Hi All. What is the high limit of the TD42 EGT.
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Hi All. What is the high limit of the TD42 EGT.
Anything over 500 degrees is getting on the high side mate.
Especially over 550.
Something that I have always wondered was... 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.....
You never (or very rarely) see vnt turbos on petrol vehicles because of the hotter exhaust gases, which are known to kill the vnt setup...
I understand the block heat still has an effect, but just thought a 4.2 (or even a 2.8) would be more reliable at a hotter egt.
What do others think?
And for the record, I never allow mine over 550. Everyday driving sees me around 250-400
Is the degree celsius or fahrenheit
definately no more than 550 degrees C and that is post turbo or after turbo
mine is 315 at 110km/hr on 14lb's of boost and it is 550 on 17lb of boost at 170km/hr flat to the board riding the brake.
I only know this as i had the diagnosis 'box' on my lap as the diesel tuner was drivin, he was very happy with it and said it was one of the most lively 4.2's he has ever driven....gotta be happy with that!
Steve.
EDIT- mine also has a Denco turbo with a 3 inch pipe from dump to tip with no muffler, as soon as the tuner took his foot off the floor ( lifted 1/2 inch on pedal) it dropped to 475 degrees pretty much instantly, we were workin it out as hard as we could to see how far it would go.
All the trucks I drive (semi's, Rigid's when fitted with a egt gauge) all run to 600 deg c. It dosen't matter what engine or what turbo any more than 600 & things may start to go pear shaped. Most say no more than 550 deg c just to be on the safe side. I run my TD42 to 550 deg C all the time, have done for the last 2 years without any drama's.
Pyro sender is just after the hot side on turbo in the dump pipe.
Cheers Jono.
Yep i can get mine to 550 merging onto the freeway! 15psi and post Turbo in the Dump pipe, 3" exhaust all the way. No Dramas.
I have never got mine past 450 c 13psi 3" exhaust turbo to tip no muffler
tickle the fuel up!!Quote:
Originally Posted by Ben-e-boy
Steve.
my gu patrol is auto with 3inch pipe non intercooled at the momentQuote:
Originally Posted by -ET 4wd-
its running 14psi boost standard turbo
gave fuel about half a turn from standard and on the hills its max temp is 500degc post turbo about 50mm away from turbo.
do you think there is much more room for more fuel?.
are these boost levels safe for standard turbo?
cheers guys
10 lb boost sits on 350/400 at 110k around up a decent hill 500 at 16lb sometimes just over 500 but not often
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.Quote:
Originally Posted by guterra
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.
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.
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
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.Quote:
Originally Posted by Hodge
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.Quote:
Originally Posted by 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.
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.Quote:
Originally Posted by nissannewby
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
Might be starting to overthink things mate. Aim to keep your max egts under 550c and you'll be fine. The rest is for smart cookies with a dyno to worry about.Quote:
Originally Posted by drgtr
Thank you. I totally agree!Quote:
Originally Posted by 0-TJ-0