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Thread: 2.8 Turbo & Engine Temperature

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    Default 2.8 Turbo & Engine Temperature

    My engine temp is a constant 86 degs. When I am a little heavy with the right foot, the temperature can rise fairly rapidly to nearly 90 degs.

    OK, so 4 degrees isn't much but this is the only situation I notice a variation in temperature, apart from warming up.

    The question is this: Is it normal for this to happen?

    I remember reading a while back to idle the engine a while before switching off to help keep the turbo bearings lubricated. Is this correct, and is this related in anyway to the temperature problem?

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    Regular Member Gsi3.2's Avatar
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    yes, idle the turbo/engine down, otherwise if you cut the engine after a hard run then the turbo is left spinning at 150,000RPM ( yes..Really) with no oil to keep the bearings cool..

    I think the varying temp is due to the thermal load that you are placing on the engine when giving it beans,.more power means more heat created...so normal.. in my opinion, yes...my GSI heats when i give it 'large'...

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    [Ex]Admin Duncan's Avatar
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    Not sure about the temp of a 2.8T as I have a 2.0T (which sticks steadfastly at 85C for most of the time, rising slightly (90C max) in traffic on a hot day or after a good spirited run, when the the car is being driven more slowly (so less cooling force) but the engine is still hot.

    As for the turbo, it's always good practice to idle the engine for a bit after a bit of a run. I meticulously do this - in fact I'll drive around gently for a few minutes to make sure the turbo has had time to cool down. During that period, as above, you'll notice that the temperature may rise a bit as the engine is still hot, but getting less cooling force through the engine bay as the car is going slower. Nothing to worry about I'd say.

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    Great, thanks guys, very reassuring.

    Now you mention it Duncan, I have also noticed a slight increase in temperature when stuck in traffic.

    I've been stationary and idling for around 30 seconds before switching off if I've been unable to drive around a bit before stopping. Should that be adequate?

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    Regular Member Gsi3.2's Avatar
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    that kind of 30 second idling will be fine, that will give it plenty of time to spool down...

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    OK. Thanks for the speedy replies!

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    Quote Originally Posted by Gsi3.2 View Post
    that kind of 30 second idling will be fine, that will give it plenty of time to spool down...
    The manual for my engine says 30 secs so that should be fine - but me being me I always give it longer. No harm if you can.

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    indeed, the more cooling oil you can get on to the bearings while the turbo is hot is only doing good...that turbo glows up to 600deg c under hard boost and it takes time to cool down...and one other good practice with turbo'd cars.. petrol or diesel, is to change the oil often as the turbo relys on good quality fresh oil...a few extra services is cheaper than a new turbo

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    Mine usually runs at 92-94...never worried about it.

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