Whats causing high EGT's on throttle lift off?
10-09-2006, 03:38 PM
#1
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Whats causing high EGT's on throttle lift off?
Was driving on the dual carrigeway and went from 70-120mph in 3/4 throttle.
During the accelleration EGT's was around 750 C but when I lift off the alarm light went off so I looked at the EGT and it was sky high. Peak recall revealed it had been up to 900 C. (measured after the turbo)
I thought fuel was dumped in upon throttle realease to prevent high EGT's so what could be the cause of it? Perhaps I just was lucky and released the throttle at the same time as it went sky high, therefor thinking it had something to with the throttle lift off.
Its the second time ive seen the EGT's this high and the first time was last year while on track but that was with another software in the ECU so it must be something else to blame.
Perhaps its time to check it up with a lambda meter.
During the accelleration EGT's was around 750 C but when I lift off the alarm light went off so I looked at the EGT and it was sky high. Peak recall revealed it had been up to 900 C. (measured after the turbo)
I thought fuel was dumped in upon throttle realease to prevent high EGT's so what could be the cause of it? Perhaps I just was lucky and released the throttle at the same time as it went sky high, therefor thinking it had something to with the throttle lift off.
Its the second time ive seen the EGT's this high and the first time was last year while on track but that was with another software in the ECU so it must be something else to blame.
Perhaps its time to check it up with a lambda meter.
10-09-2006, 04:28 PM
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It is a myth that an ecu pumps fuel in to cool cylinders. 
What better way of cooling a cylinder than to stop combustion !
More likely you have read a time delayed temperature as thermocouples
will have a delayed reading due to many factors mainly due to heating
up all the surrounding material before the sensor itself.
E.G, the sensor casing, mounting boss.
What better way of cooling a cylinder than to stop combustion !
More likely you have read a time delayed temperature as thermocouples
will have a delayed reading due to many factors mainly due to heating
up all the surrounding material before the sensor itself.
E.G, the sensor casing, mounting boss.
10-09-2006, 05:30 PM
#3
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Im using the thin egt probe its much faster than those stubby ones. But I guess its reaction time aint that quick either. Looks like something is wrong then.
10-09-2006, 05:37 PM
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I dont think there is a problem there.
Heat sensors no matter what type will always have a slow reaction time.
Unless you drive it hard on boost for a sustained period, you wont get a
true reflection of what is going on.
Unfortunately, you can melt an engine in 2 seconds.
An EGT probe, no matter how good doesnt protect against that.
Heat sensors no matter what type will always have a slow reaction time.
Unless you drive it hard on boost for a sustained period, you wont get a
true reflection of what is going on.
Unfortunately, you can melt an engine in 2 seconds.
An EGT probe, no matter how good doesnt protect against that.
10-09-2006, 05:58 PM
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Simon, ive had this EGT probe for five years and done several trackdays and high speed runs and never had this happend before so im just trying to figure what to check?
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10-09-2006, 09:26 PM
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Originally Posted by SECS
It is a myth that an ecu pumps fuel in to cool cylinders.
What better way of cooling a cylinder than to stop combustion !
What better way of cooling a cylinder than to stop combustion !
10-09-2006, 09:33 PM
#10
Originally Posted by Andreas
Will order a LM1 tomorrow, better safe than sorry.
10-09-2006, 10:37 PM
#15
Advanced PassionFord User
Originally Posted by Danny@RADesigns
sort of hijacking post here but anyone tell me boss size for a thin thermocouple and where to buy them?
Part no...254642
http://uk.farnell.com/jsp/search2/br...questid=313976
HTH
Ian
10-09-2006, 10:39 PM
#16
Originally Posted by sibster
Originally Posted by Danny@RADesigns
sort of hijacking post here but anyone tell me boss size for a thin thermocouple and where to buy them?
Part no...254642
http://uk.farnell.com/jsp/search2/br...questid=313976
HTH
Ian
11-09-2006, 02:01 PM
#18
DEYTUKURJERBS
Mine used to do this a lot, used to get cooler charge temps when gunning it than overrun in some cases.
Even more backward, if REALLY going for it the EGT was that high that letting off with the antilag going mental would drop charge temps slowly, lol.
Even more backward, if REALLY going for it the EGT was that high that letting off with the antilag going mental would drop charge temps slowly, lol.
11-09-2006, 02:08 PM
#19
Professional Waffler
Originally Posted by bud-weis
Originally Posted by SECS
It is a myth that an ecu pumps fuel in to cool cylinders.
What better way of cooling a cylinder than to stop combustion !
What better way of cooling a cylinder than to stop combustion !
11-09-2006, 02:09 PM
#20
Originally Posted by bud-weis
Originally Posted by SECS
It is a myth that an ecu pumps fuel in to cool cylinders.
What better way of cooling a cylinder than to stop combustion !
What better way of cooling a cylinder than to stop combustion !
11-09-2006, 02:23 PM
#21
Originally Posted by GARETH T
Originally Posted by bud-weis
Originally Posted by SECS
It is a myth that an ecu pumps fuel in to cool cylinders.
What better way of cooling a cylinder than to stop combustion !
What better way of cooling a cylinder than to stop combustion !
12-09-2006, 02:37 AM
#26
Professional Waffler
Originally Posted by B9KOS
Originally Posted by bud-weis
ok so it's not technically a liquid 
but over run fuel does help cool the cylinders!!
but over run fuel does help cool the cylinders!! Technically it is a liquid, just atomised
12-09-2006, 01:17 PM
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Originally Posted by Mike Rainbird
Andreas,
What you're seeing is not unusual. Mine often does this in certain conditions (like the ones you describe) and I have been told it is nothing to worry about....
What you're seeing is not unusual. Mine often does this in certain conditions (like the ones you describe) and I have been told it is nothing to worry about....
I better continue putting together that engine crane, I swear, its worse than the IKEA stuff.
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