My z32 is running gt675rs, 740cc injectors, Z1 intercoolers... I'm wanting to advance my timing map for pump gas. Can anyone shed some light on how much degrees would be a good advance to get more hp without reaching detonation point, It would b good if someone with a similar setup to mines could post a pic of their timing map. O, i use nistune for tuning my car. 91 octane and 16psi of boost. Also can advancing my timing in/before the boost transition area reduce turbo lag