Vishnu's 255 LPH fuel pump is a direct replacement for the stock fuel pump.
After perfecting the 91-octane-specific XEDE map, Shiv wired the XEDE to control our Aquamist water injection. He then developed a specific water-friendly map, advancing the timing and leaning the mixture slightly. Since we plan on using the water mostly as a thermal control when running the car at the track on hot days, Shiv was conservative and did not push the limits of the water's anti-detonation capabilities.
Driving Project EVO on the long trip home to Southern California, we were amazed at the difference in power and driveability. The throttle response was greatly improved and the turbo spooled faster. We are also getting slightly better fuel economy. We were eager to return to XS Engineering and check the power output compared to our last dyno sessions. The car felt powerful and we were eager to see just how much more powerful it was.
We booked time at XS and redyno'd our car against our prior runs. We were amazed at the difference. On 91-octane pee water, Project EVO belted out 323 whp at 7025 rpm, an unbelievable 61-hp gain from our previous poor showing. We knew that the tuning had made a big difference but we were amazed to see it here right in our face. Now our car is where is should be given the bolt-ons installed.
That said, we turned on our Aquamist water injection system to see its effect on power. Remember, we had tuned the injector system very conservatively, using it mostly for reliability and thermal control instead of a power adder. With the Aquamist water injection system turned on, our 4G63 belted out 335 hp at 7404 rpm.
We were stoked; we had gotten more power with an even greater margin of safety. This power level is pretty good considering the EVO's 4WD system soaks up more power than your typical FF or FR powertrain.
For instance you would be looking at least 360 whp on a 2WD dynojet, an awesome amount of power considering we are running 91-octane, a clean-air catalytic converter, a stock turbo and have total reliability.
In the next installment of Project EVO, we will add a race-only catless downpipe and tune the ECU for race gas and maximum safe power, sticking to the bolt on theme.