Evo IX: Stock versus Turbo XS Exhaust & Flash Tune

I know that there is a bit of interest out there about the sort of gains which can be made on the Mitsubishi Lancer Evolution engines with just the fitment of an aftermarket exhaust. In fact, the gains which can be made are quite substantial. Moreover, I have proof.

Here is a comparison of a stock Evo IX engine and the same engine fitted with a 3 inch Turbo XS exhaust and a flash tuned ECU.

The latter combination yields a 26% gain in maximum power. Most notable, however, is the massive gain in torque across the entire rev range. On the street or on the circuit, this would result in a much more flexible and useable engine.

Stock R35 GT-R - Dyno Power Run

To put these numbers in perspective:

Model? Nissan R35 GT-R

Modifications? None

Fuel used? 98 RON pump fuel

Why the flat spot is the mid range? Not sure. That’s the way Nissan made it. The tune was massively rich; so, this would more than likely explain it. It was literally choking on fuel.

Is the boost really that low? Yes, it is.

Is the engine really still making power when the limiter cuts in or did you stop to avoid the 180km/h limiter? It closed the throttle on me (i.e. it hit the rev limiter).

This is just the beginning. The workshop is beginning to get overcrowded with R35 GT-R parts ready for testing, including the HKS GT600 and GT800 kits and a titanium exhaust system. Stay tuned!