Originally Posted by
Jim Galbally
the length of pipe will not affect the pressure measurement, as the pipe will eventially be filled to the same pressrue as the rest of the inlet. it will however take slightly longer to react to these pressreu changes.
i doubt and extra 1ft would make that much difference tho.
Jimbo, you cant quote "not affect" and "eventually be filled" in the same statement as its a total contradiction!
My understanding is that the sensor will work its best if the pipe is the proper length. Worth noting the standard pipe is also of solid plastic construction with rubber ends. I guess this is to stop and expansion issues. With all that in mind I am pretty sure a longer length of (I assume rubber) hose to the sensor could result in the ecu not reacting to pressure changes as quick as the MAP has been written for. (assuming its not been properly and fully re-mapped with the longer pipe).
I wont try to pretend I know about transient fueling and ignition but I believe its a function to cope with fast changes that sensors dont react quick enough too and maybe therefore affected by a MAP sensor pipe length?
Either shoot me down or give me a thumbs up someone who really knows!