beaterX project thread

[scheides]

Well I think I've settled on 1.39*stock maf for about perfect scaling for my car and the 3.5" maf. Ironically:

area of circle: pi*r*r
inner diameter(stock): 2.8" (r=1.4)
inner diameter(primo): 3.3" (r=1.65)

area (stock) = 1.4*1.4*3.14 = 6.15 sq inches
area (primo) = 1.65*1.65*3.14 = 8.55 sq inches

conversion ratio (primo/stock): 8.55/6.15= 1.39

Others had told me 1.5 so I went with 1.48 to start....gah.

Anyways, been playing with boost. Goal is to peak to ~26psi and hold at least 25psi at 8000rpm. It's *not* perfect, but I'm getting there This is after about 3 revisions of testing.


(note: these pulls were started around 5000rpm, just for testing upper rpm boost...full pulls I will do when road conditions allow)

This is using my hybrid setup: hallman MBC inline with pierburg 3-port bcs. Seems to be working nicely

[Murlo26]

Originally Posted by scheides

Well I think I've settled on 1.39*stock maf for about perfect scaling for my car and the 3.5" maf. Ironically:

area of circle: pi*r*r
inner diameter(stock): 2.8" (r=1.4)
inner diameter(primo): 3.3" (r=1.65)

area (stock) = 1.4*1.4*3.14 = 6.15 sq inches
area (primo) = 1.65*1.65*3.14 = 8.55 sq inches

conversion ratio (primo/stock): 8.55/6.15= 1.39

Others had told me 1.5 so I went with 1.48 to start....gah.

Anyways, been playing with boost. Goal is to peak to ~26psi and hold at least 25psi at 8000rpm. It's *not* perfect, but I'm getting there This is after about 3 revisions of testing.


(note: these pulls were started around 5000rpm, just for testing upper rpm boost...full pulls I will do when road conditions allow)

This is using my hybrid setup: hallman MBC inline with pierburg 3-port bcs. Seems to be working nicely

So are you running the MBC from the 3 port to the wastegate? In an attempt to get more WGDC that way? Just trying to understand. I was considering doing that to try and hold some more boost after 7600rpms...or however I would need to set it up I guess, never got around to looking into it.