Tuesday, May 06, 2008 at 21:03
Mate, as I stated above, you'd be surprised how quickly the exhaust gas temps drop once you take your foot off the accelerator. So, when you say you do a lot of highway driving at the speed limit, that is not necessarily a huge reason to worry about switching off when you pull up.
In fact you may also be surprised how "cool" a turbo will operate, even at highway speeds.....if you are just going along a flat section, not into a head wind etc.
Another thing that a lot of people don't realise is that a turbo does NOT produce heat.....Quite the opposite; it is a USER of heat. I only worked this out when I had my last Patrol (a 4.2TD) and I had 2 thermocouples fitted into a digital EGT gauge. One was fitted in the exhaust manifold immediately above the turbo, whilst the other one was in the usual position of the dump pipe...a couple of inches below the turbo. Typically, the temp in the manifold was about 150 to 250oC ABOVE the dump pipe's temp, proving that the turbo was soaking up a lot of the engine's heat.
I personally would never bother with a turbo timer again, but I am the sort of bloke who drives my rig with a passion and watch the gauges all the time...... I like to know what is happening under the bonnet (within reason). If it were viable to fit temp sensors to each of my 8 cylinders etc, I probably would do so...hahaha
Roachie
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