mrf582 wrote:
A good starting point would be to take the stock MAF scaling for a 66mm ID MAF housing and multiply it by 1.26.
If you increase pipe diameter from 66mm. to 83mm. wouldn't the right multiplier be around 1.6?
Cross-sectional area of the MAF-Piping = Pi*r²
For 66mm:
3.14*33²= ~3420mm²
For 83mm
3.14*41.5²= ~5407mm²
Increase from 3420 to 5407 =~58% --> ~1.6 multiplier.
When I went bigger MAF housing (66->76mm) and injectors (Stock pinks 560->660) I played with these to see if the car would be driveable off boost without ecu tuning as I didn't have Openport cable that time.
Theory said it would be close enough, and it was
