About our Turbo kit
The LTG 4×4 turbo kits for the HZJ75, HZJ78, HZJ79 and HZJ105 Series are based on a modified CT26, the factory turbo for 1HDT and 1HD-FT engines.
We have found that this turbocharger compliments the characteristics of the 4.2Li 1HZ engine very well. Combining a fast spool rate with reliable power and substantial torque. This will satisfy customers looking for better towing capability, highway speed and general 4wding applications. Power and Torque increase from around 11000rpm, and Torque peaks at 2000rpm, making it very useable indeed.
Power on demand
The boost is adjustable, by the adjustable rod that connects the wastegate lever to the spring loaded diaphragm. We preset the wastegate from 10 to 12 psi. The turbo will produce 20psi, but that is way too much for the 1HZ engine. 10 to 14 psi with intercooler, will produce a significant amount of extra torque for towing, overtaking on highway, and going up hills.
And this level of boost is well within the limitations of the 1HZ.
The larger exhaust and the intercooler allow the turbo to create more boost without getting extra fuel, ie, if you don’t have those options fitted, to get the same performance, you would have to inject more fuel than without. And it is the fuel that generates the heat, more than the boost pressure, and for engine protection, that is what you want. Greater efficiency, rather than pouring in extra fuel.
The exhaust does it by allowing the hot exhaust gases to expand more quickly, so driving the turbo faster at a lower engine RPM, and the intercooler does it by increasing the number of oxygen molecules as the air temperature is reduced – both improving efficiency.
Cooler, denser air has more oxygen to have a more efficient burn of the fuel… or should I say, more of the fuel is burnt under compression, driving the piston, rather than after the valve opens when the continued burning of the fuel does not help produce power or torque.