jet particle emitter effect limited loops

even though ive tried to reduce the burn rate (aka max emission) and maximized the loops, the jet im using for a plane game im making is still limited…ii had made it work before but know it isn’t workking for soem reason. in addition to the particle renderer and emitter options, i have attached a scirpt onto the jet gameobject. Code below

particleEmitter.emit = false;
audio.Stop();

function Update () {

if(Input.GetButtonDown("Fire1")){
    particleEmitter.emit = true;
    audio.Play();
	}

if(Input.GetButtonUp("Fire1")){
    particleEmitter.emit = false;
    audio.Stop();
	}

} 

can anyone help me figure this one out?

okay thx…syclamoth…you wouldn’t by any chance know how to make something increase its speed (like a boost)?