If you pull it off then drill holes on either side of the ones that are there. that way you can turn it will in the car. It wont do mutch for you by adjusting it, and usually it is set to read close to .5V at idle, you cant go over that. what you want to do is to increase the voltage read at wot to give that extra kick you are looking for.
you can get all the info for that here. As well as other cool tricks to make your car go faster
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