The WRX has a few things against it - cast pistons, open decks, etc. Though the EGTs may be able to be a bit higher with water injection controlling the flame front even with these shortcomings - there really is no reason to push it. The pressure and torque being generated with 1600 EGTs while using water injection is quite a bit and the cylinders have enough issues with ovalling without increasing the cylinder pressures further.
It will be interesting to see as people start pushing the STi's with their cast (but better) pistons, treated valves and semi-closed decks whether the EGTs and cylinder pressures can be increased. Though some are spinning bearings (probably oil starvation) and cracking ring lands already on the flat-4 2.5's.
|