what youre saying is fair enough and makes sense, but the point of the question was to find out why it seems different after those few more minutes of letting it sit. you obviously know youre stuff so theres nothing to argue about, and totally makes sense about driving warming it up quicker. now that ive actually seen it make a difference after the battery had been disconnected, im going to assume its something going on with the ecu and cold start...so i guess the best thing would be to do is talk to someone who has an understanding of the tune and cold start settings...thanks for your response anyway its always good to learn a thing or two