EGR Temps

[Ian2011]

Hey all,

Just wondering if anyone out there has the correct range that the 2.8 td EGR temp is supposed to be or alternativley the range that their own car operates at. I have EGR temp guage fitted and whilst travelling up some hilly country, temps regulary got up around 500c + at 80 -100ks in 4th or 5th
gear around 14 -15 psi of boost. I woud just like to be sure that this is still within operating range and operating at these temps for extended periods will not cause permanent damage.

Cheers

[Rusty86]

I assume you mean EGT rather than EGR?

I can't comment on the 2.8 but on the 3.0L over 550 deg should be the danger zone anything over this and especially for longer periods would be dangerous. Not sure the temps that you will melt pistons but if it's getting to 650-700 I'd be pretty worried you'd do damage.

Anything you can do to lower EGT will be beneficial, I've just had the EGR blocked, Dawes and Needle installed and the manifold and throttle body cleaned of carbon build up, and my EGTs have dropped dramatically. Now operates around 230-250 (used to be 350-400+) around town with increases under load, but much slower increases than before.

Larger exhaust will help lower EGTs too, I'm sure you know all this, but in just in case :)

Cheers mate,
Rusty

[Ade]

Basically, bellow 700c/1300f pre turbo is considerably safe. Post turbo egt will read lower, 90-150c/200-300f lower than pre turbo at full load and as low as 260c/500f at cruising speed. My TD42 will see around 450c cruising at about 90-100km/h.

Cheers,
Ade

[Ade]

Agreed with Rusty, anything you can do to lower EGT will be beneficial. More/denser air into the motor to lower the egt. My probe is pre turbo, where's yours?

[nissannewby]

Turbo efficiency and setup will determine how much difference there is between post and pre turbo egt temps. But as all have said 550 is usually a maximum safe figure post turbo. My 4.2 sits on about 250 Celsius when cruising at 100 and takes a bit tO come up when she is loaded.

[Ian2011]

Yes, I did mean EGT (had a few beers last night), thanks for the replies, my probe is post turbo and will generally sit around 180-240c at 100k so I was never really worried about it. I got up to the higher temps doing uphill highway driving, first time I have seen it run at the higher temps. I have the EGR blocked but have no Dawes valve fitted (not sure if required yet). Engine has just been rebuilt so I am not keen to do major damage to it just yet. I didn't have guages on it prior to the rebuild so I really don't have a basis temp that I could say was normal for the old engine to compare with.

[Rusty86]

What was the reason for the engine failing previously? Could it have been very high EGTs and not knowing due to no gauge?

[Ian2011]

Rusty,

the harmonic balancer nut decided to go for a holiday which led to crank damage, decided to go whole rebuild for piece of mind and hopefully a few hundred thousand more klms

[Ben-e-boy]

Basically, bellow 700c/1300f pre turbo is considerably safe. Post turbo egt will read lower, 90-150c/200-300f lower than pre turbo at full load and as low as 260c/500f at cruising speed. My TD42 will see around 450c cruising at about 90-100km/h.

Cheers,
Ade

450c cruising! Ade I think thats a bit high for crusing, mine sees about 250-300 on resonably flat road stock gearing, 35's no intercooler, I have to push the ute to see 450 degrees

Cheers
Benny

[Ben-e-boy]

Yes, I did mean EGT (had a few beers last night), thanks for the replies, my probe is post turbo and will generally sit around 180-240c at 100k so I was never really worried about it. I got up to the higher temps doing uphill highway driving, first time I have seen it run at the higher temps. I have the EGR blocked but have no Dawes valve fitted (not sure if required yet). Engine has just been rebuilt so I am not keen to do major damage to it just yet. I didn't have guages on it prior to the rebuild so I really don't have a basis temp that I could say was normal for the old engine to compare with.

180 to 240 degrees is nothing to worry about, in fact that about as good as it gets temp wise

[Sir Roofy]

180 to 240 degrees is nothing to worry about, in fact that about as good as it gets temp wise

agree with that ,ive opened my 3l up as much as i can and run those temps most of the time
they creep up once under load but nothing like it did when i first started doing the NADS