Ian_Fearn Posted November 14, 2019 Share Posted November 14, 2019 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. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 14, 2019 Share Posted November 14, 2019 720°C, Ian. Mo 1 Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 14, 2019 Share Posted November 14, 2019 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? 1 Quote Link to comment Share on other sites More sharing options...
Ian_Fearn Posted November 15, 2019 Author Share Posted November 15, 2019 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. Quote Link to comment Share on other sites More sharing options...
Maverik Posted November 15, 2019 Share Posted November 15, 2019 My pretty standard 200 starts to smell pretty warm if I hold 700+ for any length of time. Quote Link to comment Share on other sites More sharing options...
Henrithestonemason Posted November 16, 2019 Share Posted November 16, 2019 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. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted November 16, 2019 Share Posted November 16, 2019 If you don't want reliability issues then don't turn up the boost or fuelling! Quote Link to comment Share on other sites More sharing options...
landroversforever Posted November 16, 2019 Share Posted November 16, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted November 17, 2019 Share Posted November 17, 2019 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. Quote Link to comment Share on other sites More sharing options...
Henrithestonemason Posted November 20, 2019 Share Posted November 20, 2019 So, is there a popular/ recommended EGT guage and probe/ sensor.? Or do I just go with anything first? Thermoguard?? Quote Link to comment Share on other sites More sharing options...
Maverik Posted November 20, 2019 Share Posted November 20, 2019 I got me a Madman EMS, tis great. Quote Link to comment Share on other sites More sharing options...
92a Posted December 28, 2023 Share Posted December 28, 2023 I took this yesterday, and was wondering what the maximum “recommended” temperature was Quote Link to comment Share on other sites More sharing options...
landroversforever Posted December 28, 2023 Share Posted December 28, 2023 Where are you measuring as that will have a huge bearing on what’s acceptible. Quote Link to comment Share on other sites More sharing options...
92a Posted December 28, 2023 Share Posted December 28, 2023 300tdi Defender 90 , I have a sensor tapped into the EGR blanking plate , that reading was after a 70mph run up the M25 slip road at J8 for Reigate, a long steady climb, I replaced the injection pump recently and it had been opened up by the previous owner ( on this forum too ) The other reading is the temperature in the pipe going to the intercooler Quote Link to comment Share on other sites More sharing options...
Maverik Posted December 29, 2023 Share Posted December 29, 2023 From verious Internet research I've done I came to the conclusion that 750 degrees continous seems to be the "general" turbocharger rule of thumb, so it can take higher but for shorter periods of time, I looked at verious information streams from all sorts of vehicle sized turbochargers, the last piece I read was to do with i think D3/4 engine ecu's starting to limit functions when it detected egts over 750, to avoid the temp rising further. This data weirdly seems to pretty guarded by the manufacturers. Engine tuners/remap people will be good people to talk to about turbo temps. 1 Quote Link to comment Share on other sites More sharing options...
fmmv Posted December 29, 2023 Share Posted December 29, 2023 Interesting to see intercooler inlet temp that high. I think the 750 deg is for the oil as much as anything, we used to have a Saab 900 for many years, and a fast B road drive would get the manifold and turbo glowing, quite orange, but we never had any turbo issues; the bearing was water cooled. Quote Link to comment Share on other sites More sharing options...
92a Posted December 29, 2023 Share Posted December 29, 2023 I was also surprised how hot the air gets once compressed by the turbo, boost is about 0.8 bar , the boost is nearer 20 psi on my 200tdi and the pipe to the intercooler gets up to 150 degrees on the same run but always has a lower maximum EGT ( standard pump reconditioned by CJ Diesels ) Quote Link to comment Share on other sites More sharing options...
fmmv Posted December 30, 2023 Share Posted December 30, 2023 That figures: you'd expect the egt to be lower with more boost assuming similar levels of fuel. I think it's important to cool it before switching off if it has worked hard. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 30, 2023 Share Posted December 30, 2023 More fuel burning = higher temps. A bigger intercooler will help keep temperatures lower. There is anecdotal evidence that for every 1° intake temp reduction you will get a 10° EGT reduction. I have seen a marked reduction going from a standard intercooler to a large intercooler. HTH Mo 1 Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted January 11 Share Posted January 11 On 12/30/2023 at 1:04 PM, Mo Murphy said: I have seen a marked reduction going from a standard intercooler to a large intercooler. The same with boost pressure. Higher pressure makes lower EGT Quote Link to comment Share on other sites More sharing options...
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