How much boost can 1HZ-T handle? (3 Viewers)

[Mitch92]

Is that a adapted 4.5 intake?

Ps. Look at that tiny hole on the barb. I'd be drilling out a bit larger.

Yeah mate it's a 4.5

 

[eddie01]

Part number or details of head stud

Yeah I could see the gasket being an issue. ARPs have worked well for me, but I didnt up the combustion pressure so I really couldnt coment that way. I did up my stud clamp pressure from 87ftlbs to 118ftlbs and I think from memory that increased the clamp load to almost double stock given taht the ARPs camp harder than a normal bolt at the same torque. I chose 118 cus that was the max tensile the ARP stud could handle without yealding and I wanted to be able to reuse them. ARP did make a higher quality stud with greater tensile ratings for many other applications, but mine they only made in the basic strength rating. I didnt notince any increased blow by as I thought I might deform the block. I did break like 5 sockets in the process which was really fun. Especially when I fell on my pressure washer.

Can you please advise part numbers for ARP head studs? I have contacted ARP a number of times with all of the measurements, and they advise there is nothing suitable for 1hz / 1hdt. I cannot locate head studs or high quality bolts to handle a modified engine.
thanks

 

[eddie01]

I am new to the forum and like this thread a few different ideas for the 1hz and 1hdt which I have modified, blown up, and continue to modify.
Just to add in my new intake manifold on a converted 1hz to 1hdt
http://i1363.photobucket.com/albums/r714/GE350/IMG_0281_zpsa1b6d289.jpg

 

[eddie01]

Sorry that was just the porting, finished product
http://i1363.photobucket.com/albums/r714/GE350/IMG_0332_zps9ec04aa1.jpg

 

[eddie01]

and showing the angles in improve air flow from the intercooler
http://i1363.photobucket.com/albums/r714/GE350/IMG_0333_zpsbe2cc2cf.jpg

 

[gbentink]

Looks good Eddie.

On a different note, I dynoed a 1HZ that we are inter cooling and turbocharging this week. Finally, a "before" dyno

Anyway its posted on Gturbo Facebook and made 78.9hp at wheels and is incredibly smokily and rich (14.5: far through midrange and 12.5: 1in high rpms. So, thats a big number for a stock 1HZ, often they are ~ 60-70hp.

Add an intercooler and Gturbo Grunter kit at 16-18psi and we will see what it can do safely at ~20:1 afrs through midrange.

 

[TheBigBoy]

That is a huge number for a stock 1HZ 105 series. Do you know how long the owners been driving it like that for Graeme?

 

[Dougal]

A diesel running richer than stoich. Yikes.

 

[Tapage]

That is a huge number for a stock 1HZ 105 series. Do you know how long the owners been driving it like that for Graeme?

Yup not to open a hole in all pistons with those flying EGT's

 

[TheBigBoy]

I'd love to know his cylinder temps and what his fuel Eco is like

 

[ForealBoreal]

Some XXI 1HZ Turbo Job Reviews... (Not Mine, TheBigBoy's work)

"Just got back from the beach and the cruiser went awesome on the sand, egts around 300 deg when pushing soft sand. When driving to work my fuel economy is 13.5 lts per hundred and after the beach was 16.5 lts per hundred which is slightly better then what I was getting, but s*** loads more power."

Test Info:
3rd gear, 50-60kph, 40k's, held at 18psi boost.

Vehicle info:
XXi WTA Intercooler
XXi Airbox
Gturbo BadBoy (25psi)
XXi upgrade 1HZ pump and injectors
XXi HD Clutch

Truck is tuned to 18:1 afr's for all testing.
EGT's: (post turbo)
Highway 200'c
Suburban 200'c
Can not get egt's higher than MAXIMUM 420'c under any conditions.

 

[ForealBoreal]

Dyno time... XXi 1HZ Project (Not mine, TheBigBoy's work)

Vehicle info:
XXi WTA Intercooler
XXi Airbox
Gturbo BadBoy (23psi)
XXi upgrade 1HZ pump and injectors
XXi HD Clutch

Other Info:
33" mud Terrain Tyres
Standard 4.1 Diff Gears
4th Gear Run 1:1

The Results:
Dyno was performed at the great guys at Bayside Performance Services.

The very first run made 196rwhp/145rwkw and 645nm.
After a few back to back runs it settled down to 186rwhp/138rwkw and 640rwnm.

The AFR's are extremely clean and stable @ 19.5:1 (23psi) at max power. Egt's failed to reach 400'c

Previous stock 1HZ's struggle to reach 40rwkw on this dyno. And although this is a gain of over 200% power/torque. I would easily consider this safe to run day in, day out.

 

[Dougal]

I wouldn't run a 1HZ at 18:1. My Isuzu 4BD1T hits 750C (preturbo) at 20:1.

Post turbo EGT isn't much use. Put the probe far enough post turbo and it'll read ambient. Quoting them as a maximum is completely misleading.

 

[ForealBoreal]

So is there much of a debate between which is better to tune with (Pre turbo EGT vs AFR)?

 

[arnott1t]

I'll soon have a horse in this race so am looking forward to more results. So we want a pre turbo readings to be safe and that means the afr's are safe too correct?

I'm off to snag a 1hz this am...

 

[Dougal]

So is there much of a debate between which is better to tune with (Pre turbo EGT vs AFR)?

Both have to be safe.
But very few people have correct EGT readings.

 

[TheBigBoy]

They are both safe dougal. I tested the difference between pre and post a long time ago, as has Graeme. The difference at 3400rpm 20:1 was 130'c. The highest I've ever seen is 200'c, even then that would be a pre temp of 620'c. The general rule is 100mm from turbo. Pre is always going to be better. But most people here work in post only. So have to give information they can directly relate to. So cylinder temps are safe! We will data log the next project 105 1HZ which tends to blow up a lot more.

 

[arnott1t]

Both have to be safe.
But very few people have correct EGT readings.

So if you have a probe hanging in the middle of exhaust stream pre turbo isn't that all we can do? Any way to double check? Two probes seems silly.

 

[Dougal]

They are both safe dougal. I tested the difference between pre and post a long time ago, as has Graeme. The difference at 3400rpm 20:1 was 130'c. The highest I've ever seen is 200'c, even then that would be a pre temp of 620'c. The general rule is 100mm from turbo. Pre is always going to be better. But most people here work in post only. So have to give information they can directly relate to. So cylinder temps are safe! We will data log the next project 105 1HZ which tends to blow up a lot more.

The temp difference is never fixed. The harder your turbo works, the bigger the difference.
The higher the absolute temperature the bigger the difference.
The higher the pressure drop across the turbo the bigger the difference.
The more your wastegate is open the smaller the difference.

Post turbo is so variable that it's completely useless. Even pre-turbo is has it's problems, but it's a magnitude or so better than post temps.

 

[TheBigBoy]

You should be reading cylinders 1 and 6 on the HZ/DT models anyway. Cylinder temps aren't 750 . I'll post all the data once I've logged it all at the same time.

Meantime, here is a CT26 towing 3.4 tonnes up a hill. And the most I've read 200'c difference. I personally have never seen anywhere near that high.



The Gturbo's are far more efficient.