My thoughts have been turning to more power, and I am far from convinced that I should do it... but maybe I get a christmas bonus!!

Anyway I have done loads of pricing and looking at (pretty much exclusively Ozzy) 1HZ turbo kits. But then I threw it to one of our suppliers - in Holland, and got back the following after some questions about where the kit came from:

"1) The brand name is Toyota, The kits will be build with original Toyota Parts, (no Australian parts will be used) The offered turbo is a low pressure turbo, the turbo boost isn’t more than 0,55 up to 0,6 bar. It will give an extra 35 HP and additional Torque of 30 – 35%,

2) Without fitting the boost compensator the engine will not run 100% when the turbo isn’t switched on (below 1500-1800 rpm).. The turbo is providing more air/oxygen to the engine, this will gain more power but only when the engine receives more fuel as well. The fuel pump must be adjusted to the need of the turbo. A standard fuel pump is providing more fuel on total the rpm range, but you only need more fuel when the turbo is switched on. Without the boost compensator, the result is incomplete combustion (black exhaust gasses) below 1500-1800rpm.

I have translated this from Dutch, hopefully it is understandable."


Now I am well aware of the risks of turboing etc and for sure would fit a pyrometer and a boost guage. But I have never heard of a 1HZ toyota based turbo kit - can anyone shed any light?
Gil

Hi Gil,

I assume it's All American Imports you are referring to! I know about several 1HZ engines they have turboed, including a few 105's for the Dakkar people. I know one guy personally and he is very happy with the result. I believe the price for the conversion is about Euro 2500,- including installation. I wouldn't doubt their knowledge about this subject. If it is not AAI, then you may refer to them for this.

Cheers
Noel
exploreafrica.web-log.nl

Gil,

I can second that. If it's about AAI, there's no risks involved as Maarten knows his stuff. If it's not, speek to AAI.

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Roman (UK)

Cheers Noel,
the kit was actually offered through an agency, but funnily enough I was just thinking about getting in touch with AAI - they supplied me a longranger tank which is super... Could well be that my contact is sourcing from AAI! In which case they are at least doing me the favour of not adding anything...
Will get in touch with George if I decide to go down this route,
Gil

But I have never heard of a 1HZ toyota based turbo kit

Me neither and you'd think it would have been known about by now, esp in Au. Would not TGS know? Or ask Stefano at Grand Erg - he's been down that road and these days runs a 78 in the Sahara.
Home Page

Ch

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Morocco Overland 4 (2025) • Trans Morocco Trail

Got a mail from All American, and sure enough the kit is from them, and comprises original toyota parts! Priced at Eur 1,600 plus up to 300 for boost compensator. Like Chris I am surprised it is not more known, but then I suppose the Euro tuning market for 1HZ motors is not exactly large! The installation looks very good - they sent some pictures of the kit installed in a 105. Anyway, it will be a project in the New Year as the 78 is no dragster and I was always thinking about it.
Gil

AAI have a solid reputation amongst LC owners as Roman has pointed out. I've been contemplating getting an intercooler for my 80 for some time and their advice on this and other things is spot on.

FWIW

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pigapitcha

http://www.jljphotography.co.uk

While I wait for AAI to get the parts together I have been kicking around ideas of exhaust systems... Those that know the HZJ will know that the system has two 90 degree bends and two muffler sections - big ones!!! Now I have access to various L/C exhaust sections, so was thinking about doing some cutting and bending - in effect creating a straight through system exiting at the side in front of rear near side wheel. Like a big slow caterham!!! I know the turbo will kill quite a lot of exhaust noise, and such a system will reduce back pressure, but I was wondering if the noise will drive me mental or make me feel like an extra 100bhp is available :-) Of course if it doesn't work out I can put the standard system back, but before I get busy with an angle grinder and pipe bender it would be interesting if anyone has experience with straight through exhausts on a turbo diesel?

He Gil,

You can buy these pipes ready made and they do have something of a muffler on it!
Check the site of TourFactory in Germany.

::::::::::Tourfactory - Willkommen auf unserer Website:::::::::::

You can download their brochure. They have other nice stuf as well.

I think AAI might have them too. I have considered such a side pipe too but without turbo, the noise would be a bit to much. But you are right, with turbo it will be ok. If you take away the Toy muffler, then TF offers a nice 120L stainless steel (water) tank to go in that place

Cheers,

Noel

By all means go for a side exit, but as you say the noise will be a problem.

Try to get a reasonable silencer in there and have the exit pointing back and down.

Removing the big main box will enable the turbo to spin up more quickly giving better throttle response.

If you had a good christmas bonus, have you considered an intercooler as well

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Cheers,

Julian Voelcker
Overland Cruisers - Specialising in Land Cruiser preparation and servicing.

From what I've read having a turbo reduces noise slightly but I don't have personal experience (unfortunately). Often the first 'silencer box' is actually a resonator box to kill the sound, not just to control the gases and back pressure.

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Chris
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"Never have a stupid argument with an idiot - he gets a lot more practice than you"
there I go again
not too hard really

Thanks for the exhaust info chaps. I will of course let you know how it goes. The 'tourfactory' site is positively dangerous with some really nice looking kit! I have installed some gauges (real street racer style glowing ones like in a Nova) in preparation - EGT and Boost so as to monitor what goes on as I really don't want to rebuild a motor with less than 10K kilometers on it.
I was able to glean a little bit more feedback on the kit here (strangely in the USA): 1HZ Turbo System Supplier - IH8MUD.com Forum

Only thing I don't like the look of is drilling into the block, so may well end up removing sump pan and taping the return line into there very securely.

Regarding Julian's suggestion of the intercooler I was considering it, but increasingly started thinking more along the lines of 'chemical intercooling' a la rally cars - high pressure water injection system (aquamist for example). Cannot really see any disadvantages as I would not be running it to increase boost, but just to lower temperatures and there would appear to be some quite large advantages over an intercooler. Quite an interesting subject also with apparently some serious consumption reducing aspects or power increases depending how you use it... also relatively cheap and easy to install compared to an intercooler (will start to run out of room under the bonnet soon!)

I know it is all not really strictly overlanding, but my goal is to obtain a decent power output while maintaining low temperatures and reliability. Of course frustratingly things don't go according to plan when dealing with logistics to West Africa... so my eagerly awaited kit languishes under clearing in Accra, hopefully I can post some results post-fitting in the next week or so.

Okay back off to haunt www.streetracingminibusdrivers.com :-)
Gil

Hi,

a lot of the local guys here in SA run turbos on 1HZ motors and they work hard, I think you must seriously consider the intercooler, the drop in EGT is between 50 and 90 degrees which will lessen the strain on the motor considerably.

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Jean Visser

http://ons4.reproroom.com

Well the kit arrived last Sunday so fitting commenced in the afternoon... and continued in the evenings on Monday, Tuesday and Wednesday. The kit is really well put together and everything went together very well. I opted to drop the sump and tap into the sump for the return line which turned out to be a bit of a mission. Got it all finished up except the injection pump modifications and took it for a test run on our 800m airstrip. The turbo was boosting to 0.5 bar no problem, but there was certainly no massive power spike. Next evening tackled the fitting of the boost compensator which is actually a bit tricky - luckily I could call on the help of our best mechanic who is a bit of a whiz on pumps... Yesterday afternoon after final touches we took it to the airfield - with the boost compensator fitted but no fueling adjustments the car was a dog - slower than before turbo fitting. But then we started playing with the fuel! Well what can I say other than praise for AAI... The car is like a different vehicle. Considering there is the weight of sub tank with 180 litres of fuel, twin spare wheel carrier, second battery and fridge plus roof tent up top the car really pulls well. We compared it to a new 79 pickup with no modifications and no load in the back - the 79 didn't stand a chance!
Well satisfied. I am taking the car on a weekend jaunt so will get a chance to monitor temperatures on hills.
Gil

Well done

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Chris
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"Never have a stupid argument with an idiot - he gets a lot more practice than you"
there I go again
not too hard really