550 HP+ Porsche 928 

Then slogan “FU#$K FUEL ECONOMY” sounds in your head you can ride 6.5 liter Chevy VAN, but if you what really powerful car I can show you what is real stuff. Porsche 928 produced in 1985 year is still very great car. Very strong power plant enables to push this car to the limit.

Then this car was bought it was just stock Porsche 928 with huge mileage and almost dead performance. Skilful styling masters made very nice “shark” style sketch. With a good budget styling work was completed quit fast. Good cars must run fast, but Porsche doesn’t.

First step to performance excellence was UNICHIP engine management. On the dyno it was clear that car was over fueling a lot. Previous owner has installed adjustable fuel pressure regulator and has made some adjustments. Of course the lack of knowledge made it’s job. Powerful 5 liter engine was pulling like a diesel. Power curve stuck on 283 HP mark (357 Nm torque). After remapping fuel and ignition map power increased to 340 HP (420 Nm torque).

Remapped fuel and ignition gave excellent results – Porsche got wide band performance and pulled from the bottom to the top end like a devil. Of course adding two turbos could dramatically change situation, but owner has chosen nitrous.

Nitrous is really throttle in a bottle. At first wet NOS nitrous system was installed. It was simple 1 fogger jet system controlled by UNICHIP. Lathing gas was real power booster! Adding ~200 HP of nitrous gave turbocharger effect! 5 liter atmospheric engine accelerated 1500 kilos of pure metal from 0 to 200 km/h in less then 14 seconds!

What about other mods? No other mods were made … stock engine parts were holding almost 550 HP and over 650 Nm of torque.

Single nitrous fogger for 8 cylinder engine was not so good idea, because of equal nitrous distribution to all cylinders. After several backfires and nitrous explosions in the intake hoses two air flow meters were blown. Final decision was 8 fogger direct port nitrous system. PRO RACE fogger from NOS is able to add over 600 HP. This is very serious system including 20 lb bottle for longer runs.

How much power can handle stock engine? I don’t think that adding more then +250 HP won’t hurt the engine, but better gas distribution will do the right job.