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Old 03-24-2002, 11:22 AM   #1
wrxspeed
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Question What is a safe EGT temp?

Read all the threads no clear answer.

What is a safe EGT (on the upper end) for our cars?


I seen 1600f (and climbing-autometer egt only goes to 1600) last night at 117mph in 4th with .11 boost on 93 octane fuel. M2 uppipe is only temp helper.

Please don't respond with "theory" only if you have a clue.
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Old 03-24-2002, 02:53 PM   #2
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Theres really no answer here, most egt gauges have a 1650f/900c "redline" and thats what most people go by.
Normally if your going past that your probably running too lean and getting too much timing retard and loosing power.
If you want to be a dear and go past that and tell us that you put a hole in your piston, then by all means do so.

Personally my dsm is tuned to around 800-825c, anything past that and im getting knock and my timing is being pulled.
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Old 03-25-2002, 09:56 AM   #3
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Does anyone here have a clue? Subaru tech maybe? Or tuner by trade?

How hot is to Hot? - EGT's?
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Old 03-25-2002, 12:53 PM   #4
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aluminum melts at around 1700, so there are a lot of people that say 1600 is safe, but I like to think of this as a little close

picture plastic- yea, it melts at a certain temp, but approaching that temp, it'll bend and become pliable, so the same concept would apply to aluminum as well.

so you have the egt probe connected through the uppipe- if you do, I would even add some temp to that figure, just to be safe.

that's all your running and you got that temp? no boost controllers or anything like that?

my random thoughts

speed safely

Brian
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Old 03-25-2002, 01:35 PM   #5
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Depends where the probe is installed, and what probe you ahve, but assuming its a good quality one and in the #3 runner of the exhaust manifold, 2-6 inches from the head, we tune to a highest temp of 800C, or about 1500 F at the top of third gear...lean enough to make good power, rich enough to keep everything nice and happy...and together
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Old 03-25-2002, 01:48 PM   #6
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I've got my Defi proble installed about 6 inches outside the #2 cylinder, an the highest I've seen is 1550F under at about 15 PSi in 4th gear. Everything stock.

Tim
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Old 03-25-2002, 05:35 PM   #7
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so i guess if a probe was installed at the bottom of the downpipe, the gauge would be giving a bunch of crap data, right? i just had it installed today and the gauge is VERY slow, nothing like any videos i've seen of EGT gauges... (60mm greddy)
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Old 03-25-2002, 05:40 PM   #8
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God has his on the DP when he made 311 RWHP and he says no more than 1,400 is the safe margin.

Leo
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Old 03-25-2002, 07:26 PM   #9
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i had a 1600 reading in my egt at around 15lbs... what can i do to lower it?
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Old 03-26-2002, 03:38 AM   #10
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I have stage zero and still get high egts, so unichip wont do it fully. you have to eithe tap dance between high egts or detotontion. I just shift when it gets to hot ,change yorudrivng style.
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Old 03-26-2002, 04:00 AM   #11
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Quote:
Originally posted by odyss3y
so i guess if a probe was installed at the bottom of the downpipe, the gauge would be giving a bunch of crap data, right? i just had it installed today and the gauge is VERY slow, nothing like any videos i've seen of EGT gauges... (60mm greddy)
Yep thats about the worst place in the world for the probe. Might as well put it in the trunk at that point.

I put mine in the manifold just under #3. My max EGTs were about 910C a few short times long ago. My heads had cracks in them on the combustion chamber where the spark plugs come in... Seems 900C may just be a bit hot

The car seemed to make the most power at around 840-850C. Anything higher was just lean.

-Nathan
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Old 03-26-2002, 10:31 AM   #12
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Quote:
Originally posted by Slvrblt
aluminum melts at around 1700, so there are a lot of people that say 1600 is safe, but I like to think of this as a little close

picture plastic- yea, it melts at a certain temp, but approaching that temp, it'll bend and become pliable, so the same concept would apply to aluminum as well.


Brian
the melting temperature of pure aluminum might be 1700F but we're talking about an alloyed aluminum. The material is safe past 1600F. Just realize that the longer you spend at that temperature, the faster diffusional breakdown of the material will be (heat speeds diffusion). If you're cruising on the highway for an hour at 1600F, then YES you ARE doing damage. But if you take the car up to 1700F just once for a couple seconds, then you're probably not really damaging anything, as long as you give it a cooldown afterwards. By cooldown, i mean coasting in gear with no throttle applied. That will really suck the heat out of the exhaust.

Remember that even though your exhaust temp might be 1600, that DOESN'T mean that the material in the engine block is 1600F. Heat transfer from gas to solid is pretty slow.
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Old 03-26-2002, 11:11 AM   #13
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My car must be a freak cuz I only get 800c max and that only happens uphill at full boost. I got the Greddy EGT with the probe in cylinder #3. Mods are TXS stage 2 w/ up-pipe and mbc. I guess thats nice, clean, safe power!
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Old 03-26-2002, 12:41 PM   #14
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same here, i hit 750c uphill WOT in 5th... i have a CAI also which i'm told should raise egt's.
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Old 03-26-2002, 04:32 PM   #15
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with a spring-and-ball type MBC or TurboXS Stage2, you'll actually hit the highest temperatures at less than wide open throttle. I can cruise along at about 80% throttle or so (full boost) and the temp climbs rapidly but as soon as i floor the throttle, the temperature drops and stabilizes around 1450F.
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Old 03-26-2002, 04:35 PM   #16
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ya, in 5th on levelground i could only raise egt's by barely using the gas, boost was around +.5 bar, once i started going uphill WOT was the only way to raise the egt's
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Old 03-26-2002, 05:19 PM   #17
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what is it in the stage two that is reducing temps so much as compareed to stage zero and stage one?
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Old 03-26-2002, 05:31 PM   #18
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Hello,

We measure EGTs off Cylinder One, which is the last cylinder on the fuel rail, and thus the one most likely to go lean and have the highest EGTs. We expect, within 4 inches of the exhaust port in for Cylinder One, EGTs of 1550-1600. That's what we consider a normal peak temperature to reach, depending on your fuel (race gas seems to run about 50 degrees colder than 91 octane). That's what our customers report (those who have mentioned EGTs). Remember that the engine is liquid cooled and water does a great job of pulling all that heat from the block. Higher than about 1600ish is starting to get a little hot for our tastes, but remember that some gauges read high when it's cold out.

On the race car (www.teamsmr.com), we see extended periods (races or practices that last 20-40 minutes) of 1550 degrees. These temps pretty much last all the time since the car is at WOT most of a race. The last time we took the motor out, the heads had no signs of any heat-related damage. Overheating is pretty obvious in aluminun so we're comfortable knowing that probably none of our customers will "test" the effects of high EGTs like the race car - and if they do, the race car has shown us that those temps are just fine.

Joel
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Old 03-26-2002, 05:52 PM   #19
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God I love iclub. Thanks Joel.

I have mine 3 - 4 inches from the the #2 piston. I get my highest egts when I'm partial throttle, about 1450 - 1500 F. I run 94 octane gas all the time
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Old 03-26-2002, 05:58 PM   #20
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thx joel. hurry up with stage one damnit!
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