Right, so the m106 system is in the process of getting squeezed in to the e30 bay, and I'm limited in the available space for an air filter. After searching through K&Ns database of universal filters I believe I've found one that will fit, p/n SN-2620. This filter is rated at 396 CFM (cubic feet per minute), which is on the low side for most automotive applications. Given that a normally stock m30 would have a VE of approximately 80% (.80), that leads me to a CFM rate of about:
214 cubic inches * 6500rpm * 0.80VE = 342 CFM
3456
However turbo engines have higher VEs than NA engines, and therefor I need a different VE number for the m106 setup. Without the ability to scan an OBD2 system for things like fuel flow rate or MAP, I don't have the standard inputs I would need to calculate VE from scratch.
Can anyone with more turbo building experience help me estimate the VE on a setup like this? Or does anyone happen to know the VE of the m106 motor? It doesn't have to be exact, but the difference between a VE of 1.2 and 1.6 would be significant.
214 cubic inches * 6500rpm * 0.80VE = 342 CFM
3456
However turbo engines have higher VEs than NA engines, and therefor I need a different VE number for the m106 setup. Without the ability to scan an OBD2 system for things like fuel flow rate or MAP, I don't have the standard inputs I would need to calculate VE from scratch.
Can anyone with more turbo building experience help me estimate the VE on a setup like this? Or does anyone happen to know the VE of the m106 motor? It doesn't have to be exact, but the difference between a VE of 1.2 and 1.6 would be significant.
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