EGT upper limit?
Submitted: Saturday, Feb 04, 2012 at 20:06
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Member - bungarra (WA)
I have a Land Cruiser 4.5 TD V8 ( VDJ79R ) with a Tunit chip fitted...been all ok since installed some 2 years ago
Now that I have a 3.5 ton caravan to two at times I am more aware of the exhaust gas temp. I have on order an EGT guage and seeking what sort of temp limit I should set the alarm at so as to know when to back off immediately before any damage is done
So can anyone advise the sensible alarm upper limit please and comment on the expected / ideal temperature ranges
Thanks
Reply By: Mick O - Saturday, Feb 04, 2012 at 23:11
Saturday, Feb 04, 2012 at 23:11
When I had the chip and exhaust fitted to the 79 ute, the specialist indicated that 520C was not what you wanted to see on your EGT gauge. My probe is aft of the turbo meaning that things are
well over 100C hotter in the engine than what the probe is picking up.
When tuning on the dyno, he aimed for a setting that would not exceed 480C despite load. I have managed to reach that on a couple of occassions. (Wrote it up in the blog with the Dyno results - last couple of paragraphs)
Ute Build
Cheers Mick
AnswerID:
476904
Reply By: Ozhumvee - Sunday, Feb 05, 2012 at 07:54
Sunday, Feb 05, 2012 at 07:54
You really have to do a search for what your particular engine can tolerate.
As others have said it also depends on where the probe is situated in the exhaust.
I've done absolutely nothing to the Oka and EGT's typically run up to 630 deg C when working hard, that is approx 100mm post turbo so as Mick said it is probably at least 100 deg C hotter in the engine.
That is with standard everything so I assume it is ok as I've yet to find a definative answer for the Perkins engine.
AnswerID:
476933
Reply By: Member - Captain (WA) - Sunday, Feb 05, 2012 at 12:03
Sunday, Feb 05, 2012 at 12:03
Hi Bungarra,
I have an EGT guage post-turbo on my 200. The highest temperature I have seen is 571C, that was towing my 2T van and going up a long
hill and overtaking too with full acceleration for longer than a minute. The temp was still very slowing climbing, but I backed off at this point. So, I am comfortable that the 200 can handle ~570C for short bursts, its what it will do from the factory. I would estimate the 79 series would be very similair in what it could handle.
Since that measurement, I have fitted a
Beaudesert Exhaust and it drops the EGT by up to 50C. I have not yet seen what the max EGT gets to with the new exhaust (by towing up a
hill with full acceleration).
I also have a ChipIt chip. I can turn
mine off/on as I drive and the 571C was recorded with the Chip off. Typically, the Chip adds 30C to the EGT under any condition. The ChipIt connects to my EGT guage and will automatically change the Chip program back to standard if the EGT high alarm is reached, I have
mine set at 565C.
Prior to the new exhaust, on a few occassions the max temp alarm when off, but since the new exhaust this hasn't happened due to the lowering of the EGT.
Cheers
Captain
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476970