When software re-calibration at Hirsch Performance was finished, my car pushed more hp on base boost than a stock Viggen on full boost.
By gently raising boost, Tommy Utengen created a very smooth torque curve, having less strain on engine, transmission an gearbox. Boost never raises above 1 bar.
When using my Maptun Stage III software on exactly the same hardware setup, max boost is around 1.4 bar (on hot days). This results in a little more power on the way up the rev range (until 4000 rpm), but much more strain on engine, transmission and gearbox. Because max hp is limited by the turbocharger, max boost at 5000 rpm is always around 0.8 bar, independantly of the software used. So max power should be about the same for both programs (in reality, around 5% more max power is reached using the Hirsch software).
When using the Hirsch custom software, EGT hardly ever goes beyond 910 °C, the car runs very, very healthy (Air fuel ratio, lambda, ignition, no knocking, low egt, no ic heat soak, nearly no turbo lag).
If you manage to keep temperature low and oil flowing, the pistons should be perfectly happy. They are not bad after all. They are just not as over engineered as the b234r pistons (9000 Aero), thus allowing smoother revving, lower emmisson, lower fuel consumption. It´s all a question of the perspective.
300 hp should be doable with the mods you have. Nordic pulled out 306bhp from a 9-5 aero with less mods.
Tommy was very explicit about what he thought of that. He thinks that most tuners just do the software on their PC, install it on the ECU, drive to the dyno, take the best peak run and don´t care about stable long time performance. He said it would be absolutely impossible that Nordic reaches more than 300 healthy hp, while he, with 13 years experience in Trionic developement, does not.
Don´t get me wrong: He thinks that my car will dyno +300 hp near sea level, too. But stable performance for the stock injectors and the Viggen style TD04HL-15T is somewhere around 280 hp - and I will have those now under nearly all heat, load and height conditions.
Update: I know one 9-5 Aero owner with said Nordic stage 3 software. On multiple dyno runs, it never dynoed more than 270 instead of the promised 300 hp.
N.B. Nordic - like Hirsch - have their own dyno facility.
