[mwebb]

there will be slightly increased pressure on the throttle plate
IF
you install some kind of ducting to direct air into the "intake" under pressure
it will have absolutely NO effect on engine compression
it will have absolutely NO effect on fuel trim .

it may have a slight effect on engine MAP
which is Baro - intake vacuum

and a slight positive effect on suction throttling loss

the overall effect on FE should be a benefit , but it will not be a large benefit

Originally Posted by Mcgarry97geo

Just wondering if putting an air intake into a 97 4cyl metro would give me a boost in Mpg? Im not entirely sure if it would. Would the ecu try to over compensate for the extra oxgen going in. Or would it give my engine better compression. Therefore using less fuel.