What can we offer for a standard HDI 90?
When quoting power figures it is important to reference the torque output and the engine speed at which peak power is obtained. The reasons for this are that brake horsepower is a product of torque and RPM. Hence if an engine is revving really high it is likely to produce more power. This however is not good for a diesel engine. So the maximum power must be kept within the happy operating range of the engine.
It was found that a standard HDI engine with 100k miles had a peak torque of 215.8Nm at 2225RPM. The peak BHP was 87.5 at 3205RPM.
Through months of extensive testing with close respect to the exhaust gas temperatures it was found that the safe amount of power that could be obtained from a 2.0 non inter-cooled HDI engine was 125.3BHP at 3695 RPM. The peak torque figure increased to 274.6Nm at 2135RPM.
These test results were obtained with the standard induction set-up and the catalytic converter still in place.
For further benefits many HDI owners remove the catalytic converter from the exhaust. This is not necessary to pass the MOT test, as diesel cars are tested purely on smoke density, not the exhaust gas composition.
How do we achieve this?
The main power increase comes from an increased amount of fuelling when the accelerator pedal is fully depressed. Alongside this the injection timing is optimised to match the altered quantity of fuel. There will also be a small increase in fuel pressure. The benefit of this is that the fuel will be atomised more, meaning it can burn more effectively. Unlike many other companies we do not increase the fuel pressure excessively, and yield the extra power from the aforementioned factors.
Many inexperienced tuners will tell you that they will increase the turbo pressure. Unfortunately on the HDI 90 engine there is no electronic control of the turbo wastegate. The wastegate is mechanically controlled. As standard the turbo pressure will only reach 14psi as there is not a great enough mass flow rate of exhaust gasses to exceed this. With a stage 1 remap the turbo pressure will rise to approximately 16 psi until the limit of the wastegate setting is reached.
See Pricing information here!
What can we offer for 110BHP models and intercooled HDI 90s?
With the added benefit of an intercooler it is possible to increase turbo pressure whilst keeping intake temperatures safe. This then means that more fuel can be burnt, resulting in a greater power output.
Typically an intercooled HDI engine can produce in excess of 150 BHP.
For larger power outputs extra modifications such as an uprated fuel pump, or higher flowing injector nozzles can be added along with a larger turbo.
