what are high egt's

[sapki]

okay guys got a gst with a 16g, greddy fmic, injen intake and k&n fpik, hks ssq, apexi dunk exhaust, 650's, 255lph, safc, egt and boost gauges, and a profec b spec 2. it hits about 1300 on the egt at about 50% throttle on the freeway. oh yeah has a hks external i think 34mm and a atmospheric dump. any help would be greatly appreciated.

 

[spirol]

EGT or exhaust gas temperature is a sensor that detects the temperature of your exhaust gas after combustion. High EGT's can result to detonation/ preignition which can cause knock. Running lean can cause high EGT's. EGT's can be lowered by putting more fuel since fuel is also design to cool the engine.

 

[eckorulez]

running rich can also cause high EGT'S

-Colin

 

[alex99gst]

running rich can also cause high EGT'S

-Colin

Actually, its weird how it works, but the less fuel, the hotter the air, but the more fuel there is some of it stays unburnt and actually is cooler than a lean mixture. The unburnt fuel is carried out and keeps it cooler than if it was all burnt up. This is why the car automatically runs rich when the mas is unplugged or when your oxygen sensor dies. It tries to protect the engine by reducing knock/detonation and going super rich. Leaner mixture = higher EGT's, richer = lower EGT's

 

[CanadianTSi]

1600 is starting to get too hot.

 

[paul s]

1650 is very hot.

 

[Jaraxle]

Most EGT's gauges are not accurate. As mentioned somewhere else, just because you hit 1600, doesn't mean you melted something. Also, at part throttle, your engine is going for 14:1. I've seen over 1400 cruising. I just dyno'd my car last week. Since I know my A/F, I noted the EGT's, and now I can use future EGT's as a reference. Just use it as a reference, not a rule.

-Jaraxle

 

[blcknspo0ln]

I think you guys are all missing the point of what the EGT is offering you. It is NOT a tuning tool, it is a warning meter. The only way to "depend" on your EGT's is if you are running a wideband all of the time or if you have just been recently tuned. This way, on a good tune (11.5-11:1 to be safe) you will know what your "safe EGT" temperature is. This way, if your temperature display runs hotter, you will know something is going on. Using that notion, It doesn't matter if your EGT probe is mounted in cyl 1 -4 or in your downpipe. Whatever consistent temperature you have when properly tuned is the number you should be dependant on. It doesn't matter if it is 1400C - 1700C. However, 1650 is on the hot side.