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EGT question...

What is the maximum acceptable EGT on our cars? And what should be the "normal" EGT that we should see under extended period (>5 sec) full boost situations?

thanks!
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Old 11-05-2009, 05:09 PM
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Old 11-05-2009, 05:52 PM
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LOL, there is no way I can look at my EGT gauge with this thing on full boost, the grin on my face gets in the way. The most I can recall seeing on mine is slightly over 1200 with the probe just proximal to the turbo but I can't datalog this yet.
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Old 11-05-2009, 06:06 PM
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At 1200 deg. you are on the edge of sezing a piston. I am not sure on a porsche ,bit the melting point of the alum. is some where arount 1300 deg.
Old 11-05-2009, 06:11 PM
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Quote:
Originally Posted by sjf911 View Post
LOL, there is no way I can look at my EGT gauge with this thing on full boost, the grin on my face gets in the way. The most I can recall seeing on mine is slightly over 1200 with the probe just proximal to the turbo but I can't datalog this yet.
For EGT, the probe should be right around the exhaust port - a few feet (ok, maybe 20") from it would give false readings?

And, when you say 1200, you mean degF?
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Old 11-06-2009, 05:56 AM
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Quote:
Originally Posted by 964 T #304 View Post
At 1200 deg. you are on the edge of sezing a piston. I am not sure on a porsche ,bit the melting point of the alum. is some where arount 1300 deg.
You cannot compare EGT of hot gas to melting point of material. Flame front of exploding gas mixture in the combustion chamber has much higher temperature than melting point of cylinder walls. But cylinder walls will not melt as there is a thin sheet of cooler gas protecting the cylinder walls.

A good rule of thumb is not to exceed 900 deg C , measured at turbine intake. Modern turbochargers with Chromium-Nickel cast exhaust parts can exceed 950 deg. C even in normal operation. But 3DLZ isn't up to this so <900 deg. C should be OK.
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Old 11-06-2009, 06:46 AM
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Quote:
Originally Posted by hobieboy View Post
For EGT, the probe should be right around the exhaust port - a few feet (ok, maybe 20") from it would give false readings?

And, when you say 1200, you mean degF?
Correct, degrees F. I wish I could datalog the temps because it is too dangerous to try to monitor the EGT while street tuning without a passenger. I have a hard enough time watching the boost gauge. I put my gauge in mostly in anticipation of dyno tuning which hasn't materialized yet.
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Old 11-06-2009, 03:00 PM
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If you run the egt on a 18 wheeler diesel engine @ 1200 deg on the pyrometre it won't run long without gaulding pistons. If you run a racing 2 stroke engine @ anything over about 1250 deg. on egt and you will melt pistons and Nicom linners also as I have done on unlimited outboard drag engines lots of times.
Old 11-06-2009, 03:43 PM
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We run our 935 clone with max egt of about 1550 F. Never had a problem melting pistons etc.

NA engine peak at a bit less.

The probe should be within 6 in of the exhaust port, the closer the more accurate reading.
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Old 11-06-2009, 04:15 PM
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Goran's comments on 900degC ~= 1700degF but Tim's number seems to jive more with my reading - I do see 1550-1600degF on mine (though I'm trying to find an accurate way to calibrate my sensor which I have NOT done).

I recall hearing that our engine can take up to 1500degF or 1700degF so would like to see if high 1500's is ok.
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Old 11-06-2009, 04:56 PM
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During initial tuning, I had temps up to 1575, but brought them back to around 1525 to meet 12:1 AFR with 18 degrees timing and 6800 rpm. The EGT was not really a factor of tuning though. The next motor on the DTS dyno was a 3.6 NA motor that ran in the mid 1600's (about 12.5:1 AFR) when completely tuned.
Old 11-06-2009, 05:30 PM
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Mine run 1300-1500. Never seen above 1500 so far.
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Old 11-06-2009, 06:08 PM
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