rx7legend

well today i took my TII out and it has beens sitting for a month and a half, i put a boost controller and an e-fan, and i was eaguered to see how my car would run now, so going to my house theres a straight line almost a 1/4 mile and theres no oncoming traffic only me, so i decided i will test the car. rev the car to 6000 and left the clutch out at 8000 and it was a perfect launch couldn't be better but whe i shifted to 2nd gear it didn't want to go in so the revs get down to like 5000 and then it goes in i was like wtf, so i decided i test it again because maybe it was me the problem, again another perfect launch at 8000 and when i shift to 2nd gear negative, again the gear didn't want to go in, the car was fast as hell the best launches i have ever had. when i drive the car normally the gears go in just fine and i was just wondering if anyone know why my 2nd gear don't want to go in when i drive hard???? i was going to the track to see what 1/4 mile i will do but whit these problem i will lose like half or even a second and that sucks.