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For myself I am interested in getting the most out of the FA20. Im not looking for peak power. Im looking to optimize the power thats already available and have a tighter flywheel to hub margin.
To do that i have to target problems the FA20 are facing in terms of optimized performance.
-EL headers with a better collector will always warrant the best gains on a n/a boxer4.
-D4-S gives us the best fuel range per stroke possible, but like all cars, are factory tuned for a balance of emissions and performance and not total performance. This is evident seeing 10.AFRs on the powerband during dyno runs.
-heat soak and AITs could always be better on boxer4.
-tighter timing adjustments to favor advancement, and better AVCS characteristics.
-Head flow and valving could always be considered. Even Performance Yamaha heads could use some work.
-stronger and lighter internals will help friction losses to a minimum.
... etc
Bolt ons add power, and like most turbo cars they mask performance gains on the level of optimization. Im trying to avoid as much bolt on performance as possible.
My ideals spawn from how Mines tuned their R34 GTR. What they looked for was making a factory setup better, not peak power. Which is why it performs much more better around a track than similar tuned GTRs with boasts 10-40% more wheel power.
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