Boost the performance of your vehicle with a Landcruiser 105 upgrade. At Performance Diesel Intercoolers, we stock a wide range of products for your HZJ105 upgrade. From intercoolers, airboxes, MAP sensor filters to diff ratio crown wheel and pinion sets, there is a product suitable for your requirements.

Intercooling the 1HZ.

For the basic level of upgrade, people have the HZJ105 non turbo engine 40-50kW at wheels and look to bolt on a turbo to double the power (75-80kW at wheels). Next, need to consider an intercooler for power (110-130kW at wheels) as well as to drop EGT.

High combustion temperatures are really the only thing that kills the 1HZ so effort should be made to tune to keep them under control as well as monitor EGT with a gauge or display - PDI have a well price digital display EGT.

We once had the idea that while our front mounts are very good at dropping heat, for low boost levels a small top mount would be sufficient. This was dispelled soon after, as we had this setup on the dyno. It produced less power than with a PDI front mount (due to tuning with air fuel ratios AND a quick check on the outlet temperatures showed it wasn’t doing very much. We would always recommend a front mount with the 1HZ if you ever load it up.

1HDFTE Engine swaps.

Many ways to do this, but doing it right is the important. Installing the engine management system is the part that must be done right for reliability, but deciding what the objectives are very important so the correct parts can be chosen.

We have done this conversion many times and have helped lots to complete their builds with advise and parts. Working out the power objectives or if you will be towing or want auto/manual transmission is a good place to start. Possibly starting with another body is also worth considering for a cost effective build.

The 1HD-FTE from the HDJ100 put down between 105-110kW at the wheels and the same engine from the HDJ79 puts down around90kW at the wheels. The ECU plugs and intake butterfly for the HDJ79 is the same as the 1998 - mid 2002 HDJ100. The later model (mid 2002 - 2006) HDJ100 came with the electronic butterfly and different ECU.

Once modified the HDJ79 and late model HDJ100 will respond the best. The early HDJ100 will typically result the least amount of power (by 20-30kW) so this needs to be taken into account when purchasing and what mods to perform for getting best results.

1HDFTE engine upgrades.

From standard normally the first thing done is a chip/module as it is not possible to reflash or reprogram the ECU.

After this it is to increase boost and consider a upgraded turbo or intercooler. Depending on the intended use you may want to do one before the other or both at the same time.

Engine Swaps.

The most common swap is to install the Toyota factory turbo engines, being 1HD-T, 1HD-FT (from 80 series) and the most popular 1HD-FTE (from the HDJ100 series or HDJ79). The 1HDF-T may pass emissions requirements for the very first of the 105 series, but the 1HD-FTE with electronic fuel pump is the only one that is from the same generation and will pass Department of Transport approvals.

Other conversion options are a V8 diesel, but these deviate from the design too much and will not compare to power output, given money spent to a modified 1HD engine.

There are a range of other conversions that are done including the Barra turbo engine from the Falcon.

1HDFTE Upgrade Limitations

A750 5 speed auto 160kW at wheels with modified valve body - this means standard injectors or maybe +30 if you trust the tuner to control torque to keep it under 600Nm.

A442F 4 speed auto 240kW at wheels with modified valve body. Can also run high flow injectors with this transmission and over 30psi boost. We still think there is more capability on these.

H151 5 speed manual. With standard clutch limited to standard injectors and 25psi boost. With a suitable clutch (NPC 1300Nm) these boxes can handle up to 300kW at the wheels with some reliability. Above this power or if not driven nicely the gearbox will

R151 5 speed manual - if you want to run this box with a turbo engine then you are taking a risk, so drive easy and don’t load up in 5th gear. When upgrading consider finding a H151 replacement.

PDI 6R80 6 speed auto conversion - strong enough to handle the power potential of a fully modified 1HDFTE or turbo 1FZ.

What You Should Know About a Brake Booster

Considering a Landcruiser brake upgrade isn’t a bad idea, especially for off-roading. Indeed, we recommend that every cruiser owner upgrades their brake booster.

• An effective brake booster is a critical component to the braking and appears as a black, circular canister located on the firewall, between the pedal and master cylinder. Together with the master cylinder, it works at stopping the vehicle with less force applied by the driver.

• Brake boosters are available in single and dual diaphragms. Once the driver steps on the pedal it multiplies the force exerted to the main brake cylinder resulting the piston pushing braking fluid through the system. The liquid pressure increases and fluid moves to the slave cylinder at the wheels where it clasps the brake rotors’ pads, slowing down the car.

• PDI brake boosters are larger than factory (and other aftermarket options) so that the force able to be applied on the master cylinder is increase (up to 50% more) so that stopping ability is increased.

• Ultimately, an upgraded PDI brake booster massively changes the results when emergency stopping is required or when the vehicle is fully loaded or running larger diameter tyres. The standard brake booster means the driver would have to apply more pressure to the pedal to try and slow the vehicle down – often not enough assistance is available from the standard booster to achieve satisfactory stopping so driving style needs to change.