I must admit the factory tune on the legacy 3.6 is not so bad. I usually don't say this about factory tunes as almost most of them are horrifically lean at low-midrange for emissions and fuel economy purposes. However it's possible to have the best of both worlds. I spent a lot of resources on this tune and ended up with the conclusion that without extensive hardware modifications such as a headerback exhaust, intake and (cams if possible) there are minimal gains at full throttle with the ECU tune.
The biggest problem with this map is the super rich top end and the stoich/lean bottom end. The mid range runs in 12-13s stock with ample timing and intake CAM advance as required. In fact the AVCS itself is tuned for power and I did not manage to increase power too much with various AVCS combinations. However on some runs a little exhaust retard did provide top end gains but it was not always reliable. Most of the gains came from leaner fuelling and less mid-top end ignition timing (that's right retarding timing gained me power). The biggest plus in this tune for me is the linear but sharp thottle mapping that I made. It feels a lot more responsive and removes the throttle governor at lower RPMs. The downshifts from 4-3-2-1 are also slightly quicker. The hesitation I was experiencing is also gone at 3500 rpm and on throttle lift off. there were roughly 15whp and 20wtq gains on the dyno but i feel as though the gains at part throttle were even more significant. However the dyno is from an old revision, the latest map is probably making a few more ponies. Please note
if you have the factory intake, use the stock subaru MAF scaling table! The MAF has been scaled for Takeda Stage 2 CA Intake on my maps!
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Features:
- MAF scaled for afe takeda CA Intake
- max engine load B set at 3g/rev
- CL/OL delay disabled / zeroed
- open loop fuel map revised for better power and throttle response
- closed loop fuel map revised for better throttle response and cruising economy
- ignition timing completely revised for reliable power
- AVCS touched up for better power, specially at low and high RPM
- coolant fan temperature thresholds lowered
- retarded overrun for pops/bangs on lift off
- throttle/dbw tuned for linear but sharp design
- 3500-4500 rpm hesitation and rev hang tuned out
- many more changes...
