Most important guages for boosted engines?

[LtNoogie]

And what would be considered too hot on an EGT guage? Do they typically have a green and red zone?

What would be the remedy?

[largeorangefont]

Originally Posted by LtNoogie

And what would be considered too hot on an EGT guage? Do they typically have a green and red zone?

What would be the remedy?

I'd say 1500 F is time to start to be concerned. This is probably a bit conservative for the Yaris, and it varies depending on the car, piston type etc.

My WRX could hit 1600 no problem, and my Cobra rarely breaks 1400.

Turbo cars can get you into trouble because you can hit full boost at less than full throttle. An example would be going up a hill. If you go part throttle up a hill in a turbo car the boost will rise and you will see EGTs climb. This is where you can cause engine damage. This is precisely why EGT and boost gauges are needed on a turbo car.

The solution for this is to let off the gas and not make any boost, or floor it to get the car to the open loop fueling map and bring down the EGTs with extra fuel.

Supercharged cars do not have this problem because boost is limited by engine speed.