Power upgrade guide for MY10 onwards Subaru Forester diesel 2.0 litre engine

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!.

RALLY
IN 2012 and now in 2013, MRT rallied the worlds first turbo diesel Subaru Forester. They won the inugural SUV championship.
More info here including tech data and videos on the Subdru turbo Diesel rally car! 

SUMMARY
Typically this car is a "Subaru's alternative performer for the popular XT model" and a high torque rated car effectively detuned.
There are some great features of this car, stealthy looks (compared to past models), 4wd, turbo 2.0 litre and most of all, a sensible budget with some well planned upgrades and it turns a great car into a XT turbo petyrol beating fun car!! 

ECU
(All Australian models 2010 - onwards)
Can be converted and fully tuned, using EcuteK Software for almost any improvement, and allows solid results with correct settings and allows good improvement.
The ECU in this model can also be upgraded to "EcuteK Race Rom" for added features that were never included in the Subaru ECU

ENGINE WEAKNESS's
Bottom end and mid range performance can be dramatically improved with ECU tune. The engine is detuned (as subaru dont want it to beat the XT model) and also limited due to emisions requirements when delivered by the factory.
Incredibly tough engine that when rallied by MRT never failed!
However poorly designed upgrades can magnifies the risk of failure.

ENGINE SENSORS
On this model the aif flow meter sensor is more reliable than previous model, but can suffer contamination and in turn this will effect reliability and performance. (see MRT for this solution)
 

INTERCEPTOR ECU OPTION
Not worth considering as the intercptors simply do not have enough options to tune and modify the latest technoplogy control inputs.
ZERO VALUE

NEW (replacement) ECU
Factory ECU retune is best value unless a really serious engine rebuild is chosen. 
See notes above

INTERCOOLER
Factory fitted unit is good, dont fit a FRONT mount.
Use a better replacement MRT top mount, but choose carefully.

INJECTORS
Bigger injectors empty your wallet and add no power unless part of a E85 fuel retune or major engine rebuild. 
Save your $$ for suspension and get some GOOD improvements.
OEM Injectors are big enough unless you do a major engine rebuild.

FUEL PUMP
More than adequate

EXHAUST
(Some traps for people here, unless carefully chosen.)
Very little benefit in changing. Must only be changed AFTER the ECU is tuned. Even then maginal value!
Get this wrong and the car will suffer CEL lights, deactivate the Cruise control and cause poor fuel economy.
The twin rear mufflers add no value in just replacing them and should be completed as a part of a whole turbo back exhaust kit.
In some cases depending on final tune the twin mufflers can be re used with a complete exhaust, consult MRT for this.

AIR INTAKE
Other than a intake noise no power here. 
The positive intake pressure with the factory intake is best kept in place.
A replacement panel filter in the std airbox will save on future servicing but give no power improvement.

ENGINE ANCILLIARIES
Items such as aftermarket plug leads, high capacity discharge ignition systems etc all will ad very marginal if any improvement.
 

TURBO
If you have the budget a turbo upgrade will add some power, but be careful the OEM turbo is a VGT unit that uses variable geometry vanes. 

ENGINE INTERNAL
Incredibly reliable.

OTHER OPTIONS
Is the car serviced correctly? Because often a service by a workshop who really knows subarus 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, its a subaru suggested option).
  • 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 trans and diff oil, again like engine oil this adds up in benefits.
  • Timing belt, fuel filter are again areas that should be checked and renewed.

SUSPENSION
Check out the performance / suspension section for REAL gains and benefits.
If I owned this suby, 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 the O2 sensor
  3. Check brakes
  4. ECU upgrade and re tune.
  5. New brake pads and discs if needed
  6. Front and rear sway bars.
  7. Complete (quality) exhaust.
  8. Front and rear sway bar links
  9. Positive shift kit for 6 speed models
  10. New Top Mounted Intercooler.

OTHER RESOURCES