a mass air flow (MAF) sensor and manifold absolute pressure (MAP) sensor are two different ways of feeding fuel to an engine. some cars use a MAF and some cars use a MAP, but i get the impression a MAP system is preferred for turbo use. can anyone explain why?
here's some comments from the SDS standalone computer site:
http://www.sdsefi.com/tech.html#FAQ
Q. What is a MAP sensor and why are there 3 different ones?
A. A MAP sensor senses the pressure in the intake manifold. When combined with rpm information, it allows the ECU to compute airflow and supply the correct pulse width to the injectors.
We sell 3 different MAP sensors to cover engine applications with different boost levels.
The 1 Bar sensor is for naturally aspirated engines.
The 2 Bar sensor is for engines running up to 15 psi boost.
The 3 Bar sensor is for engines running up to 30 psi boost.
Map sensors are referenced to an absolute vacuum internally so they compensate for altitude and barometric changes automatically. MAP sensors simply connect to your intake manifold with a length of vacuum hose.
Q. Can SDS use an airflow meter?
A. No. Since SDS is fully programmable and designed to work on almost any engine, we decided to use the speed/density method of load sensing. Installation of airflow meters on many vehicles, especially turbocharged ones, is often awkward because of their size. Airflow meters also represent a flow restriction which is not conducive to making hp on performance applications.
any supporting/contrary comments? thx.
here's some comments from the SDS standalone computer site:
http://www.sdsefi.com/tech.html#FAQ
Q. What is a MAP sensor and why are there 3 different ones?
A. A MAP sensor senses the pressure in the intake manifold. When combined with rpm information, it allows the ECU to compute airflow and supply the correct pulse width to the injectors.
We sell 3 different MAP sensors to cover engine applications with different boost levels.
The 1 Bar sensor is for naturally aspirated engines.
The 2 Bar sensor is for engines running up to 15 psi boost.
The 3 Bar sensor is for engines running up to 30 psi boost.
Map sensors are referenced to an absolute vacuum internally so they compensate for altitude and barometric changes automatically. MAP sensors simply connect to your intake manifold with a length of vacuum hose.
Q. Can SDS use an airflow meter?
A. No. Since SDS is fully programmable and designed to work on almost any engine, we decided to use the speed/density method of load sensing. Installation of airflow meters on many vehicles, especially turbocharged ones, is often awkward because of their size. Airflow meters also represent a flow restriction which is not conducive to making hp on performance applications.
any supporting/contrary comments? thx.