unknown transmission problem

[240sxvaj]

sometimes my clutch will feel weaker and weaker everytime i punch my car. after i was done racing my clutch will not pull as strong as it use to when i first ran. after a while when i let my transmission and engine cool down for a bit my clutch will get its power back and i will feel the same power but then later on as i punch it more my clutch will have the same problem. i was thinking its my transmission and my clutch but my clutch dont slip gears. so im just confused now . let me know if this is not enough information. thankz

[rogoman]

After a lot of hard runs, the clutch starts to overheat and slips. That's why the car doesn't pull hard.

If you want the clutch to last, go easier on it. Make fewer hard runs and allow more cool-down time in between runs.