CRD Max EGT?

[Rock Trol]

I just drove the Patrol up the Sturt Hwy to Callington and back. Its a 40 degree day here in Radelaide. Diving around town the EGT was between 200-300 degrees which is fine. On the flat (freeway) it can get up to around 400 degrees before dropping down to around 350.

Going up the big hill to the tunnel was interesting though. Fourth gear and car felt good but the EGT's got to 600 degrees (alarm sounded from the gauge) and I backed off a little. In no way was I pushing the car but it tended to sit between 550-600 on any of the long hills (5th or 4th gear no difference). On the flat its fine. Also coming off the ramp on to the freeway (flat) I had to give it a bit of stick so I could merge into traffic and again it hit the 600 degree mark.

The Patrol has a Cross Country Intercooler, 3 inch Exhaust and NADS so boost was always around 14.5-15 psi when under load. It has also had the ECU remapped. There was power there but I just felt I could not use it due to the EGT's.

This all happened with the Patrol empty and not towing. If I had the camper I think I would have had to go down to 3rd which defeats the purpose of the ECU remap (more power).

I have a couple of questions:
1. How much difference does the air temp have on EGT's? If it was a cooler day would it have been a lot better or only slightly.
2. What is the max EGT's that a CRD will tolerate. I get the feeling 600 is too low as it gets there very quickly. Or is there something wrong with the tune?

[the evil twin]

1 - In between IE better than slightly but not as much as a lot.

2a - Post turbo EGT depends on a lot of variables the answer could be between 500 and 700
2b - The rate of change of the combustion temp will have no relationship with the allowable peak combustion temp
2c - Tune is probably fine for performance and crap for towing or vice versa, only a Dyno will tell.

I reckon your boost is to low as well.

[threedogs]

low boost and position of your probe could be the problem.
The CRD can handle slightly higher temps too than a Di
A dyno may sort it out
Mego could tell you how high a CRD will go towing

[Maxhead]

I get 600+ when towing all the time and have now stopped worring about it. Matter of fact I might even disconnect the EGT gauge as it pisses me off!
I've seen that many Patrols rolling around Australia towing big rigs and totaly oblivious to any issues with them and totaly happy with the vehicle,

[the evil twin]

I get 600+ when towing all the time and have now stopped worring about it. Matter of fact I might even disconnect the EGT gauge as it pisses me off!
I've seen that many Patrols rolling around Australia towing big rigs and totaly oblivious to any issues with them and totaly happy with the vehicle,

Couldn't agree more...

[Rock Trol]

Thanks Nisshead. So it's not just mine.
As far as boost goes, what does yours run at. Mine runs at about 30 MAP or 15 psi max.

Ideally, what boost should be run when under load?

The EGT probe is just after the bend in the pipe behind the turbo.

The guy that tuned it said that 700 degrees would be the max for a CRD. Keep in mind that CRD's also inject fuel late into the combustion process to promote turbo spin so some of that heat has been added during the exhaust stroke rather than the main combustion stroke.

[kevin07]

ive gone close to 8 hundred but as was said lot of stockers towing pretty big stuff around don't seem to be having blown motor issues. but are having warped manifold issues which could be having an effect on your egts, mine did. also you could add a bigger scoop I did and lowered my egts only between 50 and a 100, but all helps.

[Rock Trol]

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.

[the evil twin]

I'd set the alarm for 700 maybe even 750 and drive it to under 500 tooling around and 600-650 towing.

[Hodge]

I get 600+ when towing all the time and have now stopped worring about it. Matter of fact I might even disconnect the EGT gauge as it pisses me off!

I've been thinking about doing this for a long time. What you can't see won't hurt ya can it ? Then just drive the freakin' thing.

On topic...
Mines been 600+ before exhaust, EGR block, bigger IC and dyno tune and chip .Since then, I am yet to push it past 550C, and that was when I was really putting the foot down. I don't tow or anything to maybe thats why. But generally it sits 300-350 cruising, 400-ish on a incline or small hills.