EGT TEMP
Will you make something up for me please?
Joined: Sep 2001
Posts: 6,349
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From: SoCal
Re: EGT TEMP (91lude)
Well, it varies on the car, and also where the probe is mounted. Anywho, the temps I see so far looks like they're right on the manifold (before thr turbo).
Mine usually never goes above 1250F. That was before I got everything working. I was running without a working fuel pump and boosting....and was getting near 1500!! Heehee.
Tomakit from HT helped me out.....now my car runs like a dream.
Mine usually never goes above 1250F. That was before I got everything working. I was running without a working fuel pump and boosting....and was getting near 1500!! Heehee.
Tomakit from HT helped me out.....now my car runs like a dream.
Honda-Tech Member
Joined: Jun 2001
Posts: 384
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From: Turboville,, Haulingass, US
Re: EGT TEMP (shamoo)
“ideal” EGT temperature can vary from engine to engine. Usually, 1300 to 1500 degrees F is optimal for normally aspirated engines on gas, while gas turbos will run optimally @ 1500 to 1650.
An important note: this is measured before the turbo, not after, as the turbo will reduce EGT by an average 200 degrees F.
An EGT does not tell you exactly what the mixture ratio is, but it does give you a pretty fair indication of what is happening inside of the engine. If the mixture is rich, the temperatures will be low, and if the mixture is lean the temperatures will be high. There is no exact number to aim for, as exhaust gas temperature is affected by many things. A typical race engine seems pretty happy at about 1650 to 1700 degrees Fahrenheit, and turbo engines seem to run best with temperatures 150 to 200 degrees less.
After installing your gauge, make a run at full throttle in third gear, and monitor the temperatures throughout the rpm range. If for example, the gauge reads 1400 at 4000 rpm, and creeps all the way up to 1850 at 7000 rpm, the engine is running rich at low rpm, and lean at high rpm. At some point in the range, the engine will feel strongest, and the temperature at that point should be your target, give or take maybe 100 degrees. It is normally best to correct the low rpm mixture first, and then correct the high speed mixture.
The best way to "calibrate" your gauge is on the dyno: watch a/f and correspond that to what your EGT gauge is reading. This will then give you a "street" referrence point to base future readings. These gauges are not real accurate, but only general indicators of a/f. a/f gauges arn't good for anything other than show, EGT are much more useful and reliable, but still have substantial limitations and cannot be seriously relied upon for accurate a/f tunning.
If you want your turbo engine to last you should NOT rely on anything OTHER THAN accurate tunning! (dyno, motech a/f, etc)
If you have done the dyno calibration method you at least have a good idea of how accurate you EGT gauge is reading and at what point it is indicating a lean mixture.
[Modified by greyzone, 6:19 PM 11/16/2001]
An important note: this is measured before the turbo, not after, as the turbo will reduce EGT by an average 200 degrees F.
An EGT does not tell you exactly what the mixture ratio is, but it does give you a pretty fair indication of what is happening inside of the engine. If the mixture is rich, the temperatures will be low, and if the mixture is lean the temperatures will be high. There is no exact number to aim for, as exhaust gas temperature is affected by many things. A typical race engine seems pretty happy at about 1650 to 1700 degrees Fahrenheit, and turbo engines seem to run best with temperatures 150 to 200 degrees less.
After installing your gauge, make a run at full throttle in third gear, and monitor the temperatures throughout the rpm range. If for example, the gauge reads 1400 at 4000 rpm, and creeps all the way up to 1850 at 7000 rpm, the engine is running rich at low rpm, and lean at high rpm. At some point in the range, the engine will feel strongest, and the temperature at that point should be your target, give or take maybe 100 degrees. It is normally best to correct the low rpm mixture first, and then correct the high speed mixture.
The best way to "calibrate" your gauge is on the dyno: watch a/f and correspond that to what your EGT gauge is reading. This will then give you a "street" referrence point to base future readings. These gauges are not real accurate, but only general indicators of a/f. a/f gauges arn't good for anything other than show, EGT are much more useful and reliable, but still have substantial limitations and cannot be seriously relied upon for accurate a/f tunning.
If you want your turbo engine to last you should NOT rely on anything OTHER THAN accurate tunning! (dyno, motech a/f, etc)
If you have done the dyno calibration method you at least have a good idea of how accurate you EGT gauge is reading and at what point it is indicating a lean mixture.
[Modified by greyzone, 6:19 PM 11/16/2001]
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