Well last Friday we had the car back at the dyno. The cooling problems are not completely sorted out, however we were able to get the tuning done with a couple of breaks in the middle.
The first map to be tuned was the low boost map. Here the boost was limited to .3bar. We left the rev limiter at 7000rpm, the map was set at intervals of 500 rpm increments, once this was done we went through the maping and made adjustments at 100 rpm intervals, albeit very small adjustments, then it was onto the power run, this is the part that gets pretty exciting, the car is run up to third gear, the dyno is loaded up and the motor is run through to the 7000rpm limit, The rear of the car squats down pretty hard and the noise is incredible, over the noise of the exhaust you hear the rush of air into the air filter, WOW. Any way these are the figures you are looking for 147kw and 220nm of torque! Not bad for very low boost setting.
Now onto the .7 bar run. The fuelling map is adjusted using a lambda probe stuffed up the exhaust pipe. With the extra boost more fuel is added as required to keep the readings within spec. The power run hear is as follows 182kw and 280nm of torque.
These figures are actually pretty good for the standard WRX sti motor.
The internals of the motor are said to be safe up to max boost pressure of 1.3bar. They say that 240kw would not be an unreasonable expectation. who knows, maybe one day I might want more power and start to play again.
We have a small problem with the management system that prevents us from starting the car in the high boost position. They expect that this will be resolved but if not it is not the end of the world as 147kw is not to shabby.
I got to drive the car over the weekend, although I had to keep an eye on the water temperture. The engine management system was set to cut the motor at 107degress C and I managed to keep it below this level without too much trouble.
Driving Impression.
Well how the hell do you try and describe the experience of driving a car with a power to weight ratio of about 200watts per kilogram. The car launches pretty easy, getting the correct amount of power with a touch of clutch slip gets the car moving very quickly, 1st gear is over in a flash and you change to 2nd , the dump valve makes an almighty whoosh, the turbo keeps spinning and you release the clutch, Now things get pretty serious, the motor is on boost and the level of acceleration is mind blowing what feels like seconds later you are approaching 60 miles an hour and you change to third, the dump valve blows of and you release the clutch and bury the throttle and then tragedy! The clutch can