Duramax FZJ80....The project begins

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Joined
Oct 25, 2007
Threads
8
Messages
80
Location
Perth, Western Australia
Well I haven't posted here in a while so I thought I would share with everyone what I'm doing and in the process document the entire conversion and rebuild.

The project idea and concept arose after returning from a trip early 2010, from the Murchison area in Western Australia and finding that the old petrol 4.5L engine wasn’t up to the task anymore. With the desire for remote outback travel the idea of a turbo diesel wagon was more a necessity than a want.

The new wagon had to meet the following criteria:
1. Turbo Diesel and automatic
2. Must be able to carry 2 adults and 4 kids comfortably
3. Live axles front and rear
4. Coil springs all-round
5. Part time 4wd
6. Easily available spare parts and accessories
7. Fit down any track in Australia
8. Cost no more than $40-45K for a complete touring 4by with all the bells and whistles (could be dreaming)

I started looking at several different options, selling the FZJ80 and buying a HDJ80, finding a HDJ wreck and doing a conversion, upgrading to a TD 100 series and finally the 6.6L Duramax conversion into an 80 Series.

A few Duramax conversions in Patrols had now been completed by this stage and the output figures were very impressive. I managed to get a pretty sweet deal on a new LMM and 6 speed Allison with all accessories so the decision was made to buy a salvage FZJ80 and do a full conversion and rebuild.

In July last year I purchased a 96’ FZJ80 from a salvage auction, as can be seen in the below pic it had front left accident damage, all superficial panel damage, no structural damage.

028.jpg


029.jpg


Now the fun begins…the strip down. The front end was stripped off and engine and trans removed.

037.jpg


Damage was LHS inner and outer guards, radiator support panel, LHS headlight, Lower indicator panel and front left hand edge of bonnet, the bonnet can probably be panel beat straight.

040.jpg
 
Hats off to you saving that Cruiser from the crusher - decades of life left in her for the price of a little body work.

I would think with all the great diesel Cruisers you have access to there in Oz you could have started with something closer to what you wanted, without having to do a conversion, especially considering your ample budget. I'm interested in why you decided to do it the way you are. Not doubting, just curious.
 
Ambitious. I have little to no experience with major conversions like you’re undertaking, but my initial reaction is concern about reliability. I have heard the Duramax is a decent power plant. And I know there are no guarantees even with a new or untouched powertrain. But it seems the more extensive the alteration the greater the potential for complications to arise, especially in the backcountry where the vehicle is typically put to the test. You’re saying others have done the conversion in your area? Have you gotten to know them? How have they fared? Have they used the converted vehicle the same way you plan to?
 
this it's the kind of swap that I like to see .. turbo diesel and gobs of powa .. keep us posted ! I'm not sure that engine will fit in the 80 engine bay .. much more with the size of the rad and intercooler in a duramax platform ..
 
Thanks for the comments, I reply to comments from the top down.

I did consider buying a factory TD cruiser but any factory TD in Australia is iFS which I don't want. Going down the rebuild route I can modify to my personal requirements.

With any conversion from the normal there is potential for unreliability issue, but I believe that with the amount of prior research and without trying to be too creative or take short cuts then reliability shouldn't be a problem.

There is about 5 GU Patrols that already have the duramax/Allison conversion in already, 1 has been in for a couple of years now and there has been no major problem. The radiators and intercoolers are custom made by one of the best in Australia and cooling hasn't been an issue.
 
With all front end panels removed it made removal of the engine, transmission and transfer case as one unit a lot easier.

076.jpg


097.jpg


098.jpg


100.jpg
 
Now with the engine and trans removed it was time to remove the dash and strip the rest of the interior.

103.jpg


110.jpg


Once the dash was remove the ventilation fan, aircon evaporator and heater unit was removed.

Bruce2003.jpg


The intrusion bar was then removed allowing easy removal of the wiring harness.

Bruce2007.jpg
 
keep updating man i have been wondering about the duramax conversion. i love my truck just want more power
 
Here I have the complete engine and body harness in a box, some mods to be completed at a later date.

Bruce2013.jpg


Now that the interior was stripped out I started removing all of the original tar insulation off the floor and firewall. Instead of using the ‘chill and chip’ method I thought I would try the heat and scrape. I started with one 500w lamp but soon found that by using 2 x 500w lamps I could heat a larger area and get through the job a bit quicker.

IMG_4770.jpg


Whilst the A/C evaporator was out I thought it would be a good idea to give it a clean up. As you can see by the pic below there was a fare build up of lint type debris.

0022.jpg


The following pic shows the evaporator removed from the housing. All of the surrounding foam was quite perished so will be replaced before being reinstalled.

0083.jpg


After a clean up with a soft brush and a little degreaser the evaporator was nearly as good as new.

020.jpg
 
I did consider buying a factory TD cruiser but any factory TD in Australia is iFS which I don't want. .

Interesting thread, subscribed. You didnt want an HDJ80/81 with the solid front axle?

Cheers,
Gord
 
Hi Gord, the buy in price for HDJ80 in Australia is still very expensive for what you get. The reason I am going with the duramax conversion is that I still end up with a live front axle but I have a "new" 80 series that is TD for around the same cost as a late model TD 100 series. If I was to purchase an HDJ80 then rebuild it the cost would be alot greater.
Plus I like do to some things differently :grinpimp:
 
Thanks Stevo, to start off with I will be running the standard rear 80 series axles and I will try some Longfields in the front. The truck will be part time due to the Patrol transfer case.
Initially I will be running a fairly stock tune until the engine is run in and everything is proved to be working correctly and without fault. Once that is done I plan on having a talk to Nick at DuramaxTuner.com and get a 5 position switch with 5 different tunes, the all out tune should see an easy 500RWHP on a stock engine.
I will also have at least one tow tune that allows the turbo to act as an engine brake when slowing down with no accelerator input.
 
...
I will also have at least one tow tune that allows the turbo to act as an engine brake when slowing down with no accelerator input.


If you're planning on doing that, I would also recommend a lockup switch on your slushbox's TC, so it doesn't decouple without power in no-throttle situations.
 
The Allison auto I will be using has a TCM so it will be programmed to keep the TC locked in that program when slowing down.
 

Users who are viewing this thread

Back
Top Bottom