Turbo for a car game

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Insane Games

Sorry....
Well i made a turbo for my 3d car race.
Car race = just a cube race only for now...

The turbo is this function:

; if space hit and have a turbo left
If KeyHit( 57 ) And turbo > 0
turbo = turbo - 1
turboAcionado = 1
EndIf

then if turboAcionado = 1 in the car movement it get's aceleration + 0.001 (double the value)

But i can't do a timecounter to set just 3 seconds for turbo, and then disable the turbo...
Help me please!

Thanks!
MB

PS: If my question is a crap please tell me and i'll try to say in other way!