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Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

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Old 12-01-2012, 01:13 PM   #1
98jdmlegacy
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Default exhaust temps... correct reading or no?

i have an 02 wrx my exhaust temperature raises really fast when driving. the sensor is mounted in the up-pipe which i know most people say to mount it on the header. the highest i let my temps get is 1400 degrees which seems like its getting high. but too the point i can literelly watch my temp gauge go up as i drive. even when i rev my car at idle it goes up. im wondering if its reading wrong or possibly the probe is touching the up-pipe
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Old 12-01-2012, 10:45 PM   #2
02nismokiller
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No it's reading correct, at idle the rpm's are low which means less firing of the pistons which in turn means less heat than when the engine is at 4k rpm's and the pistons are moving ridiculously fast which produces lots of heat and the temps will go up to or more than 1400* at the piston. By the time the exhaust reaches your probe at the uppipe, the temps are much lower than if your probe was at the header near the block... Soooo in other words, your 1400* that your seeing in the uppipe is really like 1500*
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Old 12-03-2012, 01:41 PM   #3
98jdmlegacy
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ya and i dont believe the temps are supposed to be that high going into the turbo. In the header i can understand that high. My old tune never saw above 1000 degrees
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Old 12-03-2012, 03:10 PM   #4
djdalaney
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Originally Posted by 98jdmlegacy View Post
ya and i dont believe the temps are supposed to be that high going into the turbo. In the header i can understand that high. My old tune never saw above 1000 degrees
It is normal to see EGTs up to about 1650 in turbocharged applications. Above that, and you should be worried about it. Below that, you're fine. I know this is a totally different car, but in my Speed3, I would see 1400-1500 EGTs consistently when driving up mountain roads.

If you're capable of tuning yourself, running the car richer should reduce EGTs if it worries you.

Last edited by djdalaney; 12-03-2012 at 03:17 PM.
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Old 12-03-2012, 03:42 PM   #5
rkramer
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It is normal to see EGTs up to about 1650 in turbocharged applications. Above that, and you should be worried about it. Below that, you're fine. I know this is a totally different car, but in my Speed3, I would see 1400-1500 EGTs consistently when driving up mountain roads.

If you're capable of tuning yourself, running the car richer should reduce EGTs if it worries you.
1650 in the exhaust manifold 3 inches from the valves. 1650 in the uppipe would be only momentary, as the remains of your valves would be hitting the blades of the turbo!

IIRC, 1400-1450 at the uppipe or so is roughly the same as 1600-1650 in the manifold.
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Old 12-03-2012, 03:55 PM   #6
rocketperson7
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you can also use your O2 sensor for a too hot warning
http://www.romraider.com/forum/viewt...hp?f=33&t=8134
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Old 12-03-2012, 03:57 PM   #7
kellygnsd
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Are you stock? Knowing what your mods and level of power are would help. On my old hybrid I would kiss 1750 F on good pulls in #3 cylinder 3 inches from the head.
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Old 12-03-2012, 06:51 PM   #8
98jdmlegacy
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haha ya my bad. ive got vf22 turbo, walbro, 750cc inj, stock intake, sti intercooler, turbo back exhaust and a tune.
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Old 12-04-2012, 12:53 PM   #9
car_freak85
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Are you stock? Knowing what your mods and level of power are would help. On my old hybrid I would kiss 1750 F on good pulls in #3 cylinder 3 inches from the head.
This is where EGT readings should be taken, as close as possible to the combustion chamber on the cylinder most likely to see high temps, cylinder #3. You're interested in the temps seen by the piston, valves and chamber, not what is going into your turbo.

My suggestion would be instead of taking somebody's guess at temp differences from exhaust port to uppipe, just put the probe in the correct spot and be done.
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