Increased EGT and AFR readings.
Discussion
Lawbags said:
I've started seeing EGT's between 6 and 700 recently (up from 4-500) and AFR's around 13 on normal driving, even on the motorway (up from 11-12)
I usually fill with 99RON fuel but was on empty and had to fill with 97.
Could this be the cause?
11-12 AFR's on cruise on the motorway is mega rich. I'd have been more concerned about that than them being in the 13's nowI usually fill with 99RON fuel but was on empty and had to fill with 97.
Could this be the cause?
At least now they're heading into more sensible territory, just a little more to go.
The very rich AFR's probably accounted for the cooler EGT's too.
stevieturbo said:
Lawbags said:
I've started seeing EGT's between 6 and 700 recently (up from 4-500) and AFR's around 13 on normal driving, even on the motorway (up from 11-12)
I usually fill with 99RON fuel but was on empty and had to fill with 97.
Could this be the cause?
11-12 AFR's on cruise on the motorway is mega rich. I'd have been more concerned about that than them being in the 13's nowI usually fill with 99RON fuel but was on empty and had to fill with 97.
Could this be the cause?
At least now they're heading into more sensible territory, just a little more to go.
The very rich AFR's probably accounted for the cooler EGT's too.
Max_Torque said:
What engine/ems?
Unlikely to be that much difference from the fuel in terms of Stoichometry.
More likely to be "Over enthusiastic" air or coolant temp corrections at the moment, what with all the hot weather we've been having.
Its a Honda D16. S0 1.6 single cam, 16v which has been fully built. Boosted, low comp pistons, uprated cam.Unlikely to be that much difference from the fuel in terms of Stoichometry.
More likely to be "Over enthusiastic" air or coolant temp corrections at the moment, what with all the hot weather we've been having.
Lawbags said:
What are sensible EGT's on normal driving? Or is it really engine dependent?
Depends where you are measuring. Depends whether n/a or turbocharged...again relating to sensor location.
Closer sensor is to the exhaust valve, the higher the reading.
Depends on engine tuning.
Depends on cam overlap too I'm sure
But one thing is for sure, there is no need to be running in the 11's or 12's off boost at normal driving/cruise areas. You need those areas of tuning mapped properly.
Other normal areas you say are 13's...could probably be leaner, but very application dependant. If economy isnt a concern, it maybe just drives and feels much nicer in that range than it does leaner
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