Ok, we just wrapped up our prototype 3inch exhaust. We are still making some changes to the system, but I want to share a quick teaser dyno. On the first pull, I realize just how much trq, spool, and power we were missing and the results are nothing short of spectacular. Boost level is the same on both runs, and I think we're one of the only shops to post boost curves. All in the interest of sharing as much as possible with the community.
The only change is we switched from the stock exhaust to our 3 inch exhaust. I did not adjust timing, but I did have to ADD additional fuel because the new exhaust naturally resulting in less backpressure and more efficiency from the engine.
400rpm earlier spool which shifted the power curve 400rpm to the left
50ft/lbs peak trq improvement and 21whp peak improvement.
But even more telling, is the 100lb/ft trq improvement in the midrange
That said, the car as it sits now is actually decent in the midrange and a lot of fun to drive around town. Certainly not a road racing turbo by any means but much more tolerable than I would have expected with this big PTE 6765. I've got a bit more tuning to do on pump, but so far these are the highest numbers I've produced from 20psi on a 100% stock engine STi on our dyno. It would be nice to hit the magic 400whp on pump. Good stuff.
Shortly after that, we'll do some before/after testing of the one-of-a-kind AMS Prototype Intake Manifold.