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  #1  
Old 06-10-2010, 10:51 PM
StarquestRescue StarquestRescue is offline
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Question Altitude changes and temp baro senders?

Some of the starquest guys are wondering how the base maft does with altitude changes. Like in Hawaii were a car can go up and down quite a bit from one side of the island to the other.

Also is there any advantage to using temp and baro senders in place of the fixed outputs?

Thanks
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Old 06-10-2010, 11:02 PM
TurboBob TurboBob is offline
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the standard speed density mode does a decent job of compensating for baro changes. There are some secondary effects of altitude, but they are pretty small.

The issue is on cars that have baro sensors that are still connected, and also running the Pro, because then you get double corrected, and the car will not run right over a large change in altitude.

Bob
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Old 06-10-2010, 11:15 PM
StarquestRescue StarquestRescue is offline
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These guys are running the base model 1g maft. The pro unit is way over there heads. I know that the gm type maf sensors do compensate some what for temp changes. Never the less some people do complain about tune drift with weather changes. Any way to minimize that?
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Old 06-11-2010, 01:35 AM
TurboBob TurboBob is offline
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The GM MAFs should properly compensate for altitude changes as they measure the mass of the air passing thru.

I have heard tales of weather sensitive tunes, but have never gotten real data on the subject.

The GM cars that use those MAFs have no baro compensation for the measured airflow. On the Buick GN's where we use them with a translator have no weather related tune shifts. So any weather sensitivity on other vehicles is really strange.

Bob
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