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Power upgrade guide for
Mitsubishi Challenger 2.5 l Turbo Diesel engines

We get many calls for upgrades on this model, as a guide to assist you we have created this list to save your time, guarantee your money is invested correctly and most of all give you maximum value!.

SUMMARY
Typically this car in Australia is half a off roader and half a on roader. Hence its SUV name.
Sports Utility Vehicle
There are some great features of this car, 4wd, turbo, dual cab, light weight great looks and most of all, a sensible budget with some well planned upgrades and it turns it into a great car!

ECU
Can be converted and fully tuned, using EcuteK Software for almost any improvement and allows solid results with correct settings and allows good improvement.
Car is detuned by Mitsubishi and great results are hyere for those who want them!
A retune make more Torque, more reliably.
Dont under estimate the incredible improvement with a good ECU retune. 
more info here on an EcuteK Factory ECU upgrade for the Mitsubishi Challenger 2.5 Turbo Diesel 

ENGINE WEAKNESS's
Bottom end and mid range performance can be dramatically improved with ECU tune.
The engine is detuned by Mitsubishi and also Torque limited when delivered by the factory.
Poor boost control with the factory standard settings can be annoying.
Boost control, can be improved.
(Engine does not have closed loop boost control) 
The factory turbo is reliable, but if over boosted with boost controllers etc will result in wasted power.
Soot build up due to EGR is common (costs long term to clean!) and thius is part of the retune and also improved with the ECU upgrade 

ENGINE SENSORS
No known faults. 

INTERCEPTOR ECU OPTION
Not worth really considering as the intercptors simply do not have enough options to tune and modify the latest technoplogy control inputs.
Plus in ECU devices simply increase fuel deleivery, resultiong in poor engine efficiency and huge smoke outputs. This also results in long terem excessive soot build up in manifolds

NEW (replacement) ECU
Factory ECU retune is best value unless a really serious engine rebuild is chosen. 
NOTE 4 x 2 model is DETUNED more than the 4 X 4 
See notes above

INTERCOOLER
Factory fitted unit is good, dont fit a replacement FRONT mount.
ONLY fit aftermarket bigger intercooler after major engine modifications 

INJECTORS
OEM Injectors are big enough.

FUEL PUMP
More than adequate

EXHAUST
(Some traps for people here, unless carefully chosen.)
Turbo engine pipes with collector to fit wastegate will help marginally, but costly to fit and will add some throttle response. 
80% of Torque gained is via ECU tune and the remaning 20% is exhaust and other minor mods 

AIR INTAKE
Other than a intake noise no power here. 
A replacement panel filter in the std airbox will save on future servicing but give no power improvement.
Sorkels dont add power, just water crossing safety. 

ENGINE ANCILLIARIES
Crank case breathers and other minor mods only here.

TURBO
If you have the budget a (bigger) turbo upgrade will add (peak) Torque, but be careful the OEM turbo is damn good and very hard top beat and is best kept in place unless you have the right other parts to match a new turbo upgrade.
ECU tune is best value first
If you want big grunt and big torque then ok, this is an option here, then you need to plan a engine rebuild or be wary of the resulting load on the engine.

ENGINE INTERNAL
A rare occurance.
A rebuild will cost over $7k and then you need to choose carefully there are many options, but only if you REALLY want to.

OTHER OPTIONS
Is the car serviced correctly? Because often a service by a workshop who really knows Mitsubishi's will be your best choice for first place for power and reliability.

IE:

  • Upper engine cleaner and in tank fuel additive. (when was this last done, as often the Jap import cars have huge carbon build up).
  • Good quality low friction engine oil such as Mobil 5 w 30 will give around 5 kw and better fuel economy over a non synthetic oil.
  • Fuel system service, MRT offer this and often get good results, cleans the EGR "gunk" out of the intake and combustion area.
    Also injectors as well as inlet manf and exhaust as well as fuel pump, lines and sensors.
  • Synthetic gearbox, transfer case and diff oil, again like engine oil this adds up in benefits.

SUSPENSION
Check out the performance / suspension section for REAL gains and benefits.
If I owned this car, I would invest some of my budget in the MRT XB kit and then brakes and suspension as this is guaranteed BEST VALUE!
more here http://mrtperformance.com.au/performance/suspension

FREE CHECK
Refer the MRT vehicle service section here and take advantage of our free 78 point check to ensure your car is in top shape!

PRIORITY LIST

  1. Check service history.
  2. Check brakes
  3. ECU upgrade and re tune
  4. New brake pads and discs if needed
  5. Front and rear sway bars.
  6. Complete (quality) exhaust.
  7. Front and rear sway bar links

OTHER RESOURCES

 

 

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