Anyone know why

Just come back from southend come off the slip road onto the A127 put my foot down and the car felt a bit sluggish pulled in to the petrol station for some fuel and could see steam from the bonnet vents so i openned the bonnet and the turbo was glowing orange

All i have done was take the dump valve off today as the car kept cutting out which it hasnt done yet since the dump valve has been removed.

Anyone got any idea's why the turbo is glowing orange?? is this ok?? what will stop it happening??


Brian