# my car is messed up

**URL:** <https://forums.speedlife.net/t/my-car-is-messed-up/11498>\
**Category:** NYSpeed Automotive\
**Created:** [May 1, 2006, 9:29am UTC](https://forums.speedlife.net/t/my-car-is-messed-up/11498 "2006-05-01T09:29:25Z")\
**Posts on this page:** 1\
**Showing post:** 39

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**Author:** ![Dr.Stevil](https://avatars.discourse-cdn.com/v4/letter/d/da6949/32.png) [@Dr.Stevil](https://forums.speedlife.net/u/Dr.Stevil)\
**Post date:** [May 2, 2006, 6:50am UTC](https://forums.speedlife.net/t/my-car-is-messed-up/11498/39 "2006-05-02T06:50:05Z")

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> [@Viper966](#):
>
> hate to say this
> 
> but having the maf before the TB is not a good idea… let me explain why
> 
> your MAF measures air flow… since the focus is a NA car the MAF assumes all air is at normal atmospheric pressure, and calculates its fueling based upon that
> 
> putting hte MAF in a pressured airstream will cause it to read a lower amount of air and thus a lower amount of oxygen then is actually present… thus presenting the car with a problem
> 
> i have never seen a turbo car put the maf after the turbo it is always before the turbo after the air filter
> 
> that way the air coming through the maf is at normal atmospheric pressure, and the car can read the true amount of air being taken in (all the air going into the turbo goes through the maf, thus all that same oxygen comes out and your car is much happier)
> 
> not only that but the MAF stays clean and away from the exess heat of compressed air that is probably killing it

Actually… that makes alot of sense

although it doesnt seem right that it was running good before all this though

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