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Ian_Fearn

300tdi Safe EGT temps

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Does anybody know what is considered a safe max EGT temp? It’s a 300tdi with bigger intercooler and VGT turbo on a 3 ish ton Defender motorhome.

 

 

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The 720 number is the continuous maximum specified by Garret for their turbos.  Nobody really knows what is the safe maximum.  A lot of people run much higher and are not destroying the engines.  720 is probably a nice safe temperature to run fall of the time.  

What boost are you running?

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That’s great thank you. I’m rarely going above 600. I’ve not got a boost gauge so I’m not sure, it’s just as set by BAS who supplied the turbo.

I was hitting a steep motorway down in Spain yesterday and noticed it at ~650 and  realised it’d not been that high before.

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My pretty standard 200 starts to smell pretty warm if I hold 700+ for any length of time. 

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I don't have an egt.

I've been tweaking with excellent results.

My only test at present is a handheld u.v temp pistol. After a 3 km sustained 3500rpm 4 gear full boost pull. I jump out,  lift the bonnet and take readings, 25 secs later. I know it's funny, but that's my temporary method. I haven't measured more than 480 deg c on the maniflold turbo region. Normal highway drive 280deg C.

My question is how much hotter would the gas measure at a sensor probe ? ...compared to the thermally conducted reading I'm measuring.?

I'm preparing this tough old disco 1 for a 1500km motorway xmas trip to leave at a beach property as a street legal hack about.

I am very cautious now. Having cooked a tdi 300 on another disco 1 in 42deg( when I turned it off at a roadhouse

without cooling for a while !)...and subsequent summer trips.  Damaged 2 p38 v8s.!! Same conditions. 

Despite preparation and care.!!

**** sometimes happens.

I don't want problems this time.

Can someone recommend an egt guage and probe that will install simply.

All year I'm in alpine cool temps. But that one xmas trip often experiences days of 37-42.

I don't want to hurt another engine. Or be roadside awaiting a tilt tray in 42deg with grumpy family again.

I'm happy to drive 20kph slower.

But I want to know if I need to.

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If you don't want reliability issues then don't turn up the boost or fuelling! 

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19 hours ago, Henrithestonemason said:

I don't have an egt.

I’d fit one before doing any tuning! Measuring the manifold like that isn’t going to show the figures that matter as the EGT drops off so quickly after you lift in my experience. 

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My 200TDi will hit peak temps in excess of 850 degrees before the turbo, it starts to smell as well. Reliability hasn't been an issue. 

The harm is done when you hold them temps for long periods. Cruising it sits between 550 and 650.

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I got me a Madman EMS, tis great.

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