Cool down time
#3
Brother of the Rotary
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I don't have a dry T04B. But with my SR KKK I do the following:
-No boost the last few miles before I know I'm going to stop.
-For short stops, I will usually let the car idle for about 2 minutes.
-When I put the car away for the night, usually about 3-5 minutes. (I do that with the hood up and e-fan running to get as much heat out of the engine bay).
-No boost the last few miles before I know I'm going to stop.
-For short stops, I will usually let the car idle for about 2 minutes.
-When I put the car away for the night, usually about 3-5 minutes. (I do that with the hood up and e-fan running to get as much heat out of the engine bay).
#7
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Originally Posted by FC_mania
Could i know how long its necessary to cool down a dry center T04B during idle?
thanks a lot
thanks a lot
Originally Posted by RETed
Get an EGT gauge, and it'll tell you EXACTLY when you can shut the engine off.
-Ted
-Ted
I don't see how EGT is going to tell you anything about the temperature of a fluid bearing in the CHRA. I think an oil temp gauge on the oil return from the turbo, or an IR temp reading of the center housing would be a better indication.
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#8
Brother of the Rotary
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Originally Posted by RETed
Get an EGT gauge, and it'll tell you EXACTLY when you can shut the engine off.
-Ted
-Ted
Last edited by eViLRotor; 03-06-05 at 12:44 AM.
#9
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EGT's is a direct correlation to "engine temperature".
Now, the term "engine temperature" is such a vague phrase, but we are worried about proper cool down.
I realize we are worried about the temps of the turbo (oil), but if the turbo temp is abnormally elevated, it should induce higher than normal EGT's.
For example, my EGT at idle is 480C on a GReddy 60mm P/H EGT gauge.
When boosting hard, the idle will sit as high as 600C - 650C.
I normally wait till the EGT's drop down to at least 500C before shutting the car off.
Now, after boosting hard, it does take at least 1 to 2 minutes before the EGT's start to drop down to 500C, even after hitting as high as 650C.
This seems to be consistent with other cool down procedures...
-Ted
Now, the term "engine temperature" is such a vague phrase, but we are worried about proper cool down.
I realize we are worried about the temps of the turbo (oil), but if the turbo temp is abnormally elevated, it should induce higher than normal EGT's.
For example, my EGT at idle is 480C on a GReddy 60mm P/H EGT gauge.
When boosting hard, the idle will sit as high as 600C - 650C.
I normally wait till the EGT's drop down to at least 500C before shutting the car off.
Now, after boosting hard, it does take at least 1 to 2 minutes before the EGT's start to drop down to 500C, even after hitting as high as 650C.
This seems to be consistent with other cool down procedures...
-Ted
#10
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how long does an egt usually last? i mean the sensor.....and does the reading differ if it was put on the downpipe or manifold?
so i should let it sit until 500C and below?
so i should let it sit until 500C and below?
#11
Rotary Enthusiast
Two or three minutes of cool down should be plenty. Again it all just depends on how you were driving, evilrotor and evil aviator pretty much hit the nail on the head. Just watch the egt guage and see where it levels off at. The further downstream the egt probe is in the exhaust the cooler the temps you will see.
#12
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Originally Posted by FC_mania
how long does an egt usually last? i mean the sensor.....
We've had one sensor fail due to debris hitting the sensor and splitting the SS "sheath".
[QUOTE]and does the reading differ if it was put on the downpipe or manifold?[QUOTE]
Yes.
On average, the GReddy differs about 40C on downpipe versus turbo exhaust manifold placement.
So i should let it sit until 500C and below?
Typically, 500C is a good idea temp to shoot for after driving the car hard.
-Ted
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