i just recently(2 days ago) put a full t3/t4 turbo setup on. i am running an external wasgate(xs power). i am currently running no O2 sensor. i have a oil cooler kit hookup also. my problem is sense i hooked up the turbo the vtec is not working. the oil cooler kit has been hooked up for 5 weeks before the turbo and the vtec was fine. i am running the greddy blue box for engine management. the blue box is all hooked up correctly. i also have full exhaust, underdrive crank pulley, fuel pressure regulator, and other none engine related parts. all these parts were on before turbo and vtec was fine. i am not sure if the turbo is using so much oil that its not reaching the vtec sensor or what. i think the no O2 sensor might have something to do with it. the car is a 95 with OBD1. has anyone had this problem before?