Thursday, Jan 03, 2008 at 18:20
Twinkles
Thought I'd add my thoughts on your questions, although this is only how I perceive the EGT system to work.... not being a mechanic, I may be wrong, but I apply these principles to my own Patrol and so far have been OK...... If I am wrong, I am happy to be corrected!
"If you fit a EGT gauge and you find it overheats, what do you do?"
Basically, it's amatter of finding out what temps are 'normal' for your turbo, and then you can monitor the temp. EGT is measured at the pipe that enters the turbo... which is the exhaust from the engine. The harder the engine is driven, the hotter this pipe gets. So, you need to know what the 'normal' temp is, and what the maximum temp should be..... usually some point
well below molten-turbo-degrees-C. Monitoring the EGT then allows the driver to push the engine to a safe limit, then backing off will drop the EGT, rather rapidly. My GQ has an aftermarket turbo, I usually start to drop the power off around 500 degrees C, but some hills require me to "stay-on-it" and it then climbs to the 600 mark, which is the absolute maximum I would push
mine to. I also watch my boost gauge and have found that at 11psi boost, which is my max setting, my EGT will climb rapidly. Often backing my boost back to around 7 or 8 psi will drop the EGT, while allowing the Patrol to keep it's power up.
"Why do you need this rather than rely on the temp gauge in car?"
By the time the temp gauge registered an overheated motor, you may have more problems than an overheated radiator to worry about. Possibly you will have mashed turbo bits in the engine somewhere. The EGT is monitoring the temp exactly where it needs to be monitored.
Hope this helps mate...
Cheers
Brian
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