Our installation of the 3 port solenoid was super simple, it came with a jumper harness so we did not have to hack up our wiring and we simply bolted to the stock solenoid bracket although we could only use one instead of two bolts. The solenoid was held very securely so this won’t be an issue. We plumbed up the vacuum lines so the solenoid was in between the line leading to the wastegate actuator with the third vent port bleeding into the air intake between the MAF and turbo compressor inlet. We plumbed everything up with Hose Techniques thickwall high temp red silicone vacuum hose.
|Our three port boost control solenoid all ready to rock. This view is looking up from under the car. The boost control solenoid can be found under the air box on the driver’s side frame rail.|
The three port solenoid requires different mapping than the two port which required an update for our ECU. Our friend Naji Dahi of Looney Tuning reflashed our stock ECU with Tephra’s V7 ECU software using ECU flash V 1.41. All of this stuff is shareware available on the net. Tephra’s V7 is an excellent piece of software that allows high powered EVO’s to run the stock ECU. The fuel and spark maps have much higher resolution than stock and the load cells extend out to allow the ECU to work at high power levels where previously it would top out at just over 400 hp.
Perhaps the coolest thing is that the V7 software allows the use of two maps that can be accessed by applying full throttle and cycling the key. In our case we can have a normal map and a water injection map. Tephra’s V7 also allows no lift shifting, launch control, a valet mode, safety boost with knock detect and or wideband threshold detect and flashes the check engine light when knock is detected. All while using the reliable OEM ECU and wiring.
|This isn’t the latest version of Tephra’s ECU GUI but it shows how you can program your factory ECU like a stand alone. Cool stuff.|