Td42 egt

[Stropp]

10 lb boost sits on 350/400 at 110k around up a decent hill 500 at 16lb sometimes just over 500 but not often

[Hodge]

Can 4.2 egts be a little higher than 3ltrs? Reason is the turbo on a 3ltr is a vnt type, which is more prone to heat failure than a STD turbo setup - like what is on a 4.2.....

I think it's actually the other way around. All 3L that I know of run really high EGT's compared to the 4.2's. A lot of CRD's hit 600+ in a heartbeat straight out of the factory. As far as I believe, they handle it really well... Maybe not the early ones though.

[Hodge]

Oldmav explained EGT's in 4.2's really well at Roofys donk party. Can't remember exactly words, but they can handle high EGT's but not for steady prolonged periods... that bloke and Mat were a technical encyclopedia that night lol.

[Cuppa]

The bloke at the workshop who dynoed my car after fitting the (3” exhaust/13psi) reckoned that the ‘back off' temp is 600 deg.C. In the interests of longevity I’m a bit more conservative & have my alarm set at 525 deg.C. However it is pretty rare that I get it up to alarm temp, usually run between 250 & 400 deg.C. Before the dynotune reaching 600 deg.C was worryingly easy. Makes me wonder how many folk who fit exhausts & increase boost without an egt gauge are happily driving around without knowing the temps are up that high.

[Hodge]

As Cuppa said a lot of people don't know or or just don't want to know and simply happily just drive it and never had an issue.

Sent from S5

[gubigfish]

As Cuppa said a lot of people don't know or or just don't want to know and simply happily just drive it and never had an issue.

Most are probably not aware of the issues that can happen from not monitoring EGT. Makes you wonder why the manufacturers don't fit them as a standard gauge or at least monitored by the ECU in the new common rail engines.

I've not seen mine get higher than 450 yet but also haven't been towing or a fully loaded tray either.

[Hodge]

Most are probably not aware of the issues that can happen from not monitoring EGT. Makes you wonder why the manufacturers don't fit them as a standard gauge or at least monitored by the ECU in the new common rail engines.

I've not seen mine get higher than 450 yet but also haven't been towing or a fully loaded tray either.

Yeah so true and a lot are not mechanically savvy so just drive the car the way it is. I remember reading and thinking about EGT's for ages and the first car I ever had one on was my 3L CRD Patrol. When I finally fit the gauges I was shitting my self driving it, because it hit 500+ in a heart beat during winter, not towing or anything. Sometimes it simply got there up the freeway on-ramp .... I wished I hadn't fitted the gauges and just "drove" it cause I continually kept watching the gauges from there on in. It's not different on the 4.2 . Although after the CC cooler, the temps are much more tame so not such a bit deal.

[gubigfish]

Would have been interesting to have a comparison on the 4.2 before I fitted my CC cooler, unfortunately gauge and cooler got fitted at the same time.

[nissannewby]

It is a good thing to get egt as high as possible before max torque point. This has the turbo working at its ability. Obviously there are still safe limits to all of this.

@Hodge this is kind of what you saw with the crd. Its not really about having the lowest egts. Like engine operating temperature what you want is stability. So a quick rise to temperature but then to maintain the temperature.

Remember the 500-550 max safe temp post turbo is for short periods not a point to slow down. If the egts get to 500 but plateau there while say climbing a hill or accelerating on to the highway then that is fine.

[drgtr]

It is a good thing to get egt as high as possible before max torque point. This has the turbo working at its ability. Obviously there are still safe limits to all of this.

@Hodge this is kind of what you saw with the crd. Its not really about having the lowest egts. Like engine operating temperature what you want is stability. So a quick rise to temperature but then to maintain the temperature.

Remember the 500-550 max safe temp post turbo is for short periods not a point to slow down. If the egts get to 500 but plateau there while say climbing a hill or accelerating on to the highway then that is fine.

What I noticed since advancing the timing on my td42ti.
It was retarded as so remember I dont know how EGT should be moving as slow was "normal" to me


The EGT get up to its operating point so much quicker. Its steady and then goes back down quickly too.

It hasnt gone higher but I noticed on the gauge it moves quicker.

Is this right or am I seeing things