GM mass airflow sensor

john spears speartec at iquest.net
Thu Jul 11 23:55:09 GMT 1996


I've seen several questions/comments about the output of GM MAF sensors. I
ran an airflow vs. frequency output today on the LT1 MAF that is used on the
high output aluminum head version (F and Y car) and also on the LT4 (Y car).
This is the largest diameter MAF sensor (3.5" O.D.) used on GM engines I
beleive, so it would support the most HP. The flow is in grams/second and
the output is in kilohertz.

         5gm/sec =  2 khz (idle)
        50gm/sec = 5.0khz
       100gm/sec = 6.7khz
       150gm/sec = 7.7khz
       200gm/sec = 8.5khz
       250gm/sec = 9.2khz
       300gm/sec = 9.7khz
       335gm/sec = 10 khz (max)

I hope that's of some value.

 John Spears




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