Pyrometer and Boost Gauge
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Junior User
Joined: May 2006
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From: New Jersey - SOUTHERN
Pyrometer and Boost Gauge
This sounds like a stupid question, but what exactly is the exhaust temperature gauge for? I have one that came with my truck and obviously its to measure the ex. temp, but why is this important. Im assuming its more or less for when your towing but i'd like to know a little more about it. Is it similar to an o2 gauge on a gasser?
Also, what exactly is the boost gauge reading....I know its turbo boost, but what do the numbers mean?
Im not an idiot, i've rebuilt plenty of engines and worked on plenty of cars, but all gas related.....hoping to get a better understanding of the turbo diesel.
Thanks
Also, what exactly is the boost gauge reading....I know its turbo boost, but what do the numbers mean?
Im not an idiot, i've rebuilt plenty of engines and worked on plenty of cars, but all gas related.....hoping to get a better understanding of the turbo diesel.
Thanks
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
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From: Southwest Georgia
The EGT (Exhaust Gas Temperature) is measured to keep from melting the piston. 1250 degrees (measured pre-turbo) is usually the highest that you want to run it. You can run up to 1400 degrees (measured pre-turbo) for a very, very short time if you know what you are doing, but most gauges show 1250 (measured pre-turbo) as red lining the EGT's and most people stop at about 1250 (measured pre-turbo). You can also measure post turbo which will show lower readings for the same temperature.
The boost gauge measures the amount of boost (air compressed by the turbo charger and forced into the intake under pressure) in psi. 0 boost is atmospheric pressure (natural aspiration). The more fuel demand that the engine has the more air that is needed to combust that amount of fuel efficiently.
The boost gauge measures the amount of boost (air compressed by the turbo charger and forced into the intake under pressure) in psi. 0 boost is atmospheric pressure (natural aspiration). The more fuel demand that the engine has the more air that is needed to combust that amount of fuel efficiently.
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Junior User
Joined: May 2006
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From: New Jersey - SOUTHERN
but what is the point of having a boost gauge? I mean why is it necessary? Is too much boost bad? Too little would only mean your not getting turbo power.... I mean I can understand having a EGT gauge....melting a piston would not make for fun times...lol!
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
too much boost and your turbo will destroy its self. I am not certain what the limit is. some say 25psi some say 35 psi. either way you don't want extended periods of 35 psi. many here including myself take their turbo's up to the low 30's often. Though I have replaced my turbo already becuse of it.
too little tips you off to performance problems, not enough fuel, exhuast leaks, intake leaks, those types of things
too little tips you off to performance problems, not enough fuel, exhuast leaks, intake leaks, those types of things
Posting Guru
Joined: Apr 2004
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From: AZ
When towing the boost gauge is handy to tell you if you are in the power curve and not lugging the motor.
The more boost your turbo is making the cooler your egts get when pulling, to a certain point. In other words your CAN pull a hill in od and get egts a little high, or you can downshift and build up a little more boost to keep it cooler.
The more boost your turbo is making the cooler your egts get when pulling, to a certain point. In other words your CAN pull a hill in od and get egts a little high, or you can downshift and build up a little more boost to keep it cooler.
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