I own a 85 300zx turbo, and i am using greddy blue from a scion tc turbo kit(it came with the kit)! I know i have to set all the jumpers to my car and number of cylinders. I was wondering if i have to hook up the computer and erase the tune or if i can just set the jumpers and turn dials to 0 and have some fun with the dials witch are 20 percent fuel increases. Then later on when i hook up a pc i should zero out the maps right? Or erase whatever tune greddy had in there. Or do i have to erase the tune with the cable before everything? thanx for any help