Keeping Cool
Intercooling is the most cost-effective and
efficient way of improving the performance of a turbo-diesel.
Nick Dimbleby reports
The company
Allard has been involved with forced induction (turbocharging and
supercharging) since 1959, when its first Land Rover conversion was fitting
a supercharger to a Series II
Throughout the 70s and 80s, Allard was one of the UK's main turbocharging
specialists, working on all sorts of cars, trucks and even mobile homes.
In the early 90s, turbocharging entered the mainstream. As the sales of 4x4s
increased, manufacturers sought to increase the power of their diesel
engines to make the transition from lightweight petrol car to heavy diesel
4x4 less of a shock. Fitting larger intercoolers or coolers to vehicles
which had not previously been intercooled proved even more effective than
had been anticipated.
Turbocharging is Alan Allard's specialist subject. Working with his son
Lloyd, their company, Allard Turbosport, specialises in fitting larger
intercoolers to the complete range of Land Rover diesel engines, offering a
considerable impact on performance and driveability.
The results are incredible; the Land Rover 200/300Tdi engine will produce up
to 22% more power and torque with no increase in boost pressure
after fitting a larger intercooler and refuelling to match the increase in
mass airflow.
But how does fitting a larger intercooler increase the performance of a
turbocharged engine? I drove four very different vehicles fitted with the
Allard Turbosport conversions and spoke to their owners.
| John Howells and Julie James 90 2.5 turbo-diesel |
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90 is used mainly for trialling
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John Howells and Julie James use their blue 90 2.5 turbo-diesel
almost exclusively for trialling.
To maximise the engine's potential, the
turbo-diesel has been fitted with an air to air
intercooler, a modified pump and adjustable boost/fuelling.
Using a control
in the cab, John and Julie can change from 'economy' to 'power' settings
with a flick of a switch something that's very useful for that tricky uphill
climb on the number three gate! |
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Air to Air Intercooler plays a key role in boosting the turbo-diesel |
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| Andrew Graham 90 300 Tdi truck cab
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Andrew Graham with his hot 90
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Looking at Andrew Graham's battered B-reg 90 truck cab, you wouldn't think
it's special but it's a Q-car to give boy racers a run for their money.
Andrew retro-fitted the vehicle's 300Tdi engine and 8380 gearbox from his
older Range Rover, preferring to concentrate on the mechanicals. Eventually,
Andrew intends to change the pick-up body into a full-length hardtop but,
now with a Phase II Allard conversion and the 90 truck cab's light weight,
the vehicle flies along. |
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300 Tdi engine has a Phase II Allard conversion - and it flies! |
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