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View Full Version : How much does the MAF heat the incoming air?

BBA
Aug-12-07, 06:35 AM
Answer: A lot!

I was flashing my PCM this morning, and did a scan before even starting the engine, IAT read 95º. Well, since my garage temperature was 88º and the truck was cold iron overnight, I pulled out the thermocouple. After verifying the garage temp was the same as the AC display said, I touched the engine block. It was 90º after sitting overnight. The MAF sensor housing was...you guessed it: 95º. Just from sitting with the key on engine off and cold, the MAF Sensor heated over 5º

At least I know the stock IAT really IS accurate. I don't think I'll get it any better than it is now and I am not about to screw things up with a relocated sensor lying to the engine about real intake temps.

Just thought this would be a tidbit of useful information to those who care...
Pladdpezzpunk
Aug-12-07, 07:05 PM
you forget to relize that the MAF sensor heats its coils and the housing. not the intake charge.
BBA
Aug-12-07, 07:17 PM
you forget to relize that the MAF sensor heats its coils and the housing. not the intake charge.

You forget to realize the screen IS the cooling device for the MAF sensor. It's designed to transfer the MAF sensors heat TO the incoming AIR so that it does not burn up and fall dead like a cripsy critter.
Skiba
Aug-13-07, 08:13 AM
:shakinghead:
pharmd
Aug-21-07, 04:16 PM
I dumb question but what is the diameter of the stock MAF?
LTZ03
Aug-21-07, 06:08 PM
the maf is just less than 90mm, unless you have ADM/LPE 100mm
gofish7
Sep-02-07, 07:07 PM
I think its like 86mm if I remember correctly.
HellBlazer
Sep-04-07, 10:04 PM
You forget to realize the screen IS the cooling device for the MAF sensor. It's designed to transfer the MAF sensors heat TO the incoming AIR so that it does not burn up and fall dead like a cripsy critter.

Wah???
Your both wrong. The MAF is nothing more than a thermistor. Its a heated resistor, and the ECM reads how many times it needs to send current to keep the resistor at like 500*F or somewhere in that range (Hz). Plastic does absorb heat pretty quickly- I have never checked, nor cared to check, but there is a possibility that the thermistor is heating up the MAF with the key on and power to the ECM