If you’ve been following the progress I’ve had with the 2015 WRX you’ll know that the stock 2-Piston Front and 1-Piston Rear Sliding Calipers were one of the areas I felt were the weakest when using the car on track. Because of this I upgraded the fronts to a StopTech ST-40 4-piston solid forged caliper last year which made a huge difference not only in lap times but the ability to be on track longer. The one downside to this was that without balancing the rear with more aggressive pads the fronts would cause very extreme weight transfer to the front of the car making the car want to rotate the rear end on very heavy braking. This would not be an issue for most people upgrading just the fronts but with how hard the car is pushed on track it made for some “fun” braking at tracks with high speed heavy braking zones.
So it’s been a long winter and there hasn’t really been any updates to the car over the winter. It ran great through the winter and the few days of snow we had I took it out for some fun in the snow. So with spring upon us it was time to make some upgrades to the car for the upcoming track season. But before we jump into that I wanted to get around to posting the dyno graph from last year of the final stage 2 set-up that I’ve been running. As previously mentioned going from catless with stock cat-back to catted with aftermarket cat-back gained a little power but a huge amount. This is probably balanced out by the cat being a restriction but the cat-back being less of a restriction compared to the stock cat-back. So below is the dyno graph which shows the WRX made 285WHP and just under 330WTQ.
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