Adding turbo to 1HZ

Submitted: Tuesday, Apr 07, 2009 at 23:24
ThreadID: 67670 Views:3463 Replies:9 FollowUps:3
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Hi all,

As the funds do not stretch to a later model I am doing the maths on a turbo for the old 1HZ in a 75 series. With a camper on the back the engine had enough oomph for us but as we are now looking to drag a caravan around it might struggle a bit.I know the exhaust will need upgrading probably to 2 1/2 inch but has anyone found any necessesity to upgrade the air cleaner to a larger volume unit. Obviously the engine will be taking bigger breaths and I am concerned that the stock (non turbo) cleaner may restrict airflow thereby raising the vacuum at the inlet and possibly drawing oil from the turbo into the air stream if the filter becomes even slightly blocked. Yes I know even a non turbo engine needs the filter replaced or cleaned more often in dusty conditions but the larger the air requirements the sooner the cleaning becomes needed. If you see what I am rambling on about?
Thanks in advance

Cheers Pop
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Reply By: philldeb - Wednesday, Apr 08, 2009 at 04:29

Wednesday, Apr 08, 2009 at 04:29
The 1hd-fte uses the same air cleaner as the 1hz
AnswerID: 358728

Reply By: - Wednesday, Apr 08, 2009 at 05:28

Wednesday, Apr 08, 2009 at 05:28
G'day all, the volume of air intake per cylinder doesn't increase much (just compresses marginally) but it (the air) gets there a lot quicker with the turbo! A snorkel helps with a ram effect & cooler air as well. A large intercooler would help as well, but really not worth the trouble & really nowhere to put it on one of these relativly slow revving engines. whilst driving you can feel the turbo kick in. I have an aftermarket turbo on my 1HZ in a 3.5 tonne troopy campervan, seee yaa, aussiedingo
AnswerID: 358733

Reply By: guzzi - Wednesday, Apr 08, 2009 at 06:33

Wednesday, Apr 08, 2009 at 06:33
There are 2 very distinct schoosl of thought on turbo'ing a 1 HZ.

1. Is the dont do it, the 1 hz isnt built for it and it WILL blow up

2. Turbo it ,intercool it and keep the boost no higher than 9 psi and the temps under 550deg C.

The weak point appears to be the pre combustion chambers in the head cracking and piston longevity at high boost levels.

With a turbo 3in exhaust seems to be the preferred option.

Have a read of the 2 web sites below, they pretty well cover the 1 hz and turbos in the different models.


AnswerID: 358735

Reply By: Member - Phil G (SA) - Wednesday, Apr 08, 2009 at 08:21

Wednesday, Apr 08, 2009 at 08:21
The other issue you face is cooling. Because there is limited underbonnet space and small radiator, the 75series often overheat when you add a turbo (80/105 series don't usually).
AnswerID: 358743

Reply By: Mobi Condo - Wednesday, Apr 08, 2009 at 08:44

Wednesday, Apr 08, 2009 at 08:44
G'day Pop,
For what this is worth! Our 80 series 1HZ got a turbo at around 240,000 k. We tow heavy (approx 6.5 t all up with van and tug) and we have had a good result. Not just with power increase (1 - 1.5 gear better on same hills, same rig before and after), but also better economy (around 10%).
We use the same air cleaner as standard. There was a larger exhaust fitted as well - 2 1/2 inch!
Cheers - Mobi
AnswerID: 358749

Reply By: Rossco td105 - Wednesday, Apr 08, 2009 at 10:27

Wednesday, Apr 08, 2009 at 10:27

Not sure if the 75 series air box is the same, but I do know that the filter element out of the V8 100 series is quite a bit bigger in circumference than the stock item. I use one in mine, HZJ105 (I wanted to maintain a 'paper' style element). Fits straight in no problem at all. Hope this helps.


AnswerID: 358766

Reply By: Drew - Karratha - Wednesday, Apr 08, 2009 at 10:29

Wednesday, Apr 08, 2009 at 10:29
Have you thought about Diesel Gas instead of the turbo?? I am currently considering getting a Diesel Gas Technologies system fitted to my 80 series 1HZ with 410000k's on it - but want to be sure that the k's on the motor arent too high...
AnswerID: 358768

Follow Up By: Horacehighroller - Wednesday, Apr 08, 2009 at 11:38

Wednesday, Apr 08, 2009 at 11:38
Hi Drew,

If you do go ahead with the gas please post your pinions here after some thousands of Kms.

I'm interested too.

FollowupID: 626798

Reply By: Bushed-Tracker - Wednesday, Apr 08, 2009 at 19:06

Wednesday, Apr 08, 2009 at 19:06
I have a 100 series std 2000 model with the 1HZ motor. It was fitted with a DTS turbo at around 30,000 k by previous owner who also fitted snorkel and a lot of other goodlies. We tow a Bushtracker loaded to max legal 3.5t.

It has now done 200,000 towing a Bushtracker all its life. Uses no oil and sweet as a bird - but a bit pedestrian and towing at 20L/100 we have no complaints.

AnswerID: 358851

Reply By: Member - Redfive - Wednesday, Apr 08, 2009 at 20:28

Wednesday, Apr 08, 2009 at 20:28
Hi Pop

Just finshed fitting a Denco Turbo and Intercooler system to my Troopy 2002 78 series
i must say it worth every cent it has made it into a new truck up my test hill it was 3rd gear 60kph now it 5th gear 100kph 2gears higher and 40kph faster gos like a cut cat
The Denco boys say the Intercooler adds about 20% give or take on there system no Intercooler max boost is 7psi Intercooled is 12psi and drops the inlet temp by 49% and they say dont go over 500 deg c and i did it cause i can i just wanted the same permformance as a factory turbo without the electics im not into carpet ,power windows ,central locking,electonic injection and with the Denco setup you get more power than the factory one anyway and it still works out cheaper cause the factory turbo cost about $10 grand more and i did a fuel check im getting about 11.5 to 12.5 lts per 100 on the highway in 4wd it still getting about 15lts per 100 but the old girl does weight nearly 3 tons so im ok with that and then i tow the camper it makes the whole world a better place lol so i would do your homework and check out all the option i choose Denco cause my mate Paul has been fitting them for mmmm about 10 years maybe more without any worrys
they have a website so check them out

AnswerID: 358859

Follow Up By: Krakka - Thursday, Apr 09, 2009 at 06:11

Thursday, Apr 09, 2009 at 06:11
Howdy Glenn, Do you have an EGT Guage fitted? I had a Denco turbo fitted to my standard 100s last year without intercooler. Huge improvement in performance but I can get to 500 deg pretty easily and have to back off. Do you you know what your exhaust temp is?


FollowupID: 626891

Follow Up By: Member - Redfive - Thursday, Apr 09, 2009 at 13:34

Thursday, Apr 09, 2009 at 13:34
Hi Krakka

Got VDO EGT and Boost gauges fitted my Troopy get to 490 deg c and 12 psi boost if your getting over 500 deg c you need to back the fuel off a bit remember more fuel more heat also you need fuel to get boost but it will only make max fuel on max boost at 100 kph it sits on about 220 degs and 6 psi boost
hope this helps

FollowupID: 626959

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