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I had to have my exhaust manifold removed to replace the infamous 9000 broken manifold studs. While it was off, I had my mechanic install the thermcoupler in the area where the #3 and #4 (counting left to right) exhaust outlets come together in the stock manifold. I am mow essentially measuring the combined temperature of two of the exhaust runners. There was no way to fit the Autometer thermocoupler in the manifold collector as some suggest becuase the probe is too long and you do not want it touching the manifild which will result in false measurements.
After a day of variuos driving conditions, I now realze just how transient the exhaust gas temperatures can be. Here are my initial observations:
Idleing 10 minutes after cold start: steady 975 degress
Idleing a few minutes after completeing normal driving: 1000 degrees
Normanl steady-state highway driving: 1200-1350 degress
WOT like adaptation run: up to 1500 degrees
Keep in mind that I am producing 20-24 PSI during WOT as well.
The high temperatures (>1400) concern me although they are short lived. About 15 seconds after driving the EGTs up to approximately 1500, EGTs quickly fall back to what I consider normal operating temperatures. The problem is I do not know what normal is. With no previous experinece in measureing EGTs and no other 9000 to compare my EGTs with, I have no way of knowing if my EGTs are too high, which could indicate that I am running too lean. It is also my understanding that EGTs above 1400 have a cumalative damaging effect on the aluminum engine parts and can actually distort the shape of the turbo fan blades.
Does anyone have any experience in measureing EGTs? I would like to compare data with another 9000. Any insight you guys might have would be very much appretiated. With all the Saab tuning that takes place here, I am surprised more folks are not monitoring EGTs.
Thank you,
Steve
posted by 68.34....
, Sun, 19 Feb 2006 19:56:52
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