Alrite, I'm in the final stages of building my rally car. ( escort cosworth). I have fitted a p8 ecu which has a chip for grey injectors, water injection and antilag. It was fitted to a group n car. My engine is standard with a t34 turbo , water injection, rs500 intercooler and grey injectors. I was wondering if I need to map the car or will the ecu and lambda sensor keep the car running correctly? Cheers for any help......