Quick question about drag racing to those who do it a lot more then me

[Woz]

here is the thing, yesterday when i raced i only hit 14lbs when i should be running around 18. after every shift i was gas petal to the floor. afterwards on the road, i went half throttle to full throttle and boosted to 18. when drag racing should i be doing half throttle or a little more to full throttle?

[STiedVR4Guy]

How long was your car sitting and running while waiting to line up?
What kind of intercooler do you have?
How hot out was it?

My guess is your core temps got a little hotter than normal thus increasing intake temps and making it harder to boost.

[Woz]

my car sat for about a hour to a hour and half. Then I let it warm up for about 5-10 mins. No wait on racing, went right to run it. It does it all the time... full throttle doesn't go 18psi in 3rd. It will only go to 18psi when I go from half to full throttle as the rpms go up... I have to check some vacuum lines or something.