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Change in Alititude- Tune??

Crawlerdan
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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i moved from 500 foot to 3500 foot

ive noticed the legacy seems to get better gas milage, yay

but at 500 foot the motor draws 22lbs of vacuum at idle

at 3500 its only 18- this indicates it may be working a wee bit harder, or maybe running rich??

 

 

im not sure, i want it to run as good as possible, and return the best MPGS possible- is there anything the pros would recomend for a fairly substantial altitude change?

The ECU will compensate automatically. This POST on a related site will give you the details.

 

GL,

Td

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