I used the search feature to find an older posts about Map Sensors: https://www.thirdgen.org/forums/diy-...p-sensors.html

My question is: When a Map Sensor is correctly placed (hose nipple pointing down / positioned slightly higher than the intake plenum) onto the firewall, what is the maximum length the hose can be?

I'm retro fitting a TPI system into a Classic Chevy. I'm converting a MAS system to a MAP system using a 7727 ECM. The MAS upper plenum does not have a mounting position for the MAP sensor.

Thanks,
dave w

 

All info I have found, and seen myself indicates that until the hose is very long, longer than would ever be used in a car, that there will be no appreciable difference than if the MAP sensor was mounted to the intake directly.

The biggest thing to watch out for is to use a hose that will not collapse from the vacuum.

 

you can use a long hose/tube as six_shooter says. The best method would be to use hard line, whether plastic or metal, and make the interconnects rubber, so the overall length of soft collapsible material is short.

 

Braided stainless with AN fittings could add a lot of bling!

 

Thanks for the information. This information helps!

dave w