How Hot is to Hot?

[christo]

I have an exhaust temp installed post turbo on a 2005 Duramax, but as close to the turbo as possible.
I pull a 14000lb 5th wheel and will often see the exhaust temp reach the 1000 deg. point.
Is this to high on a sustained basis?
Talked to two preformance dealers today;
one said 950 max, the oter said 1050 max is OK.
I'd like to your opinions.

Christo

[dmaxmule]

christo, I wonder myself what temps are going to hurt my engine as I just put gauges on my truck also. However, it is not unusual for my egt temps to reach 1000 without a trailer. I think most of the knowledgable people on this site think that 1000 is ok but not to exceed 1350 for more than a few seconds. I think I remember several guys posting temps of around 1400 and even some posted higher temps. I think that they all said not to hold those temps for very long.

[Kennedy]

Post turbo is much more difficult to judge, but we've seen stock LLY trucks run up to 1400

[christo]

John, thanks for the reply.
If I moved the probe to pre-turbo what do you think the max. SUSTAINED safe temp. would be?

Christo.

[madmatt]

I've found you loose about 200* across the turbo. I run one both before and after. I'd say sustaining temps above 1400 for long could be damaging to your engines health. I've seen 1350 out of stock LLYs.

[Diesel Crat]

1400 pre or post turbo and does the same apply whether it's a LB7 or LLY? I'm ssuming pre since most power boxes defuel around 1250 and above.

[madmatt]

pre.

[NJDMAX]

I got back from a 1200 mile trip with our boat(12,000lbs.)The exhaust temp I saw were max 1100deg. pre-turbo with the ac on and running about 75mph. I have a 2002 K3500.

[madmatt]

lb7 egt's run cooler.

[dakotakid]

I pulled the new camper home last week from the dealer. Cruise set at 69 mph and bucking a bit of a wind. On level 0 my egt's were around 1205, when I switched to level 1 they jumped up to 1255. It was the 1st pull I have done since installing Edge/Juice - I was surprised to see them run that high on level gound! I won't even tell you what the mileage indicator said...

Pat

[mark45678]

About a year ago there was a post to a link to Garret's web page. In the text to the link it was stated the turbo was designed to deal with a max of 1400* pre turbo on the LLY . at this point the housing will begin to stick and maybe not change geometry????? 1350 sustained temps was ok. the LB7 I think will deal with much more heat then a lly. IMHO

[Ray Sharpe]

Puting the sensor to close to the tubro will give you a fals reading. The best spot is right in the exhaust manifold. The turbo can read 100-300c higher do to enegy build up in the turbo.