Taken from a recent addition of Australian "4WD Monthly".
Following article written by Greg Brindly
Bias aside, in the 'forced induction' stakes and with turbo charging
having the runs on the board, finding good reason for consideration of anything
else is difficult. Indeed, to an extent it's frivolous mentioning 'super'
and turbo in the same breath due to the superiority of 'exhaust induction'
in most applications.
And who better to seek information from that AXT Turbo's Daryl Aston.
By calling on both his and the vast experience of his staff and their many
years of designing and manufacturing of quality turbo systems, the company
have and continue to excel in the specialist area of specific turbocharger
packages to fit only diesel engines, more often that not for 4WD vehicles.
In turn, working at the coal front as a manufacturer, Daryl is acutely aware
of the demands and quality requirements of turbo charging equipment and is
proud to suggest that reliability is, when cared for in an appropriate manner,
of the highest standard. He is also proud of the companies' 95% local content
Perhaps more pertinent than AXT Turbo's success though, is the ability
to dispel the old wives tale suggesting turbochargers suffer from inefficiencies
including lag and excessive under bonnet heat. Indeed, for turbo diesel applications,
AXT design kits which emphasise the main attributes of diesel engineering,
mean torque - bags of it. Thanks to articulate design and engine matching,
a turbocharger fitted to a diesel engine designed to run to a maximum of
say 4500 rpm, will achieve optimum turbo boost by around 1800 rpm which
is perfectly placed for towing, gentle and harsh off-road duties.
That the engine doesn't require high rpm also aids in keeping under bonnet
temperatures down, and with the placement of various heat guards, the slightly
increased radiant heat from the turbocharger is normally not a problem.
Also pertinent is the false suggestion that supercharging suffers less
lag than turbo charging, that it provides a greater power output, reduced
combustion chamber and under bonnet temperatures. The simple truth is that
a supercharger is a mechanical device driven by the crankshaft, hence an
inherent loss of power in driving it. Supercharging also relies on engine
revolutions for its own speed and boost levels - exactly the same applies
with a turbo except that as exhaust gasses are used to drive it, no initial
losses are incurred to be recovered later.
Contrary to the popular belief that turbo charging increases under bonnet
temperatures, with AXT's exclusive use of oil and water cooler Garret turbochargers,
these keep under bonnet temperatures to a minimum.
That a turbocharger is often more compact, offers a similar power improvement,
has a proven long lasting record of accomplishment and doesn't suffer or
incur and mechanical maladies, is enough reason to look at equipping a diesel
powered 4WD vehicle with a 'matched' system. In addition, the cost is normally
somewhat less than supercharging, and yet the results are similar if not
better. The icing on the cake though is that the driving experience is improved
to such an extent you will wonder why it's taken you so long to make the
A massive improvement in torque, hence throttle response, more power
for overtaking and no struggling when towing all adds up to making the driving
experience of a turbocharged diesel powered four wheel drive so much better.
For further details, contact AXT Turbo on (03) 9793 7740
About AXT Turbo / Turbo
Systems / K&N Filters / Springs
Coilover and sport suspensions / Email Us / Home Page