also drilled and tapped for turbo oil return.