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Old 04-20-2012, 12:15 AM   #857
dub c
Scooby Specialist
Member#: 145069
Join Date: Apr 2007
Chapter/Region: W. Canada
Location: Calgary, Alberta
Keep It Sleazy


Question regarding IAT sensor and methanol jet placement...

-I have heard some conflicting information, the way I see it is the IAT sensor should be placed as close to the head as possible or at least midway through the runner (so heat from the valves isn't transferred), and the methanol near/before the throttle body.
So the cooler air charge going into the engine is measured by the IAT.

Contradictory information:
-In a MAF based system the airflow in doesn't change when the meth is spraying, the charge temp is just lower and the burn speed is slowed but the mani. pressure did not change with the methanol injection.
-In a SD system, if there is a significant drop in IAT, the IAT sensor will trigger the ECU to add more fuel when in fact the airflow into the engine isn't changing causing the car to run rich.


Hope I made sense.
Thanks in advance.
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