Engine/Transmission (1998.5 - 2002) IAT - stay tuned

[lizzyhermit]

after reading in other forums of Input Air Temperatures (IAT) affecting performace and EGT's I thought I'd experiment and publish some observations.



after two days of 100+ desert temps the probe at the OEM air horn is 3 to 18 degress above ambient due to engine and sunshine heating up the fender. at morning startup just after starting the truck I saw the 3* diff. and 18 was just now after driving 3 mi's in 97* heat for lunch.



city cruising on the freeway has been 6 - 8 degress above ambient.



stay tuned: this evening the probe goes to where all are mounting the BHAF's.

 

[DavidC]

If you are interested and have a laptop you could use Alex Pepers OBD-2 software. Turn it on, plug the laptop in to the port and see the IAT readings and a lot more. The good part of this is that you can save the files. That way if you make mods you can compare before and after files.



Dave

 

[lizzyhermit]

part two

the probe between the OEM filter box and the firewall (where a BHAF would sit) reads 8 - 42 degrees above ambient. the 42* is while idling but when moving the temp comes down and maintains about 18* above ambient. .



not rocket science, just info. 'course when the ambient is triple digits everything is hot...



davidc, thanks for the tip on the laptop software and I may snoop around a bit. this temp. experiemnt was just looking for a cooler input air source.



I may fashion a scoop to gather more front end air into the OEM box in place of a BHAF. I think I've read that the OEM box provides sufficient air flow for a basically stock truck...

 

[plongson]

How Often???

Speaking of IAT's... With an exhaust brake, how often are you guys cleaning the sensor. I understand that they carbon-up faster with an EB