throttle before or after turbo

[Gary Derian]

This won't work.  A MAP sensor works as an EFI input because that is what
the engine sees.  If you put a turbo in between, the MAP no longer tells the
EFI what the engine sees.  Maybe a MAP and throttle angle combo would
indicate air flow but why reinvent the wheel, use a 2 bar MAP.

Gary Derian <gderian at cybergate.net>


>Would a set up like this work on an NA efi engine?
> Throttle body
> NA MAP sensor
> turbo
> intercooler
> intake runners
>port fuel injection
> aftermarket rising rate fuel pressure regulator
>Stock ECU
>  I've been toying with the idea for quite some time , but havent had the
>opportunity to try it out yet.  It seems to me that by putting the NA MAP
>sensor between the turbo & TB will enable it to always read vacuum only &
>there would be no need to change the MAP sensor or ECU to one that is
>capable or accomodating boost readings.  My question is aside from the oil
>being sucked out thru the oil seals, are there any other problems ?
>And will the vacuum produced in a such a way be out of range of the NA MAP
>sensor?  How about the rising rate fuel regulator? Will it operate without
>any problems in a setup like this?