CRD Max EGT?

[Rock Trol]

It was only on the big hills that it was going up to 600. This was just outside of Adelaide heading to Melbourne through the tunnel. It's in an area where a lot of trucks have lost brakes going the other way. Big hills that go for a long way.

When on flatish normal roads (heading north of Adelaide towards Port Augusta) or small undulating hills it keeps under 400 at 100kph. When the ECU upgrade was done last December I towed the camper up the same hills (without EGT gauge) and was able to keep it in 4th without problems. Before the tune and exhaust it would not hold 4th and I would do it in 3rd (55kph).

So maybe I don't actually have problem. It's just me freaking out at the temps on the gauge. I can still go up that hill in 3rd if need be when towing to keep EGT's down. Will be towing to the Riverland in a couple of weeks so will be interesting. Not many big hills but I will get a baseline on temps.

If I can get a little more boost what should I set it at? 18psi?

As a few have suggested on this thread, maybe we CRD owners need to chill out a bit and drive them without worrying. There's a lot of baggage linked to the ZD30 that's for sure.

[kevin07]

Thanks Kevin. My manifold had warped and broken a stud with the stock exhaust. Hopefully the 3 inch will keep it cool. Might set the alarm to 650 or 700 degrees C as it sounds more realistic than the 600. I have a larger intercooler with a 10 inch fan so I am confident that its getting air through there.

You won't need to worry about that anymore with the big V8 under the hood. Petrol as well so no EGT issues. Mmm...maybe I need to rethink a few things.

as et has said 750 should ok but not prolonged at this temp but tell me is your fan under your I/c or on top

[kevin07]

It was only on the big hills that it was going up to 600. This was just outside of Adelaide heading to Melbourne through the tunnel. It's in an area where a lot of trucks have lost brakes going the other way. Big hills that go for a long way.

When on flatish normal roads (heading north of Adelaide towards Port Augusta) or small undulating hills it keeps under 400 at 100kph. When the ECU upgrade was done last December I towed the camper up the same hills (without EGT gauge) and was able to keep it in 4th without problems. Before the tune and exhaust it would not hold 4th and I would do it in 3rd (55kph).

So maybe I don't actually have problem. It's just me freaking out at the temps on the gauge. I can still go up that hill in 3rd if need be when towing to keep EGT's down. Will be towing to the Riverland in a couple of weeks so will be interesting. Not many big hills but I will get a baseline on temps.

If I can get a little more boost what should I set it at? 18psi?

As a few have suggested on this thread, maybe we CRD owners need to chill out a bit and drive them without worrying. There's a lot of baggage linked to the ZD30 that's for sure.

when I was towing my camper up mt ousley nsw with the camper on 1.4 ton giving it a good kick I was at 18 psi boost and it was all good so I cant see why setting to 18 would be a problem

[Rock Trol]

Thanks Kevin. Fan is on the underside of the intercooler.
I will also adjust Dawes valve to allow a little more boost. Peaks at about 17-18 but settles down to just under 14-15 when under load and around 12 when cruising.

[Rock Trol]

I had a play with the Dawes valve after work and went for a drive north of Adelaide on the highway. I started off to a max of just over 19 psi and the car was going gang busters. Acceleration was great and EGT's where low. I thought I better lower it a tad though and have settled at 18 psi under heavy load (foot to floor) and around 16 under moderate load. When on the flat and at a steady speed the boost sits around 14psi. Yesterday it would peak just under 15 and sit on 12 when on a steady speed on flat ground.

Basically I have added 2-3 psi over what it was originally running. Car does feel good. Will have to drive up big will on weekend to get a feel of what it will do. Sitting at a steady speed on highway I was 300-350 degrees on the EGT gauge. That's 50 less than last time.
The only time I got near 600 was when I planted the foot to the ground in 4th gear and kept it there. This is not how I normally drive so not too worried.

Should I keep it at this boost (18psi max) or go a tad higher to 19 as I originally set it at?

[Rock Trol]

I have just returned from a run up the highway to Hahndorf (big hill) and the car ran a lot better and cooler than it did last Sunday. It was around 30 degrees (instead of 40 like last weekend) and the car kept to around 500 degrees. If I pushed a little harder I would get it to 550 and when I eased off it would drop under 500. The boost would vary between 16.4 and 16.9 depending on the situation. Last week boost was maxing out at the mid 14's under the same speeds and load. An increase of 2 psi has let the car run cooler and it felt faster as well.
Not sure how much the cooler weather played in this though.

Will be interesting to see how it runs with the camper behind it up the same hill. Having read a few threads on this forum and the other Patrol forum I feel confident that anywhere under 700 degrees is OK for a CRD. I will try and keep it under 600 if I can though. I do not think the ECU retune is making a big difference in EGT's as my temps are line ball with a lot of other CRD owners, even people with stock vehicles. It's only when I plant the foot to the floor that it starts getting hot quickly.

All in all, I am much happier with the higher boost this week than I was last week running lower boost.

[Patrol-Guy]

Got my GU serviced before my Lithgow trip last week and noticed the EGT's topping out at 600+ and boost only reaching 10psi. Stopped and changed it up to 19psi and going great.

Why the mechanic would drop the boost is beyond me. Probably the apprentice stuffing around. Anyway my EGT's were pretty good after that.

Also agree that too much attention is given to the ETG temps. I might change my alarm to 700deg also.

[MEGOMONSTER]

My temps were often getting 600-650. Not much difference towing or not.
My alarm is at 700.
I have alarmed once only, so I try not to get there.
I have now a 3" exhaust. Larger intercooler, larger scoop.
It has dropped temps between 50-80 degrees.
I now hardly ever see the 650 and I guess now peaks at 600ish.
The CRD has always been high EGT's especially after adding more and more to the vehicle, larger tyres the biggest culprit.
Still to fit Dawes to help with boost.

[Rock Trol]

Reading up on the CRD's and they deliberately run hotter as an aid to lower emissions. By injecting fuel late in the combustion cycle they heat up the gases so that the CAT can be more efficient at burning off the nasties. This is why they register higher temps than Di's. EGT is just not as accurate an indicator of what is happening inside the cylinder of a CRD compared to a Di. They can probably go over 700 deg safely but its probably a good self imposed limit we can use.

[the evil twin]

snip... EGT is just not as accurate an indicator of what is happening inside the cylinder of a CRD compared to a Di.

Post Turbo EGT readings aren't an accurate indicator of what is happening inside the cylinder of any internal combustion engine.
Pre Turbo is much, much better at giving an indication of cylinder combustion temperature which is what we are trying to control.

Most of us don't use pre Turbo because it is a harder install and we are lazy buggers so we just cop the inaccuracies of the variable temperature drops across the Turbo, probe placement, exhaust mods etc.