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delcowizzid wrote:so 255g/sec is 450 cfm maybe i need a couple of mafs one for small stuff and a vs/ls maf for flowing big stuff like mufflers

A card MAF is pretty scalable in terms of flow range by just using a bigger pipe, providing you do not get any turbulence. But you need a way to calibrate it to know what the measured frequency means in terms of air mass. The other part is calculating the air flow from your air mass reading, might need a MAP and temperature sensor as well.

Watch out for vacuum in the pipe though, have heard this can mess up some MAF readings.

correct me if im wrong here but isnt it like a dyno? its less about exact numbers and more about repeatable results and getting the biggest number from your measuring device. knowing exact values is good for bragging rights tho, but if you set it to the same pressure reading on your map sensor for each test then it should be farily repeatable?

the card maf's in the enhanced section goto 15 - 16khz if you download the excel sheet for MAF there is a graph on the second page which will show the linear flow upto 512g/s which is the MAF tables used in Enhanced, prob not 100% accurate but it is linear past the factory point to 512

Jayme wrote:correct me if im wrong here but isnt it like a dyno? its less about exact numbers and more about repeatable results and getting the biggest number from your measuring device. knowing exact values is good for bragging rights tho, but if you set it to the same pressure reading on your map sensor for each test then it should be farily repeatable?

yes id be flowing stock heads to set as a baseline, then you can measure improvement from there.

yeah ill be using 1 or more vacuam cleaners and just using a ball valve or similar to adjust the vacuam as i open the valves to keep the same vacuam over all lifts.i dont really need it to be accurate but repeatable.i can get a vane type maf like vk had 0-5v and it can be opened and loosened up to allow varying calibration but would have no real world data figures without going to the local flow bench and getting it baselined .a vs maf i could just drop it in and work out gs/sec to cfm roughly and be in the ballpark.i plan to flow anything turbo housings complete exhaust systems front to back and heads manifolds TB's etc ill flow anything lol.i even have a v6 head on the bench ready to go with some pretty radicle porting and unshrouded valves i want to test for flow gains and swirl hell ill even flow my intercooler

hoover or vax?

electrolux gotta be lux LOL.a lot of the diy flowbench guys run a bank of motors in a box connected remotely via a pipe to get enough depression

would perhaps a pair of 240v blower motors work ok? should shift quite a lot of air and a hell of lot quiter

I was involved with a flow bench a few years ago and we started out with a vacuum cleaner then 2 and ended up with a big 3 phase air pump to do the job. The engines were Chevy and Holden.

so got my first 2 vacuam cleaners. preliminary setup for a bit of messing round below note to self with all safety features built into a vacum cleaner removed "DO NOT" put youre hand over the end of it LOL.late model vacuams make it awesome electronic speed control and slow start feature built in on full can get the intake ports howling at lower lifts