sawtooth air temps from compressor

[Howard Coleman]

i monitor air temps between the turbo compressor and intercooler as well as after the throttle body. i use thermocouples so the temps are accurate and timely. response time 250 ms. accuracy =/- .4% of the reading.

i have noticed a sawtooth pattern on both my readings from the compressor and post throttle body.

both readings track each other as to peak/valley timing.

for instance:

out of compressor:

.037  327 F

.077  316 F

.106  331

 

post throttle body

.037  187 F

.077  175 F

.106  189 F

 

while the timing of both readings being the same as to peak and valley is interesting, my concern is the sawtooth pattern from the compressor. as boost and rpm builds it would seem the readings should be linearly higher rather than a fairly  consistant (rising) peak and valley.

my sensor is advertised as to generate 4 readings per second, yet it appears i am logging at a higher rate. 

is there an explanation for the cyclicality? somewhere between 10 and 16 F. 

looking through other parameters i see a bit of sawtooth in IDC, AFR, oil pressure, egts and engine speed.

i would welcome any thoughts and can post map/log if it would of help.

thank you. 

 

[Adamw]

Yeah give us the map and log.

[Howard Coleman]

https://drive.google.com/file/d/1ZCKrp-18Jb__egXzwCNfEuFsjZuEgR7C/view?usp=sharing

https://drive.google.com/file/d/1hyzSVCLei7eM1G2FtddJktzXZSWye00V/view?usp=sharing

 

[Howard Coleman]

another log from 6-11-2021 note AFR is sawtooth in addition to T out of compressor and IAT

https://drive.google.com/file/d/16wyqV05rLiACWxs_kDzxxyYYeRpipRZT/view?usp=share_link