Maf sensor and housing questions

[kingkhalilz]

I have read lots of threads regarding this and sadly i think im still confused. Tell me im wrong and why.
To my understanding our stock maf sensor and housing it sits in can only read up to a certain amount of grams/second of air. Big turbo requires more air than this. It reads up to 22 psi of boost on a stock car depending on the elevation. Is this just a solid estimate of how much mass flow rate the sensor can read on stock set ups. To my understanding turbo's flow very differently, and if the maf sensor reads the mass flow rate the total amount of psi the maf can read should differ from turbo to turbo.
With that being said, another way to go about this is increasing the cross sectional area of the housing the maf sits in. Then scaling the ecu to that size housing and a higher mas flow rate can know be evaluated. Is this even slightly correct?

With that being said how big of a housing would one need would a different maf be necessary for a k24 build with 2.8 heads 1000cc ev14's this junk.

[Dorny1]

85mm housing with the proper tune will be good for even GT turbos, bigger than that I'm unsure. dont know why you're doing 2.8 heads or 1000cc injectors for a franken turbo setup...

[kingkhalilz]

srm k24. So the stock maf is fine. Just need an 85mm housing and scale to that?

[Quattro_The_Dog]

You are getting the map and maf sensor confused. Map sensor has a hard limit. Maf sensor is limited by the housing size itself. The sensor has no real limit other than 5 volts and that could be huge power (air flow) in a huge housing or a little bit in a little housing.

[kingkhalilz]

I see map sensor is hard limited to a certain pressure. That makes more sense. To tune on n75 a new map sensor is needed or can it be scaled?

[jballou]

Just run an RS4 Airbox and an RS4 MAF and call it a day. Stop messing around with all the bull-larky that goes around on this forum.

[zillarob]

I see map sensor is hard limited to a certain pressure. That makes more sense. To tune on n75 a new map sensor is needed or can it be scaled?

Google "5120 hack" for info on upping the map limit.

[ilyafil]

Just run an RS4 Airbox and an RS4 MAF and call it a day. Stop messing around with all the bull-larky that goes around on this forum.

This!

[FlyboyS4]

With that being said how big of a housing would one need would a different maf be necessary for a k24 build with 2.8 heads 1000cc ev14's this junk.

You could use a stock MAF housing, if you are willing to limit boost, if you plan on building the engine with rods and pushing close to 30 psi then an 85mm housing and Hitachi sensor may be too small.

Just run an RS4 Airbox and an RS4 MAF and call it a day. Stop messing around with all the bull-larky that goes around on this forum.

If you can do this ^ it should have you covered.

[Mocke]

Just run an RS4 Airbox and an RS4 MAF and call it a day. Stop messing around with all the bull-larky that goes around on this forum.

+1. There is no reason for you to run anything than oem rs4 maf. Mapsensor on the other hand needs to be upgraded to at least 3bar. That is to be able to Control boost properly when tuning.

[kingkhalilz]

rs4 maf and housing it is plus a 3bar map sensor or greater with the 5120 hack will take car of that, i would still have to correct the area of the housing for the rs4 sensor and housing? or is the rs4 maf and housing combo need not be addressed?

[FlyboyS4]

i would still have to correct the area of the housing for the rs4 sensor and housing? or is the rs4 maf and housing combo need not be addressed?

You'll need to revise the appropriate tables to account for the RS4 sensor and housing, but if you're doing the 5120 hack you'll have a lot of experience with altering data tables by the time you need to adjust for the different MAF.

[kingkhalilz]

Cool, will be ordering all my parts soon so wanted to get this stuff squared away. I have put aside tons of time for tuning. Thats going to be a fun one to learn!