In dash data vs SCT

[redtrack]

A few months ago I found that IAT at the dash, to be 6F higher than ambient. This was read before starting the car a couple of mornings.
Then looking at datalogging in the SCT, coolant temp was also lower that head temp. and finally, my afr reads 11.6 when sct reads 12.5 ( .85Lambda)

It's our gauge mode in the track apps completly inacurate? I thought data came from the ECU.

Please tell me your findings....

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[kluke15]

from what ive read and seen it seems as this is totally normal and most if not everyone has experienced higher dash readings than reality. i personally notice when i start my car in the morning IAT and CHT are always higher than ambient. usually by about 5-10* for IAT and my CHT usually says like 90* when ambient is no higher than 60*

 

[Terminator2]

A few months ago I found that IAT at the dash, to be 6F higher than ambient. This was read before starting the car a couple of mornings.
Then looking at datalogging in the SCT, coolant temp was also lower that head temp. and finally, my afr reads 11.6 when sct reads 12.5 ( .85Lambda)

It's our gauge mode in the track apps completly inacurate? I thought data came from the ECU.

Please tell me your findings....

11.6 is correct in this case (actually closer to 12.0) as stoich is 14.08 not 14.69. CHT is normally 10* or so hotter the ECT. The IAT reading is off on all the 15-16 on the dash and also when I data log it with HP Tuners it's still off 6*.

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